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/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/
/**@file tcomp_compressordisp.h
* @brief Entity that receives application messages, invokes a compressor,and forwards the resulting SigComp compressed messages to a remote
* endpoint.
*
* @author Mamadou Diop <diopmamadou(at)yahoo.fr>
*
*/
#include "tcomp_compressordisp.h"
#include "tcomp_compressor_dummy.h"
#include "tcomp_compressor_deflate.h"
#include "tsk_memory.h"
#include "tsk_debug.h"
#include <string.h>
/**Checks whether NACK (RFC 4077) handling is supported
*/
#define TCOMP_NACK_SUPPORTED (dispatcher->stateHandler->sigcomp_parameters->SigComp_version >= 0x02)
/**Creates new compressor dispatcher.
*/
tcomp_compressordisp_t* tcomp_compressordisp_create(const tcomp_statehandler_t* statehandler)
{
return tsk_object_new(tcomp_compressordisp_def_t, statehandler);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
/// Compress a message.
///
/// @param [in,out] dispatcher The compressor dispatcher.
/// @param compartmentId The compartment to use to compress the message.
/// @param [in,out] input_ptr The message to compress.
/// @param input_size The size of the input buffer.
/// @param [in,out] output_ptr The output buffer to copy the compressed data.
/// @param [in,out] output_size The size of the output buffer.
/// @param stream Indicates whether it's a stream buffer or not.
///
/// @return @a tsk_true if succeed and @a tsk_false otherwize.
////////////////////////////////////////////////////////////////////////////////////////////////////
tsk_bool_t tcomp_compressordisp_compress(tcomp_compressordisp_t *dispatcher, uint64_t compartmentId, const void *input_ptr, tsk_size_t input_size, void *output_ptr, tsk_size_t *output_size, tsk_bool_t stream)
{
tsk_bool_t ret = tsk_true;
int i = 0;
/* For each compartment id create/retrieve one compressor instance */
tcomp_compartment_t *lpCompartment = tcomp_statehandler_getCompartment(dispatcher->stateHandler, compartmentId);
if(!lpCompartment) {
TSK_DEBUG_ERROR("You must provide a valid compartment to perform compression.");
return tsk_false;
}
/*
* Performs compression.
*/
tsk_safeobj_lock(dispatcher);
for( i = 0; (i < TCOMP_MAX_COMPRESSORS && dispatcher->compressors[i]); i++ ) {
if((ret = dispatcher->compressors[i](lpCompartment, input_ptr, input_size, output_ptr, output_size, stream))) {
break;
}
}
tsk_safeobj_unlock(dispatcher);
/*
* STREAM case. FIXME:Because I'm a lazy man I only support 0xFF00 case
*/
if(stream) {
uint8_t* escapedBuffer;
tsk_size_t i, j;
tsk_size_t escapedBufferSize = (*output_size + 2); /* 2 = strlen(0xffff) */
for(i = 0; i < *output_size ; i++) {
escapedBufferSize += ((uint8_t*)output_ptr)[i] == 0xff ? 1 : 0;
}
escapedBuffer = (uint8_t*)tsk_calloc(escapedBufferSize, sizeof(uint8_t));
for(i = 0, j = 0; i < *output_size; i++, j++) {
escapedBuffer[j] = ((uint8_t*)output_ptr)[i];
if(escapedBuffer[j] == 0xff) {
escapedBuffer[++j] = 0x00;
}
}
/* End stream */
escapedBuffer[escapedBufferSize-1] = escapedBuffer[escapedBufferSize-2] = 0xff;
memcpy(output_ptr, escapedBuffer, escapedBufferSize);
*output_size = escapedBufferSize; /* Update size */
TSK_FREE(escapedBuffer); /* free */
}
/*
* NACK
*/
if(ret && TCOMP_NACK_SUPPORTED) {
/* store nack for later retrieval in case of errors */
uint8_t nackId[TSK_SHA1_DIGEST_SIZE];
tsk_sha1context_t sha;
tsk_sha1reset(&sha);
tsk_sha1input(&sha, (const uint8_t*)output_ptr, *output_size);
tsk_sha1result(&sha, (uint8_t*)nackId);
tcomp_compartment_addNack(lpCompartment, nackId);
}
return ret;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
/// Adds new compressor the list of the compressors.
///
///
/// @param [in,out] dispatcher The compressor dispatcher.
/// @param compressor A function pointer to the new compressor.
////////////////////////////////////////////////////////////////////////////////////////////////////
int tcomp_compressordisp_addCompressor(tcomp_compressordisp_t *dispatcher, tcomp_compressor_compress_f compressor)
{
tsk_size_t i;
if(!dispatcher) {
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
for(i = 0; i < TCOMP_MAX_COMPRESSORS; i++) {
if(!dispatcher->compressors[i]) {
dispatcher->compressors[i] = compressor;
return 0;
}
}
return -2;
}
/** Removes a compressor
*/
int tcomp_compressordisp_removeCompressor(tcomp_compressordisp_t *dispatcher, tcomp_compressor_compress_f compressor)
{
tsk_size_t i;
if(!dispatcher) {
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
for(i = 0; i < TCOMP_MAX_COMPRESSORS; i++) {
if(dispatcher->compressors[i] == compressor) {
dispatcher->compressors[i] = tsk_null;
return 0;
}
}
return -2;
}
//========================================================
// SigComp compressor dispatcher object definition
//
static tsk_object_t* tcomp_compressordisp_ctor(tsk_object_t * self, va_list * app)
{
tcomp_compressordisp_t *compressordisp = self;
if(compressordisp) {
int i = 0;
compressordisp->stateHandler = va_arg(*app, const tcomp_statehandler_t*);
compressordisp->compressors[0] = tcomp_compressor_deflate_compress; /* If you don't want deflate compressor then remove this line. */
compressordisp->compressors[1] = tcomp_compressor_dummy_compress; /* RFC 4896 [11. Uncompressed Bytecode]. */
/* Initialize safeobject */
tsk_safeobj_init(compressordisp);
}
else {
TSK_DEBUG_ERROR("Failed to create new compressor dispatcher.");
}
return self;
}
static tsk_object_t* tcomp_compressordisp_dtor(tsk_object_t *self)
{
tcomp_compressordisp_t *compressordisp = self;
if(compressordisp) {
/* Deinitialize safeobject */
tsk_safeobj_deinit(compressordisp);
memset(compressordisp->compressors, 0 , sizeof(compressordisp->compressors));
compressordisp->stateHandler = tsk_null; // not owner
}
else {
TSK_DEBUG_ERROR("Null dispatcher.");
}
return self;
}
static const tsk_object_def_t tcomp_compressordisp_def_s = {
sizeof(tcomp_compressordisp_t),
tcomp_compressordisp_ctor,
tcomp_compressordisp_dtor,
tsk_null
};
const tsk_object_def_t *tcomp_compressordisp_def_t = &tcomp_compressordisp_def_s;
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