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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_udvm.nack.c
* @brief SigComp UDVM machine (byte copying).
*
* @author Mamadou Diop <diopmamadou(at)yahoo.fr>
*
*/
#include "tcomp_udvm.h"
#include "tsk_debug.h"
#define TCOMP_UDVM_MEMORY_REGISTERS_PTR TCOMP_UDVM_GET_BUFFER_AT(UDVM_REGISTERS_START)
/**RFC3320-Setction_8.4. Byte copying
From UDVM to UDVM
*/
tsk_bool_t tcomp_udvm_bytecopy_self(tcomp_udvm_t *udvm, uint32_t *destination, uint32_t source, uint32_t tsk_size_tocopy)
{
uint32_t byte_copy_left, byte_copy_right;
uint8_t* destination_ptr;
//if (*destination == TCOMP_UDVM_GET_SIZE() || source == TCOMP_UDVM_GET_SIZE())
if (*destination >= TCOMP_UDVM_GET_SIZE() || source >= TCOMP_UDVM_GET_SIZE())
{
/* SEGFAULT */
tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
return tsk_false;
}
/*
* The string of bytes is copied in ascending order of memory address,
* respecting the bounds set by byte_copy_left and byte_copy_right.
*/
byte_copy_left = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_LEFT_INDEX);
byte_copy_right = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_RIGHT_INDEX);
// string of bytes is copied one byte at a time
while((tsk_size_tocopy--))
{
if(!(destination_ptr = TCOMP_UDVM_GET_BUFFER_AT((*destination)++))){
tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
return tsk_false;
}
*destination_ptr = *TCOMP_UDVM_GET_BUFFER_AT(source++);
*destination = (*destination == byte_copy_right)? byte_copy_left : *destination;
source = (source == byte_copy_right)? byte_copy_left : source;
}
return tsk_true;
}
/**RFC3320-Setction_8.4. Byte copying
From EXTERNAL to UDVM
*/
tsk_bool_t tcomp_udvm_bytecopy_to(tcomp_udvm_t *udvm, uint32_t destination, const uint8_t* source, uint32_t tsk_size_tocopy)
{
uint32_t byte_copy_left, byte_copy_right;
uint8_t* destination_ptr;
if(destination == TCOMP_UDVM_GET_SIZE())
{
/* SEGFAULT */
tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
return tsk_false;
}
/*
* The string of bytes is copied in ascending order of memory address,
* respecting the bounds set by byte_copy_left and byte_copy_right.
*/
byte_copy_left = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_LEFT_INDEX);
byte_copy_right = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_RIGHT_INDEX);
// string of bytes is copied one byte at a time
while((tsk_size_tocopy--))
{
if(!(destination_ptr = TCOMP_UDVM_GET_BUFFER_AT(destination++))){
tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
return tsk_false;
}
*destination_ptr = *(source++);
destination = (destination == byte_copy_right)? byte_copy_left : destination;
}
return tsk_true;
}
/**RFC3320-Setction_8.4. Byte copying
From UDVM to EXTERNAL
*/
tsk_bool_t tcomp_udvm_bytecopy_from(tcomp_udvm_t *udvm, uint8_t* destination, uint32_t source, uint32_t tsk_size_tocopy)
{
uint32_t byte_copy_left, byte_copy_right;
uint8_t* source_ptr;
if(source >= TCOMP_UDVM_GET_SIZE()){
TSK_DEBUG_ERROR("SEGFAULT");
tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
return tsk_false;
}
/*
* The string of bytes is copied in ascending order of memory address,
* respecting the bounds set by byte_copy_left and byte_copy_right.
*/
byte_copy_left = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_LEFT_INDEX);
byte_copy_right = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_RIGHT_INDEX);
// string of bytes is copied one byte at a time
while((tsk_size_tocopy--)){
if(!(source_ptr = TCOMP_UDVM_GET_BUFFER_AT(source++))){
tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
return tsk_false;
}
*(destination++) = *source_ptr;
source = (source == byte_copy_right)? byte_copy_left : source;
}
return tsk_true;
}
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