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Add apps/netutils/codecs and associated NSH commands from Darcy Gong
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5280 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
359
netutils/codecs/base64.c
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359
netutils/codecs/base64.c
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/****************************************************************************
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* apps/include/netutils/base64.h
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*
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* This file is part of the NuttX RTOS:
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Darcy Gong
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*
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* Reference:
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*
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* Base64 encoding/decoding (RFC1341)
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* Copyright (c) 2005, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*
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* And is re-released under the NuttX modified BSD license:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <apps/netutils/base64.h>
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#ifdef CONFIG_CODECS_BASE64
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: base64_tab
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****************************************************************************/
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static void base64_tab(unsigned char *tab, size_t len, bool websafe)
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{
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static const char *_tab =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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memset(tab, 0, len);
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if (len >= 64)
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{
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memcpy(tab, _tab, 64);
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}
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if (websafe)
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{
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tab[62] = '-';
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tab[63] = '_';
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}
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}
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/****************************************************************************
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* Name: _base64_encode
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*
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* Description:
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* Base64 encode
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*
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* Caller is responsible for freeing the returned buffer. Returned buffer
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* is nul terminated to make it easier to use as a C string. The nul
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* terminator is not included in out_len.
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*
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* Input Parameters:
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* src: Data to be encoded
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* len: Length of the data to be encoded
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* out_len: Pointer to output length variable, or NULL if not used
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*
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* Returned Value:
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* Returns: Allocated buffer of out_len bytes of encoded data,
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* or NULL on failure
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*
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****************************************************************************/
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static unsigned char *_base64_encode(const unsigned char *src, size_t len,
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unsigned char *dst, size_t * out_len,
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bool websafe)
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{
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unsigned char *out;
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unsigned char *pos;
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const unsigned char *end;
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const unsigned char *in;
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size_t olen;
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/*int line_len; */
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unsigned char base64_table[64];
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char ch = '=';
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if (websafe)
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{
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ch = '.';
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}
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base64_tab(base64_table, sizeof(base64_table), websafe);
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olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
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#if 0
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olen += olen / 72; /* line feeds */
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olen++; /* nul termination */
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out = malloc(olen);
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if (out == NULL)
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{
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return NULL;
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}
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#endif
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end = src + len;
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in = src;
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if (dst)
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{
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pos = out = dst;
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}
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else
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{
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pos = out = malloc(olen);
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if (out == NULL)
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{
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return NULL;
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}
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}
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/*line_len = 0; */
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while (end - in >= 3)
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{
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*pos++ = base64_table[in[0] >> 2];
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*pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)];
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*pos++ = base64_table[((in[1] & 0x0f) << 2) | (in[2] >> 6)];
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*pos++ = base64_table[in[2] & 0x3f];
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in += 3;
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/* line_len += 4; */
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}
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if (end - in)
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{
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*pos++ = base64_table[in[0] >> 2];
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if (end - in == 1)
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{
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*pos++ = base64_table[(in[0] & 0x03) << 4];
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*pos++ = ch; /* *pos++ = '='; */
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}
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else
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{
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*pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)];
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*pos++ = base64_table[(in[1] & 0x0f) << 2];
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}
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*pos++ = ch; /* *pos++ = '='; */
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/* line_len += 4; */
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}
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#if 0
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if (line_len)
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{
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*pos++ = '\n';
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}
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#endif
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*pos = '\0';
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if (out_len)
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{
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*out_len = pos - out;
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}
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/*out[*out_len] = '\0'; */
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return out;
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}
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/****************************************************************************
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* Name: _base64_decode
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*
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* Description:
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* Base64 decode
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*
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* Caller is responsible for freeing the returned buffer.
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*
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* Input Parameters:
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* src: Data to be decoded
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* len: Length of the data to be decoded
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* out_len: Pointer to output length variable
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*
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* Returned Value:
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* Returns: Allocated buffer of out_len bytes of decoded data,
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* or NULL on failure
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*
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****************************************************************************/
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static unsigned char *_base64_decode(const unsigned char *src, size_t len,
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unsigned char *dst, size_t * out_len,
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bool websafe)
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{
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unsigned char dtable[256];
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unsigned char *out;
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unsigned char *pos;
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unsigned char in[4];
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unsigned char block[4];
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unsigned char tmp;
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size_t count;
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size_t i;
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unsigned char base64_table[64];
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char ch = '=';
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if (websafe)
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{
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ch = '.';
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}
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base64_tab(base64_table, sizeof(base64_table), websafe);
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memset(dtable, 0x80, 256);
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for (i = 0; i < sizeof(base64_table); i++)
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{
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dtable[base64_table[i]] = i;
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}
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dtable[(int)ch] = 0; /* dtable['='] = 0; */
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count = 0;
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for (i = 0; i < len; i++)
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{
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if (dtable[src[i]] != 0x80)
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{
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count++;
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}
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}
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if (count % 4)
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{
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return NULL;
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}
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if (dst)
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{
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pos = out = dst;
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}
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else
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{
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pos = out = malloc(count);
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if (out == NULL)
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{
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return NULL;
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}
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}
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count = 0;
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for (i = 0; i < len; i++)
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{
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tmp = dtable[src[i]];
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if (tmp == 0x80)
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{
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continue;
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}
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in[count] = src[i];
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block[count] = tmp;
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count++;
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if (count == 4)
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{
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*pos++ = (block[0] << 2) | (block[1] >> 4);
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*pos++ = (block[1] << 4) | (block[2] >> 2);
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*pos++ = (block[2] << 6) | block[3];
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count = 0;
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}
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}
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if (pos > out)
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{
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if (in[2] == ch) /* if (in[2] == '=') */
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{
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pos -= 2;
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}
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else if (in[3] == ch) /* else if (in[3] == '=') */
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{
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pos--;
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}
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}
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*out_len = pos - out;
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return out;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: base64_encode
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****************************************************************************/
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unsigned char *base64_encode(const unsigned char *src, size_t len,
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unsigned char *dst, size_t * out_len)
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{
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return _base64_encode(src, len, dst, out_len, false);
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}
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/****************************************************************************
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* Name: base64_decode
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****************************************************************************/
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unsigned char *base64_decode(const unsigned char *src, size_t len,
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unsigned char *dst, size_t * out_len)
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{
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return _base64_decode(src, len, dst, out_len, false);
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}
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/****************************************************************************
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* Name: base64w_encode
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****************************************************************************/
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unsigned char *base64w_encode(const unsigned char *src, size_t len,
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unsigned char *dst, size_t * out_len)
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{
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return _base64_encode(src, len, dst, out_len, true);
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}
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/****************************************************************************
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* Name: base64w_decode
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****************************************************************************/
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unsigned char *base64w_decode(const unsigned char *src, size_t len,
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unsigned char *dst, size_t * out_len)
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{
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return _base64_decode(src, len, dst, out_len, true);
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}
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#endif /* CONFIG_CODECS_BASE64 */
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