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sha1dc: build git plumbing code more explicitly

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The plumbing code between sha1dc and git is defined in
sha1dc_git.[ch], but these aren't compiled / included directly but
only via the indirect inclusion from sha1dc code.  This is slightly
confusing when you try to trace the build flow.

This patch brings the following changes for simplification:

  - Make sha1dc_git.c stand-alone and build from Makefile

  - sha1dc_git.h is the common header to include further sha1.h
    depending on the build condition

  - Move comments for plumbing codes from the header to definitions

This is also meant as a preliminary work for further plumbing with
external sha1dc shlib.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Takashi Iwai 2017-08-15 14:04:16 +02:00 committed by Junio C Hamano
parent 5800c63717
commit 36f048c5e4
4 changed files with 17 additions and 23 deletions
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5
Makefile
View File

@ -1472,6 +1472,8 @@ ifdef APPLE_COMMON_CRYPTO
BASIC_CFLAGS += -DSHA1_APPLE
else
DC_SHA1 := YesPlease
BASIC_CFLAGS += -DSHA1_DC
LIB_OBJS += sha1dc_git.o
ifdef DC_SHA1_SUBMODULE
LIB_OBJS += sha1collisiondetection/lib/sha1.o
LIB_OBJS += sha1collisiondetection/lib/ubc_check.o
@ -1481,12 +1483,9 @@ else
LIB_OBJS += sha1dc/ubc_check.o
endif
BASIC_CFLAGS += \
-DSHA1_DC \
-DSHA1DC_NO_STANDARD_INCLUDES \
-DSHA1DC_INIT_SAFE_HASH_DEFAULT=0 \
-DSHA1DC_CUSTOM_INCLUDE_SHA1_C="\"cache.h\"" \
-DSHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_C="\"sha1dc_git.c\"" \
-DSHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_H="\"sha1dc_git.h\"" \
-DSHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C="\"git-compat-util.h\""
endif
endif

6
hash.h
View File

@ -8,11 +8,7 @@
#elif defined(SHA1_OPENSSL)
#include <openssl/sha.h>
#elif defined(SHA1_DC)
#ifdef DC_SHA1_SUBMODULE
#include "sha1collisiondetection/lib/sha1.h"
#else
#include "sha1dc/sha1.h"
#endif
#include "sha1dc_git.h"
#else /* SHA1_BLK */
#include "block-sha1/sha1.h"
#endif

11
sha1dc_git.c
View File

@ -1,8 +1,8 @@
/*
* This code is included at the end of sha1dc/sha1.c with the
* SHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_C macro.
*/
#include "cache.h"
/*
* Same as SHA1DCFinal, but convert collision attack case into a verbose die().
*/
void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
{
if (!SHA1DCFinal(hash, ctx))
@ -11,6 +11,9 @@ void git_SHA1DCFinal(unsigned char hash[20], SHA1_CTX *ctx)
sha1_to_hex(hash));
}
/*
* Same as SHA1DCUpdate, but adjust types to match git's usual interface.
*/
void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *vdata, unsigned long len)
{
const char *data = vdata;

18
sha1dc_git.h
View File

@ -1,16 +1,12 @@
/*
* This code is included at the end of sha1dc/sha1.h with the
* SHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_H macro.
*/
/* Plumbing with collition-detecting SHA1 code */
#ifdef DC_SHA1_SUBMODULE
#include "sha1collisiondetection/lib/sha1.h"
#else
#include "sha1dc/sha1.h"
#endif
/*
* Same as SHA1DCFinal, but convert collision attack case into a verbose die().
*/
void git_SHA1DCFinal(unsigned char [20], SHA1_CTX *);
/*
* Same as SHA1DCUpdate, but adjust types to match git's usual interface.
*/
void git_SHA1DCUpdate(SHA1_CTX *ctx, const void *data, unsigned long len);
#define platform_SHA_CTX SHA1_CTX