[PATCH BlueZ v2 2/3] gatt: Add org.bluez.Error.InvalidOffset for long read procedure

[Grzegorz Kolodziejczyk <grzegorz.kolodziejczyk@codecoup.pl>]

This patch adds handling of invalid offset error for gatt database in
case if offset in read blob would be invalid.

"The Read Blob Request is repeated until the Read Blob Response’s Part
Attribute Value parameter is zero or an Error Response is sent by the server
with the Error Code set to Invalid Offset." Bluetooth Core 5.0, 4.12.2

"If the prepare Value Offset is greater than the current length of the attribute
value then all pending prepare write values shall be discarded for this client,
the queue shall be cleared and then an Error Response shall be sent with the
«Invalid Offset»." Bluetooth Core 5.0, 3.4.6.3
---
 doc/gatt-api.txt    | 1 +
 src/gatt-database.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/doc/gatt-api.txt b/doc/gatt-api.txt
index ccf3a8b6d..3f542b5eb 100644
--- a/doc/gatt-api.txt
+++ b/doc/gatt-api.txt
@@ -74,6 +74,7 @@ Methods		array{byte} ReadValue(dict options)
 					 org.bluez.Error.InProgress
 					 org.bluez.Error.NotPermitted
 					 org.bluez.Error.NotAuthorized
+					 org.bluez.Error.InvalidOffset
 					 org.bluez.Error.NotSupported
 
 		void WriteValue(array{byte} value, dict options)
diff --git a/src/gatt-database.c b/src/gatt-database.c
index 9a33ae7f9..8e09a6a40 100644
--- a/src/gatt-database.c
+++ b/src/gatt-database.c
@@ -1649,6 +1649,9 @@ static uint8_t dbus_error_to_att_ecode(const char *error_name)
 	if (strcmp(error_name, "org.bluez.Error.InvalidValueLength") == 0)
 		return BT_ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LEN;
 
+	if (strcmp(error_name, "org.bluez.Error.InvalidOffset") == 0)
+		return BT_ATT_ERROR_INVALID_OFFSET;
+
 	if (strcmp(error_name, "org.bluez.Error.InProgress") == 0)
 		return BT_ERROR_ALREADY_IN_PROGRESS;
 
-- 
2.13.6