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// 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;
}
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