add error codes & messages to the library

1 files changed, 66 insertions, 0 deletions

diff --git a/src/error.c b/src/error.c
new file mode 100644
index 0000000..c4af82c
--- /dev/null
+++ b/src/error.c
@@ -0,0 +1,66 @@
+/**
+ * \file
+ * \author Egor Tensin <Egor.Tensin@gmail.com>
+ * \date 2015
+ * \copyright This file is licensed under the terms of the MIT License.
+ *            See LICENSE.txt for details.
+ */
+
+#include <aesni/all.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+static const char* err_msgs[] =
+{
+    "Success",
+    "Invalid argument value NULL",
+    "Invalid PKCS7 padding (wrong key?)",
+};
+
+const char* aesni_strerror(AesNI_ErrorCode ec)
+{
+    return err_msgs[ec];
+}
+
+static void aesni_make_error(
+    AesNI_ErrorDetails* err_details,
+    AesNI_ErrorCode ec)
+{
+    if (err_details == NULL)
+        return;
+
+    err_details->ec = ec;
+}
+
+void aesni_make_error_success(
+    AesNI_ErrorDetails* err_details)
+{
+    if (err_details == NULL)
+        return;
+
+    aesni_make_error(err_details, AESNI_ERROR_SUCCESS);
+}
+
+void aesni_make_error_null_argument(
+    AesNI_ErrorDetails* err_details,
+    const char* arg_name)
+{
+    if (err_details == NULL)
+        return;
+
+    aesni_make_error(err_details, AESNI_ERROR_NULL_ARGUMENT);
+
+    const size_t arg_name_size = sizeof(err_details->params.null_arg.arg_name);
+    strncpy(err_details->params.null_arg.arg_name, arg_name, arg_name_size);
+    err_details->params.null_arg.arg_name[arg_name_size - 1] = '\0';
+}
+
+void aesni_make_error_invalid_pkcs7_padding(
+    AesNI_ErrorDetails* err_details)
+{
+    if (err_details == NULL)
+        return;
+
+    aesni_make_error(err_details, AESNI_ERROR_INVALID_PKCS7_PADDING);
+}