[PATCH 1/3] delta read
From: Nicolas Pitre <hidden>
Date: 2016-06-15 22:41:57
This patch makes the core code aware of delta objects and undeltafy them as needed. The convention is to use read_sha1_file() to have undeltafication done automatically (most users do that already so this is transparent). If the delta object itself has to be accessed then it must be done through map_sha1_file() and unpack_sha1_file(). In that context mktag.c has been switched to read_sha1_file() as there is no reason to do the full map+unpack manually. Signed-off-by: Nicolas Pitre <redacted> Index: git/sha1_file.c ===================================================================
--- git.orig/sha1_file.c
+++ git/sha1_file.c@@ -9,6 +9,7 @@ #include <stdarg.h> #include <limits.h> #include "cache.h" +#include "delta.h" #ifndef O_NOATIME #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
@@ -353,6 +354,19 @@ if (map) { buf = unpack_sha1_file(map, mapsize, type, size); munmap(map, mapsize); + if (buf && !strcmp(type, "delta")) { + void *ref = NULL, *delta = buf; + unsigned long ref_size, delta_size = *size; + buf = NULL; + if (delta_size > 20) + ref = read_sha1_file(delta, type, &ref_size); + if (ref) + buf = patch_delta(ref, ref_size, + delta+20, delta_size-20, + size); + free(delta); + free(ref); + } return buf; } return NULL;
Index: git/mktag.c ===================================================================
--- git.orig/mktag.c
+++ git/mktag.c@@ -25,20 +25,14 @@ static int verify_object(unsigned char *sha1, const char *expected_type) { int ret = -1; - unsigned long mapsize; - void *map = map_sha1_file(sha1, &mapsize); + char type[100]; + unsigned long size; + void *buffer = read_sha1_file(sha1, type, &size); - if (map) { - char type[100]; - unsigned long size; - void *buffer = unpack_sha1_file(map, mapsize, type, &size); - - if (buffer) { - if (!strcmp(type, expected_type)) - ret = check_sha1_signature(sha1, buffer, size, type); - free(buffer); - } - munmap(map, mapsize); + if (buffer) { + if (!strcmp(type, expected_type)) + ret = check_sha1_signature(sha1, buffer, size, type); + free(buffer); } return ret; }