packing.h

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/******************************************************************

    iLBC Speech Coder ANSI-C Source Code

    packing.h              

    Copyright (C) The Internet Society (2004). 
    All Rights Reserved.

******************************************************************/

#ifndef __PACKING_H
#define __PACKING_H

void packsplit(
    int *index,                 /* (i) the value to split */
    int *firstpart,             /* (o) the value specified by most 
                                       significant bits */
    int *rest,                  /* (o) the value specified by least 
                                       significant bits */
    int bitno_firstpart,    /* (i) number of bits in most 
                                       significant part */
    int bitno_total             /* (i) number of bits in full range 
                                       of value */
);

void packcombine( 
    int *index,                 /* (i/o) the msb value in the 
                                       combined value out */
    int rest,                   /* (i) the lsb value */
    int bitno_rest              /* (i) the number of bits in the 
                                       lsb part */
);

void dopack( 
    unsigned char **bitstream,  /* (i/o) on entrance pointer to 
                                       place in bitstream to pack 
                                       new data, on exit pointer 
                                       to place in bitstream to 
                                       pack future data */
    int index,                  /* (i) the value to pack */
    int bitno,                  /* (i) the number of bits that the 
                                       value will fit within */
    int *pos                /* (i/o) write position in the 
                                       current byte */
);

void unpack( 
    unsigned char **bitstream,  /* (i/o) on entrance pointer to 


                                       place in bitstream to 
                                       unpack new data from, on 
                                       exit pointer to place in 
                                       bitstream to unpack future 
                                       data from */
    int *index,                 /* (o) resulting value */
    int bitno,                  /* (i) number of bits used to 
                                       represent the value */
    int *pos                /* (i/o) read position in the 
                                       current byte */
);

#endif