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_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H 20 #define GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H 21 22 #include <grpc/support/port_platform.h> 23 24 #include <stddef.h> 25 #include <stdint.h> 26 27 #include <grpc/slice.h> 28 29 struct grpc_base64_decode_context { 30 // input/output: 31 const uint8_t* input_cur; 32 const uint8_t* input_end; 33 uint8_t* output_cur; 34 uint8_t* output_end; 35 // Indicate if the decoder should handle the tail of input data 36 bool contains_tail; 37 }; 38 39 // base64 decode a grpc_base64_decode_context util either input_end is reached 40 // or output_end is reached. When input_end is reached, (input_end - input_cur) 41 // is less than 4. When output_end is reached, (output_end - output_cur) is less 42 // than 3. Returns false if decoding is failed. 43 bool grpc_base64_decode_partial(struct grpc_base64_decode_context* ctx); 44 45 // base64 decode a slice with pad chars. Returns a new slice, does not take 46 // ownership of the input. Returns an empty slice if decoding is failed. 47 grpc_slice grpc_chttp2_base64_decode(const grpc_slice& input); 48 49 // base64 decode a slice without pad chars, data length is needed. Returns a new 50 // slice, does not take ownership of the input. Returns an empty slice if 51 // decoding is failed. 52 grpc_slice grpc_chttp2_base64_decode_with_length(const grpc_slice& input, 53 size_t output_length); 54 55 // Infer the length of decoded data from encoded data. 56 size_t grpc_chttp2_base64_infer_length_after_decode(const grpc_slice& slice); 57 58 #endif // GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_DECODER_H 59