move encode_in_pack_object_header() to a better place

[thirdparty/git.git] / sha1_file.c

diff --git a/sha1_file.c b/sha1_file.c
index 8f5fe62d545ace21c338cd554c76bac5d5acb431..657825e14ef78c19649779fe89e1d09ae672901a 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -35,54 +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))
@@ -133,24 +85,6 @@ 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;
@@ -1170,7 +1104,7 @@ unsigned long unpack_object_header_buffer(const unsigned char *buf,
        size = c & 15;
        shift = 4;
        while (c & 0x80) {
-               if (len <= used || sizeof(long) * 8 <= shift) {
+               if (len <= used || bitsizeof(long) <= shift) {
                        error("bad object header");
                        return 0;
                }
@@ -1232,7 +1166,7 @@ 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 +1194,6 @@ 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 +1516,18 @@ 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 +2078,26 @@ 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;
 }
 
@@ -2286,7 +2233,7 @@ static void close_sha1_file(int fd)
        if (fsync_object_files)
                fsync_or_die(fd, "sha1 file");
        if (close(fd) != 0)
-               die("error when closing sha1 file (%s)", strerror(errno));
+               die_errno("error when closing sha1 file");
 }
 
 /* Size of directory component, including the ending '/' */
@@ -2443,14 +2390,6 @@ 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;