/src/FreeRDP/libfreerdp/codec/rfx_differential.h
Line | Count | Source |
1 | | /** |
2 | | * FreeRDP: A Remote Desktop Protocol Implementation |
3 | | * RemoteFX Codec Library - Differential Encoding |
4 | | * |
5 | | * Copyright 2011 Vic Lee |
6 | | * |
7 | | * Licensed under the Apache License, Version 2.0 (the "License"); |
8 | | * you may not use this file except in compliance with the License. |
9 | | * You may obtain a copy of the License at |
10 | | * |
11 | | * http://www.apache.org/licenses/LICENSE-2.0 |
12 | | * |
13 | | * Unless required by applicable law or agreed to in writing, software |
14 | | * distributed under the License is distributed on an "AS IS" BASIS, |
15 | | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
16 | | * See the License for the specific language governing permissions and |
17 | | * limitations under the License. |
18 | | */ |
19 | | |
20 | | #ifndef FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H |
21 | | #define FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H |
22 | | |
23 | | #include <freerdp/codec/rfx.h> |
24 | | #include <freerdp/api.h> |
25 | | #include "rfx_types.h" |
26 | | |
27 | | WINPR_ATTR_NODISCARD |
28 | | static inline BOOL rfx_differential_decode(INT16* WINPR_RESTRICT buffer, size_t size) |
29 | 0 | { |
30 | 0 | INT16* ptr = buffer; |
31 | 0 | INT16* end = &buffer[size - 1]; |
32 | |
|
33 | 0 | while (ptr != end) |
34 | 0 | { |
35 | 0 | const int tmp = ptr[0] + ptr[1]; |
36 | 0 | if ((tmp > INT16_MAX) || (tmp < INT16_MIN)) |
37 | 0 | { |
38 | 0 | WLog_ERR(RFX_TAG, "differental: %d <= %d <= %d\n", INT16_MIN, tmp, INT16_MAX); |
39 | 0 | return FALSE; |
40 | 0 | } |
41 | 0 | ptr[1] = WINPR_ASSERTING_INT_CAST(INT16, tmp); |
42 | 0 | ptr++; |
43 | 0 | } |
44 | 0 | return TRUE; |
45 | 0 | } Unexecuted instantiation: progressive.c:rfx_differential_decode Unexecuted instantiation: rfx_decode.c:rfx_differential_decode Unexecuted instantiation: rfx_encode.c:rfx_differential_decode |
46 | | |
47 | | static inline void rfx_differential_encode(INT16* WINPR_RESTRICT buffer, size_t size) |
48 | 0 | { |
49 | 0 | INT16 n1 = buffer[0]; |
50 | 0 | for (size_t x = 0; x < size - 1; x++) |
51 | 0 | { |
52 | 0 | INT16* dst = &buffer[x + 1]; |
53 | 0 | const INT16 n2 = *dst; |
54 | 0 | const int tmp = n2 - n1; |
55 | 0 | *dst = WINPR_ASSERTING_INT_CAST(INT16, tmp); |
56 | 0 | n1 = n2; |
57 | 0 | } |
58 | 0 | } Unexecuted instantiation: progressive.c:rfx_differential_encode Unexecuted instantiation: rfx_decode.c:rfx_differential_encode Unexecuted instantiation: rfx_encode.c:rfx_differential_encode |
59 | | |
60 | | #endif /* FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H */ |