1 //===- llvm/BinaryFormat/Magic.cpp - File magic identification --*- C++ -*-===//
9 #include "llvm/BinaryFormat/Magic.h"
28 static bool startswith(StringRef Magic, const char (&S)[N]) {  in startswith()  argument
29   return Magic.starts_with(StringRef(S, N - 1));  in startswith()
32 /// Identify the magic in magic.
33 file_magic llvm::identify_magic(StringRef Magic) {  in identify_magic()  argument
34   if (Magic.size() < 4)  in identify_magic()
36   switch ((unsigned char)Magic[0]) {  in identify_magic()
39     if (startswith(Magic, "\0\0\xFF\xFF")) {  in identify_magic()
42       if (Magic.size() < MinSize)  in identify_magic()
45       const char *Start = Magic.data() + offsetof(COFF::BigObjHeader, UUID);  in identify_magic()
53     if (Magic.size() >= sizeof(COFF::WinResMagic) &&  in identify_magic()
54         memcmp(Magic.data(), COFF::WinResMagic, sizeof(COFF::WinResMagic)) == 0)  in identify_magic()
57     if (Magic[1] == 0)  in identify_magic()
59     if (startswith(Magic, "\0asm"))  in identify_magic()
66     if (startswith(Magic, "\x01\xDF"))  in identify_magic()
68     if (startswith(Magic, "\x01\xF7"))  in identify_magic()
73     if (startswith(Magic, "\x03\xF0\x00"))  in identify_magic()
76     if (startswith(Magic, "\x03\x02\x23\x07"))  in identify_magic()
81     if (startswith(Magic, "\x07\x23\x02\x03"))  in identify_magic()
86     if (startswith(Magic, "\x10\xFF\x10\xAD"))  in identify_magic()
91     if (startswith(Magic, "\xDE\xC0\x17\x0B"))  in identify_magic()
95     if (startswith(Magic, "BC\xC0\xDE"))  in identify_magic()
99     if (startswith(Magic, "CCOB"))  in identify_magic()
101     if (startswith(Magic, "CPCH"))  in identify_magic()
105     if (startswith(Magic, "!<arch>\n") || startswith(Magic, "!<thin>\n"))  in identify_magic()
109     if (startswith(Magic, "<bigaf>\n"))  in identify_magic()
113     if (startswith(Magic, "\177ELF") && Magic.size() >= 18) {  in identify_magic()
114       bool Data2MSB = Magic[5] == 2;  in identify_magic()
117       if (Magic[high] == 0) {  in identify_magic()
118         switch (Magic[low]) {  in identify_magic()
137     if (startswith(Magic, "\xCA\xFE\xBA\xBE") ||  in identify_magic()
138         startswith(Magic, "\xCA\xFE\xBA\xBF")) {  in identify_magic()
140       // See the Mach-O section in /usr/share/file/magic for details.  in identify_magic()
141       if (Magic.size() >= 8 && Magic[7] < 43)  in identify_magic()
146   // The two magic numbers for mach-o are:  in identify_magic()
153     if (startswith(Magic, "\xFE\xED\xFA\xCE") ||  in identify_magic()
154         startswith(Magic, "\xFE\xED\xFA\xCF")) {  in identify_magic()
157       if (Magic[3] == char(0xCE))  in identify_magic()
161       if (Magic.size() >= MinSize)  in identify_magic()
162         type = Magic[12] << 24 | Magic[13] << 12 | Magic[14] << 8 | Magic[15];  in identify_magic()
163     } else if (startswith(Magic, "\xCE\xFA\xED\xFE") ||  in identify_magic()
164                startswith(Magic, "\xCF\xFA\xED\xFE")) {  in identify_magic()
167       if (Magic[0] == char(0xCE))  in identify_magic()
171       if (Magic.size() >= MinSize)  in identify_magic()
172         type = Magic[15] << 24 | Magic[14] << 12 | Magic[13] << 8 | Magic[12];  in identify_magic()
209     if (startswith(Magic, "\x50\xed\x55\xba"))  in identify_magic()
215     if (Magic[1] == 0x01)  in identify_magic()
221     if (Magic[1] == 0x02)  in identify_magic()
227     if (startswith(Magic, "MZ") && Magic.size() >= 0x3c + 4) {  in identify_magic()
228       uint32_t off = read32le(Magic.data() + 0x3c);  in identify_magic()
230       if (Magic.substr(off).starts_with(  in identify_magic()
234     if (Magic.starts_with("Microsoft C/C++ MSF 7.00\r\n"))  in identify_magic()
236     if (startswith(Magic, "MDMP"))  in identify_magic()
241     if (Magic[1] == char(0x86) || Magic[1] == char(0xaa))  in identify_magic()
246     if (startswith(Magic, "--- !tapi") || startswith(Magic, "---\narchs:"))  in identify_magic()
254     if (startswith(Magic, "DXBC"))  in identify_magic()
259     if (Magic[1] == char(0xA6))  in identify_magic()
264     if (Magic[1] == char(0xA6))  in identify_magic()
270     if (Magic.size() >= sizeof(OBMagic) && startswith(Magic, OBMagic))  in identify_magic()