Clean up git-unpack-objects a bit

I'd like to add back the "dry-run" thing, but it turns out that to do it
well, I'd have to keep all the object data in memory (which is not
acceptable).  So I'll clean it up a bit and make it do as many checks as
it can.

diff --git a/unpack-objects.c b/unpack-objects.c
index b9ddcb7..0d15c00 100644 (file)
--- a/unpack-objects.c
+++ b/unpack-objects.c
@@ -98,15 +98,22 @@ static void add_delta_to_list(unsigned char *base_sha1, void *delta, unsigned lo
        delta_list = info;
 }
 
-static void added_object(unsigned char *sha1, char *type, void *data, unsigned long size);
+static void added_object(unsigned char *sha1, const char *type, void *data, unsigned long size);
 
-static int resolve_delta(char *type,
+static void write_object(void *buf, unsigned long size, const char *type)
+{
+       unsigned char sha1[20];
+       if (write_sha1_file(buf, size, type, sha1) < 0)
+               die("failed to write object");
+       added_object(sha1, type, buf, size);
+}
+
+static int resolve_delta(const char *type,
        void *base, unsigned long base_size, 
        void *delta, unsigned long delta_size)
 {
        void *result;
        unsigned long result_size;
-       unsigned char sha1[20];
 
        result = patch_delta(base, base_size,
                             delta, delta_size,
@@ -114,15 +121,12 @@ static int resolve_delta(char *type,
        if (!result)
                die("failed to apply delta");
        free(delta);
-
-       if (write_sha1_file(result, result_size, type, sha1) < 0)
-               die("failed to write object");
-       added_object(sha1, type, result, result_size);
+       write_object(result, result_size, type);
        free(result);
        return 0;
 }
 
-static void added_object(unsigned char *sha1, char *type, void *data, unsigned long size)
+static void added_object(unsigned char *sha1, const char *type, void *data, unsigned long size)
 {
        struct delta_info **p = &delta_list;
        struct delta_info *info;
@@ -142,8 +146,7 @@ static void added_object(unsigned char *sha1, char *type, void *data, unsigned l
 static int unpack_non_delta_entry(enum object_type kind, unsigned long size)
 {
        void *buf = get_data(size);
-       unsigned char sha1[20];
-       char *type;
+       const char *type;
 
        switch (kind) {
        case OBJ_COMMIT: type = "commit"; break;
@@ -152,9 +155,7 @@ static int unpack_non_delta_entry(enum object_type kind, unsigned long size)
        case OBJ_TAG:    type = "tag"; break;
        default: die("bad type %d", kind);
        }
-       if (write_sha1_file(buf, size, type, sha1) < 0)
-               die("failed to write object");
-       added_object(sha1, type, buf, size);
+       write_object(buf, size, type);
        free(buf);
        return 0;
 }