Now that `get_oid_hex_segment()` does less, it makes sense to rename
it and simplify its semantics:
* Instead of a `hex_len` parameter, which was the number of hex
characters (and had to be even), use a `len` parameter, which is the
number of resulting bytes. This removes then need for the check that
`hex_len` is even and to divide it by two to determine the number of
bytes. For good hygiene, declare the `len` parameter to be `size_t`
instead of `unsigned int`.
* Change the order of the arguments to the more traditional (dst,
src, len).
* Rename the function to `hex_to_bytes()`.
* Remove a loop variable: just count `len` down instead.
Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
notes.c | 28 ++++++++++------------------
1 file changed, 10 insertions(+), 18 deletions(-)
diff --git a/notes.c b/notes.c
index ce9ba36179..d5409b55e3 100644
--- a/notes.c
+++ b/notes.c
@@ -335,25 +335,18 @@ static void note_tree_free(struct int_node *tree)
}
/*
- * Convert a partial SHA1 hex string to the corresponding partial SHA1 value.
- * - hex - Partial SHA1 segment in ASCII hex format
- * - hex_len - Length of above segment. Must be multiple of 2 between 0 and 40
- * - oid - Partial SHA1 value is written here
- * Return 0 on success or -1 on error (invalid arguments or input not
- * in hex format).
+ * Read `len` pairs of hexadecimal digits from `hex` and write the
+ * values to `binary` as `len` bytes. Return 0 on success, or -1 if
+ * the input does not consist of hex digits).
*/
-static int get_oid_hex_segment(const char *hex, unsigned int hex_len,
- unsigned char *oid)
+static int hex_to_bytes(unsigned char *binary, const char *hex, size_t len)
{
- unsigned int i, len = hex_len >> 1;
- if (hex_len % 2 != 0)
- return -1;
- for (i = 0; i < len; i++) {
+ for (; len; len--, hex += 2) {
unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
+
if (val & ~0xff)
return -1;
- *oid++ = val;
- hex += 2;
+ *binary++ = val;
}
return 0;
}
@@ -438,8 +431,8 @@ static void load_subtree(struct notes_tree *t, struct
leaf_node *subtree,
/* notes must be blobs */
goto handle_non_note;
- if (get_oid_hex_segment(entry.path, path_len,
- object_oid.hash + prefix_len))
+ if (hex_to_bytes(object_oid.hash + prefix_len,
entry.path,
+ GIT_SHA1_RAWSZ - prefix_len))
goto handle_non_note; /* entry.path is not a
SHA1 */
type = PTR_TYPE_NOTE;
@@ -451,8 +444,7 @@ static void load_subtree(struct notes_tree *t, struct
leaf_node *subtree,
/* internal nodes must be trees */
goto handle_non_note;
- if (get_oid_hex_segment(entry.path, 2,
- object_oid.hash + len++))
+ if (hex_to_bytes(object_oid.hash + len++, entry.path,
1))
goto handle_non_note; /* entry.path is not a
SHA1 */
/*
--
2.11.0
