diff options
Diffstat (limited to 'tinySIGCOMP/src/tcomp_udvm.statemanagment.c')
| -rw-r--r-- | tinySIGCOMP/src/tcomp_udvm.statemanagment.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/tinySIGCOMP/src/tcomp_udvm.statemanagment.c b/tinySIGCOMP/src/tcomp_udvm.statemanagment.c new file mode 100644 index 0000000..80a0a45 --- /dev/null +++ b/tinySIGCOMP/src/tcomp_udvm.statemanagment.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.statemanagment.c + * @brief SigComp UDVM machine (State managment) + * + * @author Mamadou Diop <diopmamadou(at)yahoo.fr> + * + * @date Created: Sat Nov 8 16:54:58 2009 mdiop + */ +#include "tcomp_udvm.h" + + +int tcomp_udvm_byteCopy_TempStates(tcomp_udvm_t *udvm) +{ + int ok = 1; + uint8_t i; + uint8_t tocreate_size = tcomp_result_getTempStatesToCreateSize(udvm->lpResult); + uint8_t tofree_size = tcomp_result_getTempStatesToFreeSize(udvm->lpResult); + + + /* + * State Create + */ + for(i = 0; i < tocreate_size; i++) + { + /* + * The UDVM byte copies a string of state_length bytes from the UDVM + * memory beginning at state_address (obeying the rules of Section 8.4). + * This is the state_value. + */ + tcomp_state_t* lpState = udvm->lpResult->statesToCreate[i]; + tcomp_buffer_allocBuff(lpState->value, lpState->length); + ok &= tcomp_udvm_bytecopy_from(udvm, tcomp_buffer_getBuffer(lpState->value), lpState->address, lpState->length); + } + + /* + * State Free + */ + for(i = 0; i<tofree_size; i++) + { + tcomp_tempstate_to_free_t *lpDesc = udvm->lpResult->statesToFree[i]; + tcomp_buffer_allocBuff(lpDesc->identifier, lpDesc->partial_identifier_length); + ok &= tcomp_udvm_bytecopy_from(udvm, tcomp_buffer_getBuffer(lpDesc->identifier), lpDesc->partial_identifier_start, lpDesc->partial_identifier_length); + } + return ok; +} + +//////////////////////////////////////////////////////////////////////////////////////////////////// +/// +/// @brief Creates temporary state. +/// +/// @param [in,out] udvm If non-null, the udvm. +/// @param state_length Length of the state. +/// @param state_address The state address. +/// @param state_instruction The state instruction. +/// @param minimum_access_length Length of the minimum access. +/// @param state_retention_priority The state retention priority. +/// @param end_msg Message describing the end. +/// +/// @return 1 if succeed an zero otherwise. +//////////////////////////////////////////////////////////////////////////////////////////////////// + +int tcomp_udvm_createTempState(tcomp_udvm_t *udvm, uint16_t state_length, uint16_t state_address, uint16_t state_instruction, + uint16_t minimum_access_length, uint16_t state_retention_priority, int end_msg) +{ + /* + * If the specified minimum_access_length does not lie between 6 and 20 inclusive, or if + * the state_retention_priority is 65535 then the END-MESSAGE + * instruction fails to make a state creation request of its own + * (however decompression failure does not occur and the state creation + * requests made by the STATE-CREATE instruction are still valid). + */ + int is_ok = ( (6<=minimum_access_length && minimum_access_length<=20) && state_retention_priority!=65535 ); + + // if not ok and not END_MESSAGE --> decompression failure MUST occurs + if(!is_ok) + { + if(end_msg) return 1; + + if(state_retention_priority == 65535) + { + tcomp_udvm_createNackInfo2(udvm, NACK_INVALID_STATE_PRIORITY); + } + else + { + tcomp_udvm_createNackInfo2(udvm, NACK_INVALID_STATE_ID_LENGTH); + } + return 0; + } + + /* + * decompression failure occurs if the END-MESSAGE instruction makes a state creation request and four + * instances of the STATE-CREATE instruction have already been encountered. + */ + if(tcomp_result_getTempStatesToCreateSize(udvm->lpResult) >= MAX_TEMP_SATES) + { + tcomp_udvm_createNackInfo2(udvm, NACK_TOO_MANY_STATE_REQUESTS); + return 0; + } + + /* + * Is there a state to create? + */ + if(is_ok) + { + // no byte copy () + tcomp_state_t *lpState = tcomp_state_create(state_length, state_address, state_instruction, minimum_access_length, state_retention_priority); + tcomp_result_addTempStateToCreate(udvm->lpResult, lpState); + } + + return 1; +} |
