hash: move SHA1 implementations into 'sha1/' folder

As we will include additional hash algorithms in the future due
to upstream git discussing a move away from SHA1, we should
accomodate for that and prepare for the move. As a first step,
move all SHA1 implementations into a common subdirectory.

Also, create a SHA1-specific header file that lives inside the
hash folder. This header will contain the SHA1-specific header
includes, function declarations and the SHA1 context structure.

cmake/Modules/SelectHashes.cmake

@@ -30,7 +30,7 @@ IF(SHA1_BACKEND STREQUAL "CollisionDetection")
 	ADD_DEFINITIONS(-DSHA1DC_NO_STANDARD_INCLUDES=1)
 	ADD_DEFINITIONS(-DSHA1DC_CUSTOM_INCLUDE_SHA1_C=\"common.h\")
 	ADD_DEFINITIONS(-DSHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C=\"common.h\")
-	FILE(GLOB SRC_SHA1 hash/hash_collisiondetect.c hash/sha1dc/*)
+	FILE(GLOB SRC_SHA1 hash/sha1/collisiondetect.c hash/sha1/sha1dc/*)
 ELSEIF(SHA1_BACKEND STREQUAL "OpenSSL")
 	# OPENSSL_FOUND should already be set, we're checking HTTPS_BACKEND
 
@@ -40,13 +40,13 @@ ELSEIF(SHA1_BACKEND STREQUAL "OpenSSL")
 	ELSE()
 		LIST(APPEND LIBGIT2_PC_REQUIRES "openssl")
 	ENDIF()
-	FILE(GLOB SRC_SHA1 hash/hash_openssl.c)
+	FILE(GLOB SRC_SHA1 hash/sha1/openssl.c)
 ELSEIF(SHA1_BACKEND STREQUAL "CommonCrypto")
 	SET(GIT_SHA1_COMMON_CRYPTO 1)
-	FILE(GLOB SRC_SHA1 hash/hash_common_crypto.c)
+	FILE(GLOB SRC_SHA1 hash/sha1/common_crypto.c)
 ELSEIF(SHA1_BACKEND STREQUAL "mbedTLS")
 	SET(GIT_SHA1_MBEDTLS 1)
-	FILE(GLOB SRC_SHA1 hash/hash_mbedtls.c)
+	FILE(GLOB SRC_SHA1 hash/sha1/mbedtls.c)
 	LIST(APPEND LIBGIT2_SYSTEM_INCLUDES ${MBEDTLS_INCLUDE_DIR})
 	LIST(APPEND LIBGIT2_LIBS ${MBEDTLS_LIBRARIES})
 	# mbedTLS has no pkgconfig file, hence we can't require it
@@ -55,9 +55,9 @@ ELSEIF(SHA1_BACKEND STREQUAL "mbedTLS")
 	LIST(APPEND LIBGIT2_PC_LIBS ${MBEDTLS_LIBRARIES})
 ELSEIF(SHA1_BACKEND STREQUAL "Win32")
 	SET(GIT_SHA1_WIN32 1)
-	FILE(GLOB SRC_SHA1 hash/hash_win32.c)
+	FILE(GLOB SRC_SHA1 hash/sha1/win32.c)
 ELSEIF(SHA1_BACKEND STREQUAL "Generic")
-	FILE(GLOB SRC_SHA1 hash/hash_generic.c)
+	FILE(GLOB SRC_SHA1 hash/sha1/generic.c)
 # ELSEIF(NOT USE_SHA1)
 ELSE()
 	MESSAGE(FATAL_ERROR "Asked for unknown SHA1 backend: ${SHA1_BACKEND}")

src/hash.h

@@ -4,6 +4,7 @@
  * 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_hash_h__
 #define INCLUDE_hash_h__
 
@@ -18,19 +19,7 @@ typedef struct {
 	size_t len;
 } git_buf_vec;
 
-#if defined(GIT_SHA1_COLLISIONDETECT)
-# include "hash/hash_collisiondetect.h"
-#elif defined(GIT_SHA1_COMMON_CRYPTO)
-# include "hash/hash_common_crypto.h"
-#elif defined(GIT_SHA1_OPENSSL)
-# include "hash/hash_openssl.h"
-#elif defined(GIT_SHA1_WIN32)
-# include "hash/hash_win32.h"
-#elif defined(GIT_SHA1_MBEDTLS)
-# include "hash/hash_mbedtls.h"
-#else
-# include "hash/hash_generic.h"
-#endif
+#include "hash/sha1.h"
 
 int git_hash_global_init(void);
 

src/hash/sha1.h

@@ -0,0 +1,27 @@
+/*
+ * 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_hash_sha1_h__
+#define INCLUDE_hash_sha1_h__
+
+#include "common.h"
+
+#if defined(GIT_SHA1_COLLISIONDETECT)
+# include "sha1/collisiondetect.h"
+#elif defined(GIT_SHA1_COMMON_CRYPTO)
+# include "sha1/common_crypto.h"
+#elif defined(GIT_SHA1_OPENSSL)
+# include "sha1/openssl.h"
+#elif defined(GIT_SHA1_WIN32)
+# include "sha1/win32.h"
+#elif defined(GIT_SHA1_MBEDTLS)
+# include "sha1/mbedtls.h"
+#else
+# include "sha1/generic.h"
+#endif
+
+#endif

src/hash/sha1/collisiondetect.c

@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "hash_collisiondetect.h"
+#include "collisiondetect.h"
 
 int git_hash_global_init(void)
 {

src/hash/sha1/collisiondetect.h

@@ -5,8 +5,8 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#ifndef INCLUDE_hash_hash_collisiondetect_h__
-#define INCLUDE_hash_hash_collisiondetect_h__
+#ifndef INCLUDE_hash_sha1_collisiondetect_h__
+#define INCLUDE_hash_sha1_collisiondetect_h__
 
 #include "hash.h"
 

src/hash/sha1/common_crypto.c

@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "hash_common_crypto.h"
+#include "common_crypto.h"
 
 #define CC_LONG_MAX ((CC_LONG)-1)
 

src/hash/sha1/common_crypto.h

@@ -5,8 +5,8 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#ifndef INCLUDE_hash_hash_common_crypto_h__
-#define INCLUDE_hash_hash_common_crypto_h__
+#ifndef INCLUDE_hash_sha1_common_crypto_h__
+#define INCLUDE_hash_sha1_common_crypto_h__
 
 #include "hash.h"
 

src/hash/sha1/generic.c

@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "hash_generic.h"
+#include "generic.h"
 
 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
 

src/hash/sha1/generic.h

@@ -5,8 +5,8 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#ifndef INCLUDE_hash_hash_generic_h__
-#define INCLUDE_hash_hash_generic_h__
+#ifndef INCLUDE_hash_sha1_generic_h__
+#define INCLUDE_hash_sha1_generic_h__
 
 #include "hash.h"
 

src/hash/sha1/mbedtls.c

@@ -5,9 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "common.h"
-#include "hash.h"
-#include "hash/hash_mbedtls.h"
+#include "mbedtls.h"
 
 int git_hash_global_init(void)
 {

src/hash/sha1/mbedtls.h

@@ -5,8 +5,8 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#ifndef INCLUDE_hash_mbedtld_h__
-#define INCLUDE_hash_mbedtld_h__
+#ifndef INCLUDE_hash_sha1_mbedtls_h__
+#define INCLUDE_hash_sha1_mbedtls_h__
 
 #include "hash.h"
 
@@ -16,4 +16,4 @@ struct git_hash_ctx {
     mbedtls_sha1_context c;
 };
 
-#endif /* INCLUDE_hash_mbedtld_h__ */
+#endif /* INCLUDE_hash_sha1_mbedtls_h__ */

src/hash/sha1/openssl.c

@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "hash_openssl.h"
+#include "openssl.h"
 
 int git_hash_global_init(void)
 {

src/hash/sha1/openssl.h

@@ -5,8 +5,8 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#ifndef INCLUDE_hash_hash_openssl_h__
-#define INCLUDE_hash_hash_openssl_h__
+#ifndef INCLUDE_hash_sha1_openssl_h__
+#define INCLUDE_hash_sha1_openssl_h__
 
 #include "common.h"
 

src/hash/sha1/win32.c

@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "hash_win32.h"
+#include "win32.h"
 
 #include "global.h"