1 files changed, 108 insertions, 0 deletions
diff --git a/src/compat.c b/src/compat.c
new file mode 100644
index 0000000..d0b1be4
--- /dev/null
+++ b/src/compat.c
@@ -0,0 +1,108 @@
+/* compat.c - Various compatibility functions
+ * Copyright 2011, 2012 Gergely Nagy <algernon@balabit.hu>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "config.h"
+
+#if WITH_OPENSSL
+
+#include "compat.h"
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <openssl/md5.h>
+
+struct _GChecksum
+{
+  GChecksumType type;
+  char hex_digest[33];
+
+  MD5_CTX context;
+};
+
+GChecksum *
+g_checksum_new (GChecksumType checksum_type)
+{
+  GChecksum *chk;
+
+  if (checksum_type != G_CHECKSUM_MD5)
+    {
+      errno = ENOSYS;
+      return NULL;
+    }
+
+  chk = calloc (1, sizeof (GChecksum));
+  chk->type = checksum_type;
+
+  MD5_Init (&chk->context);
+
+  return chk;
+}
+
+void
+g_checksum_free (GChecksum *checksum)
+{
+  if (checksum)
+    free (checksum);
+}
+
+void
+g_checksum_update (GChecksum *checksum,
+                   const unsigned char *data,
+                   ssize_t length)
+{
+  size_t l = length;
+
+  if (!checksum || !data || length == 0)
+    {
+      errno = EINVAL;
+      return;
+    }
+  errno = 0;
+
+  if (length < 0)
+    l = strlen ((const char *)data);
+
+  MD5_Update (&checksum->context, (const void *)data, l);
+}
+
+const char *
+g_checksum_get_string (GChecksum *checksum)
+{
+  unsigned char digest[16];
+  static const char hex[16] =
+    {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+     'a', 'b', 'c', 'd', 'e', 'f'};
+  int i;
+
+  if (!checksum)
+    {
+      errno = EINVAL;
+      return NULL;
+    }
+
+  MD5_Final (digest, &checksum->context);
+
+  for (i = 0; i < 16; i++)
+    {
+      checksum->hex_digest[2 * i] = hex[(digest[i] & 0xf0) >> 4];
+      checksum->hex_digest[2 * i + 1] = hex[digest[i] & 0x0f];
+    }
+  checksum->hex_digest[32] = '\0';
+
+  return checksum->hex_digest;
+}
+
+#endif /* WITH_OPENSSL */