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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit 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 <fluent-bit/flb_info.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_log.h>
#include <fluent-bit/flb_gzip.h>
#include <fluent-bit/flb_compression.h>
static size_t flb_decompression_context_get_read_buffer_offset(
struct flb_decompression_context *context)
{
uintptr_t input_buffer_offset;
if (context == NULL) {
return 0;
}
input_buffer_offset = (uintptr_t) context->read_buffer;
input_buffer_offset -= (uintptr_t) context->input_buffer;
return input_buffer_offset;
}
static void flb_decompression_context_adjust_buffer(
struct flb_decompression_context *context)
{
uintptr_t input_buffer_offset;
if (context != NULL) {
input_buffer_offset = \
flb_decompression_context_get_read_buffer_offset(context);
if (input_buffer_offset >= (context->input_buffer_size / 2)) {
memmove(context->input_buffer,
context->read_buffer,
context->input_buffer_length);
context->read_buffer = context->input_buffer;
}
}
}
uint8_t *flb_decompression_context_get_append_buffer(
struct flb_decompression_context *context)
{
if (context != NULL) {
flb_decompression_context_adjust_buffer(context);
return &context->read_buffer[context->input_buffer_length];
}
return NULL;
}
size_t flb_decompression_context_get_available_space(
struct flb_decompression_context *context)
{
uintptr_t available_buffer_space;
uintptr_t input_buffer_offset;
if (context == NULL) {
return 0;
}
flb_decompression_context_adjust_buffer(context);
input_buffer_offset = \
flb_decompression_context_get_read_buffer_offset(context);
available_buffer_space = context->input_buffer_size;
available_buffer_space -= input_buffer_offset;
available_buffer_space -= context->input_buffer_length;
return available_buffer_space;
}
int flb_decompression_context_resize_buffer(
struct flb_decompression_context *context, size_t new_size)
{
void *new_buffer_address;
if (new_size > context->input_buffer_length) {
new_buffer_address = flb_realloc(context->input_buffer,
new_size);
if (new_buffer_address == NULL) {
return FLB_DECOMPRESSOR_FAILURE;
}
if (new_buffer_address != context->input_buffer) {
context->read_buffer = (uint8_t *) \
(((uintptr_t) context->read_buffer -
(uintptr_t) context->input_buffer) +
(uintptr_t) new_buffer_address);
context->input_buffer = (uint8_t *) new_buffer_address;
context->input_buffer_size = new_size;
}
}
else if (new_size < context->input_buffer_length) {
return FLB_DECOMPRESSOR_FAILURE;
}
return FLB_DECOMPRESSOR_SUCCESS;
}
void flb_decompression_context_destroy(struct flb_decompression_context *context)
{
if (context != NULL) {
if (context->input_buffer != NULL) {
flb_free(context->input_buffer);
context->input_buffer = NULL;
}
if (context->inner_context != NULL) {
flb_gzip_decompression_context_destroy(context->inner_context);
context->inner_context = NULL;
}
context->read_buffer = NULL;
flb_free(context);
}
}
struct flb_decompression_context *flb_decompression_context_create(int algorithm,
size_t input_buffer_size)
{
struct flb_decompression_context *context;
if (input_buffer_size == 0) {
input_buffer_size = FLB_DECOMPRESSION_BUFFER_SIZE;
}
context =
flb_calloc(1, sizeof(struct flb_decompression_context));
if (context == NULL) {
flb_errno();
flb_error("error allocating decompression context");
return NULL;
}
context->input_buffer =
flb_calloc(input_buffer_size, sizeof(uint8_t));
if (context->input_buffer == NULL) {
flb_errno();
flb_error("error allocating decompression buffer");
flb_decompression_context_destroy(context);
return NULL;
}
if (algorithm == FLB_COMPRESSION_ALGORITHM_GZIP) {
context->inner_context = flb_gzip_decompression_context_create();
}
else {
flb_error("invalid compression algorithm : %d", algorithm);
flb_decompression_context_destroy(context);
return NULL;
}
if (context->inner_context == NULL) {
flb_errno();
flb_error("error allocating internal decompression context");
flb_decompression_context_destroy(context);
return NULL;
}
context->input_buffer_size = input_buffer_size;
context->read_buffer = context->read_buffer;
context->algorithm = algorithm;
context->state = FLB_DECOMPRESSOR_STATE_EXPECTING_HEADER;
return context;
}
int flb_decompress(struct flb_decompression_context *context,
void *output_buffer,
size_t *output_length)
{
if (context != NULL) {
if (context->algorithm == FLB_COMPRESSION_ALGORITHM_GZIP) {
return flb_gzip_decompressor_dispatch(context,
output_buffer,
output_length);
}
}
return FLB_DECOMPRESSOR_FAILURE;
}
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