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/************************************************************************/
/* */
/* Utilities to translate back and forth between binary and base85 */
/* */
/************************************************************************/
# include "utilBase85.h"
const unsigned char UTIL_Base85Digits[]=
"!\"#$%&'()*+,-./0123456789:;<=>?@"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"[\\]^_`"
"abcdefghijklmnopqrstu";
const int * utilBase85GetIndexArray( void )
{
static int UTIL_Base85IndexArray[256];
if ( UTIL_Base85IndexArray[0] == 0 )
{
int i;
for ( i= 0; i < 256; i++ )
{ UTIL_Base85IndexArray[i]= 0xff; }
i= 0;
while( UTIL_Base85Digits[i] )
{ UTIL_Base85IndexArray[UTIL_Base85Digits[i]]= i; i++; }
}
return UTIL_Base85IndexArray;
}
int utilBase85Make( int * d,
const unsigned char * b,
int last )
{
int i;
unsigned long v;
v= 0;
for ( i= 0; i < 4; i++ )
{ v= 256* v+ b[i]; }
if ( v == 0 && ! last )
{ d[0]= 'z'; return 1; }
for ( i= 0; i < 5; i++ )
{ d[4-i]= UTIL_Base85Digits[v%85]; v /= 85; }
return 5;
}
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