mirror of
https://github.com/git/git.git
synced 2024-11-05 00:37:55 +01:00
b212c0ca31
We moved away from SHA1_HEADER to a preprocessor if chain, but didn't update the comment discussing the platform defines. Update this comment so it reflects the current state of our codebase. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
#ifndef HASH_H
|
|
#define HASH_H
|
|
|
|
#include "git-compat-util.h"
|
|
|
|
#if defined(SHA1_PPC)
|
|
#include "ppc/sha1.h"
|
|
#elif defined(SHA1_APPLE)
|
|
#include <CommonCrypto/CommonDigest.h>
|
|
#elif defined(SHA1_OPENSSL)
|
|
#include <openssl/sha.h>
|
|
#elif defined(SHA1_DC)
|
|
#include "sha1dc_git.h"
|
|
#else /* SHA1_BLK */
|
|
#include "block-sha1/sha1.h"
|
|
#endif
|
|
|
|
#ifndef platform_SHA_CTX
|
|
/*
|
|
* platform's underlying implementation of SHA-1; could be OpenSSL,
|
|
* blk_SHA, Apple CommonCrypto, etc... Note that the relevant
|
|
* SHA-1 header may have already defined platform_SHA_CTX for our
|
|
* own implementations like block-sha1 and ppc-sha1, so we list
|
|
* the default for OpenSSL compatible SHA-1 implementations here.
|
|
*/
|
|
#define platform_SHA_CTX SHA_CTX
|
|
#define platform_SHA1_Init SHA1_Init
|
|
#define platform_SHA1_Update SHA1_Update
|
|
#define platform_SHA1_Final SHA1_Final
|
|
#endif
|
|
|
|
#define git_SHA_CTX platform_SHA_CTX
|
|
#define git_SHA1_Init platform_SHA1_Init
|
|
#define git_SHA1_Update platform_SHA1_Update
|
|
#define git_SHA1_Final platform_SHA1_Final
|
|
|
|
#ifdef SHA1_MAX_BLOCK_SIZE
|
|
#include "compat/sha1-chunked.h"
|
|
#undef git_SHA1_Update
|
|
#define git_SHA1_Update git_SHA1_Update_Chunked
|
|
#endif
|
|
|
|
/*
|
|
* Note that these constants are suitable for indexing the hash_algos array and
|
|
* comparing against each other, but are otherwise arbitrary, so they should not
|
|
* be exposed to the user or serialized to disk. To know whether a
|
|
* git_hash_algo struct points to some usable hash function, test the format_id
|
|
* field for being non-zero. Use the name field for user-visible situations and
|
|
* the format_id field for fixed-length fields on disk.
|
|
*/
|
|
/* An unknown hash function. */
|
|
#define GIT_HASH_UNKNOWN 0
|
|
/* SHA-1 */
|
|
#define GIT_HASH_SHA1 1
|
|
/* Number of algorithms supported (including unknown). */
|
|
#define GIT_HASH_NALGOS (GIT_HASH_SHA1 + 1)
|
|
|
|
/* A suitably aligned type for stack allocations of hash contexts. */
|
|
union git_hash_ctx {
|
|
git_SHA_CTX sha1;
|
|
};
|
|
typedef union git_hash_ctx git_hash_ctx;
|
|
|
|
typedef void (*git_hash_init_fn)(git_hash_ctx *ctx);
|
|
typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len);
|
|
typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx);
|
|
|
|
struct git_hash_algo {
|
|
/*
|
|
* The name of the algorithm, as appears in the config file and in
|
|
* messages.
|
|
*/
|
|
const char *name;
|
|
|
|
/* A four-byte version identifier, used in pack indices. */
|
|
uint32_t format_id;
|
|
|
|
/* The length of the hash in binary. */
|
|
size_t rawsz;
|
|
|
|
/* The length of the hash in hex characters. */
|
|
size_t hexsz;
|
|
|
|
/* The hash initialization function. */
|
|
git_hash_init_fn init_fn;
|
|
|
|
/* The hash update function. */
|
|
git_hash_update_fn update_fn;
|
|
|
|
/* The hash finalization function. */
|
|
git_hash_final_fn final_fn;
|
|
|
|
/* The OID of the empty tree. */
|
|
const struct object_id *empty_tree;
|
|
|
|
/* The OID of the empty blob. */
|
|
const struct object_id *empty_blob;
|
|
};
|
|
extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS];
|
|
|
|
#endif
|