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40 lines
1019 B
C
40 lines
1019 B
C
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#include "cache.h"
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#include "pack.h"
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void fixup_pack_header_footer(int pack_fd,
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unsigned char *pack_file_sha1,
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const char *pack_name,
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uint32_t object_count)
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{
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static const int buf_sz = 128 * 1024;
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SHA_CTX c;
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struct pack_header hdr;
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char *buf;
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if (lseek(pack_fd, 0, SEEK_SET) != 0)
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die("Failed seeking to start: %s", strerror(errno));
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if (read_in_full(pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
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die("Unable to reread header of %s: %s", pack_name, strerror(errno));
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if (lseek(pack_fd, 0, SEEK_SET) != 0)
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die("Failed seeking to start: %s", strerror(errno));
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hdr.hdr_entries = htonl(object_count);
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write_or_die(pack_fd, &hdr, sizeof(hdr));
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SHA1_Init(&c);
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SHA1_Update(&c, &hdr, sizeof(hdr));
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buf = xmalloc(buf_sz);
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for (;;) {
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size_t n = xread(pack_fd, buf, buf_sz);
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if (!n)
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break;
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if (n < 0)
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die("Failed to checksum %s: %s", pack_name, strerror(errno));
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SHA1_Update(&c, buf, n);
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}
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free(buf);
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SHA1_Final(pack_file_sha1, &c);
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write_or_die(pack_fd, pack_file_sha1, 20);
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}
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