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/*
*
* 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/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/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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
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(&exec_ctx,
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(&exec_ctx,
&decompressed_slices_buffer);
} else { /* not compressed, use the input buffer as output */
reader->buffer_out = reader->buffer_in;
}
reader->current.index = 0;
break;
}
grpc_exec_ctx_finish(&exec_ctx);
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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
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(&exec_ctx, in_slice);
GPR_ASSERT(bytes_read <= input_size);
}
grpc_exec_ctx_finish(&exec_ctx);
return out_slice;
}
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