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Merge pull request #7098 from Snuffleupagus/uint32-checksums

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Ensure that TrueType font tables have `uint32` checksums
This commit is contained in:
Yury Delendik 2016-03-22 14:11:27 -05:00
commit 4a44a2c7dc
1 changed files with 3 additions and 4 deletions
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src/core/fonts.js
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@ -403,9 +403,8 @@ var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
// checksum // checksum
var checksum = 0; var checksum = 0;
for (j = tableOffsets[i], jj = tableOffsets[i + 1]; j < jj; j += 4) { for (j = tableOffsets[i], jj = tableOffsets[i + 1]; j < jj; j += 4) {
var quad = (file[j] << 24) + (file[j + 1] << 16) + var quad = readUint32(file, j);
(file[j + 2] << 8) + file[j + 3]; checksum = (checksum + quad) >>> 0;
checksum = (checksum + quad) | 0;
} }
writeInt32(file, offset + 4, checksum); writeInt32(file, offset + 4, checksum);
@ -1246,7 +1245,7 @@ var Font = (function FontClosure() {
function readTableEntry(file) { function readTableEntry(file) {
var tag = bytesToString(file.getBytes(4)); var tag = bytesToString(file.getBytes(4));
var checksum = file.getInt32(); var checksum = file.getInt32() >>> 0;
var offset = file.getInt32() >>> 0; var offset = file.getInt32() >>> 0;
var length = file.getInt32() >>> 0; var length = file.getInt32() >>> 0;