Currently, we have functions that turn an arbitrary SHA-1 value or an
object ID into hex format, either using a static buffer or with a
user-provided buffer. Add variants of these functions that can handle
an arbitrary hash algorithm, specified by constant. Update the
documentation as well.
While we're at it, remove the "extern" declaration from this family of
functions, since it's not needed and our style now recommends against
it.
We use the variant taking the algorithm structure pointer as the
internal variant, since in the future we'll want to replace sha1_to_hex
with a hash_to_hex that handles the_hash_algo, and taking an algorithm
pointer is the easiest way to handle all of the variants in use.
Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
cache.h | 14 ++++++++------
hex.c | 32 ++++++++++++++++++++++++--------
2 files changed, 32 insertions(+), 14 deletions(-)
diff --git a/cache.h b/cache.h
index 4d014541ab..3cb953445c 100644
--- a/cache.h
+++ b/cache.h
@@ -1351,9 +1351,9 @@ extern int get_oid_hex(const char *hex, struct object_id *sha1);
extern int hex_to_bytes(unsigned char *binary, const char *hex, size_t len);
/*
- * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,
+ * Convert a binary hash to its hex equivalent. The `_r` variant is reentrant,
* and writes the NUL-terminated output to the buffer `out`, which must be at
- * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for
+ * least `GIT_MAX_HEXSZ + 1` bytes, and returns a pointer to out for
* convenience.
*
* The non-`_r` variant returns a static buffer, but uses a ring of 4
@@ -1361,10 +1361,12 @@ extern int hex_to_bytes(unsigned char *binary, const char *hex, size_t len);
*
* printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));
*/
-extern char *sha1_to_hex_r(char *out, const unsigned char *sha1);
-extern char *oid_to_hex_r(char *out, const struct object_id *oid);
-extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
-extern char *oid_to_hex(const struct object_id *oid); /* same static buffer as sha1_to_hex */
+char *hash_to_hex_algo_r(char *buffer, const unsigned char *hash, int algo);
+char *sha1_to_hex_r(char *out, const unsigned char *sha1);
+char *oid_to_hex_r(char *out, const struct object_id *oid);
+char *hash_to_hex_algo(const unsigned char *hash, int algo); /* static buffer result! */
+char *sha1_to_hex(const unsigned char *sha1); /* same static buffer */
+char *oid_to_hex(const struct object_id *oid); /* same static buffer */
/*
* Parse a 40-character hexadecimal object ID starting from hex, updating the
diff --git a/hex.c b/hex.c
index 10af1a29e8..870032a868 100644
--- a/hex.c
+++ b/hex.c
@@ -73,14 +73,15 @@ int parse_oid_hex(const char *hex, struct object_id *oid, const char **end)
return ret;
}
-char *sha1_to_hex_r(char *buffer, const unsigned char *sha1)
+static inline char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash,
+ const struct git_hash_algo *algop)
{
static const char hex[] = "0123456789abcdef";
char *buf = buffer;
int i;
- for (i = 0; i < the_hash_algo->rawsz; i++) {
- unsigned int val = *sha1++;
+ for (i = 0; i < algop->rawsz; i++) {
+ unsigned int val = *hash++;
*buf++ = hex[val >> 4];
*buf++ = hex[val & 0xf];
}
@@ -89,20 +90,35 @@ char *sha1_to_hex_r(char *buffer, const unsigned char *sha1)
return buffer;
}
-char *oid_to_hex_r(char *buffer, const struct object_id *oid)
+char *hash_to_hex_algo_r(char *buffer, const unsigned char *hash, int algo)
{
- return sha1_to_hex_r(buffer, oid->hash);
+ return hash_to_hex_algop_r(buffer, hash, &hash_algos[algo]);
}
-char *sha1_to_hex(const unsigned char *sha1)
+char *sha1_to_hex_r(char *buffer, const unsigned char *sha1)
+{
+ return hash_to_hex_algo_r(buffer, sha1, GIT_HASH_SHA1);
+}
+
+char *oid_to_hex_r(char *buffer, const struct object_id *oid)
+{
+ return hash_to_hex_algop_r(buffer, oid->hash, the_hash_algo);
+}
+
+char *hash_to_hex_algo(const unsigned char *hash, int algo)
{
static int bufno;
static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
- return sha1_to_hex_r(hexbuffer[bufno], sha1);
+ return hash_to_hex_algo_r(hexbuffer[bufno], hash, algo);
+}
+
+char *sha1_to_hex(const unsigned char *sha1)
+{
+ return hash_to_hex_algo(sha1, GIT_HASH_SHA1);
}
char *oid_to_hex(const struct object_id *oid)
{
- return sha1_to_hex(oid->hash);
+ return hash_to_hex_algo(oid->hash, hash_algo_by_ptr(the_hash_algo));
}
