bdc6d39ed6
Add sparse_file_repsarse, which splits chunks in an existing sparse file such that the maximum size of a chunk, plus a header and footer, is smaller than the given size. This will allow multiple smaller sparse files to result in the same data as a large sparse file. Change-Id: I177abdb958a23d5afd394ff265c5b0c6a3ff22fa
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define _FILE_OFFSET_BITS 64
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#define _LARGEFILE64_SOURCE 1
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sparse/sparse.h>
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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void usage()
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{
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fprintf(stderr, "Usage: simg2simg <sparse image file> <sparse_image_file> <max_size>\n");
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}
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int main(int argc, char *argv[])
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{
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int in;
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int out;
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int i;
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int ret;
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struct sparse_file *s;
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int64_t max_size;
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struct sparse_file **out_s;
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int files;
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char filename[4096];
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if (argc != 4) {
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usage();
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exit(-1);
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}
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max_size = atoll(argv[3]);
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in = open(argv[1], O_RDONLY | O_BINARY);
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if (in < 0) {
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fprintf(stderr, "Cannot open input file %s\n", argv[1]);
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exit(-1);
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}
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s = sparse_file_import(in, true, false);
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if (!s) {
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fprintf(stderr, "Failed to import sparse file\n");
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exit(-1);
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}
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files = sparse_file_resparse(s, max_size, NULL, 0);
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if (files < 0) {
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fprintf(stderr, "Failed to resparse\n");
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exit(-1);
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}
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out_s = calloc(sizeof(struct sparse_file *), files);
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if (!out_s) {
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fprintf(stderr, "Failed to allocate sparse file array\n");
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exit(-1);
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}
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files = sparse_file_resparse(s, max_size, out_s, files);
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if (files < 0) {
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fprintf(stderr, "Failed to resparse\n");
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exit(-1);
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}
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for (i = 0; i < files; i++) {
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ret = snprintf(filename, sizeof(filename), "%s.%d", argv[2], i);
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if (ret >= (int)sizeof(filename)) {
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fprintf(stderr, "Filename too long\n");
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exit(-1);
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}
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out = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
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if (out < 0) {
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fprintf(stderr, "Cannot open output file %s\n", argv[2]);
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exit(-1);
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}
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ret = sparse_file_write(out_s[i], out, false, true, false);
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if (ret) {
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fprintf(stderr, "Failed to write sparse file\n");
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exit(-1);
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}
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close(out);
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}
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close(in);
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exit(0);
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}
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