node_base64decode.cpp
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/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* CC/LICENSE
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "node_base64decode.h"
NodeBase64Decode::NodeBase64Decode(const uint32_t id, const string& name,
const string& type, const string& desc, const key_map_t& keymap)
: NodeBase(id, name, type, desc, keymap) {
}
NodeBase64Decode::~NodeBase64Decode(void) {
}
//////////////////////////////////////////////////////////////////////////////////////////
//Base64 解码
char getbase64value(char ch) //得到编码值
{
if ((ch >= 'A') && (ch <= 'Z')){ // A ~ Z
return ch - 'A';
}
if ((ch >= 'a') && (ch <= 'z')){ // a ~ z
return ch - 'a' + 26;
}
if ((ch >= '0') && (ch <= '9')){ // 0 ~ 9
return ch - '0' + 52;
}
switch (ch) // 其它字符
{
case '+':
return 62;
case '/':
return 63;
case '=': //Base64 填充字符
return 0;
default:
return 0;
}
}
// 解码函数
int32_t base64decode(std::string& OrgString, std::string& Base64String, int Base64StringLen, bool bForceDecode) //解码函数
{
OrgString = "";
if (Base64StringLen % 4 && !bForceDecode) //如果不是 4 的倍数,则 Base64 编码有问题
{
return -1;
}
unsigned char base64encode[4];
char *p = new (std::nothrow)char[3];
int32_t orgstringlen = 0;
int32_t cur = 0;
while (Base64StringLen > 3) //当待解码个数不足3个时,将忽略它(强制解码时有效)
{
base64encode[0] = getbase64value(Base64String.at(cur));
base64encode[1] = getbase64value(Base64String.at(cur + 1));
base64encode[2] = getbase64value(Base64String.at(cur + 2));
base64encode[3] = getbase64value(Base64String.at(cur + 3));
*p = (base64encode[0] << 2) | (base64encode[1] >> 4);
*(p + 1) = (base64encode[1] << 4) | (base64encode[2] >> 2);
*(p + 2) = (base64encode[2] << 6) | (base64encode[3]);
cur += 4;
Base64StringLen -= 4;
orgstringlen += 3;
OrgString = OrgString + std::string(p).substr(0, 3);//delete "\0"
}
delete[] p;
p = NULL;
return orgstringlen;
}
NodeBase* NodeBase64Decode::run(base_script_t* param) {
const char* exit = EXIT_FAIL;
std::string ret = "";
std::string tmp = "";
IVR_TRACE("%s", enter(param->name_var_map).c_str());
map<string, variable_t>::iterator it = param->name_var_map.find(_result);
if (it == param->name_var_map.end()) {
IVR_WARN("未找到返回值变量");
} else {
if (parse_expression(_input, param->name_var_map, ret)) {
if (STRING != it->second.type) {
IVR_WARN("变量%s 的类型不能解码", _result.c_str());
} else {
if (base64decode(tmp, ret, ret.length(), true) > 0){
*(string*)it->second.pvalue = tmp;
exit = EXIT_SUCC;
}
else{
exit = EXIT_FAIL;
}
}
} else {
IVR_WARN("parse assign expression failed(%s)", _input.c_str());
}
}
IVR_TRACE("%s exit from %s(%s)",
leave(param->name_var_map).c_str(), exit, tmp.c_str());
return _exit_node_map[exit];
}
bool NodeBase64Decode::load_other() {
return NodeBase::load_other()
&& valid_str(_key_map, _s_param_input, _input, false)
&& valid_str(_key_map, _s_param_result, _result);
}
const char* NodeBase64Decode::_s_param_input = "input";
const char* NodeBase64Decode::_s_param_result = "result";
std::string NodeBase64Decode::enter(const map<string, variable_t>& vars)const {
ostringstream ostm;
ostm << NodeBase::enter(vars);
ostm << "input:" << _input << ",result:" << _result;
return ostm.str();
}
std::string NodeBase64Decode::leave(const map<string, variable_t>& vars)const {
ostringstream ostm;
ostm << NodeBase::leave(vars);
ostm << "result:" << _result;
return ostm.str();
}