WebRoot/js/fonts_utils.js

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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */

"use strict";

/**
 * 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) {