411 lines
12 KiB
JavaScript
411 lines
12 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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'use strict';
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/*
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* The Type2 reader code below is only used for debugging purpose since Type2
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* is only a CharString format and is never used directly as a Font file.
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*
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* So the code here is useful for dumping the data content of a .cff file in
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* order to investigate the similarity between a Type1 CharString and a Type2
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* CharString or to understand the structure of the CFF format.
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*/
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/*
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* Build a charset by assigning the glyph name and the human readable form
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* of the glyph data.
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*/
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function readCharset(aStream, aCharstrings) {
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var charset = {};
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var format = aStream.getByte();
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var count = aCharstrings.length - 1;
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if (format == 0) {
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charset['.notdef'] = readCharstringEncoding(aCharstrings[0]);
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for (var i = 1; i < count + 1; i++) {
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var sid = aStream.getByte() << 8 | aStream.getByte();
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charset[CFFStrings[sid]] = readCharstringEncoding(aCharstrings[i]);
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//log(CFFStrings[sid] + "::" + charset[CFFStrings[sid]]);
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}
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} else if (format == 1) {
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for (var i = 1; i < count + 1; i++) {
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var first = aStream.getByte();
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first = (first << 8) | aStream.getByte();
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var numLeft = aStream.getByte();
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for (var j = 0; j <= numLeft; j++) {
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var sid = first++;
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if (CFFStrings[sid] == 'three')
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log(aCharstrings[j]);
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charset[CFFStrings[sid]] = readCharstringEncoding(aCharstrings[j]);
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}
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}
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} else {
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error('Invalid charset format');
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}
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return charset;
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}
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/*
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* Take a Type2 binary charstring as input and transform it to a human
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* readable representation as specified by the 'The Type 2 Charstring Format',
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* chapter 3.1.
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*/
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function readCharstringEncoding(aString) {
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if (!aString)
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return '';
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var charstringTokens = [];
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var count = aString.length;
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for (var i = 0; i < count; ) {
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var value = aString[i++];
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var token = null;
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if (value < 0) {
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continue;
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} else if (value <= 11) {
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token = CFFEncodingMap[value];
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} else if (value == 12) {
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token = CFFEncodingMap[value][aString[i++]];
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} else if (value <= 18) {
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token = CFFEncodingMap[value];
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} else if (value <= 20) {
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var mask = aString[i++];
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token = CFFEncodingMap[value];
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} else if (value <= 27) {
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token = CFFEncodingMap[value];
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} else if (value == 28) {
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token = aString[i++] << 8 | aString[i++];
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} else if (value <= 31) {
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token = CFFEncodingMap[value];
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} else if (value < 247) {
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token = parseInt(value, 10) - 139;
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} else if (value < 251) {
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token = (value - 247) * 256 + aString[i++] + 108;
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} else if (value < 255) {
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token = -(value - 251) * 256 - aString[i++] - 108;
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} else {// value == 255
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token = aString[i++] << 24 | aString[i++] << 16 |
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aString[i++] << 8 | aString[i];
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}
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charstringTokens.push(token);
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}
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return charstringTokens;
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}
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/*
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* Take a binary DICT Data as input and transform it into a human readable
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* form as specified by 'The Compact Font Format Specification', chapter 5.
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*/
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function readFontDictData(aString, aMap) {
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var fontDictDataTokens = [];
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var count = aString.length;
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for (var i = 0; i < count; i) {
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var value = aString[i++];
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var token = null;
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if (value == 12) {
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token = aMap[value][aString[i++]];
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} else if (value == 28) {
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token = aString[i++] << 8 | aString[i++];
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} else if (value == 29) {
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token = aString[i++] << 24 |
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aString[i++] << 16 |
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aString[i++] << 8 |
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aString[i++];
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} else if (value == 30) {
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token = '';
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var parsed = false;
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while (!parsed) {
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var byte = aString[i++];
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var nibbles = [parseInt(byte / 16, 10), parseInt(byte % 16, 10)];
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for (var j = 0; j < nibbles.length; j++) {
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var nibble = nibbles[j];
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switch (nibble) {
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case 0xA:
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token += '.';
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break;
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case 0xB:
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token += 'E';
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break;
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case 0xC:
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token += 'E-';
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break;
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case 0xD:
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break;
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case 0xE:
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token += '-';
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break;
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case 0xF:
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parsed = true;
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break;
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default:
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token += nibble;
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break;
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}
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}
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}
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token = parseFloat(token);
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} else if (value <= 31) {
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token = aMap[value];
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} else if (value <= 246) {
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token = parseInt(value, 10) - 139;
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} else if (value <= 250) {
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token = (value - 247) * 256 + aString[i++] + 108;
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} else if (value <= 254) {
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token = -(value - 251) * 256 - aString[i++] - 108;
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} else if (value == 255) {
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error('255 is not a valid DICT command');
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}
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fontDictDataTokens.push(token);
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}
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return fontDictDataTokens;
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}
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/*
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* Take a stream as input and return an array of objects.
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* In CFF an INDEX is a structure with the following format:
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* {
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* count: 2 bytes (Number of objects stored in INDEX),
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* offsize: 1 byte (Offset array element size),
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* offset: [count + 1] bytes (Offsets array),
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* data: - (Objects data)
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* }
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*
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* More explanation are given in the 'CFF Font Format Specification',
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* chapter 5.
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*/
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function readFontIndexData(aStream, aIsByte) {
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var count = aStream.getByte() << 8 | aStream.getByte();
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var offsize = aStream.getByte();
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function getNextOffset() {
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switch (offsize) {
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case 0:
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return 0;
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case 1:
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return aStream.getByte();
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case 2:
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return aStream.getByte() << 8 | aStream.getByte();
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case 3:
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return aStream.getByte() << 16 | aStream.getByte() << 8 |
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aStream.getByte();
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case 4:
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return aStream.getByte() << 24 | aStream.getByte() << 16 |
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aStream.getByte() << 8 | aStream.getByte();
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}
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error(offsize + ' is not a valid offset size');
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return null;
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}
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var offsets = [];
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for (var i = 0; i < count + 1; i++)
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offsets.push(getNextOffset());
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dump('Found ' + count + ' objects at offsets :' +
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offsets + ' (offsize: ' + offsize + ')');
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// Now extract the objects
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var relativeOffset = aStream.pos;
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var objects = [];
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for (var i = 0; i < count; i++) {
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var offset = offsets[i];
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aStream.pos = relativeOffset + offset - 1;
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var data = [];
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var length = offsets[i + 1] - 1;
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for (var j = offset - 1; j < length; j++)
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data.push(aIsByte ? aStream.getByte() : aStream.getChar());
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objects.push(data);
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}
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return objects;
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}
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var Type2Parser = function(aFilePath) {
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var font = new Dict();
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var xhr = new XMLHttpRequest();
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xhr.open('GET', aFilePath, false);
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xhr.mozResponseType = xhr.responseType = 'arraybuffer';
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xhr.expected = (document.URL.indexOf('file:') == 0) ? 0 : 200;
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xhr.send(null);
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this.data = new Stream(xhr.mozResponseArrayBuffer || xhr.mozResponse ||
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xhr.responseArrayBuffer || xhr.response);
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// Turn on this flag for additional debugging logs
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var debug = false;
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function dump(aStr) {
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if (debug)
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log(aStr);
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}
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function parseAsToken(aString, aMap) {
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var decoded = readFontDictData(aString, aMap);
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var stack = [];
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var count = decoded.length;
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for (var i = 0; i < count; i++) {
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var token = decoded[i];
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if (IsNum(token)) {
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stack.push(token);
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} else {
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switch (token.operand) {
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case 'SID':
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font.set(token.name, CFFStrings[stack.pop()]);
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break;
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case 'number number':
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font.set(token.name, {
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offset: stack.pop(),
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size: stack.pop()
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});
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break;
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case 'boolean':
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font.set(token.name, stack.pop());
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break;
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case 'delta':
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font.set(token.name, stack.pop());
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break;
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default:
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if (token.operand && token.operand.length) {
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var array = [];
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for (var j = 0; j < token.operand.length; j++)
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array.push(stack.pop());
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font.set(token.name, array);
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} else {
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font.set(token.name, stack.pop());
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}
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break;
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}
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}
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}
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}
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this.parse = function(aStream) {
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font.set('major', aStream.getByte());
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font.set('minor', aStream.getByte());
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font.set('hdrSize', aStream.getByte());
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font.set('offsize', aStream.getByte());
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// Read the NAME Index
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dump('Reading Index: Names');
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font.set('Names', readFontIndexData(aStream));
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dump('Names: ' + font.get('Names'));
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// Read the Top Dict Index
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dump('Reading Index: TopDict');
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var topDict = readFontIndexData(aStream, true);
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dump('TopDict: ' + topDict);
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// Read the String Index
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dump('Reading Index: Strings');
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var strings = readFontIndexData(aStream);
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dump('strings: ' + strings);
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// Fill up the Strings dictionary with the new unique strings
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for (var i = 0; i < strings.length; i++)
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CFFStrings.push(strings[i].join(''));
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// Parse the TopDict operator
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var objects = [];
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var count = topDict.length;
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for (var i = 0; i < count; i++)
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parseAsToken(topDict[i], CFFDictDataMap);
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// Read the Global Subr Index that comes just after the Strings Index
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// (cf. "The Compact Font Format Specification" Chapter 16)
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dump('Reading Global Subr Index');
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var subrs = readFontIndexData(aStream, true);
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dump(subrs);
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// Reading Private Dict
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var priv = font.get('Private');
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dump('Reading Private Dict (offset: ' + priv.offset +
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' size: ' + priv.size + ')');
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aStream.pos = priv.offset;
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var privateDict = [];
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for (var i = 0; i < priv.size; i++)
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privateDict.push(aStream.getByte());
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dump('private:' + privateDict);
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parseAsToken(privateDict, CFFDictPrivateDataMap);
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for (var p in font.map)
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dump(p + '::' + font.get(p));
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// Read CharStrings Index
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var charStringsOffset = font.get('CharStrings');
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dump('Read CharStrings Index (offset: ' + charStringsOffset + ')');
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aStream.pos = charStringsOffset;
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var charStrings = readFontIndexData(aStream, true);
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// Read Charset
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dump('Read Charset for ' + charStrings.length + ' glyphs');
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var charsetEntry = font.get('charset');
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if (charsetEntry == 0) {
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error('Need to support CFFISOAdobeCharset');
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} else if (charsetEntry == 1) {
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error('Need to support CFFExpert');
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} else if (charsetEntry == 2) {
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error('Need to support CFFExpertSubsetCharset');
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} else {
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aStream.pos = charsetEntry;
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var charset = readCharset(aStream, charStrings);
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}
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};
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};
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/*
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* To try the Type2 decoder on a local file in the current directory:
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*
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* var cff = new Type2Parser("file.cff");
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* cff.parse(this.data);
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*
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* To try the Type2 decoder on a custom built CFF array:
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*
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* var file = new Uint8Array(cffFileArray, 0, cffFileSize);
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* var parser = new Type2Parser();
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* parser.parse(new Stream(file));
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*
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*/
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/*
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* Write to a file to the disk (works only on Firefox in privilege mode)
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* but this is useful for dumping a font file to the disk and check with
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* fontforge or the ots program what's wrong with the file.
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*
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* writeToFile(fontData, "/tmp/pdf.js." + fontCount + ".cff");
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*/
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function writeToFile(aBytes, aFilePath) {
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if (!('netscape' in window))
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return;
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netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
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var Cc = Components.classes,
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Ci = Components.interfaces;
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var file = Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsILocalFile);
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file.initWithPath(aFilePath);
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var stream = Cc['@mozilla.org/network/file-output-stream;1']
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.createInstance(Ci.nsIFileOutputStream);
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stream.init(file, 0x04 | 0x08 | 0x20, 0x180, 0);
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var bos = Cc['@mozilla.org/binaryoutputstream;1']
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.createInstance(Ci.nsIBinaryOutputStream);
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bos.setOutputStream(stream);
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bos.writeByteArray(aBytes, aBytes.length);
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stream.close();
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}
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