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1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ESE_SG_H_
18 #define ESE_SG_H_ 1
19 
20 #include "../../../libese-sysdeps/include/ese/sysdeps.h"
21 
22 #ifdef __cplusplus
23 extern "C" {
24 #endif
25 
26 /* Scatter-Gather Buffer */
27 struct EseSgBuffer {
28   union {
29      uint8_t *base;
30      const uint8_t *c_base;
31   };
32   uint32_t len;
33 };
34 
35 #define ese_sg_set(ese_sg_ptr, buf, len) \
36   (ese_sg_ptr)->base = buf; \
37   (ese_sg_ptr)->len = len
38 
39 /* Computes the total length/size of the buffer on each call. */
40 uint32_t ese_sg_length(const struct EseSgBuffer *bufs, uint32_t cnt);
41 uint32_t ese_sg_to_buf(const struct EseSgBuffer *src, uint32_t src_cnt, uint32_t start_at, uint32_t length, uint8_t *dst);
42 uint32_t ese_sg_from_buf(struct EseSgBuffer *dst, uint32_t dst_cnt, uint32_t start_at, uint32_t length, const uint8_t *src);
43 
44 #ifdef __cplusplus
45 }  /* extern "C" */
46 #endif
47 
48 #endif  /* ESE_SG_H_ */
49