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read-cache: abstract away uses of SHA-1

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Convert various uses of direct calls to SHA-1 and 20- and 40-based
constants to use the_hash_algo instead.  Don't yet convert the on-disk
data structures, which will be handled in a future commit.

Adjust some comments so as not to refer explicitly to SHA-1.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson 2018-02-01 02:18:45 +00:00 committed by Junio C Hamano
parent 81c58cd452
commit aab6135906
1 changed files with 29 additions and 29 deletions
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58
read-cache.c
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@ -1545,8 +1545,8 @@ int verify_ce_order;
static int verify_hdr(struct cache_header *hdr, unsigned long size)
{
git_SHA_CTX c;
unsigned char sha1[20];
git_hash_ctx c;
unsigned char hash[GIT_MAX_RAWSZ];
int hdr_version;
if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
@ -1558,10 +1558,10 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size)
if (!verify_index_checksum)
return 0;
git_SHA1_Init(&c);
git_SHA1_Update(&c, hdr, size - 20);
git_SHA1_Final(sha1, &c);
if (hashcmp(sha1, (unsigned char *)hdr + size - 20))
the_hash_algo->init_fn(&c);
the_hash_algo->update_fn(&c, hdr, size - the_hash_algo->rawsz);
the_hash_algo->final_fn(hash, &c);
if (hashcmp(hash, (unsigned char *)hdr + size - the_hash_algo->rawsz))
return error("bad index file sha1 signature");
return 0;
}
@ -1791,7 +1791,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
die_errno("cannot stat the open index");
mmap_size = xsize_t(st.st_size);
if (mmap_size < sizeof(struct cache_header) + 20)
if (mmap_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
die("index file smaller than expected");
mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
@ -1803,7 +1803,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
if (verify_hdr(hdr, mmap_size) < 0)
goto unmap;
hashcpy(istate->sha1, (const unsigned char *)hdr + mmap_size - 20);
hashcpy(istate->sha1, (const unsigned char *)hdr + mmap_size - the_hash_algo->rawsz);
istate->version = ntohl(hdr->hdr_version);
istate->cache_nr = ntohl(hdr->hdr_entries);
istate->cache_alloc = alloc_nr(istate->cache_nr);
@ -1831,7 +1831,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
istate->timestamp.sec = st.st_mtime;
istate->timestamp.nsec = ST_MTIME_NSEC(st);
while (src_offset <= mmap_size - 20 - 8) {
while (src_offset <= mmap_size - the_hash_algo->rawsz - 8) {
/* After an array of active_nr index entries,
* there can be arbitrary number of extended
* sections, each of which is prefixed with
@ -1957,11 +1957,11 @@ int unmerged_index(const struct index_state *istate)
static unsigned char write_buffer[WRITE_BUFFER_SIZE];
static unsigned long write_buffer_len;
static int ce_write_flush(git_SHA_CTX *context, int fd)
static int ce_write_flush(git_hash_ctx *context, int fd)
{
unsigned int buffered = write_buffer_len;
if (buffered) {
git_SHA1_Update(context, write_buffer, buffered);
the_hash_algo->update_fn(context, write_buffer, buffered);
if (write_in_full(fd, write_buffer, buffered) < 0)
return -1;
write_buffer_len = 0;
@ -1969,7 +1969,7 @@ static int ce_write_flush(git_SHA_CTX *context, int fd)
return 0;
}
static int ce_write(git_SHA_CTX *context, int fd, void *data, unsigned int len)
static int ce_write(git_hash_ctx *context, int fd, void *data, unsigned int len)
{
while (len) {
unsigned int buffered = write_buffer_len;
@ -1991,7 +1991,7 @@ static int ce_write(git_SHA_CTX *context, int fd, void *data, unsigned int len)
return 0;
}
static int write_index_ext_header(git_SHA_CTX *context, int fd,
static int write_index_ext_header(git_hash_ctx *context, int fd,
unsigned int ext, unsigned int sz)
{
ext = htonl(ext);
@ -2000,26 +2000,26 @@ static int write_index_ext_header(git_SHA_CTX *context, int fd,
(ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0;
}
static int ce_flush(git_SHA_CTX *context, int fd, unsigned char *sha1)
static int ce_flush(git_hash_ctx *context, int fd, unsigned char *hash)
{
unsigned int left = write_buffer_len;
if (left) {
write_buffer_len = 0;
git_SHA1_Update(context, write_buffer, left);
the_hash_algo->update_fn(context, write_buffer, left);
}
/* Flush first if not enough space for SHA1 signature */
if (left + 20 > WRITE_BUFFER_SIZE) {
/* Flush first if not enough space for hash signature */
if (left + the_hash_algo->rawsz > WRITE_BUFFER_SIZE) {
if (write_in_full(fd, write_buffer, left) < 0)
return -1;
left = 0;
}
/* Append the SHA1 signature at the end */
git_SHA1_Final(write_buffer + left, context);
hashcpy(sha1, write_buffer + left);
left += 20;
/* Append the hash signature at the end */
the_hash_algo->final_fn(write_buffer + left, context);
hashcpy(hash, write_buffer + left);
left += the_hash_algo->rawsz;
return (write_in_full(fd, write_buffer, left) < 0) ? -1 : 0;
}
@ -2100,7 +2100,7 @@ static void copy_cache_entry_to_ondisk(struct ondisk_cache_entry *ondisk,
}
}
static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce,
static int ce_write_entry(git_hash_ctx *c, int fd, struct cache_entry *ce,
struct strbuf *previous_name, struct ondisk_cache_entry *ondisk)
{
int size;
@ -2167,7 +2167,7 @@ static int verify_index_from(const struct index_state *istate, const char *path)
int fd;
ssize_t n;
struct stat st;
unsigned char sha1[20];
unsigned char hash[GIT_MAX_RAWSZ];
if (!istate->initialized)
return 0;
@ -2179,14 +2179,14 @@ static int verify_index_from(const struct index_state *istate, const char *path)
if (fstat(fd, &st))
goto out;
if (st.st_size < sizeof(struct cache_header) + 20)
if (st.st_size < sizeof(struct cache_header) + the_hash_algo->rawsz)
goto out;
n = pread_in_full(fd, sha1, 20, st.st_size - 20);
if (n != 20)
n = pread_in_full(fd, hash, the_hash_algo->rawsz, st.st_size - the_hash_algo->rawsz);
if (n != the_hash_algo->rawsz)
goto out;
if (hashcmp(istate->sha1, sha1))
if (hashcmp(istate->sha1, hash))
goto out;
close(fd);
@ -2235,7 +2235,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
int strip_extensions)
{
int newfd = tempfile->fd;
git_SHA_CTX c;
git_hash_ctx c;
struct cache_header hdr;
int i, err = 0, removed, extended, hdr_version;
struct cache_entry **cache = istate->cache;
@ -2273,7 +2273,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
hdr.hdr_version = htonl(hdr_version);
hdr.hdr_entries = htonl(entries - removed);
git_SHA1_Init(&c);
the_hash_algo->init_fn(&c);
if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0)
return -1;