diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/hash_fd.c | 72 |
1 files changed, 43 insertions, 29 deletions
diff --git a/libbb/hash_fd.c b/libbb/hash_fd.c index ad0e4f446..770ba09c4 100644 --- a/libbb/hash_fd.c +++ b/libbb/hash_fd.c @@ -166,10 +166,11 @@ static void sha1_begin(sha1_ctx_t *ctx) /* SHA1 hash data in an array of bytes into hash buffer and call the */ /* hash_compile function as required. */ -static void sha1_hash(const unsigned char data[], unsigned int len, sha1_ctx_t *ctx) +static void sha1_hash(const void *data, size_t len, void *ctx_v) { - uint32_t pos = (uint32_t) (ctx->count[0] & SHA1_MASK), - freeb = SHA1_BLOCK_SIZE - pos; + sha1_ctx_t *ctx = (sha1_ctx_t *) ctx_v; + uint32_t pos = (uint32_t) (ctx->count[0] & SHA1_MASK); + uint32_t freeb = SHA1_BLOCK_SIZE - pos; const unsigned char *sp = data; if ((ctx->count[0] += len) < len) @@ -706,6 +707,15 @@ static void md5_hash_bytes(const void *buffer, size_t len, md5_ctx_t *ctx) } } +static void md5_hash(const void *buffer, size_t length, void *md5_ctx) +{ + if (length % 64 == 0) { + md5_hash_block(buffer, length, md5_ctx); + } else { + md5_hash_bytes(buffer, length, md5_ctx); + } +} + /* Process the remaining bytes in the buffer and put result from CTX * in first 16 bytes following RESBUF. The result is always in little * endian byte order, so that a byte-wise output yields to the wanted @@ -760,13 +770,17 @@ static void *md5_end(void *resbuf, md5_ctx_t *ctx) -extern int hash_fd(int src_fd, const off_t size, const uint8_t hash_algo, +extern int hash_fd(int src_fd, const size_t size, const uint8_t hash_algo, uint8_t * hashval) { int result = EXIT_SUCCESS; - off_t hashed_count = 0; - unsigned int blocksize = 0; +// size_t hashed_count = 0; + size_t blocksize = 0; + size_t remaining = size; unsigned char *buffer = NULL; + void (*hash_fn_ptr)(const void *, size_t, void *) = NULL; + void *cx = NULL; + #ifdef CONFIG_SHA1SUM sha1_ctx_t sha1_cx; #endif @@ -779,13 +793,17 @@ extern int hash_fd(int src_fd, const off_t size, const uint8_t hash_algo, if (hash_algo == HASH_SHA1) { /* Ensure that BLOCKSIZE is a multiple of 64. */ blocksize = 65536; - buffer = malloc(blocksize); + buffer = xmalloc(blocksize); + hash_fn_ptr = sha1_hash; + cx = &sha1_cx; } #endif #ifdef CONFIG_MD5SUM if (hash_algo == HASH_MD5) { blocksize = 4096; - buffer = malloc(blocksize + 72); + buffer = xmalloc(blocksize + 72); + hash_fn_ptr = md5_hash; + cx = &md5_cx; } #endif @@ -801,33 +819,29 @@ extern int hash_fd(int src_fd, const off_t size, const uint8_t hash_algo, } #endif /* Iterate over full file contents. */ - do { - const ssize_t count = bb_full_read(src_fd, buffer, blocksize); - - if (count < 1) { + while ((remaining == (size_t) -1) || (remaining > 0)) { + size_t read_try; + ssize_t read_got; + + if (remaining > blocksize) { + read_try = blocksize; + } else { + read_try = remaining; + } + read_got = bb_full_read(src_fd, buffer, read_try); + if (read_got < 1) { /* count == 0 means short read * count == -1 means read error */ - result = count - 1; + result = read_got - 1; break; } - hashed_count += count; + if (remaining != (size_t) -1) { + remaining -= read_got; + } /* Process buffer */ -#ifdef CONFIG_SHA1SUM - if (hash_algo == HASH_SHA1) { - sha1_hash(buffer, count, &sha1_cx); - } -#endif -#ifdef CONFIG_MD5SUM - if (hash_algo == HASH_MD5) { - if (count % 64 == 0) { - md5_hash_block(buffer, count, &md5_cx); - } else { - md5_hash_bytes(buffer, count, &md5_cx); - } - } -#endif - } while ((size == (off_t) - 1) || (hashed_count < size)); + hash_fn_ptr(buffer, read_got, cx); + } /* Finalize and write the hash into our buffer. */ #ifdef CONFIG_SHA1SUM |