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Add proper lzma format detection

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topjohnwu
2025-12-05 02:30:18 -08:00
committed by John Wu
parent 505053f9b4
commit 9ac4b5ce7d
1 changed files with 14 additions and 2 deletions
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16
native/src/boot/bootimg.cpp
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@@ -53,6 +53,19 @@ static bool check_env(const char *name) {
return val != nullptr && val == "true"sv;
}
static bool guess_lzma(const uint8_t *buf, size_t len) {
// 0 : (pb * 5 + lp) * 9 + lc
// 1 - 4 : dict size, must be 2^n
// 5 - 12: all 0xFF
if (len <= 13) return false;
if (memcmp(buf, "\x5d", 1) != 0) return false;
uint32_t dict_sz = 0;
memcpy(&dict_sz, buf + 1, sizeof(dict_sz));
if (dict_sz == 0 || (dict_sz & (dict_sz - 1)) != 0) return false;
if (memcmp(buf + 5, "\xff\xff\xff\xff\xff\xff\xff\xff", 8) != 0) return false;
return true;
}
FileFormat check_fmt(const void *buf, size_t len) {
if (CHECKED_MATCH(CHROMEOS_MAGIC)) {
return FileFormat::CHROMEOS;
@@ -66,8 +79,7 @@ FileFormat check_fmt(const void *buf, size_t len) {
return FileFormat::LZOP;
} else if (CHECKED_MATCH(XZ_MAGIC)) {
return FileFormat::XZ;
} else if (len >= 13 && memcmp(buf, "\x5d\x00\x00", 3) == 0
&& (((char *)buf)[12] == '\xff' || ((char *)buf)[12] == '\x00')) {
} else if (guess_lzma(static_cast<const uint8_t *>(buf), len)) {
return FileFormat::LZMA;
} else if (CHECKED_MATCH(BZIP_MAGIC)) {
return FileFormat::BZIP2;