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Diffstat (limited to 'tinySIGCOMP/src/tcomp_compressor_dummy.c')
| -rw-r--r-- | tinySIGCOMP/src/tcomp_compressor_dummy.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/tinySIGCOMP/src/tcomp_compressor_dummy.c b/tinySIGCOMP/src/tcomp_compressor_dummy.c new file mode 100644 index 0000000..34d062d --- /dev/null +++ b/tinySIGCOMP/src/tcomp_compressor_dummy.c @@ -0,0 +1,104 @@ +/* +* 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_compressor_dummy.h + * @brief SigComp Dummy compressor. Used if none match. See RFC 4896 subclause 11. + * + * @author Mamadou Diop <diopmamadou(at)yahoo.fr> + * + + */ + +#include "tcomp_compressor_dummy.h" +#include "tcomp_buffer.h" + +#include <string.h> + +#define UNCOMPRESSED_BYTECODE_LENGTH 13 +#define UNCOMPRESSED_BYTECODE_DESTINATION_CODE 0x01 /* 128 */ +#define DUMMYCOMPRESSOR_UNCOMPRESSED_BYTECODE \ + "\xf8\x00\xa1\x1c\x01\x86\x09\x22\x86\x01\x16\xf9\x23" + + + +//////////////////////////////////////////////////////////////////////////////////////////////////// +/// +/// @brief Dummy compressor as per RFC 4896 subclause 11. This function is used to create uncompressed sigcomp message. +/// Used if none match. +/// +/// @param [in,out] lpCompartment The compartment to use. +/// @param [in,out] input_ptr The input buffer containing the message to compress. +/// @param input_size The size of the input buffer. +/// @param [in,out] output_ptr The output buffer where to copy the compressed message. +/// @param [in,out] output_size The size of the output buffer. +/// @param stream Indicates whether it's a stream buffer or not. +/// +/// @return 1 if succedd and 0 otherwise. +//////////////////////////////////////////////////////////////////////////////////////////////////// +tsk_bool_t tcomp_compressor_dummy_compress(tcomp_compartment_t *lpCompartment, const void *input_ptr, tsk_size_t input_size, void *output_ptr, tsk_size_t *output_size, tsk_bool_t stream) +{ + tcomp_buffer_handle_t *output_buffer = tcomp_buffer_create_null(); + tsk_size_t pointer = 0; + uint8_t *header; + uint32_t codeLen; + + tcomp_buffer_referenceBuff(output_buffer, (uint8_t*)output_ptr, *output_size); + header = tcomp_buffer_getBufferAtPos(output_buffer, pointer++); + + /* SigComp Header */ + if(lpCompartment->lpReqFeedback && tcomp_buffer_getSize(lpCompartment->lpReqFeedback)){ + /* Return the requested feedback */ + *header = 0xfc; /* T=1 */ + memcpy(tcomp_buffer_getBufferAtPos(output_buffer, pointer), tcomp_buffer_getBuffer(lpCompartment->lpReqFeedback), tcomp_buffer_getSize(lpCompartment->lpReqFeedback)); + pointer += tcomp_buffer_getSize(lpCompartment->lpReqFeedback); + } + else{ + *header = 0xf8; + } + + codeLen = UNCOMPRESSED_BYTECODE_LENGTH; + /* first byte for codelen */ + *tcomp_buffer_getBufferAtPos(output_buffer, pointer++) = ((codeLen>>4)& 0x00ff); + + /* last 4 bits for codelen */ + *tcomp_buffer_getBufferAtPos(output_buffer, pointer) = ((codeLen & 0x000f)<<4); + + /* first and last 4 bits for destination */ + *tcomp_buffer_getBufferAtPos(output_buffer, pointer++) |= UNCOMPRESSED_BYTECODE_DESTINATION_CODE; + + /* + * Upload UDVM bytecode + */ + memcpy(tcomp_buffer_getBufferAtPos(output_buffer, pointer), (uint8_t*)DUMMYCOMPRESSOR_UNCOMPRESSED_BYTECODE, codeLen); + pointer += codeLen; + + /* + * Copy data uncompressed + */ + memcpy(tcomp_buffer_getBufferAtPos(output_buffer, pointer), input_ptr, input_size); + pointer += input_size; + *output_size = (pointer); + + TSK_OBJECT_SAFE_FREE(output_buffer); + + return tsk_true; +} |
