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https://github.com/tuxbox-neutrino/neutrino.git
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c8e87eb023
git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@106 e54a6e83-5905-42d5-8d5c-058d10e6a962
97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/*
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* $Header: /cvs/tuxbox/apps/misc/libs/libconnection/messagetools.cpp,v 1.1 2002/12/07 13:37:06 thegoodguy Exp $
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*
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* tools used in clientlib <-> daemon communication - d-box2 linux project
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*
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* (C) 2002 by thegoodguy <thegoodguy@berlios.de>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "messagetools.h"
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size_t write_length_field (unsigned char * buffer, unsigned int length)
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{
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if (length < 128)
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{
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buffer[0] = static_cast<unsigned char>(length);
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return 1;
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}
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else
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{
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unsigned int pos = 0;
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unsigned int shiftby = 8;
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unsigned char length_field_size = 1;
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while ((length >> shiftby) != 0)
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{
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length_field_size++;
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shiftby += 8;
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}
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buffer[pos++] = ((1 << 7) | length_field_size);
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while (shiftby != 0)
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{
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shiftby -= 8;
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buffer[pos++] = static_cast<unsigned char>(length >> shiftby);
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}
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return pos;
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}
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}
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unsigned int parse_length_field (const unsigned char * buffer)
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{
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unsigned char size_indicator = (buffer[0] >> 7) & 0x01;
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unsigned int length_value = 0;
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if (size_indicator == 0)
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{
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length_value = buffer[0] & 0x7F;
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}
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else if (size_indicator == 1)
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{
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unsigned char length_field_size = static_cast<unsigned char>(buffer[0] & 0x7F);
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unsigned int i;
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for (i = 0; i < length_field_size; i++)
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{
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length_value = (length_value << 8) | buffer[i + 1];
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}
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}
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return length_value;
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}
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size_t get_length_field_size (const unsigned int length)
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{
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if (length < 0x80)
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return 0x01;
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if (length < 0x100)
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return 0x02;
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if (length < 0x10000)
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return 0x03;
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if (length < 0x1000000)
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return 0x04;
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return 0x05;
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}
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