Use fixed-size integers for .idx file I/O

This attempts to finish what Simon started in the previous commit.

Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-pack-objects.c

@@ -569,7 +569,7 @@ static void write_index_file(void)
 					sha1_to_hex(object_list_sha1), "idx");
 	struct object_entry **list = sorted_by_sha;
 	struct object_entry **last = list + nr_result;
-	unsigned int array[256];
+	uint32_t array[256];
 
 	/*
 	 * Write the first-level table (the list is sorted,
@@ -587,7 +587,7 @@ static void write_index_file(void)
 		array[i] = htonl(next - sorted_by_sha);
 		list = next;
 	}
-	sha1write(f, array, 256 * sizeof(int));
+	sha1write(f, array, 256 * 4);
 
 	/*
 	 * Write the actual SHA1 entries..
@@ -595,7 +595,7 @@ static void write_index_file(void)
 	list = sorted_by_sha;
 	for (i = 0; i < nr_result; i++) {
 		struct object_entry *entry = *list++;
-		unsigned int offset = htonl(entry->offset);
+		uint32_t offset = htonl(entry->offset);
 		sha1write(f, &offset, 4);
 		sha1write(f, entry->sha1, 20);
 	}

cache.h

@@ -351,7 +351,7 @@ struct pack_window {
 extern struct packed_git {
 	struct packed_git *next;
 	struct pack_window *windows;
-	unsigned int *index_base;
+	uint32_t *index_base;
 	off_t index_size;
 	off_t pack_size;
 	int pack_fd;

sha1_file.c

@@ -435,7 +435,7 @@ static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
 				void **idx_map_)
 {
 	void *idx_map;
-	unsigned int *index;
+	uint32_t *index;
 	unsigned long idx_size;
 	int nr, i;
 	int fd = open(path, O_RDONLY);
@@ -1351,7 +1351,7 @@ int nth_packed_object_sha1(const struct packed_git *p, int n,
 unsigned long find_pack_entry_one(const unsigned char *sha1,
 				  struct packed_git *p)
 {
-	unsigned int *level1_ofs = p->index_base;
+	uint32_t *level1_ofs = p->index_base;
 	int hi = ntohl(level1_ofs[*sha1]);
 	int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
 	void *index = p->index_base + 256;
@@ -1360,7 +1360,7 @@ unsigned long find_pack_entry_one(const unsigned char *sha1,
 		int mi = (lo + hi) / 2;
 		int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
 		if (!cmp)
-			return ntohl(*((unsigned int *) ((char *) index + (24 * mi))));
+			return ntohl(*((uint32_t *)((char *)index + (24 * mi))));
 		if (cmp > 0)
 			hi = mi;
 		else