1 files changed, 61 insertions, 0 deletions
diff --git a/libhashsum_init_hasher_from_string.c b/libhashsum_init_hasher_from_string.c
new file mode 100644
index 0000000..e41c8b1
--- /dev/null
+++ b/libhashsum_init_hasher_from_string.c
@@ -0,0 +1,61 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+#if defined(__GNUC__)
+__attribute__((__pure__))
+#endif
+static int
+equiv(const char *a, const char *b)
+{
+	while (*a && *b) {
+		if (tolower(*a) == tolower(*b)) {
+			a++;
+			b++;
+		} else if (*b == '-') {
+			b++;
+		} else {
+			return 0;
+		}
+	}
+	return !*a && !*b;
+}
+
+
+int
+libhashsum_init_hasher_from_string(struct libhashsum_hasher *this, const char *algorithm)
+{
+	if (!strcasecmp(algorithm, "MD2"))
+		return libhashsum_init_md2_hasher(this);
+	if (!strcasecmp(algorithm, "MD4"))
+		return libhashsum_init_md4_hasher(this);
+	if (!strcasecmp(algorithm, "MD5"))
+		return libhashsum_init_md5_hasher(this);
+	if (equiv(algorithm, "RIPEMD-128"))
+		return libhashsum_init_ripemd_128_hasher(this);
+	if (equiv(algorithm, "RIPEMD-160"))
+		return libhashsum_init_ripemd_160_hasher(this);
+	if (equiv(algorithm, "RIPEMD-256"))
+		return libhashsum_init_ripemd_256_hasher(this);
+	if (equiv(algorithm, "RIPEMD-320"))
+		return libhashsum_init_ripemd_320_hasher(this);
+	if (equiv(algorithm, "SHA-0"))
+		return libhashsum_init_sha0_hasher(this);
+	if (equiv(algorithm, "SHA-1"))
+		return libhashsum_init_sha1_hasher(this);
+	if (equiv(algorithm, "SHA-224") || !strcasecmp(algorithm, "SHA2-224"))
+		return libhashsum_init_sha_224_hasher(this);
+	if (equiv(algorithm, "SHA-256") || !strcasecmp(algorithm, "SHA2-256"))
+		return libhashsum_init_sha_256_hasher(this);
+	if (equiv(algorithm, "SHA-384") || !strcasecmp(algorithm, "SHA2-384"))
+		return libhashsum_init_sha_384_hasher(this);
+	if (equiv(algorithm, "SHA-512") || !strcasecmp(algorithm, "SHA2-512"))
+		return libhashsum_init_sha_512_hasher(this);
+	if (equiv(algorithm, "SHA-512/224") || !strcasecmp(algorithm, "SHA2-512/224"))
+		return libhashsum_init_sha_512_224_hasher(this);
+	if (equiv(algorithm, "SHA-512/256") || !strcasecmp(algorithm, "SHA2-512/256"))
+		return libhashsum_init_sha_512_256_hasher(this);
+
+	errno = EINVAL;
+	return -1;
+}