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