diff options
| -rw-r--r-- | Documentation/config.txt | 6 | ||||
| -rw-r--r-- | cache.h | 1 | ||||
| -rw-r--r-- | config.c | 5 | ||||
| -rw-r--r-- | environment.c | 1 | ||||
| -rw-r--r-- | sha1_file.c | 106 |
5 files changed, 111 insertions, 8 deletions
diff --git a/Documentation/config.txt b/Documentation/config.txt index 9d08dfceda..465eb13e76 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -97,6 +97,12 @@ core.compression:: compression, and 1..9 are various speed/size tradeoffs, 9 being slowest. +core.legacyheaders:: + A boolean which enables the legacy object header format in case + you want to interoperate with old clients accessing the object + database directly (where the "http://" and "rsync://" protocols + count as direct access). + alias.*:: Command aliases for the gitlink:git[1] command wrapper - e.g. after defining "alias.last = cat-file commit HEAD", the invocation @@ -176,6 +176,7 @@ extern int commit_lock_file(struct lock_file *); extern void rollback_lock_file(struct lock_file *); /* Environment bits from configuration mechanism */ +extern int use_legacy_headers; extern int trust_executable_bit; extern int assume_unchanged; extern int prefer_symlink_refs; @@ -279,6 +279,11 @@ int git_default_config(const char *var, const char *value) return 0; } + if (!strcmp(var, "core.legacyheaders")) { + use_legacy_headers = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "core.compression")) { int level = git_config_int(var, value); if (level == -1) diff --git a/environment.c b/environment.c index 97d42b172b..42f39d657e 100644 --- a/environment.c +++ b/environment.c @@ -11,6 +11,7 @@ char git_default_email[MAX_GITNAME]; char git_default_name[MAX_GITNAME]; +int use_legacy_headers = 1; int trust_executable_bit = 1; int assume_unchanged = 0; int prefer_symlink_refs = 0; diff --git a/sha1_file.c b/sha1_file.c index e666aec502..43bc2ea0cf 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -684,26 +684,74 @@ static void *map_sha1_file_internal(const unsigned char *sha1, return map; } -static int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) +static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) { + unsigned char c; + unsigned int word, bits; + unsigned long size; + static const char *typename[8] = { + NULL, /* OBJ_EXT */ + "commit", "tree", "blob", "tag", + NULL, NULL, NULL + }; + const char *type; + /* Get the data stream */ memset(stream, 0, sizeof(*stream)); stream->next_in = map; stream->avail_in = mapsize; stream->next_out = buffer; - stream->avail_out = size; + stream->avail_out = bufsiz; + + /* + * Is it a zlib-compressed buffer? If so, the first byte + * must be 0x78 (15-bit window size, deflated), and the + * first 16-bit word is evenly divisible by 31 + */ + word = (map[0] << 8) + map[1]; + if (map[0] == 0x78 && !(word % 31)) { + inflateInit(stream); + return inflate(stream, 0); + } + + c = *map++; + mapsize--; + type = typename[(c >> 4) & 7]; + if (!type) + return -1; + + bits = 4; + size = c & 0xf; + while ((c & 0x80)) { + if (bits >= 8*sizeof(long)) + return -1; + c = *map++; + size += (c & 0x7f) << bits; + bits += 7; + mapsize--; + } + /* Set up the stream for the rest.. */ + stream->next_in = map; + stream->avail_in = mapsize; inflateInit(stream); - return inflate(stream, 0); + + /* And generate the fake traditional header */ + stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", type, size); + return 0; } static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) { int bytes = strlen(buffer) + 1; unsigned char *buf = xmalloc(1+size); + unsigned long n; - memcpy(buf, (char *) buffer + bytes, stream->total_out - bytes); - bytes = stream->total_out - bytes; + n = stream->total_out - bytes; + if (n > size) + n = size; + memcpy(buf, (char *) buffer + bytes, n); + bytes = n; if (bytes < size) { stream->next_out = buf + bytes; stream->avail_out = size - bytes; @@ -1412,6 +1460,49 @@ static int write_buffer(int fd, const void *buf, size_t len) return 0; } +static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) +{ + int hdr_len; + unsigned char c; + + c = (type << 4) | (len & 15); + len >>= 4; + hdr_len = 1; + while (len) { + *hdr++ = c | 0x80; + hdr_len++; + c = (len & 0x7f); + len >>= 7; + } + *hdr = c; + return hdr_len; +} + +static void setup_object_header(z_stream *stream, const char *type, unsigned long len) +{ + int obj_type, hdr; + + if (use_legacy_headers) { + while (deflate(stream, 0) == Z_OK) + /* nothing */; + return; + } + if (!strcmp(type, blob_type)) + obj_type = OBJ_BLOB; + else if (!strcmp(type, tree_type)) + obj_type = OBJ_TREE; + else if (!strcmp(type, commit_type)) + obj_type = OBJ_COMMIT; + else if (!strcmp(type, tag_type)) + obj_type = OBJ_TAG; + else + die("trying to generate bogus object of type '%s'", type); + hdr = write_binary_header(stream->next_out, obj_type, len); + stream->total_out = hdr; + stream->next_out += hdr; + stream->avail_out -= hdr; +} + int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) { int size; @@ -1457,7 +1548,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha /* Set it up */ memset(&stream, 0, sizeof(stream)); deflateInit(&stream, zlib_compression_level); - size = deflateBound(&stream, len+hdrlen); + size = 8 + deflateBound(&stream, len+hdrlen); compressed = xmalloc(size); /* Compress it */ @@ -1467,8 +1558,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha /* First header.. */ stream.next_in = hdr; stream.avail_in = hdrlen; - while (deflate(&stream, 0) == Z_OK) - /* nothing */; + setup_object_header(&stream, type, len); /* Then the data itself.. */ stream.next_in = buf; |