+++ /dev/null
-/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
-/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
-
-/**
- * Maximum file size of the font.
- */
-var kMaxFontFileSize = 40000;
-
-/**
- * Maximum number of glyphs per font.
-*/
-var kMaxGlyphsCount = 65526;
-
-/**
- * Maximum time to wait for a font to be loaded by @font-face
- */
-var kMaxWaitForFontFace = 1000;
-
-/**
- * Useful for debugging when you want to certains operations depending on how
- * many fonts are loaded.
- */
-var fontCount = 0;
-
-/**
- * Hold a map of decoded fonts and of the standard fourteen Type1 fonts and
- * their acronyms.
- * TODO Add the standard fourteen Type1 fonts list by default
- * http://cgit.freedesktop.org/poppler/poppler/tree/poppler/GfxFont.cc#n65
- */
-var Fonts = {
- _active: null,
- get active() {
- return this._active || { encoding: [] };
- },
-
- set active(aName) {
- this._active = this[aName];
- },
-
- unicodeFromCode: function fonts_unicodeFromCode(aCode) {
- var unicode = GlyphsUnicode[this.active.encoding[aCode]];
- return unicode ? "0x" + unicode : aCode;
- }
-};
-
-/**
- * 'Font' is the class the outside world should use, it encapsulate all the font
- * decoding logics whatever type it is (assuming the font type is supported).
- *
- * For example to read a Type1 font and to attach it to the document:
- * var type1Font = new Font("MyFontName", binaryData, aFontEncoding, "Type1");
- * type1Font.bind();
- *
- * As an improvment the last parameter can be replaced by an automatic guess
- * of the font type based on the first byte of the file.
- *
- * FIXME There is now too many parameters, this should be turned into an
- * object containing all the required informations about the font
- */
-var Font = function(aName, aFile, aEncoding, aCharset, aBBox, aType) {
- this.name = aName;
-
- // If the font has already been decoded simply return
- if (Fonts[aName]) {
- this.font = Fonts[aName].data;
- return;
- }
- fontCount++;
-
- var start = Date.now();
- switch (aType) {
- case "Type1":
- var cff = new CFF(aName, aBBox, aFile);
- this.mimetype = "font/otf";
-
- // Wrap the CFF data inside an OTF font file
- this.font = this.cover(cff);
- break;
-
- case "TrueType":
- return Fonts[aName] = {
- data: null,
- encoding: {},
- charset: null,
- loading: false
- };
-
- // TrueType is disabled for the moment since the sanitizer prevent it
- // from loading
- this.mimetype = "font/ttf";
- var ttf = new TrueType(aFile);
- this.font = ttf.data;
- break;
-
- default:
- warn("Font " + aType + " is not supported");
- break;
- }
- var end = Date.now();
-
- Fonts[aName] = {
- data: this.font,
- encoding: aEncoding,
- charset: aCharset ? aCharset.slice() : null,
- loading: true
- }
-
- // Attach the font to the document
- this.bind();
-};
-
-
-/**
- * A bunch of the OpenType code is duplicate between this class and the
- * TrueType code, this is intentional and will merge in a future version
- * where all the code relative to OpenType will probably have its own
- * class and will take decision without the Fonts consent.
- * But at the moment it allows to develop around the TrueType rewriting
- * on the fly without messing up with the 'regular' Type1 to OTF conversion.
- */
-Font.prototype = {
- name: null,
- font: null,
- mimetype: null,
-
- bind: function font_bind() {
- var data = this.font;
-
- // Compute the binary data to base 64
- var str = [];
- var count = data.length;
- for (var i = 0; i < count; i++)
- str.push(data.getChar ? data.getChar()
- : String.fromCharCode(data[i]));
-
- var dataBase64 = window.btoa(str.join(""));
- var fontName = this.name;
-
- /** Hack begin */
-
- // Actually there is not event when a font has finished downloading so
- // the following tons of code are a dirty hack to 'guess' when a font is
- // ready
- var debug = false;
-
- if (debug) {
- var name = document.createElement("font");
- name.setAttribute("style", "position: absolute; left: 20px; top: " +
- (100 * fontCount + 60) + "px");
- name.innerHTML = fontName;
- document.body.appendChild(name);
- }
-
- var canvas = document.createElement("canvas");
- var style = "border: 1px solid black; position:absolute; top: " +
- (debug ? (100 * fontCount) : "-200") + "px; left: 2px; width: 340px; height: 100px";
- canvas.setAttribute("style", style);
- canvas.setAttribute("width", 340);
- canvas.setAttribute("heigth", 100);
- document.body.appendChild(canvas);
-
- // Retrieve font charset
- var charset = Fonts[fontName].charset || [];
- // if the charset is too small make it repeat a few times
- var count = 30;
- while (count-- && charset.length <= 30)
- charset = charset.concat(charset.slice());
-
- // Get the font size canvas think it will be for 'spaces'
- var ctx = canvas.getContext("2d");
- var testString = " ";
-
- // When debugging use the characters provided by the charsets to visually
- // see what's happening
- if (debug) {
- for (var i = 0; i < charset.length; i++) {
- var unicode = new Number("0x" + GlyphsUnicode[charset[i]]);
- if (!unicode)
- error("Unicode for " + charset[i] + " is has not been found in the glyphs list");
- testString += String.fromCharCode(unicode);
- }
- }
- ctx.font = "bold italic 20px " + fontName + ", Symbol, Arial";
- var textWidth = ctx.mozMeasureText(testString);
-
- if (debug)
- ctx.fillText(testString, 20, 20);
-
- var start = Date.now();
- var interval = window.setInterval(function canvasInterval(self) {
- ctx.font = "bold italic 20px " + fontName + ", Symbol, Arial";
-
- // For some reasons the font has not loaded, so mark it loaded for the
- // page to proceed but cry
- if ((Date.now() - start) >= kMaxWaitForFontFace) {
- window.clearInterval(interval);
- Fonts[fontName].loading = false;
- warn("Is " + fontName + " for charset: " + charset + " loaded?");
- } else if (textWidth != ctx.mozMeasureText(testString)) {
- window.clearInterval(interval);
- Fonts[fontName].loading = false;
- }
-
- if (debug)
- ctx.fillText(testString, 20, 50);
- }, 20, this);
-
- /** Hack end */
-
- // Add the @font-face rule to the document
- var url = "url(data:" + this.mimetype + ";base64," + dataBase64 + ");";
- var rule = "@font-face { font-family:'" + fontName + "';src:" + url + "}";
- var styleSheet = document.styleSheets[0];
- styleSheet.insertRule(rule, styleSheet.length);
- },
-
- _createOpenTypeHeader: function font_createOpenTypeHeader(aFile, aOffsets, aNumTables) {
- // sfnt version (4 bytes)
- var version = [0x4F, 0x54, 0x54, 0X4F];
-
- // numTables (2 bytes)
- var numTables = aNumTables;
-
- // searchRange (2 bytes)
- var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
- var searchRange = tablesMaxPower2 * 16;
-
- // entrySelector (2 bytes)
- var entrySelector = Math.log(tablesMaxPower2) / Math.log(2);
-
- // rangeShift (2 bytes)
- var rangeShift = numTables * 16 - searchRange;
-
- var header = [].concat(version,
- FontsUtils.integerToBytes(numTables, 2),
- FontsUtils.integerToBytes(searchRange, 2),
- FontsUtils.integerToBytes(entrySelector, 2),
- FontsUtils.integerToBytes(rangeShift, 2));
- aFile.set(header, aOffsets.currentOffset);
- aOffsets.currentOffset += header.length;
- aOffsets.virtualOffset += header.length;
- },
-
- _createTableEntry: function font_createTableEntry(aFile, aOffsets, aTag, aData) {
- // tag
- var tag = [
- aTag.charCodeAt(0),
- aTag.charCodeAt(1),
- aTag.charCodeAt(2),
- aTag.charCodeAt(3)
- ];
-
- // offset
- var offset = aOffsets.virtualOffset;
-
- // Per spec tables must be 4-bytes align so add some 0x00 if needed
- while (aData.length & 3)
- aData.push(0x00);
-
- // length
- var length = aData.length;
-
- // checksum
- var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
-
- var tableEntry = [].concat(tag,
- FontsUtils.integerToBytes(checksum, 4),
- FontsUtils.integerToBytes(offset, 4),
- FontsUtils.integerToBytes(length, 4));
- aFile.set(tableEntry, aOffsets.currentOffset);
- aOffsets.currentOffset += tableEntry.length;
- aOffsets.virtualOffset += aData.length;
- },
-
- _createCMAPTable: function font_createCMAPTable(aGlyphs) {
- var characters = new Uint16Array(kMaxGlyphsCount);
- for (var i = 0; i < aGlyphs.length; i++)
- characters[aGlyphs[i].unicode] = i + 1;
-
- // Separate the glyphs into continuous range of codes, aka segment.
- var ranges = [];
- var range = [];
- var count = characters.length;
- for (var i = 0; i < count; i++) {
- if (characters[i]) {
- range.push(i);
- } else if (range.length) {
- ranges.push(range.slice());
- range = [];
- }
- }
-
- // The size in bytes of the header is equal to the size of the
- // different fields * length of a short + (size of the 4 parallels arrays
- // describing segments * length of a short).
- var headerSize = (12 * 2 + (ranges.length * 4 * 2));
-
- var segCount = ranges.length + 1;
- var segCount2 = segCount * 2;
- var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
- var searchEntry = Math.log(segCount) / Math.log(2);
- var rangeShift = 2 * segCount - searchRange;
- var cmap = [].concat(
- [
- 0x00, 0x00, // version
- 0x00, 0x01, // numTables
- 0x00, 0x03, // platformID
- 0x00, 0x01, // encodingID
- 0x00, 0x00, 0x00, 0x0C, // start of the table record
- 0x00, 0x04 // format
- ],
- FontsUtils.integerToBytes(headerSize, 2), // length
- [0x00, 0x00], // language
- FontsUtils.integerToBytes(segCount2, 2),
- FontsUtils.integerToBytes(searchRange, 2),
- FontsUtils.integerToBytes(searchEntry, 2),
- FontsUtils.integerToBytes(rangeShift, 2)
- );
-
- // Fill up the 4 parallel arrays describing the segments.
- var startCount = [];
- var endCount = [];
- var idDeltas = [];
- var idRangeOffsets = [];
- var glyphsIdsArray = [];
- var bias = 0;
- for (var i = 0; i < segCount - 1; i++) {
- var range = ranges[i];
- var start = FontsUtils.integerToBytes(range[0], 2);
- var end = FontsUtils.integerToBytes(range[range.length - 1], 2);
-
- var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2);
- bias += range.length;
-
- // deltas are signed shorts
- delta[0] ^= 0xFF;
- delta[1] ^= 0xFF;
- delta[1] += 1;
-
- startCount.push(start[0], start[1]);
- endCount.push(end[0], end[1]);
- idDeltas.push(delta[0], delta[1]);
- idRangeOffsets.push(0x00, 0x00);
-
- for (var j = 0; j < range.length; j++)
- glyphsIdsArray.push(range[j]);
- }
- startCount.push(0xFF, 0xFF);
- endCount.push(0xFF, 0xFF);
- idDeltas.push(0x00, 0x01);
- idRangeOffsets.push(0x00, 0x00);
-
- return cmap.concat(endCount, [0x00, 0x00], startCount,
- idDeltas, idRangeOffsets, glyphsIdsArray);
- },
-
- cover: function font_cover(aFont) {
- var otf = new Uint8Array(kMaxFontFileSize);
-
- // Required Tables
- var CFF = aFont.data, // PostScript Font Program
- OS2 = [], // OS/2 and Windows Specific metrics
- cmap = [], // Character to glyphs mapping
- head = [], // Font eader
- hhea = [], // Horizontal header
- hmtx = [], // Horizontal metrics
- maxp = [], // Maximum profile
- name = [], // Naming tables
- post = []; // PostScript informations
- var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
-
- // The offsets object holds at the same time a representation of where
- // to write the table entry information about a table and another offset
- // representing the offset where to draw the actual data of a particular
- // table
- var offsets = {
- currentOffset: 0,
- virtualOffset: tables.length * (4 * 4)
- };
-
- // For files with only one font the offset table is the first thing of the
- // file
- this._createOpenTypeHeader(otf, offsets, tables.length);
-
- // XXX It is probable that in a future we want to get rid of this glue
- // between the CFF and the OTF format in order to be able to embed TrueType
- // data.
- this._createTableEntry(otf, offsets, "CFF ", CFF);
-
- /** OS/2 */
- OS2 = [
- 0x00, 0x03, // version
- 0x02, 0x24, // xAvgCharWidth
- 0x01, 0xF4, // usWeightClass
- 0x00, 0x05, // usWidthClass
- 0x00, 0x00, // fstype
- 0x02, 0x8A, // ySubscriptXSize
- 0x02, 0xBB, // ySubscriptYSize
- 0x00, 0x00, // ySubscriptXOffset
- 0x00, 0x8C, // ySubscriptYOffset
- 0x02, 0x8A, // ySuperScriptXSize
- 0x02, 0xBB, // ySuperScriptYSize
- 0x00, 0x00, // ySuperScriptXOffset
- 0x01, 0xDF, // ySuperScriptYOffset
- 0x00, 0x31, // yStrikeOutSize
- 0x01, 0x02, // yStrikeOutPosition
- 0x00, 0x00, // sFamilyClass
- 0x02, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Panose
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 0-31)
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 32-63)
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 64-95)
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 96-127)
- 0x2A, 0x32, 0x31, 0x2A, // achVendID
- 0x00, 0x20, // fsSelection
- 0x00, 0x2D, // usFirstCharIndex
- 0x00, 0x7A, // usLastCharIndex
- 0x00, 0x03, // sTypoAscender
- 0x00, 0x20, // sTypeDescender
- 0x00, 0x38, // sTypoLineGap
- 0x00, 0x5A, // usWinAscent
- 0x02, 0xB4, // usWinDescent
- 0x00, 0xCE, 0x00, 0x00, // ulCodePageRange1 (Bits 0-31)
- 0x00, 0x01, 0x00, 0x00, // ulCodePageRange2 (Bits 32-63)
- 0x00, 0x00, // sxHeight
- 0x00, 0x00, // sCapHeight
- 0x00, 0x01, // usDefaultChar
- 0x00, 0xCD, // usBreakChar
- 0x00, 0x02 // usMaxContext
- ];
- this._createTableEntry(otf, offsets, "OS/2", OS2);
-
- //XXX Getting charstrings here seems wrong since this is another CFF glue
- var charstrings = aFont.getOrderedCharStrings(aFont.glyphs);
-
- /** CMAP */
- cmap = this._createCMAPTable(charstrings);
- this._createTableEntry(otf, offsets, "cmap", cmap);
-
- /** HEAD */
- head = [
- 0x00, 0x01, 0x00, 0x00, // Version number
- 0x00, 0x00, 0x50, 0x00, // fontRevision
- 0x00, 0x00, 0x00, 0x00, // checksumAdjustement
- 0x5F, 0x0F, 0x3C, 0xF5, // magicNumber
- 0x00, 0x00, // Flags
- 0x03, 0xE8, // unitsPerEM (defaulting to 1000)
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // creation date
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // modifification date
- 0x00, 0x00, // xMin
- 0x00, 0x00, // yMin
- 0x00, 0x00, // xMax
- 0x00, 0x00, // yMax
- 0x00, 0x00, // macStyle
- 0x00, 0x00, // lowestRecPPEM
- 0x00, 0x00, // fontDirectionHint
- 0x00, 0x00, // indexToLocFormat
- 0x00, 0x00 // glyphDataFormat
- ];
- this._createTableEntry(otf, offsets, "head", head);
-
- /** HHEA */
- hhea = [].concat(
- [
- 0x00, 0x01, 0x00, 0x00, // Version number
- 0x00, 0x00, // Typographic Ascent
- 0x00, 0x00, // Typographic Descent
- 0x00, 0x00, // Line Gap
- 0xFF, 0xFF, // advanceWidthMax
- 0x00, 0x00, // minLeftSidebearing
- 0x00, 0x00, // minRightSidebearing
- 0x00, 0x00, // xMaxExtent
- 0x00, 0x00, // caretSlopeRise
- 0x00, 0x00, // caretSlopeRun
- 0x00, 0x00, // caretOffset
- 0x00, 0x00, // -reserved-
- 0x00, 0x00, // -reserved-
- 0x00, 0x00, // -reserved-
- 0x00, 0x00, // -reserved-
- 0x00, 0x00 // metricDataFormat
- ],
- FontsUtils.integerToBytes(charstrings.length, 2) // numberOfHMetrics
- );
- this._createTableEntry(otf, offsets, "hhea", hhea);
-
- /** HMTX */
- hmtx = [0x01, 0xF4, 0x00, 0x00];
- for (var i = 0; i < charstrings.length; i++) {
- var charstring = charstrings[i].charstring;
- var width = FontsUtils.integerToBytes(charstring[1], 2);
- var lsb = FontsUtils.integerToBytes(charstring[0], 2);
- hmtx = hmtx.concat(width, lsb);
- }
- this._createTableEntry(otf, offsets, "hmtx", hmtx);
-
- /** MAXP */
- maxp = [].concat(
- [
- 0x00, 0x00, 0x50, 0x00, // Version number
- ],
- FontsUtils.integerToBytes(charstrings.length + 1, 2) // Num of glyphs (+1 to pass the sanitizer...)
- );
- this._createTableEntry(otf, offsets, "maxp", maxp);
-
- /** NAME */
- name = [
- 0x00, 0x00, // format
- 0x00, 0x00, // Number of names Record
- 0x00, 0x00 // Storage
- ];
- this._createTableEntry(otf, offsets, "name", name);
-
- /** POST */
- // FIXME Get those informations from the FontInfo structure
- post = [
- 0x00, 0x03, 0x00, 0x00, // Version number
- 0x00, 0x00, 0x01, 0x00, // italicAngle
- 0x00, 0x00, // underlinePosition
- 0x00, 0x00, // underlineThickness
- 0x00, 0x00, 0x00, 0x00, // isFixedPitch
- 0x00, 0x00, 0x00, 0x00, // minMemType42
- 0x00, 0x00, 0x00, 0x00, // maxMemType42
- 0x00, 0x00, 0x00, 0x00, // minMemType1
- 0x00, 0x00, 0x00, 0x00 // maxMemType1
- ];
- this._createTableEntry(otf, offsets, "post", post);
-
- // Once all the table entries header are written, dump the data!
- var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
- for (var i = 0; i < tables.length; i++) {
- var table = tables[i];
- otf.set(table, offsets.currentOffset);
- offsets.currentOffset += table.length;
- }
-
- var fontData = [];
- for (var i = 0; i < offsets.currentOffset; i++)
- fontData.push(otf[i]);
- return fontData;
- }
-};
-
-
-/**
- * FontsUtils is a static class dedicated to hold codes that are not related
- * to fonts in particular and needs to be share between them.
- */
-var FontsUtils = {
- _bytesArray: new Uint8Array(4),
- integerToBytes: function fu_integerToBytes(aValue, aBytesCount) {
- var bytes = this._bytesArray;
-
- if (aBytesCount == 1) {
- bytes.set([aValue]);
- return bytes[0];
- } else if (aBytesCount == 2) {
- bytes.set([aValue >> 8, aValue]);
- return [bytes[0], bytes[1]];
- } else if (aBytesCount == 4) {
- bytes.set([aValue >> 24, aValue >> 16, aValue >> 8, aValue]);
- return [bytes[0], bytes[1], bytes[2], bytes[3]];
- }
- },
-
- bytesToInteger: function fu_bytesToInteger(aBytesArray) {
- var value = 0;
- for (var i = 0; i < aBytesArray.length; i++)
- value = (value << 8) + aBytesArray[i];
- return value;
- },
-
- getMaxPower2: function fu_getMaxPower2(aNumber) {
- var maxPower = 0;
- var value = aNumber;
- while (value >= 2) {
- value /= 2;
- maxPower++;
- }
-
- value = 2;
- for (var i = 1; i < maxPower; i++)
- value *= 2;
- return value;
- }
-};
-
-
-/**
- * The TrueType class verify that the ttf embedded inside the PDF is correct in
- * the point of view of the OTS sanitizer and rewrite it on the fly otherwise.
- *
- * At the moment the rewiting only support rewriting missing 'OS/2' table.
- * This class is unused at the moment since the 'cmap' table of the test
- * document is not missing but use and old version of the 'cmap' table that
- * is deprecated and not supported by the sanitizer...
- *
- */
-var TrueType = function(aFile) {
- var header = this._readOpenTypeHeader(aFile);
- var numTables = header.numTables;
-
- // Check that required tables are present
- var requiredTables = [
- "OS/2",
- "cmap",
- "head",
- "hhea",
- "hmtx",
- "maxp",
- "name",
- "post"
- ];
-
- var tables = [];
- for (var i = 0; i < numTables; i++) {
- var table = this._readTableEntry(aFile);
- var index = requiredTables.indexOf(table.tag);
- if (index != -1)
- requiredTables.splice(index, 1);
-
- tables.push(table);
- }
-
- // Tables needs to be written by ascendant alphabetic order
- tables.sort(function(a, b) {
- return a.tag > b.tag;
- });
-
- // If any tables are still in the array this means some required tables are
- // missing, which means that we need to rebuild the font in order to pass
- // the sanitizer.
- if (requiredTables.length && requiredTables[0] == "OS/2") {
- OS2 = [
- 0x00, 0x03, // version
- 0x02, 0x24, // xAvgCharWidth
- 0x01, 0xF4, // usWeightClass
- 0x00, 0x05, // usWidthClass
- 0x00, 0x00, // fstype
- 0x02, 0x8A, // ySubscriptXSize
- 0x02, 0xBB, // ySubscriptYSize
- 0x00, 0x00, // ySubscriptXOffset
- 0x00, 0x8C, // ySubscriptYOffset
- 0x02, 0x8A, // ySuperScriptXSize
- 0x02, 0xBB, // ySuperScriptYSize
- 0x00, 0x00, // ySuperScriptXOffset
- 0x01, 0xDF, // ySuperScriptYOffset
- 0x00, 0x31, // yStrikeOutSize
- 0x01, 0x02, // yStrikeOutPosition
- 0x00, 0x00, // sFamilyClass
- 0x02, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Panose
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 0-31)
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 32-63)
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 64-95)
- 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 96-127)
- 0x2A, 0x32, 0x31, 0x2A, // achVendID
- 0x00, 0x20, // fsSelection
- 0x00, 0x2D, // usFirstCharIndex
- 0x00, 0x7A, // usLastCharIndex
- 0x00, 0x03, // sTypoAscender
- 0x00, 0x20, // sTypeDescender
- 0x00, 0x38, // sTypoLineGap
- 0x00, 0x5A, // usWinAscent
- 0x02, 0xB4, // usWinDescent
- 0x00, 0xCE, 0x00, 0x00, // ulCodePageRange1 (Bits 0-31)
- 0x00, 0x01, 0x00, 0x00, // ulCodePageRange2 (Bits 32-63)
- 0x00, 0x00, // sxHeight
- 0x00, 0x00, // sCapHeight
- 0x00, 0x01, // usDefaultChar
- 0x00, 0xCD, // usBreakChar
- 0x00, 0x02 // usMaxContext
- ];
-
- // Create a new file to hold the new version of our truetype with a new
- // header and new offsets
- var stream = aFile.stream || aFile;
- var ttf = new Uint8Array(stream.length + 16 + OS2.length);
-
- // The new numbers of tables will be the last one plus the num of missing
- // tables
- var numTables = header.numTables + 1;
-
- // The offsets object holds at the same time a representation of where
- // to write the table entry information about a table and another offset
- // representing the offset where to draw the actual data of a particular
- // table
- var offsets = {
- currentOffset: 0,
- virtualOffset: numTables * (4 * 4)
- };
-
- // Write the sfnt header with one more table
- this._createOpenTypeHeader(ttf, offsets, numTables);
-
- // Insert the missing table
- tables.unshift({
- tag: "OS/2",
- data: OS2
- });
-
- // rewrite the tables but tweak offsets
- for (var i = 0; i < tables.length; i++) {
- var table = tables[i];
- var data = [];
-
- var tableData = table.data;
- for (var j = 0; j < tableData.length; j++)
- data.push(tableData[j]);
- this._createTableEntry(ttf, offsets, table.tag, data);
- }
-
- // Add the table datas
- for (var i = 0; i < tables.length; i++) {
- var table = tables[i];
- var tableData = table.data;
- ttf.set(tableData, offsets.currentOffset);
- offsets.currentOffset += tableData.length;
-
- if (0) {
- var data = [];
- for (var j = 0; j < tableData.length; j++)
- d.push(tableData[j]);
- log("data for table: " + table.tag + ": " + data);
- }
-
- // 4-byte aligned data
- while (offsets.currentOffset & 3)
- offsets.currentOffset++;
- }
-
- var fontData = [];
- for (var i = 0; i < ttf.length; i++)
- fontData.push(ttf[i]);
-
- this.data = ttf;
- return;
- } else if (requiredTables.lenght) {
- error("Table " + requiredTables[0] + " is missing from the TruType font");
- } else {
- this.data = aFile;
- }
-};
-
-TrueType.prototype = {
- _createOpenTypeHeader: function tt_createOpenTypeHeader(aFile, aOffsets, aNumTables) {
- // sfnt version (4 bytes)
- // XXX if we want to merge this function and the one from the Font class
- // XXX this need to be adapted
- var version = [0x00, 0x01, 0x00, 0X00];
-
- // numTables (2 bytes)
- var numTables = aNumTables;
-
- // searchRange (2 bytes)
- var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
- var searchRange = tablesMaxPower2 * 16;
-
- // entrySelector (2 bytes)
- var entrySelector = Math.log(tablesMaxPower2) / Math.log(2);
-
- // rangeShift (2 bytes)
- var rangeShift = numTables * 16 - searchRange;
-
- var header = [].concat(version,
- FontsUtils.integerToBytes(numTables, 2),
- FontsUtils.integerToBytes(searchRange, 2),
- FontsUtils.integerToBytes(entrySelector, 2),
- FontsUtils.integerToBytes(rangeShift, 2));
- aFile.set(header, aOffsets.currentOffset);
- aOffsets.currentOffset += header.length;
- aOffsets.virtualOffset += header.length;
- },
-
- _createTableEntry: function font_createTableEntry(aFile, aOffsets, aTag, aData) {
- // tag
- var tag = [
- aTag.charCodeAt(0),
- aTag.charCodeAt(1),
- aTag.charCodeAt(2),
- aTag.charCodeAt(3)
- ];
-
- // Per spec tables must be 4-bytes align so add some 0x00 if needed
- while (aData.length & 3)
- aData.push(0x00);
-
- while (aOffsets.virtualOffset & 3)
- aOffsets.virtualOffset++;
-
- // offset
- var offset = aOffsets.virtualOffset;
-
- // length
- var length = aData.length;
-
- // checksum
- var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
-
- var tableEntry = [].concat(tag,
- FontsUtils.integerToBytes(checksum, 4),
- FontsUtils.integerToBytes(offset, 4),
- FontsUtils.integerToBytes(length, 4));
- aFile.set(tableEntry, aOffsets.currentOffset);
- aOffsets.currentOffset += tableEntry.length;
- aOffsets.virtualOffset += aData.length;
- },
-
- _readOpenTypeHeader: function tt_readOpenTypeHeader(aFile) {
- return {
- version: aFile.getBytes(4),
- numTables: FontsUtils.bytesToInteger(aFile.getBytes(2)),
- searchRange: FontsUtils.bytesToInteger(aFile.getBytes(2)),
- entrySelector: FontsUtils.bytesToInteger(aFile.getBytes(2)),
- rangeShift: FontsUtils.bytesToInteger(aFile.getBytes(2))
- }
- },
-
- _readTableEntry: function tt_readTableEntry(aFile) {
- // tag
- var tag = aFile.getBytes(4);
- tag = String.fromCharCode(tag[0]) +
- String.fromCharCode(tag[1]) +
- String.fromCharCode(tag[2]) +
- String.fromCharCode(tag[3]);
-
- var checksum = FontsUtils.bytesToInteger(aFile.getBytes(4));
- var offset = FontsUtils.bytesToInteger(aFile.getBytes(4));
- var length = FontsUtils.bytesToInteger(aFile.getBytes(4));
-
- // Read the table associated data
- var currentPosition = aFile.pos;
- aFile.pos = aFile.start + offset;
- var data = aFile.getBytes(length);
- aFile.pos = currentPosition;
-
- return {
- tag: tag,
- checksum: checksum,
- length: offset,
- offset: length,
- data: data
- }
- }
-};
-
-
-/**
- * This dictionary holds decoded fonts data.
- */
-var Type1Parser = function() {
- // Turn on this flag for additional debugging logs
- var debug = false;
-
- var dump = function(aData) {
- if (debug)
- log(aData);
- };
-
- /*
- * Decrypt a Sequence of Ciphertext Bytes to Produce the Original Sequence
- * of Plaintext Bytes. The function took a key as a parameter which can be
- * for decrypting the eexec block of for decoding charStrings.
- */
- var kEexecEncryptionKey = 55665;
- var kCharStringsEncryptionKey = 4330;
-
- function decrypt(aStream, aKey, aDiscardNumber, aByteArray) {
- var start = Date.now();
- var r = aKey, c1 = 52845, c2 = 22719;
- var decryptedString = [];
-
- var value = "";
- var count = aStream.length;
- for (var i = 0; i < count; i++) {
- value = aStream[i];
- if (aByteArray)
- decryptedString[i] = value ^ (r >> 8);
- else
- decryptedString[i] = String.fromCharCode(value ^ (r >> 8));
- r = ((value + r) * c1 + c2) & ((1 << 16) - 1);
- }
- var end = Date.now();
- dump("Time to decrypt string of length " + count + " is " + (end - start));
- return decryptedString.slice(aDiscardNumber);
- };
-
- /*
- * CharStrings are encoded following the the CharString Encoding sequence
- * describe in Chapter 6 of the "Adobe Type1 Font Format" specification.
- * The value in a byte indicates a command, a number, or subsequent bytes
- * that are to be interpreted in a special way.
- *
- * CharString Number Encoding:
- * A CharString byte containing the values from 32 through 255 inclusive
- * indicate an integer. These values are decoded in four ranges.
- *
- * 1. A CharString byte containing a value, v, between 32 and 246 inclusive,
- * indicate the integer v - 139. Thus, the integer values from -107 through
- * 107 inclusive may be encoded in single byte.
- *
- * 2. A CharString byte containing a value, v, between 247 and 250 inclusive,
- * indicates an integer involving the next byte, w, according to the formula:
- * [(v - 247) x 256] + w + 108
- *
- * 3. A CharString byte containing a value, v, between 251 and 254 inclusive,
- * indicates an integer involving the next byte, w, according to the formula:
- * -[(v - 251) * 256] - w - 108
- *
- * 4. A CharString containing the value 255 indicates that the next 4 bytes
- * are a two complement signed integer. The first of these bytes contains the
- * highest order bits, the second byte contains the next higher order bits
- * and the fourth byte contain the lowest order bits.
- *
- *
- * CharString Command Encoding:
- * CharStrings commands are encoded in 1 or 2 bytes.
- *
- * Single byte commands are encoded in 1 byte that contains a value between
- * 0 and 31 inclusive.
- * If a command byte contains the value 12, then the value in the next byte
- * indicates a command. This "escape" mechanism allows many extra commands
- * to be encoded and this encoding technique helps to minimize the length of
- * the charStrings.
- */
- var charStringDictionary = {
- "1": "hstem",
- "3": "vstem",
- "4": "vmoveto",
- "5": "rlineto",
- "6": "hlineto",
- "7": "vlineto",
- "8": "rrcurveto",
-
- // closepath is a Type1 command that do not take argument and is useless
- // in Type2 and it can simply be ignored.
- "9": null, // closepath
-
- "10": "callsubr",
-
- // return is normally used inside sub-routines to tells to the execution
- // flow that it can be back to normal.
- // During the translation process Type1 charstrings will be flattened and
- // sub-routines will be embedded directly into the charstring directly, so
- // this can be ignored safely.
- "11": "return",
-
- "12": {
- // dotsection is a Type1 command to specify some hinting feature for dots
- // that do not take a parameter and it can safely be ignored for Type2.
- "0": null, // dotsection
-
- // [vh]stem3 are Type1 only and Type2 supports [vh]stem with multiple
- // parameters, so instead of returning [vh]stem3 take a shortcut and
- // return [vhstem] instead.
- "1": "vstem",
- "2": "hstem",
-
- // Type1 only command with command not (yet) built-in ,throw an error
- "6": -1, // seac
- "7": -1, //sbw
-
- "12": "div",
-
- // callothersubr is a mechanism to make calls on the postscript
- // interpreter.
- // TODO When decodeCharstring encounter such a command it should
- // directly do:
- // - pop the previous charstring[] command into 'index'
- // - pop the previous charstring[] command and ignore it, it is
- // normally the number of element to push on the stack before
- // the command but since everything will be pushed on the stack
- // by the PS interpreter when it will read them that is safe to
- // ignore this command
- // - push the content of the OtherSubrs[index] inside charstring[]
- "16": "callothersubr",
-
- "17": "pop",
-
- // setcurrentpoint sets the current point to x, y without performing a
- // moveto (this is a one shot positionning command). This is used only
- // with the return of an OtherSubrs call.
- // TODO Implement the OtherSubrs charstring embedding and replace this
- // call by a no-op, like 2 'pop' commands for example.
- "33": null, //setcurrentpoint
- },
- "13": "hsbw",
- "14": "endchar",
- "21": "rmoveto",
- "22": "hmoveto",
- "30": "vhcurveto",
- "31": "hvcurveto"
- };
-
- function decodeCharString(aArray) {
- var charString = [];
-
- var value = "";
- var count = aArray.length;
- for (var i = 0; i < count; i++) {
- value = parseInt(aArray[i]);
-
- if (value < 32) {
- var command = null;
- if (value == 12) {
- var escape = aArray[++i];
- command = charStringDictionary["12"][escape];
- } else {
- command = charStringDictionary[value];
- }
-
- // Some charstring commands are meaningless in Type2 and will return
- // a null, let's just ignored them
- if (!command && i < count) {
- continue;
- } else if (!command) {
- break;
- } else if (command == -1) {
- log("decodeCharstring: " + charString);
- error("Support for Type1 command " + value + " (" + escape + ") is not implemented");
- }
-
- value = command;
- } else if (value <= 246) {
- value = parseInt(value) - 139;
- } else if (value <= 250) {
- value = ((value - 247) * 256) + parseInt(aArray[++i]) + 108;
- } else if (value <= 254) {
- value = -((value - 251) * 256) - parseInt(aArray[++i]) - 108;
- } else {
- var byte = aArray[++i];
- var high = (byte >> 1);
- value = (byte - high) << 24 | aArray[++i] << 16 |
- aArray[++i] << 8 | aArray[++i];
- }
-
- charString.push(value);
- }
-
- return charString;
- };
-
- /**
- * Returns an object containing a Subrs array and a CharStrings array
- * extracted from and eexec encrypted block of data
- */
- this.extractFontInfo = function(aStream) {
- var eexecString = decrypt(aStream, kEexecEncryptionKey, 4, true);
- var subrs = [], glyphs = [];
- var inSubrs = inGlyphs = false;
- var glyph = "";
-
- var token = "";
- var index = 0;
- var length = 0;
-
- var count = eexecString.length;
- var c = "";
- for (var i = 0; i < count; i++) {
- var c = eexecString[i];
-
- if (inSubrs && c == 0x52) {
- length = parseInt(length);
- var data = eexecString.slice(i + 3, i + 3 + length);
- var encodedSubr = decrypt(data, kCharStringsEncryptionKey, 4, true);
- var subr = decodeCharString(encodedSubr);
-
- subrs.push(subr);
- i += 3 + length;
- } else if (inGlyphs && c == 0x52) {
- length = parseInt(length);
- var data = eexecString.slice(i + 3, i + 3 + length);
- var encodedCharstring = decrypt(data, kCharStringsEncryptionKey, 4, true);
- var subr = decodeCharString(encodedCharstring);
-
- glyphs.push({
- glyph: glyph,
- data: subr
- });
- i += 3 + length;
- } else if (inGlyphs && c == 0x2F) {
- token = "";
- glyph = "";
-
- while ((c = eexecString[++i]) != 0x20)
- glyph += String.fromCharCode(c);
- } else if (!inSubrs && !inGlyphs && c == 0x2F && eexecString[i+1] == 0x53) {
- while ((c = eexecString[++i]) != 0x20) {};
- inSubrs = true;
- } else if (c == 0x20) {
- index = length;
- length = token;
- token = "";
- } else if (c == 0x2F && eexecString[i+1] == 0x43 && eexecString[i+2] == 0x68) {
- while ((c = eexecString[++i]) != 0x20) {};
- inSubrs = false;
- inGlyphs = true;
- } else {
- token += String.fromCharCode(c);
- }
- }
- return {
- subrs: subrs,
- charstrings: glyphs
- }
- }
-};
-
-var CFF = function(aFontName, aFontBBox, aFontFile) {
- // Get the data block containing glyphs and subrs informations
- var length1 = aFontFile.dict.get("Length1");
- var length2 = aFontFile.dict.get("Length2");
- aFontFile.skip(length1);
- var eexecBlock = aFontFile.getBytes(length2);
-
- // Extract informations from it
- var start = Date.now();
- var parser = new Type1Parser();
- var fontInfo = parser.extractFontInfo(eexecBlock);
- fontInfo.name = aFontName;
- fontInfo.bbox = aFontBBox;
-
- // XXX This hold the glyph data as if, this should be improved
- this.glyphs = fontInfo.charstrings;
-
- this.data = this.convertToCFF(fontInfo);
- var end = Date.now();
-};
-
-CFF.prototype = {
- createCFFIndexHeader: function(aObjects, aIsByte) {
- var data = [];
-
- // First 2 bytes contains the number of objects contained into this index
- var count = aObjects.length;
- if (count ==0)
- return [0x00, 0x00, 0x00];
-
- var bytes = FontsUtils.integerToBytes(count, 2);
- for (var i = 0; i < bytes.length; i++)
- data.push(bytes[i]);
-
- // Next byte contains the offset size use to reference object in the file
- // Actually we're using 0x04 to be sure to be able to store everything
- // without thinking of it while coding.
- data.push(0x04);
-
- // Add another offset after this one because we need a new offset
- var relativeOffset = 1;
- for (var i = 0; i < count + 1; i++) {
- var bytes = FontsUtils.integerToBytes(relativeOffset, 4);
- for (var j = 0; j < bytes.length; j++)
- data.push(bytes[j]);
-
- if (aObjects[i])
- relativeOffset += aObjects[i].length;
- }
-
- for (var i =0; i < count; i++) {
- for (var j = 0; j < aObjects[i].length; j++)
- data.push(aIsByte ? aObjects[i][j] : aObjects[i].charCodeAt(j));
- }
- return data;
- },
-
- encodeNumber: function(aValue) {
- var x = 0;
- if (aValue >= -32768 && aValue <= 32767) {
- return [ 28, aValue >> 8, aValue ];
- } else if (aValue >= (-2147483647-1) && aValue <= 2147483647) {
- return [
- 0xFF, aValue >> 24, Value >> 16, aValue >> 8, aValue ];
- } else {
- error("Value: " + aValue + " is not allowed");
- }
- },
-
- getOrderedCharStrings: function(aGlyphs) {
- var charstrings = [];
-
- for (var i = 0; i < aGlyphs.length; i++) {
- var glyph = aGlyphs[i].glyph;
- var unicode = GlyphsUnicode[glyph];
- if (!unicode) {
- if (glyph != ".notdef")
- warn(glyph + " does not have an entry in the glyphs unicode dictionary");
- } else {
- var b1 = parseInt("0x" + unicode[0] + unicode[1]);
- var b2 = parseInt("0x" + unicode[2] + unicode[3]);
- unicode = FontsUtils.bytesToInteger([b1, b2]);
-
- charstrings.push({
- glyph: glyph,
- unicode: unicode,
- charstring: aGlyphs[i].data.slice()
- });
- }
- };
-
- charstrings.sort(function(a, b) {
- return a.unicode > b.unicode;
- });
- return charstrings;
- },
-
- /*
- * Flatten the commands by interpreting the postscript code and replacing
- * every 'callsubr', 'callothersubr' by the real commands.
- *
- * TODO This function also do a string to command number transformation
- * that can probably be avoided if the Type1 decodeCharstring code is smarter
- */
- commandsMap: {
- "hstem": 1,
- "vstem": 3,
- "vmoveto": 4,
- "rlineto": 5,
- "hlineto": 6,
- "vlineto": 7,
- "rrcurveto": 8,
- "endchar": 14,
- "rmoveto": 21,
- "hmoveto": 22,
- "vhcurveto": 30,
- "hvcurveto": 31,
- },
-
- flattenCharstring: function(aGlyph, aCharstring, aSubrs) {
- var original = aCharstring.slice();
- var i = 0;
- while (true) {
- var obj = aCharstring[i];
- if (obj == null)
- return [];
-
- if (obj.charAt) {
- switch (obj) {
- case "callsubr":
- var subr = aSubrs[aCharstring[i - 1]].slice();
- if (subr.length > 1) {
- subr = this.flattenCharstring(aGlyph, subr, aSubrs);
- subr.pop();
- aCharstring.splice(i - 1, 2, subr);
- } else {
- aCharstring.splice(i - 1, 2);
- }
- i -= 1;
- break;
-
- case "callothersubr":
- var index = aCharstring[i - 1];
- var count = aCharstring[i - 2];
- var data = aCharstring[i - 3];
-
- // XXX The callothersubr needs to support at least the 3 defaults
- // otherSubrs of the spec
- if (index != 3)
- error("callothersubr for index: " + index + " (" + aCharstring + ")");
-
- if (!data) {
- aCharstring.splice(i - 2, 4, "pop", 3);
- i -= 3;
- } else {
- // 5 to remove the arguments, the callothersubr call and the pop command
- aCharstring.splice(i - 3, 5, 3);
- i -= 3;
- }
- break;
-
- case "div":
- var num2 = aCharstring[i - 1];
- var num1 = aCharstring[i - 2];
- aCharstring.splice(i - 2, 3, num2 / num1);
- i -= 2;
- break;
-
- case "pop":
- if (i)
- aCharstring.splice(i - 2, 2);
- else
- aCharstring.splice(i - 1, 1);
- i -= 1;
- break;
-
-
- case "hsbw":
- var charWidthVector = aCharstring[i - 1];
- var leftSidebearing = aCharstring[i - 2];
-
- if (leftSidebearing)
- aCharstring.splice(i - 2, 3, charWidthVector, leftSidebearing, "hmoveto");
- else
- aCharstring.splice(i - 2, 3, charWidthVector);
- break;
-
- case "endchar":
- case "return":
- // CharString is ready to be re-encode to commands number at this point
- for (var j = 0; j < aCharstring.length; j++) {
- var command = aCharstring[j];
- if (parseFloat(command) == command) {
- aCharstring.splice(j, 1, 28, command >> 8, command);
- j+= 2;
- } else if (command.charAt) {
- var command = this.commandsMap[command];
- if (IsArray(command)) {
- aCharstring.splice(j - 1, 1, command[0], command[1]);
- j += 1;
- } else {
- aCharstring[j] = command;
- }
- } else {
- aCharstring.splice(j, 1);
-
- // command has already been translated, just add them to the
- // charstring directly
- for (var k = 0; k < command.length; k++)
- aCharstring.splice(j + k, 0, command[k]);
- j+= command.length - 1;
- }
- }
- return aCharstring;
-
- default:
- break;
- }
- }
- i++;
- }
- error("failing with i = " + i + " in charstring:" + aCharstring + "(" + aCharstring.length + ")");
- },
-
- convertToCFF: function(aFontInfo) {
- var debug = false;
- function dump(aMsg) {
- if (debug)
- log(aMsg);
- };
-
- var charstrings = this.getOrderedCharStrings(aFontInfo.charstrings);
-
- // Starts the conversion of the Type1 charstrings to Type2
- var start = Date.now();
- var charstringsCount = 0;
- var charstringsDataLength = 0;
- var glyphs = [];
- for (var i = 0; i < charstrings.length; i++) {
- var charstring = charstrings[i].charstring.slice();
- var glyph = charstrings[i].glyph;
-
- var flattened = this.flattenCharstring(glyph, charstring, aFontInfo.subrs);
- glyphs.push(flattened);
- charstringsCount++;
- charstringsDataLength += flattened.length;
- }
-
- var end = Date.now();
- dump("There is " + charstringsCount + " glyphs (size: " + charstringsDataLength + ")");
- dump("Time to flatten the strings is : " + (end -start));
-
- // Create a CFF font data
- var cff = new Uint8Array(kMaxFontFileSize);
- var currentOffset = 0;
-
- // Font header (major version, minor version, header size, offset size)
- var header = [0x01, 0x00, 0x04, 0x04];
- currentOffset += header.length;
- cff.set(header);
-
- // Names Index
- var nameIndex = this.createCFFIndexHeader([aFontInfo.name]);
- cff.set(nameIndex, currentOffset);
- currentOffset += nameIndex.length;
-
- // Calculate strings before writing the TopDICT index in order
- // to calculate correct relative offsets for storing 'charset'
- // and 'charstrings' data
- var version = "";
- var notice = "";
- var fullName = "";
- var familyName = "";
- var weight = "";
- var strings = [version, notice, fullName,
- familyName, weight];
- var stringsIndex = this.createCFFIndexHeader(strings);
- var stringsDataLength = stringsIndex.length;
-
- // Create the global subroutines index
- var globalSubrsIndex = this.createCFFIndexHeader([]);
-
- // Fill the charset header (first byte is the encoding)
- var charset = [0x00];
- for (var i = 0; i < glyphs.length; i++) {
- var index = CFFStrings.indexOf(charstrings[i].glyph);
- if (index == -1)
- index = CFFStrings.length + strings.indexOf(glyph);
- var bytes = FontsUtils.integerToBytes(index, 2);
- charset.push(bytes[0]);
- charset.push(bytes[1]);
- }
-
- var charstringsIndex = this.createCFFIndexHeader([[0x40, 0x0E]].concat(glyphs), true);
- charstringsIndex = charstringsIndex.join(" ").split(" "); // XXX why?
-
- //Top Dict Index
- var topDictIndex = [
- 0x00, 0x01, 0x01, 0x01, 0x30,
- 248, 27, 0, // version
- 248, 28, 1, // Notice
- 248, 29, 2, // FullName
- 248, 30, 3, // FamilyName
- 248, 31, 4 // Weight
- ];
-
- var fontBBox = aFontInfo.bbox;
- for (var i = 0; i < fontBBox.length; i++)
- topDictIndex = topDictIndex.concat(this.encodeNumber(fontBBox[i]));
- topDictIndex.push(5) // FontBBox;
-
- var charsetOffset = currentOffset +
- (topDictIndex.length + (4 + 4 + 4 + 7)) +
- stringsIndex.length +
- globalSubrsIndex.length;
- topDictIndex = topDictIndex.concat(this.encodeNumber(charsetOffset));
- topDictIndex.push(15); // charset
-
- topDictIndex = topDictIndex.concat([28, 0, 0, 16]) // Encoding
-
- var charstringsOffset = charsetOffset + (charstringsCount * 2) + 1;
- topDictIndex = topDictIndex.concat(this.encodeNumber(charstringsOffset));
- topDictIndex.push(17); // charstrings
-
- topDictIndex = topDictIndex.concat([28, 0, 55])
- var privateOffset = charstringsOffset + charstringsIndex.length;
- topDictIndex = topDictIndex.concat(this.encodeNumber(privateOffset));
- topDictIndex.push(18); // Private
- topDictIndex = topDictIndex.join(" ").split(" ");
-
- var indexes = [
- topDictIndex, stringsIndex,
- globalSubrsIndex, charset,
- charstringsIndex
- ];
-
- for (var i = 0; i < indexes.length; i++) {
- var index = indexes[i];
- cff.set(index, currentOffset);
- currentOffset += index.length;
- }
-
- // Private Data
- var defaultWidth = this.encodeNumber(0);
- var privateData = [].concat(
- defaultWidth, [20],
- [139, 21], // nominalWidth
- [
- 119, 159, 248, 97, 159, 247, 87, 159, 6,
- 30, 10, 3, 150, 37, 255, 12, 9,
- 139, 12,
- 10, 172, 10,
- 172, 150, 143, 146, 150, 146, 12, 12,
- 247, 32, 11,
- 247, 10, 161, 147, 154, 150, 143, 12, 13,
- 139, 12, 14,
- 28, 0, 55, 19
- ]);
- privateData = privateData.join(" ").split(" ");
- cff.set(privateData, currentOffset);
- currentOffset += privateData.length;
-
- // Dump shit at the end of the file
- var shit = [
- 0x00, 0x01, 0x01, 0x01,
- 0x13, 0x5D, 0x65, 0x64,
- 0x5E, 0x5B, 0xAF, 0x66,
- 0xBA, 0xBB, 0xB1, 0xB0,
- 0xB9, 0xBA, 0x65, 0xB2,
- 0x5C, 0x1F, 0x0B
- ];
- cff.set(shit, currentOffset);
- currentOffset += shit.length;
-
- var fontData = [];
- for (var i = 0; i < currentOffset; i++)
- fontData.push(cff[i]);
-
- return fontData;
- }
-};
-
+++ /dev/null
-/**
- * The Type2 reader code below is only used for debugging purpose since Type2
- * is only a CharString format and is never used directly as a Font file.
- *
- * So the code here is useful for dumping the data content of a .cff file in
- * order to investigate the similarity between a Type1 CharString and a Type2
- * CharString or to understand the structure of the CFF format.
- */
-
-
-/**
- * Build a charset by assigning the glyph name and the human readable form
- * of the glyph data.
- */
-function readCharset(aStream, aCharstrings) {
- var charset = {};
-
- var format = aStream.getByte();
- if (format == 0) {
- charset[".notdef"] = readCharstringEncoding(aCharstrings[0]);
-
- var count = aCharstrings.length - 1;
- for (var i = 1; i < count + 1; i++) {
- var sid = aStream.getByte() << 8 | aStream.getByte();
- charset[CFFStrings[sid]] = readCharstringEncoding(aCharstrings[i]);
- //log(CFFStrings[sid] + "::" + charset[CFFStrings[sid]]);
- }
- } else if (format == 1) {
- error("Charset Range are not supported");
- } else {
- error("Invalid charset format");
- }
-
- return charset;
-};
-
-/**
- * Take a Type2 binary charstring as input and transform it to a human
- * readable representation as specified by the 'The Type 2 Charstring Format',
- * chapter 3.1.
- */
-function readCharstringEncoding(aString) {
- var charstringTokens = [];
-
- var count = aString.length;
- for (var i = 0; i < count; ) {
- var value = aString[i++];
- var token = null;
-
- if (value < 0) {
- continue;
- } else if (value <= 11) {
- token = CFFEncodingMap[value];
- } else if (value == 12) {
- token = CFFEncodingMap[value][aString[i++]];
- } else if (value <= 18) {
- token = CFFEncodingMap[value];
- } else if (value <= 20) {
- var mask = aString[i++];
- token = CFFEncodingMap[value];
- } else if (value <= 27) {
- token = CFFEncodingMap[value];
- } else if (value == 28) {
- token = aString[i++] << 8 | aString[i++];
- } else if (value <= 31) {
- token = CFFEncodingMap[value];
- } else if (value < 247) {
- token = parseInt(value) - 139;
- } else if (value < 251) {
- token = ((value - 247) * 256) + aString[i++] + 108;
- } else if (value < 255) {
- token = -((value - 251) * 256) - aString[i++] - 108;
- } else {// value == 255
- token = aString[i++] << 24 | aString[i++] << 16 |
- aString[i++] << 8 | aString[i];
- }
-
- charstringTokens.push(token);
- }
-
- return charstringTokens;
-};
-
-
-/**
- * Take a binary DICT Data as input and transform it into a human readable
- * form as specified by 'The Compact Font Format Specification', chapter 5.
- */
-function readFontDictData(aString, aMap) {
- var fontDictDataTokens = [];
-
- var count = aString.length;
- for (var i = 0; i < count; i) {
- var value = aString[i++];
- var token = null;
-
- if (value == 12) {
- token = aMap[value][aString[i++]];
- } else if (value == 28) {
- token = aString[i++] << 8 | aString[i++];
- } else if (value == 29) {
- token = aString[i++] << 24 |
- aString[i++] << 16 |
- aString[i++] << 8 |
- aString[i++];
- } else if (value == 30) {
- token = "";
- var parsed = false;
- while (!parsed) {
- var byte = aString[i++];
-
- var nibbles = [parseInt(byte / 16), parseInt(byte % 16)];
- for (var j = 0; j < nibbles.length; j++) {
- var nibble = nibbles[j];
- switch (nibble) {
- case 0xA:
- token += ".";
- break;
- case 0xB:
- token += "E";
- break;
- case 0xC:
- token += "E-";
- break;
- case 0xD:
- break;
- case 0xE:
- token += "-";
- break;
- case 0xF:
- parsed = true;
- break;
- default:
- token += nibble;
- break;
- }
- }
- };
- token = parseFloat(token);
- } else if (value <= 31) {
- token = aMap[value];
- } else if (value <= 246) {
- token = parseInt(value) - 139;
- } else if (value <= 250) {
- token = ((value - 247) * 256) + aString[i++] + 108;
- } else if (value <= 254) {
- token = -((value - 251) * 256) - aString[i++] - 108;
- } else if (value == 255) {
- error("255 is not a valid DICT command");
- }
-
- fontDictDataTokens.push(token);
- }
-
- return fontDictDataTokens;
-};
-
-
-/**
- * Take a stream as input and return an array of objects.
- * In CFF an INDEX is a structure with the following format:
- * {
- * count: 2 bytes (Number of objects stored in INDEX),
- * offsize: 1 byte (Offset array element size),
- * offset: [count + 1] bytes (Offsets array),
- * data: - (Objects data)
- * }
- *
- * More explanation are given in the 'CFF Font Format Specification',
- * chapter 5.
- */
-function readFontIndexData(aStream, aIsByte) {
- var count = aStream.getByte() << 8 | aStream.getByte();
- var offsize = aStream.getByte();
-
- function getNextOffset() {
- switch (offsize) {
- case 0:
- return 0;
- case 1:
- return aStream.getByte();
- case 2:
- return aStream.getByte() << 8 | aStream.getByte();
- case 3:
- return aStream.getByte() << 16 | aStream.getByte() << 8 |
- aStream.getByte();
- case 4:
- return aStream.getByte() << 24 | aStream.getByte() << 16 |
- aStream.getByte() << 8 | aStream.getByte();
- }
- };
-
- var offsets = [];
- for (var i = 0; i < count + 1; i++)
- offsets.push(getNextOffset());
-
- log("Found " + count + " objects at offsets :" + offsets + " (offsize: " + offsize + ")");
-
- // Now extract the objects
- var relativeOffset = aStream.pos;
- var objects = [];
- for (var i = 0; i < count; i++) {
- var offset = offsets[i];
- aStream.pos = relativeOffset + offset - 1;
-
- var data = [];
- var length = offsets[i + 1] - 1;
- for (var j = offset - 1; j < length; j++)
- data.push(aIsByte ? aStream.getByte() : aStream.getChar());
- objects.push(data);
- }
-
- return objects;
-};
-
-var Type2Parser = function(aFilePath) {
- var font = new Dict();
-
- var xhr = new XMLHttpRequest();
- xhr.open("GET", aFilePath, false);
- xhr.mozResponseType = xhr.responseType = "arraybuffer";
- xhr.expected = (document.URL.indexOf("file:") == 0) ? 0 : 200;
- xhr.send(null);
- this.data = new Stream(xhr.mozResponseArrayBuffer || xhr.mozResponse ||
- xhr.responseArrayBuffer || xhr.response);
-
- // Turn on this flag for additional debugging logs
- var debug = false;
-
- function dump(aStr) {
- if (debug)
- log(aStr);
- };
-
- function parseAsToken(aString, aMap) {
- var decoded = readFontDictData(aString, aMap);
-
- var stack = [];
- var count = decoded.length;
- for (var i = 0; i < count; i++) {
- var token = decoded[i];
- if (IsNum(token)) {
- stack.push(token);
- } else {
- switch (token.operand) {
- case "SID":
- font.set(token.name, CFFStrings[stack.pop()]);
- break;
- case "number number":
- font.set(token.name, {
- offset: stack.pop(),
- size: stack.pop()
- });
- break;
- case "boolean":
- font.set(token.name, stack.pop());
- break;
- case "delta":
- font.set(token.name, stack.pop());
- break;
- default:
- if (token.operand && token.operand.length) {
- var array = [];
- for (var j = 0; j < token.operand.length; j++)
- array.push(stack.pop());
- font.set(token.name, array);
- } else {
- font.set(token.name, stack.pop());
- }
- break;
- }
- }
- }
- };
-
- this.parse = function(aStream) {
- font.set("major", aStream.getByte());
- font.set("minor", aStream.getByte());
- font.set("hdrSize", aStream.getByte());
- font.set("offsize", aStream.getByte());
-
- // Move the cursor after the header
- aStream.skip(font.get("hdrSize") - aStream.pos);
-
- // Read the NAME Index
- dump("Reading Index: Names");
- font.set("Names", readFontIndexData(aStream));
- log("Names: " + font.get("Names"));
-
- // Read the Top Dict Index
- dump("Reading Index: TopDict");
- var topDict = readFontIndexData(aStream, true);
- log("TopDict: " + topDict);
-
- // Read the String Index
- dump("Reading Index: Strings");
- var strings = readFontIndexData(aStream);
- log("strings: " + strings);
-
- // Fill up the Strings dictionary with the new unique strings
- for (var i = 0; i < strings.length; i++)
- CFFStrings.push(strings[i].join(""));
-
- // Parse the TopDict operator
- var objects = [];
- var count = topDict.length;
- for (var i = 0; i < count; i++)
- parseAsToken(topDict[i], CFFDictDataMap);
-
- // Read the Global Subr Index that comes just after the Strings Index
- // (cf. "The Compact Font Format Specification" Chapter 16)
- dump("Reading Global Subr Index");
- var subrs = readFontIndexData(aStream, true);
- dump(subrs);
-
- // Reading Private Dict
- var private = font.get("Private");
- log("Reading Private Dict (offset: " + private.offset + " size: " + private.size + ")");
- aStream.pos = private.offset;
-
- var privateDict = [];
- for (var i = 0; i < private.size; i++)
- privateDict.push(aStream.getByte());
- dump("private:" + privateDict);
- parseAsToken(privateDict, CFFDictPrivateDataMap);
-
- for (var p in font.map)
- dump(p + "::" + font.get(p));
-
- // Read CharStrings Index
- var charStringsOffset = font.get("CharStrings");
- dump("Read CharStrings Index (offset: " + charStringsOffset + ")");
- aStream.pos = charStringsOffset;
- var charStrings = readFontIndexData(aStream, true);
-
- // Read Charset
- dump("Read Charset for " + charStrings.length + " glyphs");
- var charsetEntry = font.get("charset");
- if (charsetEntry == 0) {
- error("Need to support CFFISOAdobeCharset");
- } else if (charsetEntry == 1) {
- error("Need to support CFFExpert");
- } else if (charsetEntry == 2) {
- error("Need to support CFFExpertSubsetCharset");
- } else {
- aStream.pos = charsetEntry;
- var charset = readCharset(aStream, charStrings);
- }
- }
-};
-
-/*
- * To try the Type2 decoder on a local file in the current directory:
- *
- * var cff = new Type2Parser("file.cff");
- * cff.parse(this.data);
- *
- * To try the Type2 decoder on a custom built CFF array:
- *
- * var file = new Uint8Array(cffFileArray, 0, cffFileSize);
- * var parser = new Type2Parser();
- * parser.parse(new Stream(file));
- *
- */
-
-
-/**
- * Write to a file to the disk (works only on Firefox in privilege mode)
- * but this is useful for dumping a font file to the disk and check with
- * fontforge or the ots program what's wrong with the file.
- *
- * writeToFile(fontData, "/tmp/pdf.js." + fontCount + ".cff");
- */
-function writeToFile(aBytes, aFilePath) {
- netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
- var Cc = Components.classes,
- Ci = Components.interfaces;
- var file = Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsILocalFile);
- file.initWithPath(aFilePath);
-
- var stream = Cc["@mozilla.org/network/file-output-stream;1"]
- .createInstance(Ci.nsIFileOutputStream);
- stream.init(file, 0x04 | 0x08 | 0x20, 0600, 0);
-
- var bos = Cc["@mozilla.org/binaryoutputstream;1"]
- .createInstance(Ci.nsIBinaryOutputStream);
- bos.setOutputStream(stream);
- bos.writeByteArray(aBytes, aBytes.length);
- stream.close();
-};
-
--- /dev/null
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+
+/**
+ * Maximum file size of the font.
+ */
+var kMaxFontFileSize = 40000;
+
+/**
+ * Maximum number of glyphs per font.
+*/
+var kMaxGlyphsCount = 65526;
+
+/**
+ * Maximum time to wait for a font to be loaded by @font-face
+ */
+var kMaxWaitForFontFace = 1000;
+
+/**
+ * Useful for debugging when you want to certains operations depending on how
+ * many fonts are loaded.
+ */
+var fontCount = 0;
+
+/**
+ * Hold a map of decoded fonts and of the standard fourteen Type1 fonts and
+ * their acronyms.
+ * TODO Add the standard fourteen Type1 fonts list by default
+ * http://cgit.freedesktop.org/poppler/poppler/tree/poppler/GfxFont.cc#n65
+ */
+var Fonts = {
+ _active: null,
+ get active() {
+ return this._active || { encoding: [] };
+ },
+
+ set active(aName) {
+ this._active = this[aName];
+ },
+
+ unicodeFromCode: function fonts_unicodeFromCode(aCode) {
+ var unicode = GlyphsUnicode[this.active.encoding[aCode]];
+ return unicode ? "0x" + unicode : aCode;
+ }
+};
+
+/**
+ * 'Font' is the class the outside world should use, it encapsulate all the font
+ * decoding logics whatever type it is (assuming the font type is supported).
+ *
+ * For example to read a Type1 font and to attach it to the document:
+ * var type1Font = new Font("MyFontName", binaryData, aFontEncoding, "Type1");
+ * type1Font.bind();
+ *
+ * As an improvment the last parameter can be replaced by an automatic guess
+ * of the font type based on the first byte of the file.
+ *
+ * FIXME There is now too many parameters, this should be turned into an
+ * object containing all the required informations about the font
+ */
+var Font = function(aName, aFile, aEncoding, aCharset, aBBox, aType) {
+ this.name = aName;
+
+ // If the font has already been decoded simply return
+ if (Fonts[aName]) {
+ this.font = Fonts[aName].data;
+ return;
+ }
+ fontCount++;
+
+ var start = Date.now();
+ switch (aType) {
+ case "Type1":
+ var cff = new CFF(aName, aBBox, aFile);
+ this.mimetype = "font/otf";
+
+ // Wrap the CFF data inside an OTF font file
+ this.font = this.cover(cff);
+ break;
+
+ case "TrueType":
+ return Fonts[aName] = {
+ data: null,
+ encoding: {},
+ charset: null,
+ loading: false
+ };
+
+ // TrueType is disabled for the moment since the sanitizer prevent it
+ // from loading
+ this.mimetype = "font/ttf";
+ var ttf = new TrueType(aFile);
+ this.font = ttf.data;
+ break;
+
+ default:
+ warn("Font " + aType + " is not supported");
+ break;
+ }
+ var end = Date.now();
+
+ Fonts[aName] = {
+ data: this.font,
+ encoding: aEncoding,
+ charset: aCharset ? aCharset.slice() : null,
+ loading: true
+ }
+
+ // Attach the font to the document
+ this.bind();
+};
+
+
+/**
+ * A bunch of the OpenType code is duplicate between this class and the
+ * TrueType code, this is intentional and will merge in a future version
+ * where all the code relative to OpenType will probably have its own
+ * class and will take decision without the Fonts consent.
+ * But at the moment it allows to develop around the TrueType rewriting
+ * on the fly without messing up with the 'regular' Type1 to OTF conversion.
+ */
+Font.prototype = {
+ name: null,
+ font: null,
+ mimetype: null,
+
+ bind: function font_bind() {
+ var data = this.font;
+
+ // Compute the binary data to base 64
+ var str = [];
+ var count = data.length;
+ for (var i = 0; i < count; i++)
+ str.push(data.getChar ? data.getChar()
+ : String.fromCharCode(data[i]));
+
+ var dataBase64 = window.btoa(str.join(""));
+ var fontName = this.name;
+
+ /** Hack begin */
+
+ // Actually there is not event when a font has finished downloading so
+ // the following tons of code are a dirty hack to 'guess' when a font is
+ // ready
+ var debug = false;
+
+ if (debug) {
+ var name = document.createElement("font");
+ name.setAttribute("style", "position: absolute; left: 20px; top: " +
+ (100 * fontCount + 60) + "px");
+ name.innerHTML = fontName;
+ document.body.appendChild(name);
+ }
+
+ var canvas = document.createElement("canvas");
+ var style = "border: 1px solid black; position:absolute; top: " +
+ (debug ? (100 * fontCount) : "-200") + "px; left: 2px; width: 340px; height: 100px";
+ canvas.setAttribute("style", style);
+ canvas.setAttribute("width", 340);
+ canvas.setAttribute("heigth", 100);
+ document.body.appendChild(canvas);
+
+ // Retrieve font charset
+ var charset = Fonts[fontName].charset || [];
+ // if the charset is too small make it repeat a few times
+ var count = 30;
+ while (count-- && charset.length <= 30)
+ charset = charset.concat(charset.slice());
+
+ // Get the font size canvas think it will be for 'spaces'
+ var ctx = canvas.getContext("2d");
+ var testString = " ";
+
+ // When debugging use the characters provided by the charsets to visually
+ // see what's happening
+ if (debug) {
+ for (var i = 0; i < charset.length; i++) {
+ var unicode = new Number("0x" + GlyphsUnicode[charset[i]]);
+ if (!unicode)
+ error("Unicode for " + charset[i] + " is has not been found in the glyphs list");
+ testString += String.fromCharCode(unicode);
+ }
+ }
+ ctx.font = "bold italic 20px " + fontName + ", Symbol, Arial";
+ var textWidth = ctx.mozMeasureText(testString);
+
+ if (debug)
+ ctx.fillText(testString, 20, 20);
+
+ var start = Date.now();
+ var interval = window.setInterval(function canvasInterval(self) {
+ ctx.font = "bold italic 20px " + fontName + ", Symbol, Arial";
+
+ // For some reasons the font has not loaded, so mark it loaded for the
+ // page to proceed but cry
+ if ((Date.now() - start) >= kMaxWaitForFontFace) {
+ window.clearInterval(interval);
+ Fonts[fontName].loading = false;
+ warn("Is " + fontName + " for charset: " + charset + " loaded?");
+ } else if (textWidth != ctx.mozMeasureText(testString)) {
+ window.clearInterval(interval);
+ Fonts[fontName].loading = false;
+ }
+
+ if (debug)
+ ctx.fillText(testString, 20, 50);
+ }, 20, this);
+
+ /** Hack end */
+
+ // Add the @font-face rule to the document
+ var url = "url(data:" + this.mimetype + ";base64," + dataBase64 + ");";
+ var rule = "@font-face { font-family:'" + fontName + "';src:" + url + "}";
+ var styleSheet = document.styleSheets[0];
+ styleSheet.insertRule(rule, styleSheet.length);
+ },
+
+ _createOpenTypeHeader: function font_createOpenTypeHeader(aFile, aOffsets, aNumTables) {
+ // sfnt version (4 bytes)
+ var version = [0x4F, 0x54, 0x54, 0X4F];
+
+ // numTables (2 bytes)
+ var numTables = aNumTables;
+
+ // searchRange (2 bytes)
+ var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
+ var searchRange = tablesMaxPower2 * 16;
+
+ // entrySelector (2 bytes)
+ var entrySelector = Math.log(tablesMaxPower2) / Math.log(2);
+
+ // rangeShift (2 bytes)
+ var rangeShift = numTables * 16 - searchRange;
+
+ var header = [].concat(version,
+ FontsUtils.integerToBytes(numTables, 2),
+ FontsUtils.integerToBytes(searchRange, 2),
+ FontsUtils.integerToBytes(entrySelector, 2),
+ FontsUtils.integerToBytes(rangeShift, 2));
+ aFile.set(header, aOffsets.currentOffset);
+ aOffsets.currentOffset += header.length;
+ aOffsets.virtualOffset += header.length;
+ },
+
+ _createTableEntry: function font_createTableEntry(aFile, aOffsets, aTag, aData) {
+ // tag
+ var tag = [
+ aTag.charCodeAt(0),
+ aTag.charCodeAt(1),
+ aTag.charCodeAt(2),
+ aTag.charCodeAt(3)
+ ];
+
+ // offset
+ var offset = aOffsets.virtualOffset;
+
+ // Per spec tables must be 4-bytes align so add some 0x00 if needed
+ while (aData.length & 3)
+ aData.push(0x00);
+
+ // length
+ var length = aData.length;
+
+ // checksum
+ var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
+
+ var tableEntry = [].concat(tag,
+ FontsUtils.integerToBytes(checksum, 4),
+ FontsUtils.integerToBytes(offset, 4),
+ FontsUtils.integerToBytes(length, 4));
+ aFile.set(tableEntry, aOffsets.currentOffset);
+ aOffsets.currentOffset += tableEntry.length;
+ aOffsets.virtualOffset += aData.length;
+ },
+
+ _createCMAPTable: function font_createCMAPTable(aGlyphs) {
+ var characters = new Uint16Array(kMaxGlyphsCount);
+ for (var i = 0; i < aGlyphs.length; i++)
+ characters[aGlyphs[i].unicode] = i + 1;
+
+ // Separate the glyphs into continuous range of codes, aka segment.
+ var ranges = [];
+ var range = [];
+ var count = characters.length;
+ for (var i = 0; i < count; i++) {
+ if (characters[i]) {
+ range.push(i);
+ } else if (range.length) {
+ ranges.push(range.slice());
+ range = [];
+ }
+ }
+
+ // The size in bytes of the header is equal to the size of the
+ // different fields * length of a short + (size of the 4 parallels arrays
+ // describing segments * length of a short).
+ var headerSize = (12 * 2 + (ranges.length * 4 * 2));
+
+ var segCount = ranges.length + 1;
+ var segCount2 = segCount * 2;
+ var searchRange = FontsUtils.getMaxPower2(segCount) * 2;
+ var searchEntry = Math.log(segCount) / Math.log(2);
+ var rangeShift = 2 * segCount - searchRange;
+ var cmap = [].concat(
+ [
+ 0x00, 0x00, // version
+ 0x00, 0x01, // numTables
+ 0x00, 0x03, // platformID
+ 0x00, 0x01, // encodingID
+ 0x00, 0x00, 0x00, 0x0C, // start of the table record
+ 0x00, 0x04 // format
+ ],
+ FontsUtils.integerToBytes(headerSize, 2), // length
+ [0x00, 0x00], // language
+ FontsUtils.integerToBytes(segCount2, 2),
+ FontsUtils.integerToBytes(searchRange, 2),
+ FontsUtils.integerToBytes(searchEntry, 2),
+ FontsUtils.integerToBytes(rangeShift, 2)
+ );
+
+ // Fill up the 4 parallel arrays describing the segments.
+ var startCount = [];
+ var endCount = [];
+ var idDeltas = [];
+ var idRangeOffsets = [];
+ var glyphsIdsArray = [];
+ var bias = 0;
+ for (var i = 0; i < segCount - 1; i++) {
+ var range = ranges[i];
+ var start = FontsUtils.integerToBytes(range[0], 2);
+ var end = FontsUtils.integerToBytes(range[range.length - 1], 2);
+
+ var delta = FontsUtils.integerToBytes(((range[0] - 1) - bias) % 65536, 2);
+ bias += range.length;
+
+ // deltas are signed shorts
+ delta[0] ^= 0xFF;
+ delta[1] ^= 0xFF;
+ delta[1] += 1;
+
+ startCount.push(start[0], start[1]);
+ endCount.push(end[0], end[1]);
+ idDeltas.push(delta[0], delta[1]);
+ idRangeOffsets.push(0x00, 0x00);
+
+ for (var j = 0; j < range.length; j++)
+ glyphsIdsArray.push(range[j]);
+ }
+ startCount.push(0xFF, 0xFF);
+ endCount.push(0xFF, 0xFF);
+ idDeltas.push(0x00, 0x01);
+ idRangeOffsets.push(0x00, 0x00);
+
+ return cmap.concat(endCount, [0x00, 0x00], startCount,
+ idDeltas, idRangeOffsets, glyphsIdsArray);
+ },
+
+ cover: function font_cover(aFont) {
+ var otf = new Uint8Array(kMaxFontFileSize);
+
+ // Required Tables
+ var CFF = aFont.data, // PostScript Font Program
+ OS2 = [], // OS/2 and Windows Specific metrics
+ cmap = [], // Character to glyphs mapping
+ head = [], // Font eader
+ hhea = [], // Horizontal header
+ hmtx = [], // Horizontal metrics
+ maxp = [], // Maximum profile
+ name = [], // Naming tables
+ post = []; // PostScript informations
+ var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
+
+ // The offsets object holds at the same time a representation of where
+ // to write the table entry information about a table and another offset
+ // representing the offset where to draw the actual data of a particular
+ // table
+ var offsets = {
+ currentOffset: 0,
+ virtualOffset: tables.length * (4 * 4)
+ };
+
+ // For files with only one font the offset table is the first thing of the
+ // file
+ this._createOpenTypeHeader(otf, offsets, tables.length);
+
+ // XXX It is probable that in a future we want to get rid of this glue
+ // between the CFF and the OTF format in order to be able to embed TrueType
+ // data.
+ this._createTableEntry(otf, offsets, "CFF ", CFF);
+
+ /** OS/2 */
+ OS2 = [
+ 0x00, 0x03, // version
+ 0x02, 0x24, // xAvgCharWidth
+ 0x01, 0xF4, // usWeightClass
+ 0x00, 0x05, // usWidthClass
+ 0x00, 0x00, // fstype
+ 0x02, 0x8A, // ySubscriptXSize
+ 0x02, 0xBB, // ySubscriptYSize
+ 0x00, 0x00, // ySubscriptXOffset
+ 0x00, 0x8C, // ySubscriptYOffset
+ 0x02, 0x8A, // ySuperScriptXSize
+ 0x02, 0xBB, // ySuperScriptYSize
+ 0x00, 0x00, // ySuperScriptXOffset
+ 0x01, 0xDF, // ySuperScriptYOffset
+ 0x00, 0x31, // yStrikeOutSize
+ 0x01, 0x02, // yStrikeOutPosition
+ 0x00, 0x00, // sFamilyClass
+ 0x02, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Panose
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 0-31)
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 32-63)
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 64-95)
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 96-127)
+ 0x2A, 0x32, 0x31, 0x2A, // achVendID
+ 0x00, 0x20, // fsSelection
+ 0x00, 0x2D, // usFirstCharIndex
+ 0x00, 0x7A, // usLastCharIndex
+ 0x00, 0x03, // sTypoAscender
+ 0x00, 0x20, // sTypeDescender
+ 0x00, 0x38, // sTypoLineGap
+ 0x00, 0x5A, // usWinAscent
+ 0x02, 0xB4, // usWinDescent
+ 0x00, 0xCE, 0x00, 0x00, // ulCodePageRange1 (Bits 0-31)
+ 0x00, 0x01, 0x00, 0x00, // ulCodePageRange2 (Bits 32-63)
+ 0x00, 0x00, // sxHeight
+ 0x00, 0x00, // sCapHeight
+ 0x00, 0x01, // usDefaultChar
+ 0x00, 0xCD, // usBreakChar
+ 0x00, 0x02 // usMaxContext
+ ];
+ this._createTableEntry(otf, offsets, "OS/2", OS2);
+
+ //XXX Getting charstrings here seems wrong since this is another CFF glue
+ var charstrings = aFont.getOrderedCharStrings(aFont.glyphs);
+
+ /** CMAP */
+ cmap = this._createCMAPTable(charstrings);
+ this._createTableEntry(otf, offsets, "cmap", cmap);
+
+ /** HEAD */
+ head = [
+ 0x00, 0x01, 0x00, 0x00, // Version number
+ 0x00, 0x00, 0x50, 0x00, // fontRevision
+ 0x00, 0x00, 0x00, 0x00, // checksumAdjustement
+ 0x5F, 0x0F, 0x3C, 0xF5, // magicNumber
+ 0x00, 0x00, // Flags
+ 0x03, 0xE8, // unitsPerEM (defaulting to 1000)
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // creation date
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // modifification date
+ 0x00, 0x00, // xMin
+ 0x00, 0x00, // yMin
+ 0x00, 0x00, // xMax
+ 0x00, 0x00, // yMax
+ 0x00, 0x00, // macStyle
+ 0x00, 0x00, // lowestRecPPEM
+ 0x00, 0x00, // fontDirectionHint
+ 0x00, 0x00, // indexToLocFormat
+ 0x00, 0x00 // glyphDataFormat
+ ];
+ this._createTableEntry(otf, offsets, "head", head);
+
+ /** HHEA */
+ hhea = [].concat(
+ [
+ 0x00, 0x01, 0x00, 0x00, // Version number
+ 0x00, 0x00, // Typographic Ascent
+ 0x00, 0x00, // Typographic Descent
+ 0x00, 0x00, // Line Gap
+ 0xFF, 0xFF, // advanceWidthMax
+ 0x00, 0x00, // minLeftSidebearing
+ 0x00, 0x00, // minRightSidebearing
+ 0x00, 0x00, // xMaxExtent
+ 0x00, 0x00, // caretSlopeRise
+ 0x00, 0x00, // caretSlopeRun
+ 0x00, 0x00, // caretOffset
+ 0x00, 0x00, // -reserved-
+ 0x00, 0x00, // -reserved-
+ 0x00, 0x00, // -reserved-
+ 0x00, 0x00, // -reserved-
+ 0x00, 0x00 // metricDataFormat
+ ],
+ FontsUtils.integerToBytes(charstrings.length, 2) // numberOfHMetrics
+ );
+ this._createTableEntry(otf, offsets, "hhea", hhea);
+
+ /** HMTX */
+ hmtx = [0x01, 0xF4, 0x00, 0x00];
+ for (var i = 0; i < charstrings.length; i++) {
+ var charstring = charstrings[i].charstring;
+ var width = FontsUtils.integerToBytes(charstring[1], 2);
+ var lsb = FontsUtils.integerToBytes(charstring[0], 2);
+ hmtx = hmtx.concat(width, lsb);
+ }
+ this._createTableEntry(otf, offsets, "hmtx", hmtx);
+
+ /** MAXP */
+ maxp = [].concat(
+ [
+ 0x00, 0x00, 0x50, 0x00, // Version number
+ ],
+ FontsUtils.integerToBytes(charstrings.length + 1, 2) // Num of glyphs (+1 to pass the sanitizer...)
+ );
+ this._createTableEntry(otf, offsets, "maxp", maxp);
+
+ /** NAME */
+ name = [
+ 0x00, 0x00, // format
+ 0x00, 0x00, // Number of names Record
+ 0x00, 0x00 // Storage
+ ];
+ this._createTableEntry(otf, offsets, "name", name);
+
+ /** POST */
+ // FIXME Get those informations from the FontInfo structure
+ post = [
+ 0x00, 0x03, 0x00, 0x00, // Version number
+ 0x00, 0x00, 0x01, 0x00, // italicAngle
+ 0x00, 0x00, // underlinePosition
+ 0x00, 0x00, // underlineThickness
+ 0x00, 0x00, 0x00, 0x00, // isFixedPitch
+ 0x00, 0x00, 0x00, 0x00, // minMemType42
+ 0x00, 0x00, 0x00, 0x00, // maxMemType42
+ 0x00, 0x00, 0x00, 0x00, // minMemType1
+ 0x00, 0x00, 0x00, 0x00 // maxMemType1
+ ];
+ this._createTableEntry(otf, offsets, "post", post);
+
+ // Once all the table entries header are written, dump the data!
+ var tables = [CFF, OS2, cmap, head, hhea, hmtx, maxp, name, post];
+ for (var i = 0; i < tables.length; i++) {
+ var table = tables[i];
+ otf.set(table, offsets.currentOffset);
+ offsets.currentOffset += table.length;
+ }
+
+ var fontData = [];
+ for (var i = 0; i < offsets.currentOffset; i++)
+ fontData.push(otf[i]);
+ return fontData;
+ }
+};
+
+
+/**
+ * FontsUtils is a static class dedicated to hold codes that are not related
+ * to fonts in particular and needs to be share between them.
+ */
+var FontsUtils = {
+ _bytesArray: new Uint8Array(4),
+ integerToBytes: function fu_integerToBytes(aValue, aBytesCount) {
+ var bytes = this._bytesArray;
+
+ if (aBytesCount == 1) {
+ bytes.set([aValue]);
+ return bytes[0];
+ } else if (aBytesCount == 2) {
+ bytes.set([aValue >> 8, aValue]);
+ return [bytes[0], bytes[1]];
+ } else if (aBytesCount == 4) {
+ bytes.set([aValue >> 24, aValue >> 16, aValue >> 8, aValue]);
+ return [bytes[0], bytes[1], bytes[2], bytes[3]];
+ }
+ },
+
+ bytesToInteger: function fu_bytesToInteger(aBytesArray) {
+ var value = 0;
+ for (var i = 0; i < aBytesArray.length; i++)
+ value = (value << 8) + aBytesArray[i];
+ return value;
+ },
+
+ getMaxPower2: function fu_getMaxPower2(aNumber) {
+ var maxPower = 0;
+ var value = aNumber;
+ while (value >= 2) {
+ value /= 2;
+ maxPower++;
+ }
+
+ value = 2;
+ for (var i = 1; i < maxPower; i++)
+ value *= 2;
+ return value;
+ }
+};
+
+
+/**
+ * The TrueType class verify that the ttf embedded inside the PDF is correct in
+ * the point of view of the OTS sanitizer and rewrite it on the fly otherwise.
+ *
+ * At the moment the rewiting only support rewriting missing 'OS/2' table.
+ * This class is unused at the moment since the 'cmap' table of the test
+ * document is not missing but use and old version of the 'cmap' table that
+ * is deprecated and not supported by the sanitizer...
+ *
+ */
+var TrueType = function(aFile) {
+ var header = this._readOpenTypeHeader(aFile);
+ var numTables = header.numTables;
+
+ // Check that required tables are present
+ var requiredTables = [
+ "OS/2",
+ "cmap",
+ "head",
+ "hhea",
+ "hmtx",
+ "maxp",
+ "name",
+ "post"
+ ];
+
+ var tables = [];
+ for (var i = 0; i < numTables; i++) {
+ var table = this._readTableEntry(aFile);
+ var index = requiredTables.indexOf(table.tag);
+ if (index != -1)
+ requiredTables.splice(index, 1);
+
+ tables.push(table);
+ }
+
+ // Tables needs to be written by ascendant alphabetic order
+ tables.sort(function(a, b) {
+ return a.tag > b.tag;
+ });
+
+ // If any tables are still in the array this means some required tables are
+ // missing, which means that we need to rebuild the font in order to pass
+ // the sanitizer.
+ if (requiredTables.length && requiredTables[0] == "OS/2") {
+ OS2 = [
+ 0x00, 0x03, // version
+ 0x02, 0x24, // xAvgCharWidth
+ 0x01, 0xF4, // usWeightClass
+ 0x00, 0x05, // usWidthClass
+ 0x00, 0x00, // fstype
+ 0x02, 0x8A, // ySubscriptXSize
+ 0x02, 0xBB, // ySubscriptYSize
+ 0x00, 0x00, // ySubscriptXOffset
+ 0x00, 0x8C, // ySubscriptYOffset
+ 0x02, 0x8A, // ySuperScriptXSize
+ 0x02, 0xBB, // ySuperScriptYSize
+ 0x00, 0x00, // ySuperScriptXOffset
+ 0x01, 0xDF, // ySuperScriptYOffset
+ 0x00, 0x31, // yStrikeOutSize
+ 0x01, 0x02, // yStrikeOutPosition
+ 0x00, 0x00, // sFamilyClass
+ 0x02, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Panose
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 0-31)
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 32-63)
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 64-95)
+ 0xFF, 0xFF, 0xFF, 0xFF, // ulUnicodeRange1 (Bits 96-127)
+ 0x2A, 0x32, 0x31, 0x2A, // achVendID
+ 0x00, 0x20, // fsSelection
+ 0x00, 0x2D, // usFirstCharIndex
+ 0x00, 0x7A, // usLastCharIndex
+ 0x00, 0x03, // sTypoAscender
+ 0x00, 0x20, // sTypeDescender
+ 0x00, 0x38, // sTypoLineGap
+ 0x00, 0x5A, // usWinAscent
+ 0x02, 0xB4, // usWinDescent
+ 0x00, 0xCE, 0x00, 0x00, // ulCodePageRange1 (Bits 0-31)
+ 0x00, 0x01, 0x00, 0x00, // ulCodePageRange2 (Bits 32-63)
+ 0x00, 0x00, // sxHeight
+ 0x00, 0x00, // sCapHeight
+ 0x00, 0x01, // usDefaultChar
+ 0x00, 0xCD, // usBreakChar
+ 0x00, 0x02 // usMaxContext
+ ];
+
+ // Create a new file to hold the new version of our truetype with a new
+ // header and new offsets
+ var stream = aFile.stream || aFile;
+ var ttf = new Uint8Array(stream.length + 16 + OS2.length);
+
+ // The new numbers of tables will be the last one plus the num of missing
+ // tables
+ var numTables = header.numTables + 1;
+
+ // The offsets object holds at the same time a representation of where
+ // to write the table entry information about a table and another offset
+ // representing the offset where to draw the actual data of a particular
+ // table
+ var offsets = {
+ currentOffset: 0,
+ virtualOffset: numTables * (4 * 4)
+ };
+
+ // Write the sfnt header with one more table
+ this._createOpenTypeHeader(ttf, offsets, numTables);
+
+ // Insert the missing table
+ tables.unshift({
+ tag: "OS/2",
+ data: OS2
+ });
+
+ // rewrite the tables but tweak offsets
+ for (var i = 0; i < tables.length; i++) {
+ var table = tables[i];
+ var data = [];
+
+ var tableData = table.data;
+ for (var j = 0; j < tableData.length; j++)
+ data.push(tableData[j]);
+ this._createTableEntry(ttf, offsets, table.tag, data);
+ }
+
+ // Add the table datas
+ for (var i = 0; i < tables.length; i++) {
+ var table = tables[i];
+ var tableData = table.data;
+ ttf.set(tableData, offsets.currentOffset);
+ offsets.currentOffset += tableData.length;
+
+ if (0) {
+ var data = [];
+ for (var j = 0; j < tableData.length; j++)
+ d.push(tableData[j]);
+ log("data for table: " + table.tag + ": " + data);
+ }
+
+ // 4-byte aligned data
+ while (offsets.currentOffset & 3)
+ offsets.currentOffset++;
+ }
+
+ var fontData = [];
+ for (var i = 0; i < ttf.length; i++)
+ fontData.push(ttf[i]);
+
+ this.data = ttf;
+ return;
+ } else if (requiredTables.lenght) {
+ error("Table " + requiredTables[0] + " is missing from the TruType font");
+ } else {
+ this.data = aFile;
+ }
+};
+
+TrueType.prototype = {
+ _createOpenTypeHeader: function tt_createOpenTypeHeader(aFile, aOffsets, aNumTables) {
+ // sfnt version (4 bytes)
+ // XXX if we want to merge this function and the one from the Font class
+ // XXX this need to be adapted
+ var version = [0x00, 0x01, 0x00, 0X00];
+
+ // numTables (2 bytes)
+ var numTables = aNumTables;
+
+ // searchRange (2 bytes)
+ var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
+ var searchRange = tablesMaxPower2 * 16;
+
+ // entrySelector (2 bytes)
+ var entrySelector = Math.log(tablesMaxPower2) / Math.log(2);
+
+ // rangeShift (2 bytes)
+ var rangeShift = numTables * 16 - searchRange;
+
+ var header = [].concat(version,
+ FontsUtils.integerToBytes(numTables, 2),
+ FontsUtils.integerToBytes(searchRange, 2),
+ FontsUtils.integerToBytes(entrySelector, 2),
+ FontsUtils.integerToBytes(rangeShift, 2));
+ aFile.set(header, aOffsets.currentOffset);
+ aOffsets.currentOffset += header.length;
+ aOffsets.virtualOffset += header.length;
+ },
+
+ _createTableEntry: function font_createTableEntry(aFile, aOffsets, aTag, aData) {
+ // tag
+ var tag = [
+ aTag.charCodeAt(0),
+ aTag.charCodeAt(1),
+ aTag.charCodeAt(2),
+ aTag.charCodeAt(3)
+ ];
+
+ // Per spec tables must be 4-bytes align so add some 0x00 if needed
+ while (aData.length & 3)
+ aData.push(0x00);
+
+ while (aOffsets.virtualOffset & 3)
+ aOffsets.virtualOffset++;
+
+ // offset
+ var offset = aOffsets.virtualOffset;
+
+ // length
+ var length = aData.length;
+
+ // checksum
+ var checksum = FontsUtils.bytesToInteger(tag) + offset + length;
+
+ var tableEntry = [].concat(tag,
+ FontsUtils.integerToBytes(checksum, 4),
+ FontsUtils.integerToBytes(offset, 4),
+ FontsUtils.integerToBytes(length, 4));
+ aFile.set(tableEntry, aOffsets.currentOffset);
+ aOffsets.currentOffset += tableEntry.length;
+ aOffsets.virtualOffset += aData.length;
+ },
+
+ _readOpenTypeHeader: function tt_readOpenTypeHeader(aFile) {
+ return {
+ version: aFile.getBytes(4),
+ numTables: FontsUtils.bytesToInteger(aFile.getBytes(2)),
+ searchRange: FontsUtils.bytesToInteger(aFile.getBytes(2)),
+ entrySelector: FontsUtils.bytesToInteger(aFile.getBytes(2)),
+ rangeShift: FontsUtils.bytesToInteger(aFile.getBytes(2))
+ }
+ },
+
+ _readTableEntry: function tt_readTableEntry(aFile) {
+ // tag
+ var tag = aFile.getBytes(4);
+ tag = String.fromCharCode(tag[0]) +
+ String.fromCharCode(tag[1]) +
+ String.fromCharCode(tag[2]) +
+ String.fromCharCode(tag[3]);
+
+ var checksum = FontsUtils.bytesToInteger(aFile.getBytes(4));
+ var offset = FontsUtils.bytesToInteger(aFile.getBytes(4));
+ var length = FontsUtils.bytesToInteger(aFile.getBytes(4));
+
+ // Read the table associated data
+ var currentPosition = aFile.pos;
+ aFile.pos = aFile.start + offset;
+ var data = aFile.getBytes(length);
+ aFile.pos = currentPosition;
+
+ return {
+ tag: tag,
+ checksum: checksum,
+ length: offset,
+ offset: length,
+ data: data
+ }
+ }
+};
+
+
+/**
+ * This dictionary holds decoded fonts data.
+ */
+var Type1Parser = function() {
+ // Turn on this flag for additional debugging logs
+ var debug = false;
+
+ var dump = function(aData) {
+ if (debug)
+ log(aData);
+ };
+
+ /*
+ * Decrypt a Sequence of Ciphertext Bytes to Produce the Original Sequence
+ * of Plaintext Bytes. The function took a key as a parameter which can be
+ * for decrypting the eexec block of for decoding charStrings.
+ */
+ var kEexecEncryptionKey = 55665;
+ var kCharStringsEncryptionKey = 4330;
+
+ function decrypt(aStream, aKey, aDiscardNumber, aByteArray) {
+ var start = Date.now();
+ var r = aKey, c1 = 52845, c2 = 22719;
+ var decryptedString = [];
+
+ var value = "";
+ var count = aStream.length;
+ for (var i = 0; i < count; i++) {
+ value = aStream[i];
+ if (aByteArray)
+ decryptedString[i] = value ^ (r >> 8);
+ else
+ decryptedString[i] = String.fromCharCode(value ^ (r >> 8));
+ r = ((value + r) * c1 + c2) & ((1 << 16) - 1);
+ }
+ var end = Date.now();
+ dump("Time to decrypt string of length " + count + " is " + (end - start));
+ return decryptedString.slice(aDiscardNumber);
+ };
+
+ /*
+ * CharStrings are encoded following the the CharString Encoding sequence
+ * describe in Chapter 6 of the "Adobe Type1 Font Format" specification.
+ * The value in a byte indicates a command, a number, or subsequent bytes
+ * that are to be interpreted in a special way.
+ *
+ * CharString Number Encoding:
+ * A CharString byte containing the values from 32 through 255 inclusive
+ * indicate an integer. These values are decoded in four ranges.
+ *
+ * 1. A CharString byte containing a value, v, between 32 and 246 inclusive,
+ * indicate the integer v - 139. Thus, the integer values from -107 through
+ * 107 inclusive may be encoded in single byte.
+ *
+ * 2. A CharString byte containing a value, v, between 247 and 250 inclusive,
+ * indicates an integer involving the next byte, w, according to the formula:
+ * [(v - 247) x 256] + w + 108
+ *
+ * 3. A CharString byte containing a value, v, between 251 and 254 inclusive,
+ * indicates an integer involving the next byte, w, according to the formula:
+ * -[(v - 251) * 256] - w - 108
+ *
+ * 4. A CharString containing the value 255 indicates that the next 4 bytes
+ * are a two complement signed integer. The first of these bytes contains the
+ * highest order bits, the second byte contains the next higher order bits
+ * and the fourth byte contain the lowest order bits.
+ *
+ *
+ * CharString Command Encoding:
+ * CharStrings commands are encoded in 1 or 2 bytes.
+ *
+ * Single byte commands are encoded in 1 byte that contains a value between
+ * 0 and 31 inclusive.
+ * If a command byte contains the value 12, then the value in the next byte
+ * indicates a command. This "escape" mechanism allows many extra commands
+ * to be encoded and this encoding technique helps to minimize the length of
+ * the charStrings.
+ */
+ var charStringDictionary = {
+ "1": "hstem",
+ "3": "vstem",
+ "4": "vmoveto",
+ "5": "rlineto",
+ "6": "hlineto",
+ "7": "vlineto",
+ "8": "rrcurveto",
+
+ // closepath is a Type1 command that do not take argument and is useless
+ // in Type2 and it can simply be ignored.
+ "9": null, // closepath
+
+ "10": "callsubr",
+
+ // return is normally used inside sub-routines to tells to the execution
+ // flow that it can be back to normal.
+ // During the translation process Type1 charstrings will be flattened and
+ // sub-routines will be embedded directly into the charstring directly, so
+ // this can be ignored safely.
+ "11": "return",
+
+ "12": {
+ // dotsection is a Type1 command to specify some hinting feature for dots
+ // that do not take a parameter and it can safely be ignored for Type2.
+ "0": null, // dotsection
+
+ // [vh]stem3 are Type1 only and Type2 supports [vh]stem with multiple
+ // parameters, so instead of returning [vh]stem3 take a shortcut and
+ // return [vhstem] instead.
+ "1": "vstem",
+ "2": "hstem",
+
+ // Type1 only command with command not (yet) built-in ,throw an error
+ "6": -1, // seac
+ "7": -1, //sbw
+
+ "12": "div",
+
+ // callothersubr is a mechanism to make calls on the postscript
+ // interpreter.
+ // TODO When decodeCharstring encounter such a command it should
+ // directly do:
+ // - pop the previous charstring[] command into 'index'
+ // - pop the previous charstring[] command and ignore it, it is
+ // normally the number of element to push on the stack before
+ // the command but since everything will be pushed on the stack
+ // by the PS interpreter when it will read them that is safe to
+ // ignore this command
+ // - push the content of the OtherSubrs[index] inside charstring[]
+ "16": "callothersubr",
+
+ "17": "pop",
+
+ // setcurrentpoint sets the current point to x, y without performing a
+ // moveto (this is a one shot positionning command). This is used only
+ // with the return of an OtherSubrs call.
+ // TODO Implement the OtherSubrs charstring embedding and replace this
+ // call by a no-op, like 2 'pop' commands for example.
+ "33": null, //setcurrentpoint
+ },
+ "13": "hsbw",
+ "14": "endchar",
+ "21": "rmoveto",
+ "22": "hmoveto",
+ "30": "vhcurveto",
+ "31": "hvcurveto"
+ };
+
+ function decodeCharString(aArray) {
+ var charString = [];
+
+ var value = "";
+ var count = aArray.length;
+ for (var i = 0; i < count; i++) {
+ value = parseInt(aArray[i]);
+
+ if (value < 32) {
+ var command = null;
+ if (value == 12) {
+ var escape = aArray[++i];
+ command = charStringDictionary["12"][escape];
+ } else {
+ command = charStringDictionary[value];
+ }
+
+ // Some charstring commands are meaningless in Type2 and will return
+ // a null, let's just ignored them
+ if (!command && i < count) {
+ continue;
+ } else if (!command) {
+ break;
+ } else if (command == -1) {
+ log("decodeCharstring: " + charString);
+ error("Support for Type1 command " + value + " (" + escape + ") is not implemented");
+ }
+
+ value = command;
+ } else if (value <= 246) {
+ value = parseInt(value) - 139;
+ } else if (value <= 250) {
+ value = ((value - 247) * 256) + parseInt(aArray[++i]) + 108;
+ } else if (value <= 254) {
+ value = -((value - 251) * 256) - parseInt(aArray[++i]) - 108;
+ } else {
+ var byte = aArray[++i];
+ var high = (byte >> 1);
+ value = (byte - high) << 24 | aArray[++i] << 16 |
+ aArray[++i] << 8 | aArray[++i];
+ }
+
+ charString.push(value);
+ }
+
+ return charString;
+ };
+
+ /**
+ * Returns an object containing a Subrs array and a CharStrings array
+ * extracted from and eexec encrypted block of data
+ */
+ this.extractFontInfo = function(aStream) {
+ var eexecString = decrypt(aStream, kEexecEncryptionKey, 4, true);
+ var subrs = [], glyphs = [];
+ var inSubrs = inGlyphs = false;
+ var glyph = "";
+
+ var token = "";
+ var index = 0;
+ var length = 0;
+
+ var count = eexecString.length;
+ var c = "";
+ for (var i = 0; i < count; i++) {
+ var c = eexecString[i];
+
+ if (inSubrs && c == 0x52) {
+ length = parseInt(length);
+ var data = eexecString.slice(i + 3, i + 3 + length);
+ var encodedSubr = decrypt(data, kCharStringsEncryptionKey, 4, true);
+ var subr = decodeCharString(encodedSubr);
+
+ subrs.push(subr);
+ i += 3 + length;
+ } else if (inGlyphs && c == 0x52) {
+ length = parseInt(length);
+ var data = eexecString.slice(i + 3, i + 3 + length);
+ var encodedCharstring = decrypt(data, kCharStringsEncryptionKey, 4, true);
+ var subr = decodeCharString(encodedCharstring);
+
+ glyphs.push({
+ glyph: glyph,
+ data: subr
+ });
+ i += 3 + length;
+ } else if (inGlyphs && c == 0x2F) {
+ token = "";
+ glyph = "";
+
+ while ((c = eexecString[++i]) != 0x20)
+ glyph += String.fromCharCode(c);
+ } else if (!inSubrs && !inGlyphs && c == 0x2F && eexecString[i+1] == 0x53) {
+ while ((c = eexecString[++i]) != 0x20) {};
+ inSubrs = true;
+ } else if (c == 0x20) {
+ index = length;
+ length = token;
+ token = "";
+ } else if (c == 0x2F && eexecString[i+1] == 0x43 && eexecString[i+2] == 0x68) {
+ while ((c = eexecString[++i]) != 0x20) {};
+ inSubrs = false;
+ inGlyphs = true;
+ } else {
+ token += String.fromCharCode(c);
+ }
+ }
+ return {
+ subrs: subrs,
+ charstrings: glyphs
+ }
+ }
+};
+
+var CFF = function(aFontName, aFontBBox, aFontFile) {
+ // Get the data block containing glyphs and subrs informations
+ var length1 = aFontFile.dict.get("Length1");
+ var length2 = aFontFile.dict.get("Length2");
+ aFontFile.skip(length1);
+ var eexecBlock = aFontFile.getBytes(length2);
+
+ // Extract informations from it
+ var start = Date.now();
+ var parser = new Type1Parser();
+ var fontInfo = parser.extractFontInfo(eexecBlock);
+ fontInfo.name = aFontName;
+ fontInfo.bbox = aFontBBox;
+
+ // XXX This hold the glyph data as if, this should be improved
+ this.glyphs = fontInfo.charstrings;
+
+ this.data = this.convertToCFF(fontInfo);
+ var end = Date.now();
+};
+
+CFF.prototype = {
+ createCFFIndexHeader: function(aObjects, aIsByte) {
+ var data = [];
+
+ // First 2 bytes contains the number of objects contained into this index
+ var count = aObjects.length;
+ if (count ==0)
+ return [0x00, 0x00, 0x00];
+
+ var bytes = FontsUtils.integerToBytes(count, 2);
+ for (var i = 0; i < bytes.length; i++)
+ data.push(bytes[i]);
+
+ // Next byte contains the offset size use to reference object in the file
+ // Actually we're using 0x04 to be sure to be able to store everything
+ // without thinking of it while coding.
+ data.push(0x04);
+
+ // Add another offset after this one because we need a new offset
+ var relativeOffset = 1;
+ for (var i = 0; i < count + 1; i++) {
+ var bytes = FontsUtils.integerToBytes(relativeOffset, 4);
+ for (var j = 0; j < bytes.length; j++)
+ data.push(bytes[j]);
+
+ if (aObjects[i])
+ relativeOffset += aObjects[i].length;
+ }
+
+ for (var i =0; i < count; i++) {
+ for (var j = 0; j < aObjects[i].length; j++)
+ data.push(aIsByte ? aObjects[i][j] : aObjects[i].charCodeAt(j));
+ }
+ return data;
+ },
+
+ encodeNumber: function(aValue) {
+ var x = 0;
+ if (aValue >= -32768 && aValue <= 32767) {
+ return [ 28, aValue >> 8, aValue ];
+ } else if (aValue >= (-2147483647-1) && aValue <= 2147483647) {
+ return [
+ 0xFF, aValue >> 24, Value >> 16, aValue >> 8, aValue ];
+ } else {
+ error("Value: " + aValue + " is not allowed");
+ }
+ },
+
+ getOrderedCharStrings: function(aGlyphs) {
+ var charstrings = [];
+
+ for (var i = 0; i < aGlyphs.length; i++) {
+ var glyph = aGlyphs[i].glyph;
+ var unicode = GlyphsUnicode[glyph];
+ if (!unicode) {
+ if (glyph != ".notdef")
+ warn(glyph + " does not have an entry in the glyphs unicode dictionary");
+ } else {
+ var b1 = parseInt("0x" + unicode[0] + unicode[1]);
+ var b2 = parseInt("0x" + unicode[2] + unicode[3]);
+ unicode = FontsUtils.bytesToInteger([b1, b2]);
+
+ charstrings.push({
+ glyph: glyph,
+ unicode: unicode,
+ charstring: aGlyphs[i].data.slice()
+ });
+ }
+ };
+
+ charstrings.sort(function(a, b) {
+ return a.unicode > b.unicode;
+ });
+ return charstrings;
+ },
+
+ /*
+ * Flatten the commands by interpreting the postscript code and replacing
+ * every 'callsubr', 'callothersubr' by the real commands.
+ *
+ * TODO This function also do a string to command number transformation
+ * that can probably be avoided if the Type1 decodeCharstring code is smarter
+ */
+ commandsMap: {
+ "hstem": 1,
+ "vstem": 3,
+ "vmoveto": 4,
+ "rlineto": 5,
+ "hlineto": 6,
+ "vlineto": 7,
+ "rrcurveto": 8,
+ "endchar": 14,
+ "rmoveto": 21,
+ "hmoveto": 22,
+ "vhcurveto": 30,
+ "hvcurveto": 31,
+ },
+
+ flattenCharstring: function(aGlyph, aCharstring, aSubrs) {
+ var original = aCharstring.slice();
+ var i = 0;
+ while (true) {
+ var obj = aCharstring[i];
+ if (obj == null)
+ return [];
+
+ if (obj.charAt) {
+ switch (obj) {
+ case "callsubr":
+ var subr = aSubrs[aCharstring[i - 1]].slice();
+ if (subr.length > 1) {
+ subr = this.flattenCharstring(aGlyph, subr, aSubrs);
+ subr.pop();
+ aCharstring.splice(i - 1, 2, subr);
+ } else {
+ aCharstring.splice(i - 1, 2);
+ }
+ i -= 1;
+ break;
+
+ case "callothersubr":
+ var index = aCharstring[i - 1];
+ var count = aCharstring[i - 2];
+ var data = aCharstring[i - 3];
+
+ // XXX The callothersubr needs to support at least the 3 defaults
+ // otherSubrs of the spec
+ if (index != 3)
+ error("callothersubr for index: " + index + " (" + aCharstring + ")");
+
+ if (!data) {
+ aCharstring.splice(i - 2, 4, "pop", 3);
+ i -= 3;
+ } else {
+ // 5 to remove the arguments, the callothersubr call and the pop command
+ aCharstring.splice(i - 3, 5, 3);
+ i -= 3;
+ }
+ break;
+
+ case "div":
+ var num2 = aCharstring[i - 1];
+ var num1 = aCharstring[i - 2];
+ aCharstring.splice(i - 2, 3, num2 / num1);
+ i -= 2;
+ break;
+
+ case "pop":
+ if (i)
+ aCharstring.splice(i - 2, 2);
+ else
+ aCharstring.splice(i - 1, 1);
+ i -= 1;
+ break;
+
+
+ case "hsbw":
+ var charWidthVector = aCharstring[i - 1];
+ var leftSidebearing = aCharstring[i - 2];
+
+ if (leftSidebearing)
+ aCharstring.splice(i - 2, 3, charWidthVector, leftSidebearing, "hmoveto");
+ else
+ aCharstring.splice(i - 2, 3, charWidthVector);
+ break;
+
+ case "endchar":
+ case "return":
+ // CharString is ready to be re-encode to commands number at this point
+ for (var j = 0; j < aCharstring.length; j++) {
+ var command = aCharstring[j];
+ if (parseFloat(command) == command) {
+ aCharstring.splice(j, 1, 28, command >> 8, command);
+ j+= 2;
+ } else if (command.charAt) {
+ var command = this.commandsMap[command];
+ if (IsArray(command)) {
+ aCharstring.splice(j - 1, 1, command[0], command[1]);
+ j += 1;
+ } else {
+ aCharstring[j] = command;
+ }
+ } else {
+ aCharstring.splice(j, 1);
+
+ // command has already been translated, just add them to the
+ // charstring directly
+ for (var k = 0; k < command.length; k++)
+ aCharstring.splice(j + k, 0, command[k]);
+ j+= command.length - 1;
+ }
+ }
+ return aCharstring;
+
+ default:
+ break;
+ }
+ }
+ i++;
+ }
+ error("failing with i = " + i + " in charstring:" + aCharstring + "(" + aCharstring.length + ")");
+ },
+
+ convertToCFF: function(aFontInfo) {
+ var debug = false;
+ function dump(aMsg) {
+ if (debug)
+ log(aMsg);
+ };
+
+ var charstrings = this.getOrderedCharStrings(aFontInfo.charstrings);
+
+ // Starts the conversion of the Type1 charstrings to Type2
+ var start = Date.now();
+ var charstringsCount = 0;
+ var charstringsDataLength = 0;
+ var glyphs = [];
+ for (var i = 0; i < charstrings.length; i++) {
+ var charstring = charstrings[i].charstring.slice();
+ var glyph = charstrings[i].glyph;
+
+ var flattened = this.flattenCharstring(glyph, charstring, aFontInfo.subrs);
+ glyphs.push(flattened);
+ charstringsCount++;
+ charstringsDataLength += flattened.length;
+ }
+
+ var end = Date.now();
+ dump("There is " + charstringsCount + " glyphs (size: " + charstringsDataLength + ")");
+ dump("Time to flatten the strings is : " + (end -start));
+
+ // Create a CFF font data
+ var cff = new Uint8Array(kMaxFontFileSize);
+ var currentOffset = 0;
+
+ // Font header (major version, minor version, header size, offset size)
+ var header = [0x01, 0x00, 0x04, 0x04];
+ currentOffset += header.length;
+ cff.set(header);
+
+ // Names Index
+ var nameIndex = this.createCFFIndexHeader([aFontInfo.name]);
+ cff.set(nameIndex, currentOffset);
+ currentOffset += nameIndex.length;
+
+ // Calculate strings before writing the TopDICT index in order
+ // to calculate correct relative offsets for storing 'charset'
+ // and 'charstrings' data
+ var version = "";
+ var notice = "";
+ var fullName = "";
+ var familyName = "";
+ var weight = "";
+ var strings = [version, notice, fullName,
+ familyName, weight];
+ var stringsIndex = this.createCFFIndexHeader(strings);
+ var stringsDataLength = stringsIndex.length;
+
+ // Create the global subroutines index
+ var globalSubrsIndex = this.createCFFIndexHeader([]);
+
+ // Fill the charset header (first byte is the encoding)
+ var charset = [0x00];
+ for (var i = 0; i < glyphs.length; i++) {
+ var index = CFFStrings.indexOf(charstrings[i].glyph);
+ if (index == -1)
+ index = CFFStrings.length + strings.indexOf(glyph);
+ var bytes = FontsUtils.integerToBytes(index, 2);
+ charset.push(bytes[0]);
+ charset.push(bytes[1]);
+ }
+
+ var charstringsIndex = this.createCFFIndexHeader([[0x40, 0x0E]].concat(glyphs), true);
+ charstringsIndex = charstringsIndex.join(" ").split(" "); // XXX why?
+
+ //Top Dict Index
+ var topDictIndex = [
+ 0x00, 0x01, 0x01, 0x01, 0x30,
+ 248, 27, 0, // version
+ 248, 28, 1, // Notice
+ 248, 29, 2, // FullName
+ 248, 30, 3, // FamilyName
+ 248, 31, 4 // Weight
+ ];
+
+ var fontBBox = aFontInfo.bbox;
+ for (var i = 0; i < fontBBox.length; i++)
+ topDictIndex = topDictIndex.concat(this.encodeNumber(fontBBox[i]));
+ topDictIndex.push(5) // FontBBox;
+
+ var charsetOffset = currentOffset +
+ (topDictIndex.length + (4 + 4 + 4 + 7)) +
+ stringsIndex.length +
+ globalSubrsIndex.length;
+ topDictIndex = topDictIndex.concat(this.encodeNumber(charsetOffset));
+ topDictIndex.push(15); // charset
+
+ topDictIndex = topDictIndex.concat([28, 0, 0, 16]) // Encoding
+
+ var charstringsOffset = charsetOffset + (charstringsCount * 2) + 1;
+ topDictIndex = topDictIndex.concat(this.encodeNumber(charstringsOffset));
+ topDictIndex.push(17); // charstrings
+
+ topDictIndex = topDictIndex.concat([28, 0, 55])
+ var privateOffset = charstringsOffset + charstringsIndex.length;
+ topDictIndex = topDictIndex.concat(this.encodeNumber(privateOffset));
+ topDictIndex.push(18); // Private
+ topDictIndex = topDictIndex.join(" ").split(" ");
+
+ var indexes = [
+ topDictIndex, stringsIndex,
+ globalSubrsIndex, charset,
+ charstringsIndex
+ ];
+
+ for (var i = 0; i < indexes.length; i++) {
+ var index = indexes[i];
+ cff.set(index, currentOffset);
+ currentOffset += index.length;
+ }
+
+ // Private Data
+ var defaultWidth = this.encodeNumber(0);
+ var privateData = [].concat(
+ defaultWidth, [20],
+ [139, 21], // nominalWidth
+ [
+ 119, 159, 248, 97, 159, 247, 87, 159, 6,
+ 30, 10, 3, 150, 37, 255, 12, 9,
+ 139, 12,
+ 10, 172, 10,
+ 172, 150, 143, 146, 150, 146, 12, 12,
+ 247, 32, 11,
+ 247, 10, 161, 147, 154, 150, 143, 12, 13,
+ 139, 12, 14,
+ 28, 0, 55, 19
+ ]);
+ privateData = privateData.join(" ").split(" ");
+ cff.set(privateData, currentOffset);
+ currentOffset += privateData.length;
+
+ // Dump shit at the end of the file
+ var shit = [
+ 0x00, 0x01, 0x01, 0x01,
+ 0x13, 0x5D, 0x65, 0x64,
+ 0x5E, 0x5B, 0xAF, 0x66,
+ 0xBA, 0xBB, 0xB1, 0xB0,
+ 0xB9, 0xBA, 0x65, 0xB2,
+ 0x5C, 0x1F, 0x0B
+ ];
+ cff.set(shit, currentOffset);
+ currentOffset += shit.length;
+
+ var fontData = [];
+ for (var i = 0; i < currentOffset; i++)
+ fontData.push(cff[i]);
+
+ return fontData;
+ }
+};
+
--- /dev/null
+/**
+ * The Type2 reader code below is only used for debugging purpose since Type2
+ * is only a CharString format and is never used directly as a Font file.
+ *
+ * So the code here is useful for dumping the data content of a .cff file in
+ * order to investigate the similarity between a Type1 CharString and a Type2
+ * CharString or to understand the structure of the CFF format.
+ */
+
+
+/**
+ * Build a charset by assigning the glyph name and the human readable form
+ * of the glyph data.
+ */
+function readCharset(aStream, aCharstrings) {
+ var charset = {};
+
+ var format = aStream.getByte();
+ if (format == 0) {
+ charset[".notdef"] = readCharstringEncoding(aCharstrings[0]);
+
+ var count = aCharstrings.length - 1;
+ for (var i = 1; i < count + 1; i++) {
+ var sid = aStream.getByte() << 8 | aStream.getByte();
+ charset[CFFStrings[sid]] = readCharstringEncoding(aCharstrings[i]);
+ //log(CFFStrings[sid] + "::" + charset[CFFStrings[sid]]);
+ }
+ } else if (format == 1) {
+ error("Charset Range are not supported");
+ } else {
+ error("Invalid charset format");
+ }
+
+ return charset;
+};
+
+/**
+ * Take a Type2 binary charstring as input and transform it to a human
+ * readable representation as specified by the 'The Type 2 Charstring Format',
+ * chapter 3.1.
+ */
+function readCharstringEncoding(aString) {
+ var charstringTokens = [];
+
+ var count = aString.length;
+ for (var i = 0; i < count; ) {
+ var value = aString[i++];
+ var token = null;
+
+ if (value < 0) {
+ continue;
+ } else if (value <= 11) {
+ token = CFFEncodingMap[value];
+ } else if (value == 12) {
+ token = CFFEncodingMap[value][aString[i++]];
+ } else if (value <= 18) {
+ token = CFFEncodingMap[value];
+ } else if (value <= 20) {
+ var mask = aString[i++];
+ token = CFFEncodingMap[value];
+ } else if (value <= 27) {
+ token = CFFEncodingMap[value];
+ } else if (value == 28) {
+ token = aString[i++] << 8 | aString[i++];
+ } else if (value <= 31) {
+ token = CFFEncodingMap[value];
+ } else if (value < 247) {
+ token = parseInt(value) - 139;
+ } else if (value < 251) {
+ token = ((value - 247) * 256) + aString[i++] + 108;
+ } else if (value < 255) {
+ token = -((value - 251) * 256) - aString[i++] - 108;
+ } else {// value == 255
+ token = aString[i++] << 24 | aString[i++] << 16 |
+ aString[i++] << 8 | aString[i];
+ }
+
+ charstringTokens.push(token);
+ }
+
+ return charstringTokens;
+};
+
+
+/**
+ * Take a binary DICT Data as input and transform it into a human readable
+ * form as specified by 'The Compact Font Format Specification', chapter 5.
+ */
+function readFontDictData(aString, aMap) {
+ var fontDictDataTokens = [];
+
+ var count = aString.length;
+ for (var i = 0; i < count; i) {
+ var value = aString[i++];
+ var token = null;
+
+ if (value == 12) {
+ token = aMap[value][aString[i++]];
+ } else if (value == 28) {
+ token = aString[i++] << 8 | aString[i++];
+ } else if (value == 29) {
+ token = aString[i++] << 24 |
+ aString[i++] << 16 |
+ aString[i++] << 8 |
+ aString[i++];
+ } else if (value == 30) {
+ token = "";
+ var parsed = false;
+ while (!parsed) {
+ var byte = aString[i++];
+
+ var nibbles = [parseInt(byte / 16), parseInt(byte % 16)];
+ for (var j = 0; j < nibbles.length; j++) {
+ var nibble = nibbles[j];
+ switch (nibble) {
+ case 0xA:
+ token += ".";
+ break;
+ case 0xB:
+ token += "E";
+ break;
+ case 0xC:
+ token += "E-";
+ break;
+ case 0xD:
+ break;
+ case 0xE:
+ token += "-";
+ break;
+ case 0xF:
+ parsed = true;
+ break;
+ default:
+ token += nibble;
+ break;
+ }
+ }
+ };
+ token = parseFloat(token);
+ } else if (value <= 31) {
+ token = aMap[value];
+ } else if (value <= 246) {
+ token = parseInt(value) - 139;
+ } else if (value <= 250) {
+ token = ((value - 247) * 256) + aString[i++] + 108;
+ } else if (value <= 254) {
+ token = -((value - 251) * 256) - aString[i++] - 108;
+ } else if (value == 255) {
+ error("255 is not a valid DICT command");
+ }
+
+ fontDictDataTokens.push(token);
+ }
+
+ return fontDictDataTokens;
+};
+
+
+/**
+ * Take a stream as input and return an array of objects.
+ * In CFF an INDEX is a structure with the following format:
+ * {
+ * count: 2 bytes (Number of objects stored in INDEX),
+ * offsize: 1 byte (Offset array element size),
+ * offset: [count + 1] bytes (Offsets array),
+ * data: - (Objects data)
+ * }
+ *
+ * More explanation are given in the 'CFF Font Format Specification',
+ * chapter 5.
+ */
+function readFontIndexData(aStream, aIsByte) {
+ var count = aStream.getByte() << 8 | aStream.getByte();
+ var offsize = aStream.getByte();
+
+ function getNextOffset() {
+ switch (offsize) {
+ case 0:
+ return 0;
+ case 1:
+ return aStream.getByte();
+ case 2:
+ return aStream.getByte() << 8 | aStream.getByte();
+ case 3:
+ return aStream.getByte() << 16 | aStream.getByte() << 8 |
+ aStream.getByte();
+ case 4:
+ return aStream.getByte() << 24 | aStream.getByte() << 16 |
+ aStream.getByte() << 8 | aStream.getByte();
+ }
+ };
+
+ var offsets = [];
+ for (var i = 0; i < count + 1; i++)
+ offsets.push(getNextOffset());
+
+ log("Found " + count + " objects at offsets :" + offsets + " (offsize: " + offsize + ")");
+
+ // Now extract the objects
+ var relativeOffset = aStream.pos;
+ var objects = [];
+ for (var i = 0; i < count; i++) {
+ var offset = offsets[i];
+ aStream.pos = relativeOffset + offset - 1;
+
+ var data = [];
+ var length = offsets[i + 1] - 1;
+ for (var j = offset - 1; j < length; j++)
+ data.push(aIsByte ? aStream.getByte() : aStream.getChar());
+ objects.push(data);
+ }
+
+ return objects;
+};
+
+var Type2Parser = function(aFilePath) {
+ var font = new Dict();
+
+ var xhr = new XMLHttpRequest();
+ xhr.open("GET", aFilePath, false);
+ xhr.mozResponseType = xhr.responseType = "arraybuffer";
+ xhr.expected = (document.URL.indexOf("file:") == 0) ? 0 : 200;
+ xhr.send(null);
+ this.data = new Stream(xhr.mozResponseArrayBuffer || xhr.mozResponse ||
+ xhr.responseArrayBuffer || xhr.response);
+
+ // Turn on this flag for additional debugging logs
+ var debug = false;
+
+ function dump(aStr) {
+ if (debug)
+ log(aStr);
+ };
+
+ function parseAsToken(aString, aMap) {
+ var decoded = readFontDictData(aString, aMap);
+
+ var stack = [];
+ var count = decoded.length;
+ for (var i = 0; i < count; i++) {
+ var token = decoded[i];
+ if (IsNum(token)) {
+ stack.push(token);
+ } else {
+ switch (token.operand) {
+ case "SID":
+ font.set(token.name, CFFStrings[stack.pop()]);
+ break;
+ case "number number":
+ font.set(token.name, {
+ offset: stack.pop(),
+ size: stack.pop()
+ });
+ break;
+ case "boolean":
+ font.set(token.name, stack.pop());
+ break;
+ case "delta":
+ font.set(token.name, stack.pop());
+ break;
+ default:
+ if (token.operand && token.operand.length) {
+ var array = [];
+ for (var j = 0; j < token.operand.length; j++)
+ array.push(stack.pop());
+ font.set(token.name, array);
+ } else {
+ font.set(token.name, stack.pop());
+ }
+ break;
+ }
+ }
+ }
+ };
+
+ this.parse = function(aStream) {
+ font.set("major", aStream.getByte());
+ font.set("minor", aStream.getByte());
+ font.set("hdrSize", aStream.getByte());
+ font.set("offsize", aStream.getByte());
+
+ // Move the cursor after the header
+ aStream.skip(font.get("hdrSize") - aStream.pos);
+
+ // Read the NAME Index
+ dump("Reading Index: Names");
+ font.set("Names", readFontIndexData(aStream));
+ log("Names: " + font.get("Names"));
+
+ // Read the Top Dict Index
+ dump("Reading Index: TopDict");
+ var topDict = readFontIndexData(aStream, true);
+ log("TopDict: " + topDict);
+
+ // Read the String Index
+ dump("Reading Index: Strings");
+ var strings = readFontIndexData(aStream);
+ log("strings: " + strings);
+
+ // Fill up the Strings dictionary with the new unique strings
+ for (var i = 0; i < strings.length; i++)
+ CFFStrings.push(strings[i].join(""));
+
+ // Parse the TopDict operator
+ var objects = [];
+ var count = topDict.length;
+ for (var i = 0; i < count; i++)
+ parseAsToken(topDict[i], CFFDictDataMap);
+
+ // Read the Global Subr Index that comes just after the Strings Index
+ // (cf. "The Compact Font Format Specification" Chapter 16)
+ dump("Reading Global Subr Index");
+ var subrs = readFontIndexData(aStream, true);
+ dump(subrs);
+
+ // Reading Private Dict
+ var private = font.get("Private");
+ log("Reading Private Dict (offset: " + private.offset + " size: " + private.size + ")");
+ aStream.pos = private.offset;
+
+ var privateDict = [];
+ for (var i = 0; i < private.size; i++)
+ privateDict.push(aStream.getByte());
+ dump("private:" + privateDict);
+ parseAsToken(privateDict, CFFDictPrivateDataMap);
+
+ for (var p in font.map)
+ dump(p + "::" + font.get(p));
+
+ // Read CharStrings Index
+ var charStringsOffset = font.get("CharStrings");
+ dump("Read CharStrings Index (offset: " + charStringsOffset + ")");
+ aStream.pos = charStringsOffset;
+ var charStrings = readFontIndexData(aStream, true);
+
+ // Read Charset
+ dump("Read Charset for " + charStrings.length + " glyphs");
+ var charsetEntry = font.get("charset");
+ if (charsetEntry == 0) {
+ error("Need to support CFFISOAdobeCharset");
+ } else if (charsetEntry == 1) {
+ error("Need to support CFFExpert");
+ } else if (charsetEntry == 2) {
+ error("Need to support CFFExpertSubsetCharset");
+ } else {
+ aStream.pos = charsetEntry;
+ var charset = readCharset(aStream, charStrings);
+ }
+ }
+};
+
+/*
+ * To try the Type2 decoder on a local file in the current directory:
+ *
+ * var cff = new Type2Parser("file.cff");
+ * cff.parse(this.data);
+ *
+ * To try the Type2 decoder on a custom built CFF array:
+ *
+ * var file = new Uint8Array(cffFileArray, 0, cffFileSize);
+ * var parser = new Type2Parser();
+ * parser.parse(new Stream(file));
+ *
+ */
+
+
+/**
+ * Write to a file to the disk (works only on Firefox in privilege mode)
+ * but this is useful for dumping a font file to the disk and check with
+ * fontforge or the ots program what's wrong with the file.
+ *
+ * writeToFile(fontData, "/tmp/pdf.js." + fontCount + ".cff");
+ */
+function writeToFile(aBytes, aFilePath) {
+ netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+ var Cc = Components.classes,
+ Ci = Components.interfaces;
+ var file = Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsILocalFile);
+ file.initWithPath(aFilePath);
+
+ var stream = Cc["@mozilla.org/network/file-output-stream;1"]
+ .createInstance(Ci.nsIFileOutputStream);
+ stream.init(file, 0x04 | 0x08 | 0x20, 0600, 0);
+
+ var bos = Cc["@mozilla.org/binaryoutputstream;1"]
+ .createInstance(Ci.nsIBinaryOutputStream);
+ bos.setOutputStream(stream);
+ bos.writeByteArray(aBytes, aBytes.length);
+ stream.close();
+};
+
<html>
-<<<<<<< HEAD
<head>
<title>Simple pdf.js page viewer</title>
<link rel="stylesheet" href="test.css"></link>
- <script type="text/javascript" src="pdf.js"></script>
<script type="text/javascript" src="test.js"></script>
+ <script type="text/javascript" src="pdf.js"></script>
+ <script type="text/javascript" src="fonts.js"></script>
<script type="text/javascript" src="cffStandardStrings.js"></script>
- <script type="text/javascript" src="glyphlist.js"></script>
<script type="text/javascript" src="Encodings.js"></script>
- <script type="text/javascript" src="PDFFont.js"></script>
+ <script type="text/javascript" src="glyphlist.js"></script>
</head>
<body onload="load();">
projects / pdf.js.git / commitdiff