X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=commit.c;h=b4e000e9c2cdc726271bdc3ced9c2534848d18de;hb=ea88ee46de82bf1e398d0cfef05e3dcdf48b1b88;hp=b45118a544276797f6bc9c0f482c187647f0e88d;hpb=13019d413647c4fbd3bb1564bbdf0d934c0a74d7;p=git.git

diff --git a/commit.c b/commit.c
index b45118a5..b4e000e9 100644
--- a/commit.c
+++ b/commit.c
@@ -1,10 +1,30 @@
+#include "tag.h"
 #include "commit.h"
 #include "cache.h"
-#include <string.h>
-#include <limits.h>
 
 const char *commit_type = "commit";
 
+static struct commit *check_commit(struct object *obj, unsigned char *sha1)
+{
+	if (obj->type != commit_type) {
+		error("Object %s is a %s, not a commit", 
+		      sha1_to_hex(sha1), obj->type);
+		return NULL;
+	}
+	return (struct commit *) obj;
+}
+
+struct commit *lookup_commit_reference(unsigned char *sha1)
+{
+	struct object *obj = parse_object(sha1);
+
+	if (!obj)
+		return NULL;
+	if (obj->type == tag_type)
+		obj = ((struct tag *)obj)->tagged;
+	return check_commit(obj, sha1);
+}
+
 struct commit *lookup_commit(unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
@@ -15,12 +35,9 @@ struct commit *lookup_commit(unsigned char *sha1)
 		ret->object.type = commit_type;
 		return ret;
 	}
-	if (obj->type != commit_type) {
-		error("Object %s is a %s, not a commit", 
-		      sha1_to_hex(sha1), obj->type);
-		return NULL;
-	}
-	return (struct commit *) obj;
+	if (!obj->type)
+		obj->type = commit_type;
+	return check_commit(obj, sha1);
 }
 
 static unsigned long parse_commit_date(const char *buf)
@@ -41,24 +58,14 @@ static unsigned long parse_commit_date(const char *buf)
 	return date;
 }
 
-int parse_commit(struct commit *item)
+int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
 {
-	char type[20];
-	void * buffer, *bufptr;
-	unsigned long size;
+	void *bufptr = buffer;
 	unsigned char parent[20];
+
 	if (item->object.parsed)
 		return 0;
 	item->object.parsed = 1;
-	buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
-	if (!buffer)
-		return error("Could not read %s",
-			     sha1_to_hex(item->object.sha1));
-	if (strcmp(type, commit_type)) {
-		free(buffer);
-		return error("Object %s not a commit",
-			     sha1_to_hex(item->object.sha1));
-	}
 	get_sha1_hex(bufptr + 5, parent);
 	item->tree = lookup_tree(parent);
 	if (item->tree)
@@ -74,10 +81,32 @@ int parse_commit(struct commit *item)
 		bufptr += 48;
 	}
 	item->date = parse_commit_date(bufptr);
-	free(buffer);
 	return 0;
 }
 
+int parse_commit(struct commit *item)
+{
+	char type[20];
+	void *buffer;
+	unsigned long size;
+	int ret;
+
+	if (item->object.parsed)
+		return 0;
+	buffer = read_sha1_file(item->object.sha1, type, &size);
+	if (!buffer)
+		return error("Could not read %s",
+			     sha1_to_hex(item->object.sha1));
+	if (strcmp(type, commit_type)) {
+		free(buffer);
+		return error("Object %s not a commit",
+			     sha1_to_hex(item->object.sha1));
+	}
+	ret = parse_commit_buffer(item, buffer, size);
+	free(buffer);
+	return ret;
+}
+
 void commit_list_insert(struct commit *item, struct commit_list **list_p)
 {
 	struct commit_list *new_list = xmalloc(sizeof(struct commit_list));