This is a trivial operation that doesn't require calling a function over
and over- just do some math and indexing into a character array.
Signed-off-by: Dan McGee
---
lib/libalpm/util.c | 24 ++++++++++++++----------
1 files changed, 14 insertions(+), 10 deletions(-)
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 5056b98..57869d3 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -816,6 +816,8 @@ static int sha2_file(const char *path, unsigned char output[32], int is224)
}
#endif
+static const char *hex_digits = "0123456789abcdef";
+
/** Get the md5 sum of file.
* @param filename name of the file
* @return the checksum on success, NULL on error
@@ -829,8 +831,7 @@ char SYMEXPORT *alpm_compute_md5sum(const char *filename)
ASSERT(filename != NULL, return NULL);
- /* allocate 32 chars plus 1 for null */
- CALLOC(md5sum, 33, sizeof(char), return NULL);
+ MALLOC(md5sum, (size_t)33, return NULL);
/* defined above for OpenSSL, otherwise defined in md5.h */
ret = md5_file(filename, output);
@@ -841,10 +842,12 @@ char SYMEXPORT *alpm_compute_md5sum(const char *filename)
/* Convert the result to something readable */
for (i = 0; i < 16; i++) {
- /* sprintf is acceptable here because we know our output */
- sprintf(md5sum +(i * 2), "%02x", output[i]);
+ int pos = i * 2;
+ /* high 4 bits are first digit, low 4 are second */
+ md5sum[pos] = hex_digits[output[i] >> 4];
+ md5sum[pos + 1] = hex_digits[output[i] & 0x0f];
}
-
+ md5sum[32] = '\0';
return md5sum;
}
@@ -861,8 +864,7 @@ char SYMEXPORT *alpm_compute_sha256sum(const char *filename)
ASSERT(filename != NULL, return NULL);
- /* allocate 64 chars plus 1 for null */
- CALLOC(sha256sum, 65, sizeof(char), return NULL);
+ MALLOC(sha256sum, (size_t)65, return NULL);
/* defined above for OpenSSL, otherwise defined in sha2.h */
ret = sha2_file(filename, output, 0);
@@ -873,10 +875,12 @@ char SYMEXPORT *alpm_compute_sha256sum(const char *filename)
/* Convert the result to something readable */
for (i = 0; i < 32; i++) {
- /* sprintf is acceptable here because we know our output */
- sprintf(sha256sum +(i * 2), "%02x", output[i]);
+ int pos = i * 2;
+ /* high 4 bits are first digit, low 4 are second */
+ sha256sum[pos] = hex_digits[output[i] >> 4];
+ sha256sum[pos + 1] = hex_digits[output[i] & 0x0f];
}
-
+ sha256sum[64] = '\0';
return sha256sum;
}
--
1.7.7