Magisk/native/jni/magiskboot/format.cpp

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#include <string.h>
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#include "format.hpp"
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std::map<std::string_view, format_t> name2fmt;
Fmt2Name fmt2name;
Fmt2Ext fmt2ext;
class FormatInit {
public:
FormatInit() {
name2fmt["gzip"] = GZIP;
name2fmt["xz"] = XZ;
name2fmt["lzma"] = LZMA;
name2fmt["bzip2"] = BZIP2;
name2fmt["lz4"] = LZ4;
name2fmt["lz4_legacy"] = LZ4_LEGACY;
name2fmt["lz4_lg"] = LZ4_LG;
}
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};
static FormatInit init;
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#define MATCH(s) (len >= (sizeof(s) - 1) && memcmp(buf, s, sizeof(s) - 1) == 0)
format_t check_fmt(const void *buf, size_t len) {
if (MATCH(CHROMEOS_MAGIC)) {
return CHROMEOS;
} else if (MATCH(BOOT_MAGIC)) {
return AOSP;
} else if (MATCH(VENDOR_BOOT_MAGIC)) {
return AOSP_VENDOR;
} else if (MATCH(GZIP1_MAGIC) || MATCH(GZIP2_MAGIC)) {
return GZIP;
} else if (MATCH(LZOP_MAGIC)) {
return LZOP;
} else if (MATCH(XZ_MAGIC)) {
return XZ;
} else if (len >= 13 && memcmp(buf, "\x5d\x00\x00", 3) == 0
&& (((char *)buf)[12] == '\xff' || ((char *)buf)[12] == '\x00')) {
return LZMA;
} else if (MATCH(BZIP_MAGIC)) {
return BZIP2;
} else if (MATCH(LZ41_MAGIC) || MATCH(LZ42_MAGIC)) {
return LZ4;
} else if (MATCH(LZ4_LEG_MAGIC)) {
return LZ4_LEGACY;
} else if (MATCH(MTK_MAGIC)) {
return MTK;
} else if (MATCH(DTB_MAGIC)) {
return DTB;
} else if (MATCH(DHTB_MAGIC)) {
return DHTB;
} else if (MATCH(TEGRABLOB_MAGIC)) {
return BLOB;
} else {
return UNKNOWN;
}
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}
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const char *Fmt2Name::operator[](format_t fmt) {
switch (fmt) {
case GZIP:
return "gzip";
case LZOP:
return "lzop";
case XZ:
return "xz";
case LZMA:
return "lzma";
case BZIP2:
return "bzip2";
case LZ4:
return "lz4";
case LZ4_LEGACY:
return "lz4_legacy";
case LZ4_LG:
return "lz4_lg";
case DTB:
return "dtb";
default:
return "raw";
}
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}
const char *Fmt2Ext::operator[](format_t fmt) {
switch (fmt) {
case GZIP:
return ".gz";
case LZOP:
return ".lzo";
case XZ:
return ".xz";
case LZMA:
return ".lzma";
case BZIP2:
return ".bz2";
case LZ4:
case LZ4_LEGACY:
case LZ4_LG:
return ".lz4";
default:
return "";
}
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}