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/*
*
* Copyright 2017 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/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/compression/stream_compression_identity.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/slice/slice_internal.h"
#define OUTPUT_BLOCK_SIZE (1024)
/* Singleton context used for all identity streams. */
static grpc_stream_compression_context identity_ctx = {
&grpc_stream_compression_identity_vtable};
static void grpc_stream_compression_pass_through(grpc_slice_buffer* in,
grpc_slice_buffer* out,
size_t* output_size,
size_t max_output_size) {
if (max_output_size >= in->length) {
if (output_size) {
*output_size = in->length;
}
grpc_slice_buffer_move_into(in, out);
} else {
if (output_size) {
*output_size = max_output_size;
}
grpc_slice_buffer_move_first(in, max_output_size, out);
}
}
static bool grpc_stream_compress_identity(grpc_stream_compression_context* ctx,
grpc_slice_buffer* in,
grpc_slice_buffer* out,
size_t* output_size,
size_t max_output_size,
grpc_stream_compression_flush flush) {
if (ctx == NULL) {
return false;
}
grpc_stream_compression_pass_through(in, out, output_size, max_output_size);
return true;
}
static bool grpc_stream_decompress_identity(
grpc_stream_compression_context* ctx, grpc_slice_buffer* in,
grpc_slice_buffer* out, size_t* output_size, size_t max_output_size,
bool* end_of_context) {
if (ctx == NULL) {
return false;
}
grpc_stream_compression_pass_through(in, out, output_size, max_output_size);
if (end_of_context) {
*end_of_context = false;
}
return true;
}
static grpc_stream_compression_context*
grpc_stream_compression_context_create_identity(
grpc_stream_compression_method method) {
GPR_ASSERT(method == GRPC_STREAM_COMPRESSION_IDENTITY_COMPRESS ||
method == GRPC_STREAM_COMPRESSION_IDENTITY_DECOMPRESS);
/* No context needed in this case. Use fake context instead. */
return (grpc_stream_compression_context*)&identity_ctx;
}
static void grpc_stream_compression_context_destroy_identity(
grpc_stream_compression_context* ctx) {
return;
}
const grpc_stream_compression_vtable grpc_stream_compression_identity_vtable = {
grpc_stream_compress_identity, grpc_stream_decompress_identity,
grpc_stream_compression_context_create_identity,
grpc_stream_compression_context_destroy_identity};
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