Base64.h

/*hdr
**      FILE:           Base64.h
**      AUTHOR:         Matthew Allen
**      DATE:           1/6/98
**      DESCRIPTION:    Base64 encoding/decoding
**
**      Copyright (C) 1998, Matthew Allen
**              fret@memecode.com
*/

#ifndef __BASE64_H_
#define __BASE64_H_

#include "LgiDefs.h"

// These buffer length macros round up to the nearest block of
// bytes. So take the value returned by the convert routine as
// the actual value... but use these to allocate buffers.
#define BufferLen_64ToBin(l)        ( ((l)*3)/4 )
#define BufferLen_BinTo64(l)        ( ((((l)+2)/3)*4) )

// Character Conversion Routines
//
// Format of Base64 char:
// 7               0
// |-|-|-|-|-|-|-|-|
// |-U-|--- Data --|
//
// Data = Bits, 0-63
// U    = Unused, must be 0
//
LgiFunc uchar Base64ToBin(char c);
LgiFunc char BinToBase64(uchar c);

// String Conversion Routines
//
// Arguments:
//  Binary:     Pointer to binary buffer
//  OutBuf:     Size of output buffer (in bytes)
//  Base64:     Pointer to Base64 buffer
//  InBuf:      Size of input buffer (in bytes)
//
// Returns:
//  Number of bytes converted.
//
LgiFunc int ConvertBase64ToBinary(uchar *Binary, int OutBuf, char *Base64, int InBuf);
LgiFunc int ConvertBinaryToBase64(char *Base64, int OutBuf, uchar *Binary, int InBuf);

#endif

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