show-index.c: learn about index v2

When index v2 is encountered, the CRC32 of each object is also displayed
in parenthesis at the end of the line.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/show-index.c b/show-index.c
index a30a2de5d13931c590169cf30bd7004e23f2df1b..57ed9e87b7fca6c899d4c23d709a97dabce28106 100644 (file)
--- a/show-index.c
+++ b/show-index.c
@@ -1,14 +1,26 @@
 #include "cache.h"
+#include "pack.h"
 
 int main(int argc, char **argv)
 {
        int i;
        unsigned nr;
-       unsigned int entry[6];
+       unsigned int version;
        static unsigned int top_index[256];
 
-       if (fread(top_index, sizeof(top_index), 1, stdin) != 1)
-               die("unable to read index");
+       if (fread(top_index, 2 * 4, 1, stdin) != 1)
+               die("unable to read header");
+       if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
+               version = ntohl(top_index[1]);
+               if (version < 2 || version > 2)
+                       die("unknown index version");
+               if (fread(top_index, 256 * 4, 1, stdin) != 1)
+                       die("unable to read index");
+       } else {
+               version = 1;
+               if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
+                       die("unable to read index");
+       }
        nr = 0;
        for (i = 0; i < 256; i++) {
                unsigned n = ntohl(top_index[i]);
@@ -16,13 +28,51 @@ int main(int argc, char **argv)
                        die("corrupt index file");
                nr = n;
        }
-       for (i = 0; i < nr; i++) {
-               unsigned offset;
+       if (version == 1) {
+               for (i = 0; i < nr; i++) {
+                       unsigned int offset, entry[6];
 
-               if (fread(entry, 24, 1, stdin) != 1)
-                       die("unable to read entry %u/%u", i, nr);
-               offset = ntohl(entry[0]);
-               printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
+                       if (fread(entry, 4 + 20, 1, stdin) != 1)
+                               die("unable to read entry %u/%u", i, nr);
+                       offset = ntohl(entry[0]);
+                       printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
+               }
+       } else {
+               unsigned off64_nr = 0;
+               struct {
+                       unsigned char sha1[20];
+                       uint32_t crc;
+                       uint32_t off;
+               } *entries = xmalloc(nr * sizeof(entries[0]));
+               for (i = 0; i < nr; i++)
+                       if (fread(entries[i].sha1, 20, 1, stdin) != 1)
+                               die("unable to read sha1 %u/%u", i, nr);
+               for (i = 0; i < nr; i++)
+                       if (fread(&entries[i].crc, 4, 1, stdin) != 1)
+                               die("unable to read crc %u/%u", i, nr);
+               for (i = 0; i < nr; i++)
+                       if (fread(&entries[i].off, 4, 1, stdin) != 1)
+                               die("unable to read 32b offset %u/%u", i, nr);
+               for (i = 0; i < nr; i++) {
+                       uint64_t offset;
+                       uint32_t off = ntohl(entries[i].off);
+                       if (!(off & 0x80000000)) {
+                               offset = off;
+                       } else {
+                               uint32_t off64[2];
+                               if ((off & 0x7fffffff) != off64_nr)
+                                       die("inconsistent 64b offset index");
+                               if (fread(off64, 8, 1, stdin) != 1)
+                                       die("unable to read 64b offset %u", off64_nr);
+                               offset = (((uint64_t)ntohl(off64[0])) << 32) |
+                                                    ntohl(off64[1]);
+                               off64_nr++;
+                       }
+                       printf("%llu %s (%08x)\n", (unsigned long long) offset,
+                              sha1_to_hex(entries[i].sha1),
+                              ntohl(entries[i].crc));
+               }
+               free(entries);
        }
        return 0;
 }