153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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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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* 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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* This file is part of the Contiki operating system.
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*
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* $Id: shell-base64.c,v 1.1 2010/02/03 20:37:29 adamdunkels Exp $
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*/
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/**
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* \file
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* Base64-related shell commands
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki.h"
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#include "shell.h"
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#include <ctype.h>
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#include <stdio.h>
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#ifndef HAVE_SNPRINTF
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int snprintf(char *str, size_t size, const char *format, ...);
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#endif /* HAVE_SNPRINTF */
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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PROCESS(shell_dec64_process, "dec64");
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SHELL_COMMAND(dec64_command,
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"dec64",
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"dec64: decode base64 input",
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&shell_dec64_process);
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/*---------------------------------------------------------------------------*/
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#define BASE64_MAX_LINELEN 76
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struct base64_decoder_state {
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uint8_t data[3 * BASE64_MAX_LINELEN / 4];
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int dataptr;
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unsigned long tmpdata;
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int sextets;
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int padding;
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};
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/*---------------------------------------------------------------------------*/
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static int
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base64_decode_char(char c)
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{
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if(c >= 'A' && c <= 'Z') {
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return c - 'A';
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} else if(c >= 'a' && c <= 'z') {
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return c - 'a' + 26;
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} else if(c >= '0' && c <= '9') {
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return c - '0' + 52;
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} else if(c == '+') {
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return 62;
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} else if(c == '/') {
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return 63;
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} else {
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return 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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base64_add_char(struct base64_decoder_state *s, char c)
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{
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if(isspace(c)) {
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return 0;
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}
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if(s->dataptr >= sizeof(s->data)) {
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return 0;
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}
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if(c == '=') {
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++s->padding;
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}
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s->tmpdata = (s->tmpdata << 6) | base64_decode_char(c);
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++s->sextets;
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if(s->sextets == 4) {
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s->sextets = 0;
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s->data[s->dataptr] = (uint8_t)(s->tmpdata >> 16);
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s->data[s->dataptr + 1] = (uint8_t)(s->tmpdata >> 8);
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s->data[s->dataptr + 2] = (uint8_t)(s->tmpdata);
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s->dataptr += 3;
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if(s->dataptr == sizeof(s->data)) {
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return 0;
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} else {
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return 1;
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}
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(shell_dec64_process, ev, data)
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{
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PROCESS_BEGIN();
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while(1) {
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struct shell_input *input;
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struct base64_decoder_state s;
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int i;
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PROCESS_WAIT_EVENT_UNTIL(ev == shell_event_input);
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input = data;
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if(input->len1 + input->len2 == 0) {
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PROCESS_EXIT();
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}
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s.sextets = s.dataptr = s.padding = 0;
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for(i = 0; i < input->len1; ++i) {
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base64_add_char(&s, input->data1[i]);
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}
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for(i = 0; i < input->len2; ++i) {
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base64_add_char(&s, input->data2[i]);
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}
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shell_output(&dec64_command, s.data, s.dataptr - s.padding, "", 0);
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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void
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shell_base64_init(void)
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{
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shell_register_command(&dec64_command);
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}
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/*---------------------------------------------------------------------------*/
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