Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/channels/gfxredir/common/gfxredir_common.c

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+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ * RDPXXXX Remote App Graphics Redirection Virtual Channel Extension
+ *
+ * Copyright 2020 Microsoft
+ *
+ * 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 <freerdp/config.h>
+
+#include <winpr/crt.h>
+#include <winpr/assert.h>
+#include <winpr/stream.h>
+#include <freerdp/channels/log.h>
+
+#define TAG CHANNELS_TAG("gfxredir.common")
+
+#include "gfxredir_common.h"
+
+/**
+ * Function description
+ *
+ * @return 0 on success, otherwise a Win32 error code
+ */
+UINT gfxredir_read_header(wStream* s, GFXREDIR_HEADER* header)
+{
+	WINPR_ASSERT(header);
+	if (!Stream_CheckAndLogRequiredLength(TAG, s, 8))
+		return ERROR_INVALID_DATA;
+
+	Stream_Read_UINT32(s, header->cmdId);
+	Stream_Read_UINT32(s, header->length);
+	return CHANNEL_RC_OK;
+}
+
+/**
+ * Function description
+ *
+ * @return 0 on success, otherwise a Win32 error code
+ */
+UINT gfxredir_write_header(wStream* s, const GFXREDIR_HEADER* header)
+{
+	WINPR_ASSERT(header);
+	Stream_Write_UINT32(s, header->cmdId);
+	Stream_Write_UINT32(s, header->length);
+	return CHANNEL_RC_OK;
+}