[PATCH v2 5/7] common: avb_verify: add str_avb_io_error/str_avb_slot_error

[Igor Opaniuk <igor.opaniuk@foundries.io>]

From: Igor Opaniuk <igor.opaniuk@gmail.com>

Introduce str_avb_io_error() and str_avb_slot_error() functions,
that provide a pointer to AVB runtime error message.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
---

Changes in v2:
- Mattijs Korpershoek R-b tag applied

 common/avb_verify.c  | 49 ++++++++++++++++++++++++++++++++++++++++++++
 include/avb_verify.h |  3 ++-
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/common/avb_verify.c b/common/avb_verify.c
index ed58239cf8a..cff9117d92f 100644
--- a/common/avb_verify.c
+++ b/common/avb_verify.c
@@ -119,6 +119,55 @@ static const unsigned char avb_root_pub[1032] = {
 	0xd8, 0x7e,
 };
 
+const char *str_avb_io_error(AvbIOResult res)
+{
+	switch (res) {
+	case AVB_IO_RESULT_OK:
+		return "Requested operation was successful";
+	case AVB_IO_RESULT_ERROR_IO:
+		return "Underlying hardware encountered an I/O error";
+	case AVB_IO_RESULT_ERROR_OOM:
+		return "Unable to allocate memory";
+	case AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION:
+		return "Requested partition does not exist";
+	case AVB_IO_RESULT_ERROR_RANGE_OUTSIDE_PARTITION:
+		return "Bytes requested is outside the range of partition";
+	case AVB_IO_RESULT_ERROR_NO_SUCH_VALUE:
+		return "Named persistent value does not exist";
+	case AVB_IO_RESULT_ERROR_INVALID_VALUE_SIZE:
+		return "Named persistent value size is not supported";
+	case AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE:
+		return "Buffer is too small for the requested operation";
+	default:
+		return "Unknown AVB error";
+	}
+}
+
+const char *str_avb_slot_error(AvbSlotVerifyResult res)
+{
+	switch (res) {
+	case AVB_SLOT_VERIFY_RESULT_OK:
+		return "Verification passed successfully";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_OOM:
+		return "Allocation of memory failed";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_IO:
+		return "I/O error occurred while trying to load data";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION:
+		return "Digest didn't match or signature checks failed";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_ROLLBACK_INDEX:
+		return "Rollback index is less than its stored value";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_PUBLIC_KEY_REJECTED:
+		return "Public keys are not accepted";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_METADATA:
+		return "Metadata is invalid or inconsistent";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_UNSUPPORTED_VERSION:
+		return "Metadata requires a newer version of libavb";
+	case AVB_SLOT_VERIFY_RESULT_ERROR_INVALID_ARGUMENT:
+		return "Invalid arguments are used";
+	default:
+		return "Unknown AVB slot verification error";
+	}
+}
 /**
  * ============================================================================
  * Boot states support (GREEN, YELLOW, ORANGE, RED) and dm_verity
diff --git a/include/avb_verify.h b/include/avb_verify.h
index 2fb850044d9..5d998b5a302 100644
--- a/include/avb_verify.h
+++ b/include/avb_verify.h
@@ -52,7 +52,8 @@ char *avb_set_enforce_verity(const char *cmdline);
 char *avb_set_ignore_corruption(const char *cmdline);
 
 char *append_cmd_line(char *cmdline_orig, char *cmdline_new);
-
+const char *str_avb_io_error(AvbIOResult res);
+const char *str_avb_slot_error(AvbSlotVerifyResult res);
 /**
  * ============================================================================
  * I/O helper inline functions
-- 
2.34.1