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-rw-r--r--applypatch/applypatch.c78
1 files changed, 72 insertions, 6 deletions
diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c
index 69f8633ab..2f134df05 100644
--- a/applypatch/applypatch.c
+++ b/applypatch/applypatch.c
@@ -421,18 +421,84 @@ int WriteToPartition(unsigned char* data, size_t len,
break;
case EMMC:
- ;
- FILE* f = fopen(partition, "wb");
- if (fwrite(data, 1, len, f) != len) {
- printf("short write writing to %s (%s)\n",
- partition, strerror(errno));
+ {
+ size_t start = 0;
+ int success = 0;
+ FILE* f = fopen(partition, "r+b");
+ if (f == NULL) {
+ printf("failed to open %s: %s\n", partition, strerror(errno));
return -1;
}
+ int attempt;
+
+ for (attempt = 0; attempt < 3; ++attempt) {
+ printf("write %s attempt %d start at %d\n", partition, attempt+1, start);
+ fseek(f, start, SEEK_SET);
+ while (start < len) {
+ size_t to_write = len - start;
+ if (to_write > (1<<20)) to_write = 1<<20;
+
+ if (fwrite(data+start, 1, to_write, f) != to_write) {
+ printf("short write writing to %s (%s)\n",
+ partition, strerror(errno));
+ return -1;
+ }
+ start += to_write;
+ if (start < len) {
+ usleep(50000); // 50 ms
+ }
+ }
+
+ // drop caches so our subsequent verification read
+ // won't just be reading the cache.
+ sync();
+ FILE* dc = fopen("/proc/sys/vm/drop_caches", "w");
+ fwrite("3\n", 2, 1, dc);
+ fclose(dc);
+ sleep(1);
+ printf(" caches dropped\n");
+
+ // verify
+ fseek(f, 0, SEEK_SET);
+ unsigned char buffer[4096];
+ start = len;
+ size_t p;
+ for (p = 0; p < len; p += sizeof(buffer)) {
+ size_t to_read = len - p;
+ if (to_read > sizeof(buffer)) to_read = sizeof(buffer);
+
+ if (fread(buffer, 1, to_read, f) != to_read) {
+ printf("short verify read %s at %d: %s\n",
+ partition, p, strerror(errno));
+ start = p;
+ break;
+ }
+
+ if (memcmp(buffer, data+p, to_read)) {
+ printf("verification failed starting at %d\n", p);
+ start = p;
+ break;
+ }
+ }
+
+ if (start == len) {
+ printf("verification read succeeded (attempt %d)\n", attempt+1);
+ success = true;
+ break;
+ }
+ }
+
+ if (!success) {
+ printf("failed to verify after all attempts\n");
+ return -1;
+ }
+
if (fclose(f) != 0) {
printf("error closing %s (%s)\n", partition, strerror(errno));
return -1;
}
break;
+ }
}
free(copy);
@@ -473,7 +539,7 @@ int ParseSha1(const char* str, uint8_t* digest) {
// Search an array of sha1 strings for one matching the given sha1.
// Return the index of the match on success, or -1 if no match is
// found.
-int FindMatchingPatch(uint8_t* sha1, const char** patch_sha1_str,
+int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
int num_patches) {
int i;
uint8_t patch_sha1[SHA_DIGEST_SIZE];