diff options
Diffstat (limited to 'third_party/git/pack-check.c')
| -rw-r--r-- | third_party/git/pack-check.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/third_party/git/pack-check.c b/third_party/git/pack-check.c deleted file mode 100644 index 2cc3603189..0000000000 --- a/third_party/git/pack-check.c +++ /dev/null @@ -1,204 +0,0 @@ -#include "cache.h" -#include "repository.h" -#include "pack.h" -#include "pack-revindex.h" -#include "progress.h" -#include "packfile.h" -#include "object-store.h" - -struct idx_entry { - off_t offset; - union idx_entry_object { - const unsigned char *hash; - struct object_id *oid; - } oid; - unsigned int nr; -}; - -static int compare_entries(const void *e1, const void *e2) -{ - const struct idx_entry *entry1 = e1; - const struct idx_entry *entry2 = e2; - if (entry1->offset < entry2->offset) - return -1; - if (entry1->offset > entry2->offset) - return 1; - return 0; -} - -int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, - off_t offset, off_t len, unsigned int nr) -{ - const uint32_t *index_crc; - uint32_t data_crc = crc32(0, NULL, 0); - - do { - unsigned long avail; - void *data = use_pack(p, w_curs, offset, &avail); - if (avail > len) - avail = len; - data_crc = crc32(data_crc, data, avail); - offset += avail; - len -= avail; - } while (len); - - index_crc = p->index_data; - index_crc += 2 + 256 + p->num_objects * (the_hash_algo->rawsz/4) + nr; - - return data_crc != ntohl(*index_crc); -} - -static int verify_packfile(struct repository *r, - struct packed_git *p, - struct pack_window **w_curs, - verify_fn fn, - struct progress *progress, uint32_t base_count) - -{ - off_t index_size = p->index_size; - const unsigned char *index_base = p->index_data; - git_hash_ctx ctx; - unsigned char hash[GIT_MAX_RAWSZ], *pack_sig; - off_t offset = 0, pack_sig_ofs = 0; - uint32_t nr_objects, i; - int err = 0; - struct idx_entry *entries; - - if (!is_pack_valid(p)) - return error("packfile %s cannot be accessed", p->pack_name); - - the_hash_algo->init_fn(&ctx); - do { - unsigned long remaining; - unsigned char *in = use_pack(p, w_curs, offset, &remaining); - offset += remaining; - if (!pack_sig_ofs) - pack_sig_ofs = p->pack_size - the_hash_algo->rawsz; - if (offset > pack_sig_ofs) - remaining -= (unsigned int)(offset - pack_sig_ofs); - the_hash_algo->update_fn(&ctx, in, remaining); - } while (offset < pack_sig_ofs); - the_hash_algo->final_fn(hash, &ctx); - pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL); - if (!hasheq(hash, pack_sig)) - err = error("%s pack checksum mismatch", - p->pack_name); - if (!hasheq(index_base + index_size - the_hash_algo->hexsz, pack_sig)) - err = error("%s pack checksum does not match its index", - p->pack_name); - unuse_pack(w_curs); - - /* Make sure everything reachable from idx is valid. Since we - * have verified that nr_objects matches between idx and pack, - * we do not do scan-streaming check on the pack file. - */ - nr_objects = p->num_objects; - ALLOC_ARRAY(entries, nr_objects + 1); - entries[nr_objects].offset = pack_sig_ofs; - /* first sort entries by pack offset, since unpacking them is more efficient that way */ - for (i = 0; i < nr_objects; i++) { - entries[i].oid.hash = nth_packed_object_sha1(p, i); - if (!entries[i].oid.hash) - die("internal error pack-check nth-packed-object"); - entries[i].offset = nth_packed_object_offset(p, i); - entries[i].nr = i; - } - QSORT(entries, nr_objects, compare_entries); - - for (i = 0; i < nr_objects; i++) { - void *data; - enum object_type type; - unsigned long size; - off_t curpos; - int data_valid; - - if (p->index_version > 1) { - off_t offset = entries[i].offset; - off_t len = entries[i+1].offset - offset; - unsigned int nr = entries[i].nr; - if (check_pack_crc(p, w_curs, offset, len, nr)) - err = error("index CRC mismatch for object %s " - "from %s at offset %"PRIuMAX"", - oid_to_hex(entries[i].oid.oid), - p->pack_name, (uintmax_t)offset); - } - - curpos = entries[i].offset; - type = unpack_object_header(p, w_curs, &curpos, &size); - unuse_pack(w_curs); - - if (type == OBJ_BLOB && big_file_threshold <= size) { - /* - * Let check_object_signature() check it with - * the streaming interface; no point slurping - * the data in-core only to discard. - */ - data = NULL; - data_valid = 0; - } else { - data = unpack_entry(r, p, entries[i].offset, &type, &size); - data_valid = 1; - } - - if (data_valid && !data) - err = error("cannot unpack %s from %s at offset %"PRIuMAX"", - oid_to_hex(entries[i].oid.oid), p->pack_name, - (uintmax_t)entries[i].offset); - else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type))) - err = error("packed %s from %s is corrupt", - oid_to_hex(entries[i].oid.oid), p->pack_name); - else if (fn) { - int eaten = 0; - err |= fn(entries[i].oid.oid, type, size, data, &eaten); - if (eaten) - data = NULL; - } - if (((base_count + i) & 1023) == 0) - display_progress(progress, base_count + i); - free(data); - - } - display_progress(progress, base_count + i); - free(entries); - - return err; -} - -int verify_pack_index(struct packed_git *p) -{ - off_t index_size; - const unsigned char *index_base; - git_hash_ctx ctx; - unsigned char hash[GIT_MAX_RAWSZ]; - int err = 0; - - if (open_pack_index(p)) - return error("packfile %s index not opened", p->pack_name); - index_size = p->index_size; - index_base = p->index_data; - - /* Verify SHA1 sum of the index file */ - the_hash_algo->init_fn(&ctx); - the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - the_hash_algo->rawsz)); - the_hash_algo->final_fn(hash, &ctx); - if (!hasheq(hash, index_base + index_size - the_hash_algo->rawsz)) - err = error("Packfile index for %s hash mismatch", - p->pack_name); - return err; -} - -int verify_pack(struct repository *r, struct packed_git *p, verify_fn fn, - struct progress *progress, uint32_t base_count) -{ - int err = 0; - struct pack_window *w_curs = NULL; - - err |= verify_pack_index(p); - if (!p->index_data) - return -1; - - err |= verify_packfile(r, p, &w_curs, fn, progress, base_count); - unuse_pack(&w_curs); - - return err; -} |