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/*
* Base64.c
* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
unsigned char map2[] =
{
0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 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
};
int b64_decode(lua_State *L)
{
int i, v;
unsigned char out[512];
unsigned char *dst = out;
char *in;
if(lua_gettop(L) != 1)
{
lua_pushstring(L, "invalid arg list");
lua_error(L);
return 0;
}
in = (char *)lua_tostring (L, 1);
v = 0;
for (i = 0; in[i] && in[i] != '='; i++) {
unsigned int index= in[i]-43;
if (index>=(sizeof(map2)/sizeof(map2[0])) || map2[index] == 0xff)
return -1;
v = (v << 6) + map2[index];
if (i & 3) {
if (dst - out < 512) {
*dst++ = v >> (6 - 2 * (i & 3));
}
}
}
if(!(dst - out))
return 0;
lua_pushlstring(L, (char*)out, dst - out);
return 1;
}
/*****************************************************************************
* b64_encode: stolen from VLC's http.c
* simplified by michael
* fixed edge cases and made it work from data (vs. strings) by ryan.
*****************************************************************************/
int b64_encode(lua_State *L)
{
static const char b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char *ret, *dst, *src, tmp[1024];
unsigned i_bits = 0;
int i_shift = 0;
int bytes_remaining, len;
if(lua_gettop(L) != 1)
{
lua_pushstring(L, "invalid arg list");
lua_error(L);
return 0;
}
src = (char *)lua_tostring (L, 1);
bytes_remaining = len = strlen(src);
if (len < 512) {
ret = dst = tmp;
} else
return 0;
if (len) { // special edge case, what should we really do here?
while (bytes_remaining) {
i_bits = (i_bits << 8) + *src++;
bytes_remaining--;
i_shift += 8;
do {
*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
i_shift -= 6;
} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
}
while ((dst - ret) & 3)
*dst++ = '=';
}
*dst = '\0';
lua_pushstring(L, tmp);
return 1;
}
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