oid: Uniformize ncmp methods

Drop redundant methods. The ncmp method is now public

include/git2/oid.h

@@ -55,6 +55,7 @@ typedef struct {
 
 /**
  * Parse a hex formatted object id into a git_oid.
+ *
  * @param out oid structure the result is written into.
  * @param str input hex string; must be pointing at the start of
  *        the hex sequence and have at least the number of bytes
@@ -65,6 +66,7 @@ GIT_EXTERN(int) git_oid_fromstr(git_oid *out, const char *str);
 
 /**
  * Copy an already raw oid into a git_oid structure.
+ *
  * @param out oid structure the result is written into.
  * @param raw the raw input bytes to be copied.
  */
@@ -72,6 +74,7 @@ GIT_EXTERN(void) git_oid_fromraw(git_oid *out, const unsigned char *raw);
 
 /**
  * Format a git_oid into a hex string.
+ *
  * @param str output hex string; must be pointing at the start of
  *        the hex sequence and have at least the number of bytes
  *        needed for an oid encoded in hex (40 bytes).  Only the
@@ -83,7 +86,7 @@ GIT_EXTERN(void) git_oid_fmt(char *str, const git_oid *oid);
 
 /**
  * Format a git_oid into a loose-object path string.
- * <p>
+ *
  * The resulting string is "aa/...", where "aa" is the first two
  * hex digitis of the oid and "..." is the remaining 38 digits.
  *
@@ -98,6 +101,7 @@ GIT_EXTERN(void) git_oid_pathfmt(char *str, const git_oid *oid);
 
 /**
  * Format a git_oid into a newly allocated c-string.
+ *
  * @param oid the oid structure to format
  * @return the c-string; NULL if memory is exhausted.  Caller must
  *         deallocate the string with free().
@@ -106,7 +110,7 @@ GIT_EXTERN(char *) git_oid_allocfmt(const git_oid *oid);
 
 /**
  * Format a git_oid into a buffer as a hex format c-string.
- * <p>
+ *
  * If the buffer is smaller than GIT_OID_HEXSZ+1, then the resulting
  * oid c-string will be truncated to n-1 characters. If there are
  * any input parameter errors (out == NULL, n == 0, oid == NULL),
@@ -123,6 +127,7 @@ GIT_EXTERN(char *) git_oid_to_string(char *out, size_t n, const git_oid *oid);
 
 /**
  * Copy an oid from one structure to another.
+ *
  * @param out oid structure the result is written into.
  * @param src oid structure to copy from.
  */
@@ -130,6 +135,7 @@ GIT_EXTERN(void) git_oid_cpy(git_oid *out, const git_oid *src);
 
 /**
  * Compare two oid structures.
+ *
  * @param a first oid structure.
  * @param b second oid structure.
  * @return <0, 0, >0 if a < b, a == b, a > b.
@@ -139,12 +145,13 @@ GIT_EXTERN(int) git_oid_cmp(const git_oid *a, const git_oid *b);
 /**
  * Compare the first 'len' hexadecimal characters (packets of 4 bits)
  * of two oid structures.
- * @param len the number of hex chars to compare
+ *
  * @param a first oid structure.
  * @param b second oid structure.
+ * @param len the number of hex chars to compare
  * @return 0 in case of a match
  */
-GIT_EXTERN(int) git_oid_ncmp(unsigned int len, git_oid *a, git_oid *b);
+GIT_EXTERN(int) git_oid_ncmp(const git_oid *a, const git_oid *b, unsigned int len);
 
 /**
  * OID Shortener object

src/odb_loose.c

@@ -26,10 +26,10 @@
 #include "common.h"
 #include "git2/zlib.h"
 #include "git2/object.h"
+#include "git2/oid.h"
 #include "fileops.h"
 #include "hash.h"
 #include "odb.h"
-#include "oid.h"
 #include "delta-apply.h"
 #include "filebuf.h"
 
@@ -491,8 +491,12 @@ int fn_locate_object_short_oid(void *state, char *pathbuf) {
 	}
 
 	if (!gitfo_exists(pathbuf) && gitfo_isdir(pathbuf)) {
-		/* We are already in the directory matching the 2 first hex characters */
-		if (!git_oid_ncmp_hex(sstate->short_oid_len-2, sstate->short_oid+2, (unsigned char *)pathbuf + sstate->dir_len)) {
+		/* We are already in the directory matching the 2 first hex characters,
+		 * compare the first ncmp characters of the oids */
+		if (!memcmp(sstate->short_oid + 2,
+			(unsigned char *)pathbuf + sstate->dir_len,
+			sstate->short_oid_len - 2)) {
+
 			if (!sstate->found) {
 				sstate->res_oid[0] = sstate->short_oid[0];
 				sstate->res_oid[1] = sstate->short_oid[1];

src/odb_pack.c

@@ -26,10 +26,10 @@
 #include "common.h"
 #include "git2/zlib.h"
 #include "git2/repository.h"
+#include "git2/oid.h"
 #include "fileops.h"
 #include "hash.h"
 #include "odb.h"
-#include "oid.h"
 #include "delta-apply.h"
 #include "sha1_lookup.h"
 
@@ -1011,7 +1011,7 @@ static int pack_entry_find_offset(
 		if (pos < (int)p->num_objects) {
 			current = index + pos * stride;
 
-			if (!git_oid_ncmp_raw(len, short_oid->id, current)) {
+			if (!git_oid_ncmp(short_oid, (const git_oid *)current, len)) {
 				found = 1;
 			}
 		}
@@ -1021,7 +1021,7 @@ static int pack_entry_find_offset(
 		/* Check for ambiguousity */
 		const unsigned char *next = current + stride;
 
-		if (!git_oid_ncmp_raw(len, short_oid->id, next)) {
+		if (!git_oid_ncmp(short_oid, (const git_oid *)next, len)) {
 			found = 2;
 		}
 	}

src/oid.c

@@ -172,9 +172,11 @@ int git_oid_cmp(const git_oid *a, const git_oid *b)
 	return memcmp(a->id, b->id, sizeof(a->id));
 }
 
-
-int git_oid_ncmp_raw(unsigned int len, const unsigned char *a, const unsigned char *b)
+int git_oid_ncmp(const git_oid *oid_a, const git_oid *oid_b, unsigned int len)
 {
+	const unsigned char *a = oid_a->id;
+	const unsigned char *b = oid_b->id;
+
 	do {
 		if (*a != *b)
 			return 1;
@@ -182,20 +184,12 @@ int git_oid_ncmp_raw(unsigned int len, const unsigned char *a, const unsigned ch
 		b++;
 		len -= 2;
 	} while (len > 1);
+
 	if (len)
 		if ((*a ^ *b) & 0xf0)
 			return 1;
-        return 0;
-}
 
-int git_oid_ncmp_hex(unsigned int len, const unsigned char *a, const unsigned char *b)
-{
-	return memcmp(a, b, len);
-}
-
-int git_oid_ncmp(unsigned int len, git_oid *a, git_oid *b)
-{
-	return git_oid_ncmp_raw(len, a->id, b->id);
+	return 0;
 }
 
 typedef short node_index;

src/oid.h

-#ifndef INCLUDE_oid_h__
-#define INCLUDE_oid_h__
-
-/**
- * Compare the first ('len'*4) bits of two raw formatted oids.
- * This can be useful for internal use.
- * Return 0 if they match.
- */
-int git_oid_ncmp_raw(unsigned int len, const unsigned char *a, const unsigned char *b);
-
-/**
- * Compare the first 'len' characters of two hex formatted oids.
- * Return 0 if they match.
- */
-int git_oid_ncmp_hex(unsigned int len, const unsigned char *a, const unsigned char *b);
-
-#endif