mdw@git.distorted.org.uk Git - mLib/blob - base64.h

   1 /* -*-c-*-
   2  *
   3  * $Id: base64.h,v 1.1 1999/05/17 20:35:00 mdw Exp $
   4  *
   5  * Base64 encoding and decoding
   6  *
   7  * (c) 1997 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the mLib utilities library.
  13  *
  14  * mLib is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * mLib is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with mLib; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: base64.h,v $
  33  * Revision 1.1  1999/05/17 20:35:00  mdw
  34  * Base64 encoding and decoding support.
  35  *
  36  */
  37
  38 #ifndef BASE64_H
  39 #define BASE64_H
  40
  41 #ifdef __cplusplus
  42   extern "C" {
  43 #endif
  44
  45 /*----- Header files ------------------------------------------------------*/
  46
  47 #include "dstr.h"
  48
  49 /*----- Data structures ---------------------------------------------------*/
  50
  51 typedef struct base64_ctx {
  52   unsigned long acc;                    /* Accumulator for output data */
  53   unsigned qsz;                         /* Length of data queued */
  54   unsigned lnlen;                       /* Length of the current line */
  55   const char *indent;                   /* Newline-and-indent string */
  56   unsigned maxline;                     /* Maximum permitted line length */
  57 } base64_ctx;
  58
  59 /*----- Functions provided ------------------------------------------------*/
  60
  61 /* --- @base64_encode@ --- *
  62  *
  63  * Arguments:   @base64_ctx *ctx@ = pointer to a context block
  64  *              @const unsigned char *src@ = pointer to a source buffer
  65  *              @size_t sz@ = size of the source buffer
  66  *              @dstr *d@ = pointer to destination string
  67  *
  68  * Returns:     ---
  69  *
  70  * Use:         Encodes a binary string in base64.  To flush out the final
  71  *              few characters (if necessary), pass a null source pointer.
  72  */
  73
  74 extern void base64_encode(base64_ctx */*ctx*/,
  75                           const unsigned char */*src*/, size_t /*sz*/,
  76                           dstr */*d*/);
  77
  78 /* --- @base64_decode@ --- *
  79  *
  80  * Arguments:   @base64_ctx *ctx@ = pointer to a context block
  81  *              @const unsigned char *src@ = pointer to a source buffer
  82  *              @size_t sz@ = size of the source buffer
  83  *              @dstr *d@ = pointer to destination string
  84  *
  85  * Returns:     ---
  86  *
  87  * Use:         Decodes a binary string in base64.  To flush out the final
  88  *              few characters (if necessary), pass a null source pointer.
  89  */
  90
  91 extern void base64_decode(base64_ctx */*ctx*/,
  92                           const unsigned char */*src*/, size_t /*sz*/,
  93                           dstr */*d*/);
  94
  95 /* --- @base64_init@ --- *
  96  *
  97  * Arguments:   @base64_ctx *ctx@ = pointer to context block to initialize
  98  *
  99  * Returns:     ---
 100  *
 101  * Use:         Initializes a base64 context properly.
 102  */
 103
 104 extern void base64_init(base64_ctx */*ctx*/);
 105
 106 /*----- That's all, folks -------------------------------------------------*/
 107
 108 #ifdef __cplusplus
 109   }
 110 #endif
 111
 112 #endif