142 lines
4.7 KiB
C
Executable File
142 lines
4.7 KiB
C
Executable File
/*
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* Copyright (C) 2010-2011 Mamadou Diop.
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*
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* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*
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*/
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/**@file tcomp_udvm.nack.c
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* @brief SigComp UDVM machine (byte copying).
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*
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* @author Mamadou Diop <diopmamadou(at)yahoo.fr>
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*
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*/
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#include "tcomp_udvm.h"
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#include "tsk_debug.h"
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#define TCOMP_UDVM_MEMORY_REGISTERS_PTR TCOMP_UDVM_GET_BUFFER_AT(UDVM_REGISTERS_START)
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/**RFC3320-Setction_8.4. Byte copying
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From UDVM to UDVM
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*/
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tsk_bool_t tcomp_udvm_bytecopy_self(tcomp_udvm_t *udvm, uint32_t *destination, uint32_t source, uint32_t tsk_size_tocopy)
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{
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uint32_t byte_copy_left, byte_copy_right;
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uint8_t* destination_ptr;
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//if (*destination == TCOMP_UDVM_GET_SIZE() || source == TCOMP_UDVM_GET_SIZE())
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if (*destination >= TCOMP_UDVM_GET_SIZE() || source >= TCOMP_UDVM_GET_SIZE()) {
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/* SEGFAULT */
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tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
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return tsk_false;
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}
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/*
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* The string of bytes is copied in ascending order of memory address,
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* respecting the bounds set by byte_copy_left and byte_copy_right.
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*/
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byte_copy_left = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_LEFT_INDEX);
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byte_copy_right = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_RIGHT_INDEX);
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// string of bytes is copied one byte at a time
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while((tsk_size_tocopy--)) {
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if(!(destination_ptr = TCOMP_UDVM_GET_BUFFER_AT((*destination)++))) {
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tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
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return tsk_false;
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}
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*destination_ptr = *TCOMP_UDVM_GET_BUFFER_AT(source++);
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*destination = (*destination == byte_copy_right)? byte_copy_left : *destination;
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source = (source == byte_copy_right)? byte_copy_left : source;
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}
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return tsk_true;
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}
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/**RFC3320-Setction_8.4. Byte copying
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From EXTERNAL to UDVM
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*/
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tsk_bool_t tcomp_udvm_bytecopy_to(tcomp_udvm_t *udvm, uint32_t destination, const uint8_t* source, uint32_t tsk_size_tocopy)
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{
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uint32_t byte_copy_left, byte_copy_right;
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uint8_t* destination_ptr;
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if(destination == TCOMP_UDVM_GET_SIZE()) {
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/* SEGFAULT */
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tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
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return tsk_false;
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}
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/*
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* The string of bytes is copied in ascending order of memory address,
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* respecting the bounds set by byte_copy_left and byte_copy_right.
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*/
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byte_copy_left = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_LEFT_INDEX);
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byte_copy_right = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_RIGHT_INDEX);
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// string of bytes is copied one byte at a time
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while((tsk_size_tocopy--)) {
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if(!(destination_ptr = TCOMP_UDVM_GET_BUFFER_AT(destination++))) {
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tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
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return tsk_false;
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}
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*destination_ptr = *(source++);
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destination = (destination == byte_copy_right)? byte_copy_left : destination;
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}
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return tsk_true;
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}
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/**RFC3320-Setction_8.4. Byte copying
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From UDVM to EXTERNAL
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*/
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tsk_bool_t tcomp_udvm_bytecopy_from(tcomp_udvm_t *udvm, uint8_t* destination, uint32_t source, uint32_t tsk_size_tocopy)
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{
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uint32_t byte_copy_left, byte_copy_right;
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uint8_t* source_ptr;
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if(source >= TCOMP_UDVM_GET_SIZE()) {
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TSK_DEBUG_ERROR("SEGFAULT");
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tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
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return tsk_false;
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}
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/*
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* The string of bytes is copied in ascending order of memory address,
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* respecting the bounds set by byte_copy_left and byte_copy_right.
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*/
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byte_copy_left = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_LEFT_INDEX);
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byte_copy_right = TCOMP_UDVM_GET_2BYTES_VAL(TCOMP_UDVM_HEADER_BYTE_COPY_RIGHT_INDEX);
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// string of bytes is copied one byte at a time
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while((tsk_size_tocopy--)) {
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if(!(source_ptr = TCOMP_UDVM_GET_BUFFER_AT(source++))) {
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tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT);
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return tsk_false;
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}
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*(destination++) = *source_ptr;
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source = (source == byte_copy_right)? byte_copy_left : source;
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}
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return tsk_true;
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}
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