IniFile.cpp

/**
 * @file
 * @brief initialization file read and write API implementation
 * @author Deng Yangjun
 * @date 2007-12-9
 * @version 0.2
 * (C)2007 Midapex
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Modified by Xishan Sun 4-2011
 * Double float type read and write added
 *
 *
 */
//#include "stdafx.h"
#include <iostream>
#include <cstring>
#include "IniFile.h"
#include <fstream>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#define MAX_INI_FILE_SIZE 2048*32

IniFile::IniFile(const string & fileName)
{
	m_fileName = fileName;
}

IniFile::~IniFile(void)
{
}

const string & IniFile::getFileName() const
{
	return m_fileName;
}

void IniFile::setSection(const string &section)
{
	m_section = section;
}

bool IniFile::write(const string &key, const string & value) const
{
	return write_profile_string(m_section.c_str(), key.c_str(), value.c_str(), m_fileName.c_str()) == 1 ? true : false;
}

bool IniFile::write(const string &key, int value) const
{
	char tmp[64];
	sprintf(tmp, "%d", value);
	return write(key, tmp);
}

bool IniFile::write(const string &key, double value) const
{
	char tmp[64];
	sprintf(tmp, "%f", value);
	return write(key, tmp);
}

string IniFile::readStr(const string &key, const string &default_value) const
{
	char buf[4096];
	read_profile_string(m_section.c_str(), key.c_str(), buf, sizeof(buf), default_value.c_str(), m_fileName.c_str());
	return buf;
}

int IniFile::readInt(const string &key, int default_value) const
{
	return read_profile_int(m_section.c_str(), key.c_str(), default_value, m_fileName.c_str());
}

double IniFile::readDouble(const string &key, double default_value) const
{
	return read_profile_double(m_section.c_str(), key.c_str(), default_value, m_fileName.c_str());
}

const string &IniFile::getSection() const
{
	return m_section;
}

int IniFile::load_ini_file(const char *file, char *buf,int *file_size)
{
	FILE *in = NULL;
	int i = 0;
	*file_size = 0;

	assert(file != NULL);
	assert(buf != NULL);

	in = fopen(file, "r");
	if(NULL == in)
	{
		return 0;
	}

	buf[i] = fgetc(in);

	//load initialization file
	while(buf[i] != (char)EOF)
	{
		i++;
		assert(i < MAX_INI_FILE_SIZE); //file too big, you can redefine MAX_INI_FILE_SIZE to fit the big file
		buf[i] = fgetc(in);
	}

	buf[i]='\0';
	*file_size = i;

	fclose(in);
	return 1;
}

int IniFile::newline(char c)
{
	return ('\n' == c ||  '\r' == c )? 1 : 0;
}
int IniFile::end_of_string(char c)
{
	return '\0'==c? 1 : 0;
}
int IniFile::left_barce(char c)
{
	return '[' == c? 1 : 0;
}
int IniFile::right_brace(char c )
{
	return ']' == c? 1 : 0;
}
int IniFile::parse_file(const char *section, const char *key, const char *buf,int *sec_s,int *sec_e,
					  int *key_s,int *key_e, int *value_s, int *value_e)
{
	const char *p = buf;
	int i=0;

	assert(buf!=NULL);
	assert(section != NULL && strlen(section));
	assert(key != NULL && strlen(key));

	*sec_e = *sec_s = *key_e = *key_s = *value_s = *value_e = -1;

	while( !end_of_string(p[i]) ) {
		//find the section
		if( ( 0==i ||  newline(p[i-1]) ) && left_barce(p[i]) )
		{
			int section_start=i+1;

			//find the ']'
			do {
				i++;
			} while(!right_brace(p[i]) && !end_of_string(p[i]));

			//if( 0 == strncmp(p+section_start,section, i-section_start)) {
			if (i - section_start == strlen(section) && 0 == strncmp(p + section_start, section, strlen(section)))
			{
				int newline_start=0;

				i++;

				//Skip over space char after ']'
				while(isspace(p[i])) {
					i++;
				}

				//find the section
				*sec_s = section_start;
				*sec_e = i;

				while((!(newline(p[i-1]) && left_barce(p[i]))) && (!end_of_string(p[i])))
				{
					int j=0;
					//get a new line
					newline_start = i;

					while((!newline(p[i])) && (!end_of_string(p[i])))
					{
						i++;
					}

					//now i is equal to end of the line
					j = newline_start;

					if(';' != p[j]) //skip over comment
					{
						while((j < i) && (p[j] != '='))
						{
							j++;
							if('=' == p[j]) {
								//if(strncmp(key,p+newline_start,j-newline_start)==0)
								if ((j - newline_start == strlen(key)) && (strncmp(key, p + newline_start, strlen(key)) == 0))
								{
									//find the key ok
									*key_s = newline_start;
									*key_e = j - 1;

									*value_s = j + 1;
									*value_e = i;

									return 1;
								}
							}
						}
					}
					i++;
				}
			}
		}
		else
		{
			i++;
		}
	}
	return 0;
}

/**
*@brief read string in initialization file\n
* retrieves a string from the specified section in an initialization file
*@param section [in] name of the section containing the key name
*@param key [in] name of the key pairs to value
*@param value [in] pointer to the buffer that receives the retrieved string
*@param size [in] size of result's buffer
*@param default_value [in] default value of result
*@param file [in] path of the initialization file
*@return 1 : read success; \n 0 : read fail
*/
int IniFile::read_profile_string( const char *section, const char *key,char *value,
						int size, const char *default_value, const char *file)
{
	char buf[MAX_INI_FILE_SIZE]={0};
	int file_size;
	int sec_s, sec_e, key_s,key_e, value_s, value_e;

	//check parameters
	assert(section != NULL && strlen(section));
	assert(key != NULL && strlen(key));
	assert(value != NULL);
	assert(size > 0);
	assert(file !=NULL && strlen(key));

	if(!load_ini_file(file, buf, &file_size))
	{
		if(default_value != NULL)
		{
			strncpy(value, default_value, size);
		}
		return 0;
	}

	if(!parse_file(section, key, buf, &sec_s, &sec_e, &key_s, &key_e, &value_s, &value_e))
	{
		if(default_value != NULL)
		{
			strncpy(value, default_value, size);
		}
		return 0; //not find the key
	}
	else
	{
		int cpcount = value_e - value_s;

		if(size - 1 < cpcount)
		{
			cpcount = size - 1;
		}

		memset(value, 0, size);
		memcpy(value,buf + value_s, cpcount);
		value[cpcount] = '\0';

		return 1;
	}
}

/**
*@brief read int value in initialization file\n
* retrieves int value from the specified section in an initialization file
*@param section [in] name of the section containing the key name
*@param key [in] name of the key pairs to value
*@param default_value [in] default value of result
*@param file [in] path of the initialization file
*@return profile int value,if read fail, return default value
*/
int IniFile::read_profile_int(const char *section, const char *key,int default_value, const char *file)
{
	char value[32] = {0};
	if(!read_profile_string(section, key, value, sizeof(value), NULL, file))
	{
		return default_value;
	}
	else
	{
		return atoi(value);
	}
}

/**
*@brief read double float value in initialization file\n
* retrieves double float value from the specified section in an initialization file
*@param section [in] name of the section containing the key name
*@param key [in] name of the key pairs to value
*@param default_value [in] default value of result
*@param file [in] path of the initialization file
*@return profile int value, if read fail, return default value
*/
double IniFile::read_profile_double(const char *section, const char *key, double default_value, const char *file)
{
	char value[32] = {0};
	if(!read_profile_string(section,key, value, sizeof(value), NULL, file))
	{
		return default_value;
	}
	else
	{
		return atof(value);
	}
}

/**
* @brief write a profile string to a ini file
* @param section [in] name of the section,can't be NULL and empty string
* @param key [in] name of the key pairs to value, can't be NULL and empty string
* @param value [in] profile string value
* @param file [in] path of ini file
* @return 1 : success\n 0 : failure
*/
int IniFile::write_profile_string(const char *section, const char *key,
						 const char *value, const char *file)
{
	char buf[MAX_INI_FILE_SIZE]={0};
	char w_buf[MAX_INI_FILE_SIZE]={0};
	int sec_s, sec_e, key_s, key_e, value_s, value_e;
	int value_len = (int)strlen(value);
	int file_size;
	FILE *out;

	//check parameters
	assert(section != NULL && strlen(section));
	assert(key != NULL && strlen(key));
	assert(value != NULL);
	assert(file !=NULL && strlen(key));

	if(!load_ini_file(file,buf,&file_size))
	{
		sec_s = -1;
	}
	else
	{
		parse_file(section, key, buf, &sec_s, &sec_e, &key_s, &key_e, &value_s, &value_e);
	}

	if( -1 == sec_s)
	{
		if(0==file_size)
		{
			sprintf(w_buf + file_size, "[%s]\n%s=%s\n", section, key, value);
		}
		else
		{
			//not find the section, then add the new section at end of the file
			memcpy(w_buf, buf, file_size);
			sprintf(w_buf+file_size, "\n[%s]\n%s=%s\n", section, key, value);
		}
	}
	else if(-1 == key_s)
	{
		//not find the key, then add the new key=value at end of the section
		memcpy(w_buf, buf, sec_e);
		sprintf(w_buf + sec_e,"%s=%s\n", key,value);
		sprintf(w_buf + sec_e + strlen(key) + strlen(value) + 2, buf + sec_e, file_size - sec_e);
	}
	else
	{
		//update value with new value
		memcpy(w_buf, buf, value_s);
		memcpy(w_buf + value_s, value, value_len);
		memcpy(w_buf + value_s + value_len, buf + value_e, file_size - value_e);
	}

	out = fopen(file, "w");
	if(NULL == out)
	{
		return 0;
	}

	if(-1 == fputs(w_buf,out))
	{
		fclose(out);
		return 0;
	}

	fclose(out);
	return 1;
}