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131 lines
2.9 KiB
131 lines
2.9 KiB
#include "cache.h" |
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#include "gettext.h" |
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#include "pack-mtimes.h" |
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#include "object-store.h" |
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#include "packfile.h" |
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static char *pack_mtimes_filename(struct packed_git *p) |
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{ |
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size_t len; |
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if (!strip_suffix(p->pack_name, ".pack", &len)) |
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BUG("pack_name does not end in .pack"); |
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return xstrfmt("%.*s.mtimes", (int)len, p->pack_name); |
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} |
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#define MTIMES_HEADER_SIZE (12) |
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struct mtimes_header { |
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uint32_t signature; |
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uint32_t version; |
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uint32_t hash_id; |
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}; |
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static int load_pack_mtimes_file(char *mtimes_file, |
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uint32_t num_objects, |
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const uint32_t **data_p, size_t *len_p) |
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{ |
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int fd, ret = 0; |
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struct stat st; |
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uint32_t *data = NULL; |
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size_t mtimes_size, expected_size; |
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struct mtimes_header header; |
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fd = git_open(mtimes_file); |
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if (fd < 0) { |
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ret = -1; |
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goto cleanup; |
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} |
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if (fstat(fd, &st)) { |
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ret = error_errno(_("failed to read %s"), mtimes_file); |
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goto cleanup; |
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} |
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mtimes_size = xsize_t(st.st_size); |
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if (mtimes_size < MTIMES_HEADER_SIZE) { |
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ret = error(_("mtimes file %s is too small"), mtimes_file); |
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goto cleanup; |
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} |
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data = xmmap(NULL, mtimes_size, PROT_READ, MAP_PRIVATE, fd, 0); |
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header.signature = ntohl(data[0]); |
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header.version = ntohl(data[1]); |
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header.hash_id = ntohl(data[2]); |
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if (header.signature != MTIMES_SIGNATURE) { |
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ret = error(_("mtimes file %s has unknown signature"), mtimes_file); |
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goto cleanup; |
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} |
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if (header.version != 1) { |
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ret = error(_("mtimes file %s has unsupported version %"PRIu32), |
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mtimes_file, header.version); |
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goto cleanup; |
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} |
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if (!(header.hash_id == 1 || header.hash_id == 2)) { |
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ret = error(_("mtimes file %s has unsupported hash id %"PRIu32), |
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mtimes_file, header.hash_id); |
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goto cleanup; |
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} |
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expected_size = MTIMES_HEADER_SIZE; |
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expected_size = st_add(expected_size, st_mult(sizeof(uint32_t), num_objects)); |
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expected_size = st_add(expected_size, 2 * (header.hash_id == 1 ? GIT_SHA1_RAWSZ : GIT_SHA256_RAWSZ)); |
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if (mtimes_size != expected_size) { |
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ret = error(_("mtimes file %s is corrupt"), mtimes_file); |
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goto cleanup; |
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} |
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cleanup: |
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if (ret) { |
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if (data) |
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munmap(data, mtimes_size); |
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} else { |
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*len_p = mtimes_size; |
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*data_p = data; |
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} |
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if (fd >= 0) |
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close(fd); |
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return ret; |
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} |
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int load_pack_mtimes(struct packed_git *p) |
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{ |
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char *mtimes_name = NULL; |
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int ret = 0; |
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if (!p->is_cruft) |
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return ret; /* not a cruft pack */ |
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if (p->mtimes_map) |
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return ret; /* already loaded */ |
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ret = open_pack_index(p); |
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if (ret < 0) |
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goto cleanup; |
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mtimes_name = pack_mtimes_filename(p); |
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ret = load_pack_mtimes_file(mtimes_name, |
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p->num_objects, |
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&p->mtimes_map, |
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&p->mtimes_size); |
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cleanup: |
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free(mtimes_name); |
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return ret; |
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} |
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uint32_t nth_packed_mtime(struct packed_git *p, uint32_t pos) |
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{ |
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if (!p->mtimes_map) |
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BUG("pack .mtimes file not loaded for %s", p->pack_name); |
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if (p->num_objects <= pos) |
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BUG("pack .mtimes out-of-bounds (%"PRIu32" vs %"PRIu32")", |
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pos, p->num_objects); |
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return get_be32(p->mtimes_map + pos + 3); |
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}
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