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Lines 25-30
typedef struct {
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const size_t len; |
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const size_t len; |
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} magic_t; |
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} magic_t; |
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/* LZMA is some fuzzy crap */ |
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int is_magic_lzma(const char *buf) |
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{ |
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return (buf[0] == 0x5d && buf[4] < 0x20) && |
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(!memcmp(buf + 10, "\x00\x00\x00", 3) || |
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!memcmp(buf + 5, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8)); |
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} |
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#define magic_lzma_len 13 |
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static const unsigned char magic_gzip[] = { '\037', '\213', '\010' }; |
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static const unsigned char magic_gzip[] = { '\037', '\213', '\010' }; |
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static const unsigned char magic_bzip2[] = { 'B', 'Z', 'h' }; |
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static const unsigned char magic_bzip2[] = { 'B', 'Z', 'h' }; |
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static const unsigned char magic_xz[] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 }; |
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static const unsigned char magic_xz[] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 }; |
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Lines 36-47
static const magic_t magics[] = {
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#undef DECLARE_MAGIC_T |
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#undef DECLARE_MAGIC_T |
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}; |
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}; |
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#define MAGIC_SIZE_MIN 3 |
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#define MAGIC_SIZE_MIN 3 |
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#define MAGIC_SIZE_MAX 6 |
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#define MAGIC_SIZE_MAX 13 |
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static int show_magic; |
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static int magic_finish(const char *magic, size_t offset) |
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{ |
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if (show_magic) |
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printf("%s ", magic); |
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printf("%zu\n", offset); |
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return 0; |
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} |
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int main(int argc, char *argv[]) |
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int main(int argc, char *argv[]) |
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{ |
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{ |
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int show_magic = 0; |
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size_t i, read_cnt, offset, left, lzma_offset; |
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size_t i, read_cnt, offset, left; |
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FILE *fp = stdin; |
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FILE *fp = stdin; |
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char p[BUFSIZ]; |
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char p[BUFSIZ]; |
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Lines 56-61
int main(int argc, char *argv[])
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} |
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} |
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/* fp = fopen(argv[1], "r"); */ |
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/* fp = fopen(argv[1], "r"); */ |
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lzma_offset = 0; |
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offset = left = 0; |
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offset = left = 0; |
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while (1) { |
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while (1) { |
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read_cnt = fread(p + left, 1, sizeof(p) - left, fp); |
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read_cnt = fread(p + left, 1, sizeof(p) - left, fp); |
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Lines 69-80
int main(int argc, char *argv[])
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continue; |
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continue; |
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needle = memmem(p, sizeof(p), magics[i].magic, magics[i].len); |
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needle = memmem(p, sizeof(p), magics[i].magic, magics[i].len); |
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if (needle) { |
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if (needle) |
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if (show_magic) |
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return magic_finish(magics[i].type, offset + (needle - p)); |
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printf("%s ", magics[i].type); |
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} |
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printf("%zu\n", offset + (needle - p)); |
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return 0; |
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/* Scan for LZMA magic, but don't return yet ... */ |
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} |
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if (!lzma_offset && read_cnt + left >= magic_lzma_len) { |
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for (i = 0; i <= read_cnt + left - magic_lzma_len; ++i) |
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if (is_magic_lzma(p + i)) { |
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lzma_offset = offset + i; |
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break; |
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} |
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} |
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} |
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memmove(p, p + left + read_cnt - MAGIC_SIZE_MIN + 1, MAGIC_SIZE_MIN - 1); |
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memmove(p, p + left + read_cnt - MAGIC_SIZE_MIN + 1, MAGIC_SIZE_MIN - 1); |
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Lines 86-91
int main(int argc, char *argv[])
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} |
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} |
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} |
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} |
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/* Delay till the end for LZMA archives since it is too fuzzy */ |
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if (lzma_offset) |
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return magic_finish("lzma", lzma_offset); |
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if (ferror(stdin)) |
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if (ferror(stdin)) |
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perror(argv[0]); |
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perror(argv[0]); |
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