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Detect EBML magic number to skip encoding detection for MKV 

MKV loads slow after f733297499
This commit is contained in:
wangqr 2019-06-16 19:14:10 -04:00
parent 2bbed6c5a0
commit d6ddea0f65
1 changed files with 8 additions and 0 deletions
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8
libaegisub/common/charset.cpp
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@ -29,6 +29,14 @@ namespace agi { namespace charset {
std::string Detect(agi::fs::path const& file) {
agi::read_file_mapping fp(file);
// FIXME: Dirty hack for Matroska. These 4 bytes are the magic
// number of EBML which is used by mkv and webm
if (fp.size() >= 4) {
const char* buf = fp.read(0, 4);
if (!strncmp(buf, "\x1a\x45\xdf\xa3", 4))
return "binary";
}
#ifdef WITH_UCHARDET
agi::scoped_holder<uchardet_t> ud(uchardet_new(), uchardet_delete);
for (uint64_t offset = 0; offset < fp.size(); ) {