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Specification updates: known table tags, reserved flag bits, always preprocess

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This commit is contained in:
David Kuettel
2014-04-29 17:47:03 -07:00
parent 05b3775ecb
commit 47c5016d7f
2 changed files with 47 additions and 20 deletions
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woff2/woff2.cc
+46 -17
View File
@@ -772,7 +772,7 @@ bool ReadLongDirectory(ots::Buffer* file, std::vector<Table>* tables,
return true;
}
const uint32_t known_tags[29] = {
const uint32_t known_tags[63] = {
TAG('c', 'm', 'a', 'p'), // 0
TAG('h', 'e', 'a', 'd'), // 1
TAG('h', 'h', 'e', 'a'), // 2
@@ -802,13 +802,47 @@ const uint32_t known_tags[29] = {
TAG('G', 'D', 'E', 'F'), // 26
TAG('G', 'P', 'O', 'S'), // 27
TAG('G', 'S', 'U', 'B'), // 28
TAG('E', 'B', 'S', 'C'), // 29
TAG('J', 'S', 'T', 'F'), // 30
TAG('M', 'A', 'T', 'H'), // 31
TAG('C', 'B', 'D', 'T'), // 32
TAG('C', 'B', 'L', 'C'), // 33
TAG('C', 'O', 'L', 'R'), // 34
TAG('C', 'P', 'A', 'L'), // 35
TAG('S', 'V', 'G', ' '), // 36
TAG('s', 'b', 'i', 'x'), // 37
TAG('a', 'c', 'n', 't'), // 38
TAG('a', 'v', 'a', 'r'), // 39
TAG('b', 'd', 'a', 't'), // 40
TAG('b', 'l', 'o', 'c'), // 41
TAG('b', 's', 'l', 'n'), // 42
TAG('c', 'v', 'a', 'r'), // 43
TAG('f', 'd', 's', 'c'), // 44
TAG('f', 'e', 'a', 't'), // 45
TAG('f', 'm', 't', 'x'), // 46
TAG('f', 'v', 'a', 'r'), // 47
TAG('g', 'v', 'a', 'r'), // 48
TAG('h', 's', 't', 'y'), // 49
TAG('j', 'u', 's', 't'), // 50
TAG('l', 'c', 'a', 'r'), // 51
TAG('m', 'o', 'r', 't'), // 52
TAG('m', 'o', 'r', 'x'), // 53
TAG('o', 'p', 'b', 'd'), // 54
TAG('p', 'r', 'o', 'p'), // 55
TAG('t', 'r', 'a', 'k'), // 56
TAG('Z', 'a', 'p', 'f'), // 57
TAG('S', 'i', 'l', 'f'), // 58
TAG('G', 'l', 'a', 't'), // 59
TAG('G', 'l', 'o', 'c'), // 60
TAG('F', 'e', 'a', 't'), // 61
TAG('S', 'i', 'l', 'l'), // 62
};
int KnownTableIndex(uint32_t tag) {
for (int i = 0; i < 29; ++i) {
for (int i = 0; i < 63; ++i) {
if (tag == known_tags[i]) return i;
}
return 31;
return 63;
}
bool ReadShortDirectory(ots::Buffer* file, std::vector<Table>* tables,
@@ -820,25 +854,24 @@ bool ReadShortDirectory(ots::Buffer* file, std::vector<Table>* tables,
return OTS_FAILURE();
}
uint32_t tag;
if ((flag_byte & 0x1f) == 0x1f) {
if ((flag_byte & 0x3f) == 0x3f) {
if (!file->ReadU32(&tag)) {
return OTS_FAILURE();
}
} else {
if ((flag_byte & 0x1f) >= (sizeof(known_tags) / sizeof(known_tags[0]))) {
return OTS_FAILURE();
tag = known_tags[flag_byte & 0x3f];
}
tag = known_tags[flag_byte & 0x1f];
}
// Bits 5 and 6 are reserved and must be 0.
if ((flag_byte & 0x60) != 0) {
// Bits 6 and 7 are reserved and must be 0.
if ((flag_byte & 0xC0) != 0) {
return OTS_FAILURE();
}
uint32_t flags = kCompressionTypeBrotli;
if (i > 0) {
flags |= kWoff2FlagsContinueStream;
}
if ((flag_byte & 0x80) != 0) {
// Always transform the glyf and loca tables
if (tag == TAG('g', 'l', 'y', 'f') ||
tag == TAG('l', 'o', 'c', 'a')) {
flags |= kWoff2FlagsTransform;
}
uint32_t dst_length;
@@ -1043,15 +1076,12 @@ bool ConvertWOFF2ToTTF(uint8_t* result, size_t result_length,
void StoreTableEntry(const Table& table, size_t* offset, uint8_t* dst) {
uint8_t flag_byte = KnownTableIndex(table.tag);
if ((table.flags & kWoff2FlagsTransform) != 0) {
flag_byte |= 0x80;
}
dst[(*offset)++] = flag_byte;
if ((flag_byte & 0x1f) == 0x1f) {
if ((flag_byte & 0x3f) == 0x3f) {
StoreU32(table.tag, offset, dst);
}
StoreBase128(table.src_length, offset, dst);
if ((flag_byte & 0x80) != 0) {
if ((table.flags & kWoff2FlagsTransform) != 0) {
StoreBase128(table.transform_length, offset, dst);
}
}
@@ -1123,7 +1153,6 @@ size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length) {
bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
uint8_t *result, size_t *result_length) {
Woff2ConvertOptions options;
Font font;
woff2/woff2.h
-2
View File
@@ -43,8 +43,6 @@ size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length);
bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
uint8_t *result, size_t *result_length);
} // namespace woff2
#endif // WOFF2_WOFF2_H_