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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_oid_h__
#define INCLUDE_oid_h__
#include "common.h"
#include "git2/experimental.h"
#include "git2/oid.h"
#include "hash.h"
#ifdef GIT_EXPERIMENTAL_SHA256
# define GIT_OID_NONE { 0, { 0 } }
# define GIT_OID_INIT(type, ...) { type, __VA_ARGS__ }
#else
# define GIT_OID_NONE { { 0 } }
# define GIT_OID_INIT(type, ...) { __VA_ARGS__ }
#endif
extern const git_oid git_oid__empty_blob_sha1;
extern const git_oid git_oid__empty_tree_sha1;
GIT_INLINE(git_oid_t) git_oid_type(const git_oid *oid)
{
#ifdef GIT_EXPERIMENTAL_SHA256
return oid->type;
#else
GIT_UNUSED(oid);
return GIT_OID_SHA1;
#endif
}
GIT_INLINE(size_t) git_oid_size(git_oid_t type)
{
switch (type) {
case GIT_OID_SHA1:
return GIT_OID_SHA1_SIZE;
#ifdef GIT_EXPERIMENTAL_SHA256
case GIT_OID_SHA256:
return GIT_OID_SHA256_SIZE;
#endif
}
return 0;
}
GIT_INLINE(size_t) git_oid_hexsize(git_oid_t type)
{
switch (type) {
case GIT_OID_SHA1:
return GIT_OID_SHA1_HEXSIZE;
#ifdef GIT_EXPERIMENTAL_SHA256
case GIT_OID_SHA256:
return GIT_OID_SHA256_HEXSIZE;
#endif
}
return 0;
}
GIT_INLINE(git_hash_algorithm_t) git_oid_algorithm(git_oid_t type)
{
switch (type) {
case GIT_OID_SHA1:
return GIT_HASH_ALGORITHM_SHA1;
#ifdef GIT_EXPERIMENTAL_SHA256
case GIT_OID_SHA256:
return GIT_HASH_ALGORITHM_SHA256;
#endif
}
return 0;
}
/**
* Format a git_oid into a newly allocated c-string.
*
* The c-string is owned by the caller and needs to be manually freed.
*
* @param id the oid structure to format
* @return the c-string; NULL if memory is exhausted. Caller must
* deallocate the string with git__free().
*/
char *git_oid_allocfmt(const git_oid *id);
/**
* Format the requested nibbles of an object id.
*
* @param str the string to write into
* @param oid the oid structure to format
* @param start the starting number of nibbles
* @param count the number of nibbles to format
*/
GIT_INLINE(void) git_oid_fmt_substr(
char *str,
const git_oid *oid,
size_t start,
size_t count)
{
static char hex[] = "0123456789abcdef";
size_t i, end = start + count, min = start / 2, max = end / 2;
if (start & 1)
*str++ = hex[oid->id[min++] & 0x0f];
for (i = min; i < max; i++) {
*str++ = hex[oid->id[i] >> 4];
*str++ = hex[oid->id[i] & 0x0f];
}
if (end & 1)
*str++ = hex[oid->id[i] >> 4];
}
GIT_INLINE(int) git_oid_raw_ncmp(
const unsigned char *sha1,
const unsigned char *sha2,
size_t len)
{
if (len > GIT_OID_MAX_HEXSIZE)
len = GIT_OID_MAX_HEXSIZE;
while (len > 1) {
if (*sha1 != *sha2)
return 1;
sha1++;
sha2++;
len -= 2;
};
if (len)
if ((*sha1 ^ *sha2) & 0xf0)
return 1;
return 0;
}
GIT_INLINE(int) git_oid_raw_cmp(
const unsigned char *sha1,
const unsigned char *sha2,
size_t size)
{
return memcmp(sha1, sha2, size);
}
GIT_INLINE(int) git_oid_raw_cpy(
unsigned char *dst,
const unsigned char *src,
size_t size)
{
memcpy(dst, src, size);
return 0;
}
/*
* 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.
*/
GIT_INLINE(int) git_oid__cmp(const git_oid *a, const git_oid *b)
{
#ifdef GIT_EXPERIMENTAL_SHA256
if (a->type != b->type)
return a->type - b->type;
return git_oid_raw_cmp(a->id, b->id, git_oid_size(a->type));
#else
return git_oid_raw_cmp(a->id, b->id, git_oid_size(GIT_OID_SHA1));
#endif
}
GIT_INLINE(void) git_oid__cpy_prefix(
git_oid *out, const git_oid *id, size_t len)
{
#ifdef GIT_EXPERIMENTAL_SHA256
out->type = id->type;
#endif
memcpy(&out->id, id->id, (len + 1) / 2);
if (len & 1)
out->id[len / 2] &= 0xF0;
}
GIT_INLINE(bool) git_oid__is_hexstr(const char *str, git_oid_t type)
{
size_t i;
for (i = 0; str[i] != '\0'; i++) {
if (git__fromhex(str[i]) < 0)
return false;
}
return (i == git_oid_hexsize(type));
}
GIT_INLINE(void) git_oid_clear(git_oid *out, git_oid_t type)
{
memset(out->id, 0, git_oid_size(type));
#ifdef GIT_EXPERIMENTAL_SHA256
out->type = type;
#endif
}
/* SHA256 support */
int git_oid__fromstr(git_oid *out, const char *str, git_oid_t type);
int git_oid__fromstrp(git_oid *out, const char *str, git_oid_t type);
int git_oid__fromstrn(
git_oid *out,
const char *str,
size_t length,
git_oid_t type);
int git_oid__fromraw(git_oid *out, const unsigned char *raw, git_oid_t type);
#endif
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