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
diff --git a/libsparse/simg2img.c b/libsparse/simg2img.c
index ab35583..95e9b5b 100644
--- a/libsparse/simg2img.c
+++ b/libsparse/simg2img.c
@@ -26,50 +26,62 @@
#include <sys/types.h>
#include <unistd.h>
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
void usage()
{
- fprintf(stderr, "Usage: simg2img <sparse_image_file> <raw_image_file>\n");
+ fprintf(stderr, "Usage: simg2img <sparse_image_files> <raw_image_file>\n");
}
int main(int argc, char *argv[])
{
int in;
int out;
- unsigned int i;
+ int i;
int ret;
struct sparse_file *s;
- if (argc != 3) {
+ if (argc < 3) {
usage();
exit(-1);
}
- if (strcmp(argv[1], "-") == 0) {
- in = STDIN_FILENO;
- } else {
- if ((in = open(argv[1], O_RDONLY)) == 0) {
- fprintf(stderr, "Cannot open input file %s\n", argv[1]);
- exit(-1);
- }
- }
-
- if (strcmp(argv[2], "-") == 0) {
- out = STDOUT_FILENO;
- } else {
- if ((out = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0666)) == 0) {
- fprintf(stderr, "Cannot open output file %s\n", argv[2]);
- exit(-1);
- }
- }
-
- s = sparse_file_import(in, true, false);
- if (!s) {
- fprintf(stderr, "Failed to read sparse file\n");
+ out = open(argv[argc - 1], O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0664);
+ if (out < 0) {
+ fprintf(stderr, "Cannot open output file %s\n", argv[argc - 1]);
exit(-1);
}
- ret = sparse_file_write(s, out, false, false, false);
- close(in);
+ for (i = 1; i < argc - 1; i++) {
+ if (strcmp(argv[i], "-") == 0) {
+ in = STDIN_FILENO;
+ } else {
+ in = open(argv[i], O_RDONLY | O_BINARY);
+ if (in < 0) {
+ fprintf(stderr, "Cannot open input file %s\n", argv[i]);
+ exit(-1);
+ }
+ }
+
+ s = sparse_file_import(in, true, false);
+ if (!s) {
+ fprintf(stderr, "Failed to read sparse file\n");
+ exit(-1);
+ }
+
+ lseek(out, SEEK_SET, 0);
+
+ ret = sparse_file_write(s, out, false, false, false);
+ if (ret < 0) {
+ fprintf(stderr, "Cannot write output file\n");
+ exit(-1);
+ }
+ sparse_file_destroy(s);
+ close(in);
+ }
+
close(out);
exit(0);