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decdecode.c
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/*====================================================================*
*
* size_t decdecode (void const * memory, size_t extent, char buffer [], size_t length);
*
* memory.h
*
* decode a memory block of given length in bytes as a string of
* separated hexadecimal bytes; terminate once the string fills
* or the memory ends; terminate the string and return the actual
* string bytes;
*
* allow three string characters for each memory byte; this means
* that the buffer must have at least three characters or nothing
* will be decoded; the maximum number of bytes is the lesser of
* chars/3 and bytes;;
*
* Motley Tools by Charles Maier <cmaier@cmassoc.net>;
* Copyright (c) 2001-2006 by Charles Maier Associates;
* Licensed under the Internet Software Consortium License;
*
*--------------------------------------------------------------------*/
#ifndef DECDECODE_SOURCE
#define DECDECODE_SOURCE
#include "../tools/memory.h"
#include "../tools/number.h"
size_t decdecode (void const * memory, register size_t extent, char buffer [], register size_t length)
{
register char * string = (char *)(buffer);
register byte * offset = (byte *)(memory);
if (length)
{
length /= DEC_DIGITS + 1;
while ((length--) && (extent--))
{
unsigned octet = *offset;
unsigned digit = DEC_DIGITS;
while (digit--)
{
string [digit] = '0' + octet % RADIX_DEC;
octet /= RADIX_DEC;
}
string += DEC_DIGITS;
if ((length) && (extent))
{
*string++ = DEC_EXTENDER;
}
offset++;
}
*string = (char) (0);
}
return (string - buffer);
}
#endif
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