| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include <grpc/byte_buffer_reader.h> |
| #include <string.h> |
| |
| #include <grpc/byte_buffer.h> |
| #include <grpc/compression.h> |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/slice_buffer.h> |
| |
| #include "src/core/lib/compression/message_compress.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) { |
| gpr_slice_buffer decompressed_slices_buffer; |
| reader->buffer_in = buffer; |
| switch (reader->buffer_in->type) { |
| case GRPC_BB_RAW: |
| gpr_slice_buffer_init(&decompressed_slices_buffer); |
| if (is_compressed(reader->buffer_in)) { |
| if (grpc_msg_decompress(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); |
| } |
| gpr_slice_buffer_destroy(&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, |
| gpr_slice *slice) { |
| switch (reader->buffer_in->type) { |
| case GRPC_BB_RAW: { |
| gpr_slice_buffer *slice_buffer; |
| slice_buffer = &reader->buffer_out->data.raw.slice_buffer; |
| if (reader->current.index < slice_buffer->count) { |
| *slice = gpr_slice_ref(slice_buffer->slices[reader->current.index]); |
| reader->current.index += 1; |
| return 1; |
| } |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| gpr_slice grpc_byte_buffer_reader_readall(grpc_byte_buffer_reader *reader) { |
| gpr_slice in_slice; |
| size_t bytes_read = 0; |
| const size_t input_size = grpc_byte_buffer_length(reader->buffer_out); |
| gpr_slice out_slice = gpr_slice_malloc(input_size); |
| uint8_t *const outbuf = GPR_SLICE_START_PTR(out_slice); /* just an alias */ |
| |
| while (grpc_byte_buffer_reader_next(reader, &in_slice) != 0) { |
| const size_t slice_length = GPR_SLICE_LENGTH(in_slice); |
| memcpy(&(outbuf[bytes_read]), GPR_SLICE_START_PTR(in_slice), slice_length); |
| bytes_read += slice_length; |
| gpr_slice_unref(in_slice); |
| GPR_ASSERT(bytes_read <= input_size); |
| } |
| return out_slice; |
| } |