summaryrefslogtreecommitdiff
path: root/sha1_file.c
diff options
context:
space:
mode:
Diffstat (limited to 'sha1_file.c')
-rw-r--r--sha1_file.c218
1 files changed, 87 insertions, 131 deletions
diff --git a/sha1_file.c b/sha1_file.c
index 1d996a1990..72de38909e 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -35,61 +35,6 @@ static size_t sz_fmt(size_t s) { return s; }
const unsigned char null_sha1[20];
-const signed char hexval_table[256] = {
- -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
- 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
- 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
- -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
- -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
- -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
- -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
- -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
- -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
- -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
- -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
- -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
-};
-
-int get_sha1_hex(const char *hex, unsigned char *sha1)
-{
- int i;
- for (i = 0; i < 20; i++) {
- unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
- if (val & ~0xff)
- return -1;
- *sha1++ = val;
- hex += 2;
- }
- return 0;
-}
-
-static inline int offset_1st_component(const char *path)
-{
- if (has_dos_drive_prefix(path))
- return 2 + (path[2] == '/');
- return *path == '/';
-}
-
int safe_create_leading_directories(char *path)
{
char *pos = path + offset_1st_component(path);
@@ -133,24 +78,6 @@ int safe_create_leading_directories_const(const char *path)
return result;
}
-char *sha1_to_hex(const unsigned char *sha1)
-{
- static int bufno;
- static char hexbuffer[4][50];
- static const char hex[] = "0123456789abcdef";
- char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
- int i;
-
- for (i = 0; i < 20; i++) {
- unsigned int val = *sha1++;
- *buf++ = hex[val >> 4];
- *buf++ = hex[val & 0xf];
- }
- *buf = '\0';
-
- return buffer;
-}
-
static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
{
int i;
@@ -175,20 +102,22 @@ static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
*/
char *sha1_file_name(const unsigned char *sha1)
{
- static char *name, *base;
+ static char buf[PATH_MAX];
+ const char *objdir;
+ int len;
- if (!base) {
- const char *sha1_file_directory = get_object_directory();
- int len = strlen(sha1_file_directory);
- base = xmalloc(len + 60);
- memcpy(base, sha1_file_directory, len);
- memset(base+len, 0, 60);
- base[len] = '/';
- base[len+3] = '/';
- name = base + len + 1;
- }
- fill_sha1_path(name, sha1);
- return base;
+ objdir = get_object_directory();
+ len = strlen(objdir);
+
+ /* '/' + sha1(2) + '/' + sha1(38) + '\0' */
+ if (len + 43 > PATH_MAX)
+ die("insanely long object directory %s", objdir);
+ memcpy(buf, objdir, len);
+ buf[len] = '/';
+ buf[len+3] = '/';
+ buf[len+42] = '\0';
+ fill_sha1_path(buf + len + 1, sha1);
+ return buf;
}
static char *sha1_get_pack_name(const unsigned char *sha1,
@@ -672,6 +601,14 @@ void unuse_pack(struct pack_window **w_cursor)
}
}
+void close_pack_index(struct packed_git *p)
+{
+ if (p->index_data) {
+ munmap((void *)p->index_data, p->index_size);
+ p->index_data = NULL;
+ }
+}
+
/*
* This is used by git-repack in case a newly created pack happens to
* contain the same set of objects as an existing one. In that case
@@ -693,8 +630,7 @@ void free_pack_by_name(const char *pack_name)
close_pack_windows(p);
if (p->pack_fd != -1)
close(p->pack_fd);
- if (p->index_data)
- munmap((void *)p->index_data, p->index_size);
+ close_pack_index(p);
free(p->bad_object_sha1);
*pp = p->next;
free(p);
@@ -904,9 +840,8 @@ struct packed_git *add_packed_git(const char *path, int path_len, int local)
return p;
}
-struct packed_git *parse_pack_index(unsigned char *sha1)
+struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
{
- const char *idx_path = sha1_pack_index_name(sha1);
const char *path = sha1_pack_name(sha1);
struct packed_git *p = alloc_packed_git(strlen(path) + 1);
@@ -1232,7 +1167,7 @@ static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned lon
static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
{
int bytes = strlen(buffer) + 1;
- unsigned char *buf = xmalloc(1+size);
+ unsigned char *buf = xmallocz(size);
unsigned long n;
int status = Z_OK;
@@ -1260,7 +1195,6 @@ static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size
while (status == Z_OK)
status = git_inflate(stream, Z_FINISH);
}
- buf[size] = 0;
if (status == Z_STREAM_END && !stream->avail_in) {
git_inflate_end(stream);
return buf;
@@ -1583,17 +1517,18 @@ static void *unpack_compressed_entry(struct packed_git *p,
z_stream stream;
unsigned char *buffer, *in;
- buffer = xmalloc(size + 1);
- buffer[size] = 0;
+ buffer = xmallocz(size);
memset(&stream, 0, sizeof(stream));
stream.next_out = buffer;
- stream.avail_out = size;
+ stream.avail_out = size + 1;
git_inflate_init(&stream);
do {
in = use_pack(p, w_curs, curpos, &stream.avail_in);
stream.next_in = in;
st = git_inflate(&stream, Z_FINISH);
+ if (!stream.avail_out)
+ break; /* the payload is larger than it should be */
curpos += stream.next_in - in;
} while (st == Z_OK || st == Z_BUF_ERROR);
git_inflate_end(&stream);
@@ -2144,13 +2079,26 @@ static void *read_object(const unsigned char *sha1, enum object_type *type,
return read_packed_sha1(sha1, type, size);
}
-void *read_sha1_file(const unsigned char *sha1, enum object_type *type,
- unsigned long *size)
+void *read_sha1_file_repl(const unsigned char *sha1,
+ enum object_type *type,
+ unsigned long *size,
+ const unsigned char **replacement)
{
- void *data = read_object(sha1, type, size);
+ const unsigned char *repl = lookup_replace_object(sha1);
+ void *data = read_object(repl, type, size);
+
+ /* die if we replaced an object with one that does not exist */
+ if (!data && repl != sha1)
+ die("replacement %s not found for %s",
+ sha1_to_hex(repl), sha1_to_hex(sha1));
+
/* legacy behavior is to die on corrupted objects */
- if (!data && (has_loose_object(sha1) || has_packed_and_bad(sha1)))
- die("object %s is corrupted", sha1_to_hex(sha1));
+ if (!data && (has_loose_object(repl) || has_packed_and_bad(repl)))
+ die("object %s is corrupted", sha1_to_hex(repl));
+
+ if (replacement)
+ *replacement = repl;
+
return data;
}
@@ -2259,7 +2207,7 @@ int move_temp_to_file(const char *tmpfile, const char *filename)
}
out:
- if (set_shared_perm(filename, (S_IFREG|0444)))
+ if (adjust_shared_perm(filename))
return error("unable to set permission to '%s'", filename);
return 0;
}
@@ -2315,7 +2263,7 @@ static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename)
}
memcpy(buffer, filename, dirlen);
strcpy(buffer + dirlen, "tmp_obj_XXXXXX");
- fd = mkstemp(buffer);
+ fd = git_mkstemp_mode(buffer, 0444);
if (fd < 0 && dirlen && errno == ENOENT) {
/* Make sure the directory exists */
memcpy(buffer, filename, dirlen);
@@ -2325,18 +2273,19 @@ static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename)
/* Try again */
strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX");
- fd = mkstemp(buffer);
+ fd = git_mkstemp_mode(buffer, 0444);
}
return fd;
}
static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
- void *buf, unsigned long len, time_t mtime)
+ const void *buf, unsigned long len, time_t mtime)
{
int fd, ret;
- size_t size;
- unsigned char *compressed;
+ unsigned char compressed[4096];
z_stream stream;
+ git_SHA_CTX c;
+ unsigned char parano_sha1[20];
char *filename;
static char tmpfile[PATH_MAX];
@@ -2354,36 +2303,40 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
/* Set it up */
memset(&stream, 0, sizeof(stream));
deflateInit(&stream, zlib_compression_level);
- size = 8 + deflateBound(&stream, len+hdrlen);
- compressed = xmalloc(size);
-
- /* Compress it */
stream.next_out = compressed;
- stream.avail_out = size;
+ stream.avail_out = sizeof(compressed);
+ git_SHA1_Init(&c);
/* First header.. */
stream.next_in = (unsigned char *)hdr;
stream.avail_in = hdrlen;
while (deflate(&stream, 0) == Z_OK)
/* nothing */;
+ git_SHA1_Update(&c, hdr, hdrlen);
/* Then the data itself.. */
- stream.next_in = buf;
+ stream.next_in = (void *)buf;
stream.avail_in = len;
- ret = deflate(&stream, Z_FINISH);
+ do {
+ unsigned char *in0 = stream.next_in;
+ ret = deflate(&stream, Z_FINISH);
+ git_SHA1_Update(&c, in0, stream.next_in - in0);
+ if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
+ die("unable to write sha1 file");
+ stream.next_out = compressed;
+ stream.avail_out = sizeof(compressed);
+ } while (ret == Z_OK);
+
if (ret != Z_STREAM_END)
die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
-
ret = deflateEnd(&stream);
if (ret != Z_OK)
die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
+ git_SHA1_Final(parano_sha1, &c);
+ if (hashcmp(sha1, parano_sha1) != 0)
+ die("confused by unstable object source data for %s", sha1_to_hex(sha1));
- size = stream.total_out;
-
- if (write_buffer(fd, compressed, size) < 0)
- die("unable to write sha1 file");
close_sha1_file(fd);
- free(compressed);
if (mtime) {
struct utimbuf utb;
@@ -2397,7 +2350,7 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
return move_temp_to_file(tmpfile, filename);
}
-int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
+int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
{
unsigned char sha1[20];
char hdr[32];
@@ -2443,14 +2396,6 @@ int has_pack_index(const unsigned char *sha1)
return 1;
}
-int has_pack_file(const unsigned char *sha1)
-{
- struct stat st;
- if (stat(sha1_pack_name(sha1), &st))
- return 0;
- return 1;
-}
-
int has_sha1_pack(const unsigned char *sha1)
{
struct pack_entry e;
@@ -2495,6 +2440,8 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size,
return ret;
}
+#define SMALL_FILE_SIZE (32*1024)
+
int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
enum object_type type, const char *path)
{
@@ -2509,12 +2456,21 @@ int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
else
ret = -1;
strbuf_release(&sbuf);
- } else if (size) {
+ } else if (!size) {
+ ret = index_mem(sha1, NULL, size, write_object, type, path);
+ } else if (size <= SMALL_FILE_SIZE) {
+ char *buf = xmalloc(size);
+ if (size == read_in_full(fd, buf, size))
+ ret = index_mem(sha1, buf, size, write_object, type,
+ path);
+ else
+ ret = error("short read %s", strerror(errno));
+ free(buf);
+ } else {
void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
ret = index_mem(sha1, buf, size, write_object, type, path);
munmap(buf, size);
- } else
- ret = index_mem(sha1, NULL, size, write_object, type, path);
+ }
close(fd);
return ret;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-28 01:51:16 +0000