mirror of
https://github.com/git/git.git
synced 2024-12-12 03:14:11 +08:00
a5031214c4
As the documentation says, this is primarily for debugging, and
in the longer term we should rename it to test-show-index or something.
In the meantime, just avoid xmalloc (which slurps in the rest of git), and
separating out the trivial hex functions into "hex.o".
This results in
[torvalds@nehalem git]$ size git-show-index
text data bss dec hex filename
222818 2276 112688 337782 52776 git-show-index (before)
5696 624 1264 7584 1da0 git-show-index (after)
which is a whole lot better.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#include "cache.h"
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#include "pack.h"
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static const char show_index_usage[] =
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"git show-index < <packed archive index>";
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int main(int argc, char **argv)
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{
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int i;
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unsigned nr;
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unsigned int version;
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static unsigned int top_index[256];
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if (argc != 1)
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usage(show_index_usage);
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if (fread(top_index, 2 * 4, 1, stdin) != 1)
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die("unable to read header");
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if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
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version = ntohl(top_index[1]);
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if (version < 2 || version > 2)
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die("unknown index version");
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if (fread(top_index, 256 * 4, 1, stdin) != 1)
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die("unable to read index");
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} else {
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version = 1;
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if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
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die("unable to read index");
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}
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nr = 0;
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for (i = 0; i < 256; i++) {
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unsigned n = ntohl(top_index[i]);
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if (n < nr)
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die("corrupt index file");
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nr = n;
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}
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if (version == 1) {
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for (i = 0; i < nr; i++) {
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unsigned int offset, entry[6];
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if (fread(entry, 4 + 20, 1, stdin) != 1)
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die("unable to read entry %u/%u", i, nr);
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offset = ntohl(entry[0]);
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printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
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}
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} else {
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unsigned off64_nr = 0;
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struct {
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unsigned char sha1[20];
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uint32_t crc;
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uint32_t off;
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} *entries = malloc(nr * sizeof(entries[0]));
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for (i = 0; i < nr; i++)
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if (fread(entries[i].sha1, 20, 1, stdin) != 1)
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die("unable to read sha1 %u/%u", i, nr);
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for (i = 0; i < nr; i++)
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if (fread(&entries[i].crc, 4, 1, stdin) != 1)
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die("unable to read crc %u/%u", i, nr);
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for (i = 0; i < nr; i++)
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if (fread(&entries[i].off, 4, 1, stdin) != 1)
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die("unable to read 32b offset %u/%u", i, nr);
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for (i = 0; i < nr; i++) {
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uint64_t offset;
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uint32_t off = ntohl(entries[i].off);
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if (!(off & 0x80000000)) {
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offset = off;
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} else {
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uint32_t off64[2];
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if ((off & 0x7fffffff) != off64_nr)
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die("inconsistent 64b offset index");
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if (fread(off64, 8, 1, stdin) != 1)
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die("unable to read 64b offset %u", off64_nr);
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offset = (((uint64_t)ntohl(off64[0])) << 32) |
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ntohl(off64[1]);
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off64_nr++;
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}
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printf("%" PRIuMAX " %s (%08"PRIx32")\n",
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(uintmax_t) offset,
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sha1_to_hex(entries[i].sha1),
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ntohl(entries[i].crc));
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}
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free(entries);
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}
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return 0;
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}
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