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c0566d78aa
Our hashmap.h helpfully defines a sha1hash() function. But it cannot define a similar oidhash() without including all of cache.h, which itself wants to include hashmap.h! Let's break this circular dependency by moving the definition to hash.h, along with the remaining RAWSZ macros, etc. That will put them with the existing git_hash_algo definition. One alternative would be to move oidhash() into cache.h, but it's already quite bloated. We're better off moving things out than in. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
167 lines
4.8 KiB
C
167 lines
4.8 KiB
C
#ifndef HASH_H
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#define HASH_H
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#include "git-compat-util.h"
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#if defined(SHA1_PPC)
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#include "ppc/sha1.h"
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#elif defined(SHA1_APPLE)
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#include <CommonCrypto/CommonDigest.h>
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#elif defined(SHA1_OPENSSL)
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#include <openssl/sha.h>
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#elif defined(SHA1_DC)
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#include "sha1dc_git.h"
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#else /* SHA1_BLK */
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#include "block-sha1/sha1.h"
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#endif
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#if defined(SHA256_GCRYPT)
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#include "sha256/gcrypt.h"
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#elif defined(SHA256_OPENSSL)
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#include <openssl/sha.h>
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#else
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#include "sha256/block/sha256.h"
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#endif
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#ifndef platform_SHA_CTX
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/*
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* platform's underlying implementation of SHA-1; could be OpenSSL,
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* blk_SHA, Apple CommonCrypto, etc... Note that the relevant
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* SHA-1 header may have already defined platform_SHA_CTX for our
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* own implementations like block-sha1 and ppc-sha1, so we list
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* the default for OpenSSL compatible SHA-1 implementations here.
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*/
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#define platform_SHA_CTX SHA_CTX
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#define platform_SHA1_Init SHA1_Init
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#define platform_SHA1_Update SHA1_Update
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#define platform_SHA1_Final SHA1_Final
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#endif
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#define git_SHA_CTX platform_SHA_CTX
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#define git_SHA1_Init platform_SHA1_Init
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#define git_SHA1_Update platform_SHA1_Update
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#define git_SHA1_Final platform_SHA1_Final
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#ifndef platform_SHA256_CTX
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#define platform_SHA256_CTX SHA256_CTX
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#define platform_SHA256_Init SHA256_Init
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#define platform_SHA256_Update SHA256_Update
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#define platform_SHA256_Final SHA256_Final
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#endif
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#define git_SHA256_CTX platform_SHA256_CTX
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#define git_SHA256_Init platform_SHA256_Init
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#define git_SHA256_Update platform_SHA256_Update
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#define git_SHA256_Final platform_SHA256_Final
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#ifdef SHA1_MAX_BLOCK_SIZE
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#include "compat/sha1-chunked.h"
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#undef git_SHA1_Update
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#define git_SHA1_Update git_SHA1_Update_Chunked
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#endif
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/*
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* Note that these constants are suitable for indexing the hash_algos array and
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* comparing against each other, but are otherwise arbitrary, so they should not
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* be exposed to the user or serialized to disk. To know whether a
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* git_hash_algo struct points to some usable hash function, test the format_id
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* field for being non-zero. Use the name field for user-visible situations and
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* the format_id field for fixed-length fields on disk.
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*/
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/* An unknown hash function. */
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#define GIT_HASH_UNKNOWN 0
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/* SHA-1 */
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#define GIT_HASH_SHA1 1
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/* SHA-256 */
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#define GIT_HASH_SHA256 2
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/* Number of algorithms supported (including unknown). */
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#define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1)
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/* A suitably aligned type for stack allocations of hash contexts. */
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union git_hash_ctx {
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git_SHA_CTX sha1;
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git_SHA256_CTX sha256;
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};
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typedef union git_hash_ctx git_hash_ctx;
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typedef void (*git_hash_init_fn)(git_hash_ctx *ctx);
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typedef void (*git_hash_update_fn)(git_hash_ctx *ctx, const void *in, size_t len);
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typedef void (*git_hash_final_fn)(unsigned char *hash, git_hash_ctx *ctx);
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struct git_hash_algo {
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/*
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* The name of the algorithm, as appears in the config file and in
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* messages.
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*/
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const char *name;
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/* A four-byte version identifier, used in pack indices. */
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uint32_t format_id;
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/* The length of the hash in binary. */
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size_t rawsz;
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/* The length of the hash in hex characters. */
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size_t hexsz;
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/* The block size of the hash. */
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size_t blksz;
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/* The hash initialization function. */
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git_hash_init_fn init_fn;
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/* The hash update function. */
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git_hash_update_fn update_fn;
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/* The hash finalization function. */
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git_hash_final_fn final_fn;
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/* The OID of the empty tree. */
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const struct object_id *empty_tree;
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/* The OID of the empty blob. */
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const struct object_id *empty_blob;
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};
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extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS];
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/*
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* Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if
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* the name doesn't match a known algorithm.
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*/
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int hash_algo_by_name(const char *name);
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/* Identical, except based on the format ID. */
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int hash_algo_by_id(uint32_t format_id);
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/* Identical, except based on the length. */
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int hash_algo_by_length(int len);
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/* Identical, except for a pointer to struct git_hash_algo. */
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static inline int hash_algo_by_ptr(const struct git_hash_algo *p)
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{
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return p - hash_algos;
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}
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/* The length in bytes and in hex digits of an object name (SHA-1 value). */
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#define GIT_SHA1_RAWSZ 20
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#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ)
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/* The block size of SHA-1. */
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#define GIT_SHA1_BLKSZ 64
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/* The length in bytes and in hex digits of an object name (SHA-256 value). */
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#define GIT_SHA256_RAWSZ 32
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#define GIT_SHA256_HEXSZ (2 * GIT_SHA256_RAWSZ)
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/* The block size of SHA-256. */
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#define GIT_SHA256_BLKSZ 64
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/* The length in byte and in hex digits of the largest possible hash value. */
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#define GIT_MAX_RAWSZ GIT_SHA256_RAWSZ
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#define GIT_MAX_HEXSZ GIT_SHA256_HEXSZ
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/* The largest possible block size for any supported hash. */
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#define GIT_MAX_BLKSZ GIT_SHA256_BLKSZ
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struct object_id {
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unsigned char hash[GIT_MAX_RAWSZ];
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};
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#define the_hash_algo the_repository->hash_algo
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#endif
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