diff options
Diffstat (limited to 'tinySIGCOMP/src/tcomp_udvm.bytecopy.c')
| -rw-r--r-- | tinySIGCOMP/src/tcomp_udvm.bytecopy.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/tinySIGCOMP/src/tcomp_udvm.bytecopy.c b/tinySIGCOMP/src/tcomp_udvm.bytecopy.c new file mode 100644 index 0000000..07bd983 --- /dev/null +++ b/tinySIGCOMP/src/tcomp_udvm.bytecopy.c @@ -0,0 +1,132 @@ +/* +* Copyright (C) 2009-2010 Mamadou Diop. +* +* Contact: Mamadou Diop <diopmamadou(at)doubango.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> + * + * @date Created: Sat Nov 8 16:54:58 2009 mdiop + */ +#include "tcomp_udvm.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 +*/ +int tcomp_udvm_bytecopy_self(tcomp_udvm_t *udvm, uint16_t *destination, uint16_t source, uint16_t tsk_size_tocopy) +{ + uint16_t byte_copy_left, byte_copy_right; + //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 0; + } + + /* + * 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--)) + { + *TCOMP_UDVM_GET_BUFFER_AT((*destination)++) = *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 1; +} + +/**RFC3320-Setction_8.4. Byte copying +From EXTERNAL to UDVM +*/ +int tcomp_udvm_bytecopy_to(tcomp_udvm_t *udvm, uint16_t destination, const uint8_t* source, uint16_t tsk_size_tocopy) +{ + uint16_t byte_copy_left, byte_copy_right; + + if(destination == TCOMP_UDVM_GET_SIZE()) + { + /* SEGFAULT */ + tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT); + return 0; + } + + /* + * 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--)) + { + *TCOMP_UDVM_GET_BUFFER_AT(destination++) = *(source++); + + destination = (destination == byte_copy_right)? byte_copy_left : destination; + } + + return 1; +} + +/**RFC3320-Setction_8.4. Byte copying +From UDVM to EXTERNAL +*/ +int tcomp_udvm_bytecopy_from(tcomp_udvm_t *udvm, uint8_t* destination, uint16_t source, uint16_t tsk_size_tocopy) +{ + uint16_t byte_copy_left, byte_copy_right; + + if(source == TCOMP_UDVM_GET_SIZE()) + { + /* SEGFAULT */ + tcomp_udvm_createNackInfo2(udvm, NACK_SEGFAULT); + return 0; + } + + /* + * 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--)) + { + *(destination++) = *TCOMP_UDVM_GET_BUFFER_AT(source++); + + source = (source == byte_copy_right)? byte_copy_left : source; + } + + return 1; +} |
