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1 /*
2  *
3  * Copyright 2016 gRPC authors.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 
19 #ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H
20 #define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H
21 
22 #include <grpc/support/port_platform.h>
23 
24 #include <grpc/slice.h>
25 #include <stdbool.h>
26 
27 struct grpc_base64_decode_context {
28   /* input/output: */
29   uint8_t* input_cur;
30   uint8_t* input_end;
31   uint8_t* output_cur;
32   uint8_t* output_end;
33   /* Indicate if the decoder should handle the tail of input data*/
34   bool contains_tail;
35 };
36 
37 /* base64 decode a grpc_base64_decode_context util either input_end is reached
38    or output_end is reached. When input_end is reached, (input_end - input_cur)
39    is less than 4. When output_end is reached, (output_end - output_cur) is less
40    than 3. Returns false if decoding is failed. */
41 bool grpc_base64_decode_partial(struct grpc_base64_decode_context* ctx);
42 
43 /* base64 decode a slice with pad chars. Returns a new slice, does not take
44    ownership of the input. Returns an empty slice if decoding is failed. */
45 grpc_slice grpc_chttp2_base64_decode(grpc_slice input);
46 
47 /* base64 decode a slice without pad chars, data length is needed. Returns a new
48    slice, does not take ownership of the input. Returns an empty slice if
49    decoding is failed. */
50 grpc_slice grpc_chttp2_base64_decode_with_length(grpc_slice input,
51                                                  size_t output_length);
52 
53 /* Infer the length of decoded data from encoded data. */
54 size_t grpc_chttp2_base64_infer_length_after_decode(const grpc_slice& slice);
55 
56 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H */
57