Hook up the backup data writer, and add a utility to read the backup data files.
diff --git a/cmds/backup/backup.cpp b/cmds/backup/backup.cpp
new file mode 100644
index 0000000..51ac943
--- /dev/null
+++ b/cmds/backup/backup.cpp
@@ -0,0 +1,122 @@
+
+#include <utils/backup_helpers.h>
+#include <utils/String8.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+
+using namespace android;
+
+#include <unistd.h>
+
+int
+usage(int argc, const char** argv)
+{
+ const char* p = argv[0];
+
+ fprintf(stderr, "%s: Backs up your data.\n"
+ "\n"
+ "usage: %s\n"
+ " Prints all of the data that can be backed up to stdout.\n"
+ "\n"
+ "usage: %s list FILE\n"
+ " Lists the backup entities in the file.\n"
+ "\n"
+ "usage: %s print NAME FILE\n"
+ " Prints the entity named NAME in FILE.\n",
+ p, p, p, p);
+ return 1;
+}
+
+int
+perform_full_backup()
+{
+ printf("this would have written all of your data to stdout\n");
+ return 0;
+}
+
+int
+perform_list(const char* filename)
+{
+ int err;
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd == -1) {
+ fprintf(stderr, "Error opening: %s\n", filename);
+ return 1;
+ }
+
+ BackupDataReader reader(fd);
+ int type;
+
+ while (reader.ReadNextHeader(&type) == 0) {
+ switch (type) {
+ case BACKUP_HEADER_APP_V1:
+ {
+ String8 packageName;
+ int cookie;
+ err = reader.ReadAppHeader(&packageName, &cookie);
+ if (err == 0) {
+ printf("App header: %s 0x%08x (%d)\n", packageName.string(), cookie, cookie);
+ } else {
+ printf("Error reading app header\n");
+ }
+ break;
+ }
+ case BACKUP_HEADER_ENTITY_V1:
+ {
+ String8 key;
+ size_t dataSize;
+ err = reader.ReadEntityHeader(&key, &dataSize);
+ if (err == 0) {
+ printf(" entity: %s (%d bytes)\n", key.string(), dataSize);
+ } else {
+ printf(" Error reading entity header\n");
+ }
+ break;
+ }
+ case BACKUP_FOOTER_APP_V1:
+ {
+ int cookie;
+ err = reader.ReadAppFooter(&cookie);
+ if (err == 0) {
+ printf(" App footer: 0x%08x (%d)\n", cookie, cookie);
+ } else {
+ printf(" Error reading entity header\n");
+ }
+ break;
+ }
+ default:
+ {
+ printf("Unknown chunk type: 0x%08x\n", type);
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
+int perform_print(const char* entityname, const char* filename)
+{
+ printf("perform_print(%s, %s);", entityname, filename);
+ return 0;
+}
+
+int
+main(int argc, const char** argv)
+{
+ if (argc <= 1) {
+ return perform_full_backup();
+ }
+ if (argc == 3 && 0 == strcmp(argv[1], "list")) {
+ return perform_list(argv[2]);
+ }
+ if (argc == 4 && 0 == strcmp(argv[1], "print")) {
+ return perform_print(argv[2], argv[3]);
+ }
+ return usage(argc, argv);
+}
+