New commandline args are clearer, and prepare for compression.
BUG=chromium-os:11488
TEST=none
Change-Id: I6ee493037da5746d2db6e840ac6590dd12f37cfe
Review URL: http://codereview.chromium.org/6482001
diff --git a/utility/bmpblk_util.c b/utility/bmpblk_util.c
new file mode 100644
index 0000000..d7b9cbf
--- /dev/null
+++ b/utility/bmpblk_util.c
@@ -0,0 +1,101 @@
+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "bmpblk_util.h"
+
+
+// Returns pointer to buffer containing entire file, sets length.
+static void *read_entire_file(const char *filename, size_t *length) {
+ int fd;
+ struct stat sbuf;
+ void *ptr;
+
+ *length = 0; // just in case
+
+ if (0 != stat(filename, &sbuf)) {
+ fprintf(stderr, "Unable to stat %s: %s\n", filename, strerror(errno));
+ return 0;
+ }
+
+ if (!sbuf.st_size) {
+ fprintf(stderr, "File %s is empty\n", filename);
+ return 0;
+ }
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "Unable to open %s: %s\n", filename, strerror(errno));
+ return 0;
+ }
+
+ ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (MAP_FAILED == ptr) {
+ fprintf(stderr, "Unable to mmap %s: %s\n", filename, strerror(errno));
+ close(fd);
+ return 0;
+ }
+
+ *length = sbuf.st_size;
+
+ close(fd);
+
+ return ptr;
+}
+
+
+// Reclaims buffer from read_entire_file().
+static void discard_file(void *ptr, size_t length) {
+ munmap(ptr, length);
+}
+
+
+// Show what's inside
+int display_bmpblock(const char *infile) {
+ char *ptr;
+ size_t length = 0;
+ BmpBlockHeader *hdr;
+
+ ptr = (char *)read_entire_file(infile, &length);
+ if (!ptr)
+ return 1;
+
+ if (length < sizeof(BmpBlockHeader)) {
+ fprintf(stderr, "File %s is too small to be a BMPBLOCK\n", infile);
+ discard_file(ptr, length);
+ return 1;
+ }
+
+ if (0 != memcmp(ptr, BMPBLOCK_SIGNATURE, BMPBLOCK_SIGNATURE_SIZE)) {
+ fprintf(stderr, "File %s is not a BMPBLOCK\n", infile);
+ discard_file(ptr, length);
+ return 1;
+ }
+
+ hdr = (BmpBlockHeader *)ptr;
+ printf("%s:\n", infile);
+ printf(" version %d.%d\n", hdr->major_version, hdr->minor_version);
+ printf(" %d screens\n", hdr->number_of_screenlayouts);
+ printf(" %d localizations\n", hdr->number_of_localizations);
+ printf(" %d discrete images\n", hdr->number_of_imageinfos);
+
+ discard_file(ptr, length);
+
+ return 0;
+}
+
+int extract_bmpblock(const char *infile, const char *dirname, int force) {
+ printf("extract parts from %s into %s %s overwriting\n",
+ infile, dirname, force ? "with" : "without");
+ printf("NOT YET IMPLEMENTED\n");
+ return 0;
+}