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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_state.c
* @brief SigComp state.
*
* @author Mamadou Diop <diopmamadou(at)yahoo.fr>
*
*/
#include "tcomp_state.h"
#include "tsk_memory.h"
#include "tsk_debug.h"
#include "tsk_sha1.h"
/** Creates new SigComp state.
*/
tcomp_state_t* tcomp_state_create(uint32_t length, uint32_t address, uint32_t instruction, uint32_t minimum_access_length, uint32_t retention_priority)
{
tcomp_state_t *state;
if((state = tsk_object_new(tcomp_state_def_t))){
state->length = length;
state->address = address;
state->instruction = instruction;
state->minimum_access_length = minimum_access_length;
state->retention_priority = retention_priority;
state->value = tcomp_buffer_create_null();
state->identifier = tcomp_buffer_create_null();
}
else{
TSK_DEBUG_ERROR("Failed to create new state.");
}
return state;
}
/** Compares two sigomp states.
* @param state1 First state to compare.
* @param state2 Second state to compare.
* @retval 1 if the two handles are equals and 0 otherwise.
*/
int tcomp_state_equals(const tcomp_state_t *state1, const tcomp_state_t *state2)
{
if(state1 && state2)
{
return tcomp_buffer_equals(state1->identifier, state2->identifier);
}
else if(!state1 && !state2) return 1;
else return 0;
}
/**Computes the state identifier by calculating a 20-byte SHA-1 hash [RFC-3174] over the
* byte string formed by concatenating the state_length, state_address,
* state_instruction, minimum_access_length and state_value (in the order given).
* @param state The state to make valid.
*/
void tcomp_state_makeValid(tcomp_state_t* state)
{
tsk_sha1context_t sha;
if(!state){
TSK_DEBUG_ERROR("Invalid parameter");
return;
}
/* Lock */
tsk_safeobj_lock(state);
tcomp_buffer_allocBuff(state->identifier, TSK_SHA1_DIGEST_SIZE);
/*=============
* Calculates a 20-byte SHA-1 hash [RFC-3174] over the byte string formed by concatenating the state_length, state_address,
* state_instruction, minimum_access_length and state_value (in the order given). This is the state_identifier.
*/
{
uint8_t i;
int32_t err = tsk_sha1reset(&sha);
uint8_t firstPart[8];
#ifdef __SYMBIAN32__
uint32_t values[4];
values[0] = state->length,
values[1] = state->address,
values[2] = state->instruction,
values[3] = state->minimum_access_length;
#else
uint32_t values[4] = { state->length, state->address, state->instruction, state->minimum_access_length };
#endif
for(i=0; i<4; i++)
{
#if 0 /*BIG_ENDIAN*/// Do not change this (it's for my own tests)
firstPart[i] = (values[i] & 0xff);
firstPart[i+1] = (values[i] >> 8);
#else
firstPart[2*i] = (values[i] >> 8);
firstPart[2*i+1] = (values[i]& 0xff);
#endif
}
tsk_sha1input(&sha, firstPart, 8);
tsk_sha1input(&sha, tcomp_buffer_getBuffer(state->value), tcomp_buffer_getSize(state->value));
err = tsk_sha1result(&sha, (uint8_t*)tcomp_buffer_getBuffer(state->identifier));
}
/* unlock */
tsk_safeobj_unlock(state);
}
int32_t tcomp_state_inc_usage_count(tcomp_state_t* self)
{
if(!self){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
return ++self->usage_count;
}
int32_t tcomp_state_dec_usage_count(tcomp_state_t* self)
{
if(!self || self->usage_count <= 0){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
return --self->usage_count;
}
//========================================================
// State object definition
//
static tsk_object_t* tcomp_state_ctor(tsk_object_t * self, va_list * app)
{
tcomp_state_t *state = self;
if(state){
/* Initialize safeobject */
tsk_safeobj_init(state);
}
else{
TSK_DEBUG_ERROR("Failed to create new state.");
}
return state;
}
static tsk_object_t* tcomp_state_dtor(tsk_object_t *self)
{
tcomp_state_t *state = self;
if(state){
TSK_DEBUG_INFO("==SigComp - Free state with id=");
tcomp_buffer_print(state->identifier);
/* Deinitialize safeobject */
tsk_safeobj_deinit(state);
TSK_OBJECT_SAFE_FREE(state->identifier);
TSK_OBJECT_SAFE_FREE(state->value);
}
else{
TSK_DEBUG_ERROR("Null SigComp state.");
}
return self;
}
static int tcomp_state_cmp(const void *obj1, const void *obj2)
{
const tcomp_state_t *state1 = obj1;
const tcomp_state_t *state2 = obj2;
if(state1 && state2){
return tcomp_buffer_equals(state1->identifier, state2->identifier) ? 0 : -1;
}
else if(!state1 && !state2) return 0;
else return -1;
}
static const tsk_object_def_t tcomp_state_def_s =
{
sizeof(tcomp_state_t),
tcomp_state_ctor,
tcomp_state_dtor,
tcomp_state_cmp
};
const tsk_object_def_t *tcomp_state_def_t = &tcomp_state_def_s;
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