| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * 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 <grpc/support/port_platform.h> |
| |
| #include <grpc/byte_buffer_reader.h> |
| #include <string.h> |
| |
| #include <grpc/byte_buffer.h> |
| #include <grpc/compression.h> |
| #include <grpc/grpc.h> |
| #include <grpc/slice_buffer.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/lib/compression/message_compress.h" |
| #include "src/core/lib/iomgr/exec_ctx.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| |
| static int is_compressed(grpc_byte_buffer* buffer) { |
| switch (buffer->type) { |
| case GRPC_BB_RAW: |
| if (buffer->data.raw.compression == GRPC_COMPRESS_NONE) { |
| return 0 /* GPR_FALSE */; |
| } |
| break; |
| } |
| return 1 /* GPR_TRUE */; |
| } |
| |
| int grpc_byte_buffer_reader_init(grpc_byte_buffer_reader* reader, |
| grpc_byte_buffer* buffer) { |
| grpc_core::ExecCtx exec_ctx; |
| grpc_slice_buffer decompressed_slices_buffer; |
| reader->buffer_in = buffer; |
| switch (reader->buffer_in->type) { |
| case GRPC_BB_RAW: |
| grpc_slice_buffer_init(&decompressed_slices_buffer); |
| if (is_compressed(reader->buffer_in)) { |
| if (grpc_msg_decompress( |
| |
| grpc_compression_algorithm_to_message_compression_algorithm( |
| reader->buffer_in->data.raw.compression), |
| &reader->buffer_in->data.raw.slice_buffer, |
| &decompressed_slices_buffer) == 0) { |
| gpr_log(GPR_ERROR, |
| "Unexpected error decompressing data for algorithm with enum " |
| "value '%d'.", |
| reader->buffer_in->data.raw.compression); |
| memset(reader, 0, sizeof(*reader)); |
| return 0; |
| } else { /* all fine */ |
| reader->buffer_out = |
| grpc_raw_byte_buffer_create(decompressed_slices_buffer.slices, |
| decompressed_slices_buffer.count); |
| } |
| grpc_slice_buffer_destroy_internal(&decompressed_slices_buffer); |
| } else { /* not compressed, use the input buffer as output */ |
| reader->buffer_out = reader->buffer_in; |
| } |
| reader->current.index = 0; |
| break; |
| } |
| |
| return 1; |
| } |
| |
| void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader* reader) { |
| switch (reader->buffer_in->type) { |
| case GRPC_BB_RAW: |
| /* keeping the same if-else structure as in the init function */ |
| if (is_compressed(reader->buffer_in)) { |
| grpc_byte_buffer_destroy(reader->buffer_out); |
| } |
| break; |
| } |
| } |
| |
| int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader* reader, |
| grpc_slice* slice) { |
| switch (reader->buffer_in->type) { |
| case GRPC_BB_RAW: { |
| grpc_slice_buffer* slice_buffer; |
| slice_buffer = &reader->buffer_out->data.raw.slice_buffer; |
| if (reader->current.index < slice_buffer->count) { |
| *slice = grpc_slice_ref_internal( |
| slice_buffer->slices[reader->current.index]); |
| reader->current.index += 1; |
| return 1; |
| } |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| grpc_slice grpc_byte_buffer_reader_readall(grpc_byte_buffer_reader* reader) { |
| grpc_slice in_slice; |
| size_t bytes_read = 0; |
| const size_t input_size = grpc_byte_buffer_length(reader->buffer_out); |
| grpc_slice out_slice = GRPC_SLICE_MALLOC(input_size); |
| uint8_t* const outbuf = GRPC_SLICE_START_PTR(out_slice); /* just an alias */ |
| |
| grpc_core::ExecCtx exec_ctx; |
| while (grpc_byte_buffer_reader_next(reader, &in_slice) != 0) { |
| const size_t slice_length = GRPC_SLICE_LENGTH(in_slice); |
| memcpy(&(outbuf[bytes_read]), GRPC_SLICE_START_PTR(in_slice), slice_length); |
| bytes_read += slice_length; |
| grpc_slice_unref_internal(in_slice); |
| GPR_ASSERT(bytes_read <= input_size); |
| } |
| |
| return out_slice; |
| } |