diff options
Diffstat (limited to 'applypatch')
| -rw-r--r-- | applypatch/applypatch.c | 78 | ||||
| -rw-r--r-- | applypatch/applypatch.h | 2 |
2 files changed, 73 insertions, 7 deletions
diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c index 69f8633..2f134df 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]; diff --git a/applypatch/applypatch.h b/applypatch/applypatch.h index d1a0232..f1f13a1 100644 --- a/applypatch/applypatch.h +++ b/applypatch/applypatch.h @@ -65,7 +65,7 @@ int LoadFileContents(const char* filename, FileContents* file, int retouch_flag); int SaveFileContents(const char* filename, const FileContents* file); void FreeFileContents(FileContents* file); -int FindMatchingPatch(uint8_t* sha1, const char** patch_sha1_str, +int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str, int num_patches); // bsdiff.c |