//base64.c:

/*
 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010
 *
 *  This file is part of libroar a part of RoarAudio,
 *  a cross-platform sound system for both, home and professional use.
 *  See README for details.
 *
 *  This file is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 3
 *  as published by the Free Software Foundation.
 *
 *  libroar is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this software; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 *  NOTE for everyone want's to change something and send patches:
 *  read README and HACKING! There a addition information on
 *  the license of this document you need to read before you send
 *  any patches.
 *
 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
 *  or libpulse*:
 *  The libs libroaresd, libroararts and libroarpulse link this lib
 *  and are therefore GPL. Because of this it may be illigal to use
 *  them with any software that uses libesd, libartsc or libpulse*.
 */

#include "libroar.h"

static char _base64_tab_fw[] =
 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 "abcdefghijklmnopqrstuvwxyz"
 "0123456789+/";

static char _base64_tab_bw[] = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
  0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
  0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
  0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
  0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
  0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
  0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};


int roar_base64_init(struct roar_base64 * state, int flags) {
 if ( flags == -1 )
  flags = 0;

 if ( state == NULL )
  return -1;

 memset(state, 0, sizeof(struct roar_base64));

 state->flags = flags;

 return 0;
}

static inline void _libroar_base64_encode_block(unsigned char out[4], const unsigned char in[3]) {
 out[0] = _base64_tab_fw[(in[0] >> 2) & 0x3F];
 out[1] = _base64_tab_fw[(((in[0] & 0x03) << 4) | (in[1] >> 4)) & 0x3F];
 out[2] = _base64_tab_fw[(((in[1] & 0x0F) << 2) | ((in[2] >> 6) & 0x03)) & 0x3F];
 out[3] = _base64_tab_fw[in[2] & 0x3F];
}

#define _setoff(x) do { if ( off != NULL ) { *off = (x) } } while (0)

ssize_t roar_base64_encode(struct roar_base64 * state, void * out, size_t outlen, void * in, size_t inlen, size_t * off, int eof) {
 struct roar_base64 state_store;
 size_t offset = 0;
 size_t tlen;

 if ( inlen && in == NULL )
  return -1;

 if ( outlen && out == NULL )
  return -1;

 // this test should be removed as soon as those modes are supported.
 if ( in == NULL || out == NULL )
  return -1;

 if ( state == NULL ) {
  state = &state_store;
  roar_base64_init_encode(state);
  eof = 1;
 }

 if ( state->buflen ) {
  if ( (state->buflen + inlen) >= 3 ) {
   tlen = 3 - state->buflen;
   memcpy(state->buf + state->buflen, in, tlen);
   offset += tlen;
   in += tlen;
   inlen -= tlen;
  } else {
   memcpy(state->buf + state->buflen, in, inlen);
   _setoff(inlen);
   return 0;
  }
 }
}

ssize_t roar_base64_decode(struct roar_base64 * state, void * out, size_t outlen, void * in, size_t inlen, size_t * off);

int roar_base64_is_eof(struct roar_base64 * state) {
 if ( state == NULL )
  return -1;

 return !!(state->flags & ROAR_BASE64_FLAG_EOF);
}

int roar_base64_uninit(struct roar_base64 * state) {
 if ( state == NULL )
  return -1;

 if ( state->buflen ) {
  ROAR_WARN("roar_base64_uninit(state=%p): State has bytes left in IO buffer. This is a application error.");
 }

 if ( state->reglen ) {
  ROAR_WARN("roar_base64_uninit(state=%p): State has bits left in decode register. This is a application error.");
 }

 return 0;
}

//ll