diff options
Diffstat (limited to 'src/core/lib/surface/byte_buffer_reader.c')
-rw-r--r-- | src/core/lib/surface/byte_buffer_reader.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/core/lib/surface/byte_buffer_reader.c b/src/core/lib/surface/byte_buffer_reader.c new file mode 100644 index 0000000000..7248f5fe71 --- /dev/null +++ b/src/core/lib/surface/byte_buffer_reader.c @@ -0,0 +1,123 @@ +/* + * + * Copyright 2015-2016, 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 */; +} + +void 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)) { + grpc_msg_decompress(reader->buffer_in->data.raw.compression, + &reader->buffer_in->data.raw.slice_buffer, + &decompressed_slices_buffer); + 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; + } +} + +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; +} |