85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* $Id$
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******************************************************************************
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Fax program for ISDN.
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Scrambler.
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Copyright (C) 1998 Morten Rolland [Morten.Rolland@asker.mail.telia.com]
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************
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*/
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#include <stdarg.h>
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#include <ifax/ifax.h>
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#include <ifax/modules/scrambler17.h>
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#define MAXBUFFERING 256
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typedef struct {
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unsigned int state;
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unsigned char buffer[MAXBUFFERING];
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} scrambler_private;
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/* Free the private data
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*/
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void scrambler_destroy(ifax_modp self)
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{
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free(self->private);
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return;
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}
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int scrambler_command(ifax_modp self,int cmd,va_list cmds)
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{
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return 0;
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}
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int scrambler_handle(ifax_modp self, void *data, size_t length)
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{
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scrambler_private *priv=(scrambler_private *)self->private;
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size_t chunk, remaining=length;
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while ( remaining > 0 ) {
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chunk = remaining;
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if ( chunk > MAXBUFFERING )
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chunk = MAXBUFFERING;
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scramble17(data,priv->buffer,&priv->state,chunk);
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ifax_handle_input(self->sendto,priv->buffer,chunk);
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remaining -= chunk;
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}
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return length;
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}
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int scrambler_construct(ifax_modp self,va_list args)
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{
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scrambler_private *priv;
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if (NULL==(priv=self->private=malloc(sizeof(scrambler_private))))
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return 1;
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self->destroy =scrambler_destroy;
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self->handle_input =scrambler_handle;
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self->command =scrambler_command;
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priv->state=0;
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return 0;
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}
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