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/*
*
* 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 */;
}
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)) {
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'. Reading data as if it were uncompressed.",
reader->buffer_in->data.raw.compression);
reader->buffer_out = reader->buffer_in;
} 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;
}
}
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;
}
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