f96466b055
This adds support for filesystem-level sparse files. These files have holes which are not stored in the filesystem and when read are full of zeros. While these zeros may be significant in some types of files, other types of files may not care about the contents of holes. For example, most filesystem creation tools write to all the blocks they care about. Those blocks not written to will remain holes, and can be safely represented by "don't care" chunks. Using "don't care" chunks instead of fill chunks can result in a substantial reduction of the time it takes to program a sparse image. To accomplish this, we extend the existing "sparse" boolean parameter to be an enum of mode types. This enum represents the strategy we take when reading in a file. For the most part the implementation is straightforward. We use lseek to determine where the holes in the file are, and then use do_sparse_file_read_normal to create chunks for the data section. Note that every file has an implicit hole at its end. Change-Id: I0cfbf08886fca9a91cb753ec8734c84fcbe52c9f
112 lines
2.4 KiB
C++
112 lines
2.4 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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#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/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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#if defined(__APPLE__) && defined(__MACH__)
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#define lseek64 lseek
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#define off64_t off_t
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#endif
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void usage() {
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fprintf(stderr, "Usage: img2simg <raw_image_file> <sparse_image_file> [<block_size>]\n");
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}
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int main(int argc, char* argv[]) {
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int in;
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int out;
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int ret;
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struct sparse_file* s;
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unsigned int block_size = 4096;
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off64_t len;
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if (argc < 3 || argc > 4) {
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usage();
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exit(-1);
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}
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if (argc == 4) {
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block_size = atoi(argv[3]);
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}
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if (block_size < 1024 || block_size % 4 != 0) {
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usage();
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exit(-1);
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}
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if (strcmp(argv[1], "-") == 0) {
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in = STDIN_FILENO;
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} else {
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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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}
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if (strcmp(argv[2], "-") == 0) {
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out = STDOUT_FILENO;
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} else {
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out = open(argv[2], 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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}
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len = lseek64(in, 0, SEEK_END);
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lseek64(in, 0, SEEK_SET);
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s = sparse_file_new(block_size, len);
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if (!s) {
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fprintf(stderr, "Failed to create sparse file\n");
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exit(-1);
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}
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sparse_file_verbose(s);
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ret = sparse_file_read(s, in, SPARSE_READ_MODE_NORMAL, false);
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if (ret) {
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fprintf(stderr, "Failed to read file\n");
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exit(-1);
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}
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ret = sparse_file_write(s, 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(in);
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close(out);
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exit(0);
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}
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