Sakurai/pdf.js
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write OTF header using a string, not an array

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This commit is contained in:
Andreas Gal 2011-06-19 16:13:59 -07:00
parent e46a88b1dc
commit f337d6105c
1 changed files with 21 additions and 11 deletions
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32
fonts.js
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@ -326,29 +326,39 @@ var Font = (function () {
convert: function font_convert(aFont, aProperties) {
var otf = new Uint8Array(kMaxFontFileSize);
function createOpenTypeHeader(aFile, aOffsets, aNumTables) {
function s2a(s) {
var a = [];
for (var i = 0; i < s.length; ++i)
a[i] = s.charCodeAt(i);
return a;
}
function createOpenTypeHeader(aFile, aOffsets, numTables) {
var header = "";
function WriteHeader16(value) {
header += String.fromCharCode(value >> 8);
header += String.fromCharCode(value & 0xff);
}
// sfnt version (4 bytes)
var version = [0x4F, 0x54, 0x54, 0X4F];
header += "\x4F\x54\x54\x4F";
// numTables (2 bytes)
var numTables = aNumTables;
WriteHeader16(numTables);
// searchRange (2 bytes)
var tablesMaxPower2 = FontsUtils.getMaxPower2(numTables);
var searchRange = tablesMaxPower2 * 16;
WriteHeader16(searchRange);
// entrySelector (2 bytes)
var entrySelector = Math.log(tablesMaxPower2) / Math.log(2);
WriteHeader16(Math.log(tablesMaxPower2) / Math.log(2));
// rangeShift (2 bytes)
var rangeShift = numTables * 16 - searchRange;
WriteHeader16(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);
aFile.set(s2a(header), aOffsets.currentOffset);
aOffsets.currentOffset += header.length;
aOffsets.virtualOffset += header.length;
}