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utils.cpp
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utils.cpp
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///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2004-2010 by The Allacrost Project
// All Rights Reserved
//
// This code is licensed under the GNU GPL version 2. It is free software
// and you may modify it and/or redistribute it under the terms of this license.
// See http://www.gnu.org/copyleft/gpl.html for details.
///////////////////////////////////////////////////////////////////////////////
/** ****************************************************************************
*** \file utils.cpp
*** \author Tyler Olsen, roots@allacrost.org
*** \brief Source file for the utility code.
*** ***************************************************************************/
#include "utils.h"
// Headers included for directory manipulation. Windows has its own way of
// dealing with directories, hence the need for conditional includes
#ifdef _WIN32
#include <direct.h>
#include <shlobj.h>
#else
#include <dirent.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#endif
#include <SDL/SDL.h>
#include <fstream>
#include <sys/stat.h>
#include <iconv.h>
#include <cmath>
#include <stdexcept>
#include <algorithm>
namespace hoa_utils {
bool UTILS_DEBUG = false;
////////////////////////////////////////////////////////////////////////////////
///// Numeric utility functions
////////////////////////////////////////////////////////////////////////////////
uint32 RoundUpPow2(uint32 x) {
x -= 1;
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
return x + 1;
}
bool IsPowerOfTwo(uint32 x) {
return ((x & (x-1)) == 0);
}
bool IsOddNumber(uint32 x) {
// NOTE: this happens to work for both little and big endian systems
return (x & 0x00000001);
}
bool IsFloatInRange(float value, float lower, float upper) {
return (value >= lower && value <= upper);
}
bool IsFloatEqual(float value, float base, float delta) {
return (value >= (base - delta) && value <= (base + delta));
}
float GetFloatFraction(float value) {
return (value - GetFloatInteger(value));
}
float GetFloatInteger(float value) {
return static_cast<float>(static_cast<int>(value));
}
float FloorToFloatMultiple (const float value, const float multiple) {
return multiple * std::floor(value / multiple);
}
std::string Upcase(std::string text) {
std::transform(text.begin(), text.end(), text.begin(), ::toupper);
return text;
}
std::string UpcaseFirst(std::string text) {
std::transform(text.begin(), ++text.begin(), text.begin(), ::toupper);
return text;
}
////////////////////////////////////////////////////////////////////////////////
///// ustring Class
////////////////////////////////////////////////////////////////////////////////
const size_t ustring::npos = ~0;
ustring::ustring() {
_str.push_back(0);
}
ustring::ustring(const uint16 *s) {
_str.clear();
if (!s) {
_str.push_back(0);
return;
}
while (*s != 0) {
_str.push_back(*s);
++s;
}
_str.push_back(0);
}
// Return a substring starting at pos, continuing for n elements
ustring ustring::substr(size_t pos, size_t n) const
{
size_t len = length();
if (pos >= len)
throw std::out_of_range("pos passed to substr() was too large");
ustring s;
while (n > 0 && pos < len) {
s += _str[pos];
++pos;
--n;
}
return s;
}
// Concatenates string to another
ustring ustring::operator + (const ustring& s)
{
ustring temp = *this;
// nothing to do for empty string
if (s.empty())
return temp;
// add first character of string into the null character spot
temp._str[length()] = s[0];
// add rest of characters afterward
size_t len = s.length();
for (size_t j = 1; j < len; ++j) {
temp._str.push_back(s[j]);
}
// Finish off with a null character
temp._str.push_back(0);
return temp;
}
// Adds a character to end of this string
ustring & ustring::operator += (uint16 c) {
_str[length()] = c;
_str.push_back(0);
return *this;
}
// Concatenate another string on to the end of this string
ustring & ustring::operator += (const ustring &s) {
// nothing to do for empty string
if (s.empty())
return *this;
// add first character of string into the null character spot
_str[length()] = s[0];
// add rest of characters afterward
size_t len = s.length();
for (size_t j = 1; j < len; ++j) {
_str.push_back(s[j]);
}
// Finish off with a null character
_str.push_back(0);
return *this;
}
// Will assign the current string to this string
ustring & ustring::operator = (const ustring &s) {
clear();
operator += (s);
return *this;
} // ustring & ustring::operator = (const ustring &s)
// Finds a character within a string, starting at pos. If nothing is found, npos is returned
size_t ustring::find(uint16 c, size_t pos) const {
size_t len = length();
for (size_t j = pos; j < len; ++j) {
if (_str[j] == c)
return j;
}
return npos;
} // size_t ustring::find(uint16 c, size_t pos) const
// Finds a string within a string, starting at pos. If nothing is found, npos is returned
size_t ustring::find(const ustring &s, size_t pos) const {
size_t len = length();
size_t total_chars = s.length();
size_t chars_found = 0;
for (size_t j = pos; j < len; ++j) {
if (_str[j] == s[chars_found]) {
++chars_found;
if (chars_found == total_chars) {
return (j - chars_found + 1);
}
}
else {
chars_found = 0;
}
}
return npos;
} // size_t ustring::find(const ustring &s, size_t pos) const
////////////////////////////////////////////////////////////////////////////////
///// Exception class
////////////////////////////////////////////////////////////////////////////////
Exception::Exception(const std::string & message, const std::string & file, const int line, const std::string & function) throw() :
_message(message),
_file(file),
_line(line),
_function(function)
{}
Exception::~Exception() throw()
{}
std::string Exception::ToString() const throw() {
return std::string("EXCEPTION:" + _file + ":" + _function + ":" + NumberToString(_line) + ": " + _message);
}
std::string Exception::GetMessage() const throw() {
return _message;
}
std::string Exception::GetFile() const throw() {
return _file;
}
int Exception::GetLine() const throw() {
return _line;
}
std::string Exception::GetFunction() const throw() {
return _function;
}
////////////////////////////////////////////////////////////////////////////////
///// string and ustring manipulator functions
////////////////////////////////////////////////////////////////////////////////
// Returns true if the given text is a number
bool IsStringNumeric(const std::string& text) {
if (text.empty())
return false;
// Keep track of whether decimal point is allowed. It is allowed to be present in the text zero or one times only.
bool decimal_allowed = true;
size_t len = text.length();
// Check each character of the string one at a time
for (size_t c = 0; c < len; ++c) {
// The only non numeric characters allowed are a - or + as the first character, and one decimal point anywhere
bool numeric_char = (isdigit(static_cast<int32>(text[c]))) || (c==0 && (text[c] == '-' || text[c] == '+'));
if (!numeric_char) {
// Check if the 'bad' character is a decimal point first before labeling the string invalid
if (decimal_allowed && text[c] == '.') {
decimal_allowed = false; // Decimal points are now invalid for the rest of the string
}
else {
return false;
}
}
}
return true;
} // bool IsStringNumeric(const string& text)
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
#define UTF_16_ICONV_NAME "UTF-16LE"
#else
#define UTF_16_ICONV_NAME "UTF-16BE"
#endif
#define UTF_16_BOM_STD 0xFEFF
#define UTF_16_BOM_REV 0xFFFE
// Converts from UTF16 to UTF8, using iconv
bool UTF16ToUTF8(const uint16 *source, char *dest, size_t length) {
if (!length)
return true;
iconv_t convertor = iconv_open("UTF-8", UTF_16_ICONV_NAME);
if (convertor == (iconv_t) -1) {
return false;
}
const char *source_char = reinterpret_cast<const char *>(source);
#if (defined(_LIBICONV_VERSION) && _LIBICONV_VERSION == 0x0109)
// We are using an iconv API that uses const char*
const char *sourceChar = source_char;
#else
// The iconv API doesn't specify a const source for legacy support reasons.
// Versions after 0x0109 changed back to char* for POSIX reasons.
char *sourceChar = const_cast<char *>(source_char);
#endif
char *destChar = dest;
size_t sourceLen = length;
size_t destLen = length;
size_t ret = iconv(convertor, &sourceChar, &sourceLen,
&destChar, &destLen);
iconv_close(convertor);
if (ret == (size_t) -1) {
perror("iconv");
return false;
}
return true;
}
// Converts from UTF8 to UTF16, including the Byte Order Mark, using iconv
// Skip the first uint16 to skip the BOM.
bool UTF8ToUTF16(const char *source, uint16 *dest, size_t length) {
if (!length)
return true;
iconv_t convertor = iconv_open(UTF_16_ICONV_NAME, "UTF-8");
if (convertor == (iconv_t) -1) {
return false;
}
#if (defined(_LIBICONV_VERSION) && _LIBICONV_VERSION == 0x0109)
// We are using an iconv API that uses const char*
const char *sourceChar = source;
#else
// The iconv API doesn't specify a const source for legacy support reasons.
// Versions after 0x0109 changed back to char* for POSIX reasons.
char *sourceChar = const_cast<char *>(source);
#endif
char *destChar = reinterpret_cast<char *>(dest);
size_t sourceLen = length;
size_t destLen = (length + 1) * 2;
size_t ret = iconv(convertor, &sourceChar, &sourceLen,
&destChar, &destLen);
iconv_close(convertor);
if (ret == (size_t) -1) {
perror("iconv");
return false;
}
return true;
}
// Creates a ustring from a normal string
ustring MakeUnicodeString(const std::string& text) {
int32 length = static_cast<int32>(text.length() + 1);
uint16 *ubuff = new uint16[length + 1];
memset(ubuff, 0, 2*(length+1));
uint16 *utf16String = ubuff;
if (UTF8ToUTF16(text.c_str(), ubuff, length)) {
// Skip the "Byte Order Mark" from the UTF16 specification
if (utf16String[0] == UTF_16_BOM_STD || utf16String[0] == UTF_16_BOM_REV) {
utf16String = ubuff + 1;
}
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
// For some reason, using UTF-16BE to iconv on big-endian machines
// still does not create correctly accented characters, so this
// byte swapping must be performed (only for irregular characters,
// hence the mask).
for (int32 c = 0; c < length; c++)
if (utf16String[c] & 0xFF80)
utf16String[c] = (utf16String[c] << 8) | (utf16String[c] >> 8);
#endif
}
else {
for (int32 c = 0; c < length; ++c) {
ubuff[c] = static_cast<uint16>(text[c]);
}
}
ustring new_ustr(utf16String);
delete[] ubuff;
return new_ustr;
} // ustring MakeUnicodeString(const string& text)
// Creates a normal string from a ustring
std::string MakeStandardString(const ustring& text) {
int32 length = static_cast<int32>(text.length());
unsigned char *strbuff = new unsigned char[length+1];
strbuff[length] = '\0';
for (int32 c = 0; c < length; ++c) {
uint16 curr_char = text[c];
if(curr_char > 0xff)
strbuff[c] = '?';
else
strbuff[c] = static_cast<unsigned char>(curr_char);
}
std::string new_str(reinterpret_cast<char*>(strbuff));
delete [] strbuff;
return new_str;
} // string MakeStandardString(const ustring& text)
////////////////////////////////////////////////////////////////////////////////
///// Random number generator functions
////////////////////////////////////////////////////////////////////////////////
float RandomFloat() {
return (static_cast<float>(rand()) / static_cast<float>(RAND_MAX));
}
float RandomFloat(float a, float b) {
if (a > b) {
float c = a;
a = b;
b = c;
}
float r = static_cast<float>(rand() % 10001);
return a + (b - a) * r / 10000.0f;
}
// Returns a random integer between two inclusive bounds
int32 RandomBoundedInteger(int32 lower_bound, int32 upper_bound) {
int32 range; // The number of possible values we may return
float result;
range = upper_bound - lower_bound + 1;
if (range < 0) { // Oops, someone accidentally switched the lower/upper bound arguments
IF_PRINT_WARNING(UTILS_DEBUG) << "UTILS WARNING: Call to RandomNumber had bound arguments swapped." << std::endl;
range = range * -1;
}
result = range * RandomFloat();
result = result + lower_bound; // Shift result so that it is within the correct bounds
return static_cast<int32>(result);
} // int32 RandomBoundedInteger(int32 lower_bound, int32 upper_bound)
// Creates a Gaussian random interger value.
// std_dev and positive_value are optional arguments with default values 10.0f and true respectively
int32 GaussianRandomValue(int32 mean, float std_dev, bool positive_value) {
float x, y, r; // x and y are coordinates on the unit circle
float grv_unit; // Used to hold a Gaussian random variable on a normal distribution curve (mean 0, stand dev 1)
float result;
// Make sure that the standard deviation is positive
if (std_dev < 0) {
std::cerr << "UTILS WARNING: negative value for standard deviation argument in function GaussianValue" << std::endl;
std_dev = -1.0f * std_dev;
}
// Computes a standard Gaussian random number using the the polar form of the Box-Muller transformation.
// The algorithm computes a random point (x, y) inside the unit circle centered at (0, 0) with radius 1.
// Then a Gaussian random variable with mean 0 and standard deviation 1 is computed by:
//
// x * sqrt(-2.0 * log(r) / r)
//
// Reference: Knuth, The Art of Computer Programming, Volume 2, p. 122
// This loop is executed 4 / pi = 1.273 times on average
do {
x = 2.0f * RandomFloat() - 1.0f; // Get a random x-coordinate [-1.0f, 1.0f]
y = 2.0f * RandomFloat() - 1.0f; // Get a random y-coordinate [-1.0f, 1.0f]
r = x*x + y*y;
} while (r > 1.0f || r == 0.0f);
grv_unit = x * sqrt(-2.0f * log(r) / r);
// Use the standard gaussian value to create a random number with the desired mean and standard deviation.
result = (grv_unit * std_dev) + mean;
// Return zero if a negative result was found and only positive values were to be returned
if (result < 0.0f && positive_value)
return 0;
else
return static_cast<int32>(result);
} // int32 GaussianValue(int32 mean, float std_dev, bool positive_value)
// Returns true/false depending on the chance
bool Probability(uint32 chance) {
uint32 value = static_cast<uint32>(RandomBoundedInteger(1, 100));
if (value <= chance)
return true;
else
return false;
}
////////////////////////////////////////////////////////////////////////////////
///// Directory manipulation functions
////////////////////////////////////////////////////////////////////////////////
bool DoesFileExist(const std::string& file_name) {
// Modified to use platform specific code because on windows stat does not work on directories,
// but on POSIX compliant systems it does, and GetFileAttributes works for both folders and
// directories on win32
#ifdef _WIN32
return GetFileAttributes(file_name.c_str()) != INVALID_FILE_ATTRIBUTES;
#else
struct stat buf;
if (stat(file_name.c_str(), &buf) == 0)
return true;
else
return false;
#endif
}
bool MoveFile(const std::string& source_name, const std::string& destination_name) {
if (DoesFileExist(destination_name))
remove(destination_name.c_str());
return (rename(source_name.c_str(), destination_name.c_str()) == 0);
}
void CopyFile(const std::string& source, const std::string& destination) {
if (DoesFileExist(destination))
remove(destination.c_str());
std::ifstream src(source.c_str());
std::ofstream dst(destination.c_str());
dst << src.rdbuf();
}
bool MakeDirectory(const std::string& dir_name) {
// Don't do anything if the directory already exists
struct stat buf;
int32 i = stat(dir_name.c_str(), &buf);
if (i == 0)
return true;
// Create the directory with mkdir(). Note that Windows does not require file permissions to be set, but
// all other operating systems do.
#ifdef _WIN32
int32 success = mkdir(dir_name.c_str());
#else
int32 success = mkdir(dir_name.c_str(), S_IRWXG | S_IRWXO | S_IRWXU);
#endif
if (success == -1) {
std::cerr << "UTILS ERROR: could not create directory: " << dir_name.c_str() << std::endl;
return false;
}
return true;
}
bool CleanDirectory(const std::string& dir_name) {
// Don't do anything if the directory doesn't exist
struct stat buf;
int32 i = stat(dir_name.c_str(), &buf);
if (i != 0)
return true;
#ifdef _WIN32
//--- WINDOWS --------------------------------------------------------------
// Get the current directory that the application resides in
char app_path[1024];
GetCurrentDirectoryA(1024, app_path);
int32 app_path_len = static_cast<int32>(strlen(app_path));
if (app_path_len <= 0)
return false;
if(app_path[app_path_len-1] == '\\') // Remove the ending slash if one is there
app_path[app_path_len-1] = '\0';
std::string full_path = app_path;
if (dir_name[0] == '/' || dir_name[0] == '\\') {
full_path += dir_name;
}
else {
full_path += "\\";
full_path += dir_name;
}
char file_found[1024];
WIN32_FIND_DATAA info;
HANDLE hp;
sprintf(file_found, "%s\\*.*", full_path.c_str());
hp = FindFirstFileA(file_found, &info);
if (hp != INVALID_HANDLE_VALUE) {
// Remove each file from the full_path directory
do {
sprintf(file_found, "%s\\%s", full_path.c_str(), info.cFileName);
DeleteFileA(file_found);
} while(FindNextFileA(hp, &info));
}
FindClose(hp);
#else
//--- NOT WINDOWS ----------------------------------------------------------
DIR *parent_dir;
struct dirent *dir_file;
parent_dir = opendir(dir_name.c_str()); // open the directory we want to clean
if (!parent_dir) {
std::cerr << "UTILS ERROR: failed to clean directory: " << dir_name << std::endl;
return false;
}
std::string base_dir = dir_name;
if (base_dir[base_dir.length()-1] != '/')
base_dir += "/";
// Remove each file found in the parent directory
while ((dir_file = readdir(parent_dir))) {
std::string file_name = base_dir + dir_file->d_name;
remove(file_name.c_str());
}
closedir(parent_dir);
#endif
return true;
}
bool RemoveDirectory(const std::string& dir_name) {
// Don't do anything if the directory doesn't exist
struct stat buf;
int32 i = stat(dir_name.c_str(), &buf);
if (i != 0)
return true;
// Remove any files that still reside in the directory
CleanDirectory(dir_name);
// Finally, remove the folder itself with rmdir()
int32 success = rmdir(dir_name.c_str());
if (success == -1) {
std::cerr << "UTILS ERROR: could not delete directory: " << dir_name << std::endl;
return false;
}
return true;
}
std::vector<std::string> ListDirectory(const std::string& dir_name, const std::string& filter) {
//create our vector
std::vector<std::string> directoryList;
//Don't try to list if the directory does not exist
struct stat buf;
int32 i = stat(dir_name.c_str(), &buf);
if (i != 0)
return directoryList;
//directory exists so lets list
#if defined _WIN32
//Windows platform
// Get the current directory that the application resides in
char app_path[1024];
GetCurrentDirectoryA(1024, app_path);
int32 app_path_len = static_cast<int32>(strlen(app_path));
if (app_path_len <= 0)
return directoryList;
if(app_path[app_path_len-1] == '\\') // Remove the ending slash if one is there
app_path[app_path_len-1] = '\0';
std::string full_path = app_path;
if (dir_name[0] == '/' || dir_name[0] == '\\') {
full_path += dir_name;
}
else {
full_path += "\\";
full_path += dir_name;
}
char file_found[1024];
WIN32_FIND_DATAA info;
HANDLE hp;
sprintf(file_found, "%s\\*.*", full_path.c_str());
hp = FindFirstFileA(file_found, &info);
if (hp != INVALID_HANDLE_VALUE) {
// List each file from the full_path directory
do {
std::string fileName(file_found);
if(filter == "")
directoryList.push_back(file_found);
else if(fileName.find(filter) != std::string::npos)
directoryList.push_back(file_found);
} while(FindNextFileA(hp, &info));
}
FindClose(hp);
#else
//Not Windows
DIR *dir;
struct dirent *dir_file;
dir = opendir(dir_name.c_str()); //open the directory for listing
if(!dir) {
std::cerr << "UTILS ERROR: Failed to list directory: " << dir_name << std::endl;
return directoryList;
}
//List each file found in the directory as long as it end with .lua
while ((dir_file = readdir(dir))) {
std::string fileName = dir_file->d_name;
//contains a .lua ending so put it in the directory
if(filter == "")
directoryList.push_back(dir_file->d_name);
else if(fileName.find(filter) != std::string::npos)
directoryList.push_back(dir_file->d_name);
}
closedir(dir);
#endif
return directoryList;
}
bool DeleteFile(const std::string &filename) {
if(DoesFileExist(filename.c_str())) {
remove(filename.c_str());
if(!DoesFileExist(filename.c_str()))
return true;
}
return false;
}
#if defined __MACH__
const std::string GetUserDataPath(bool user_files) {
#else
const std::string GetUserDataPath(bool /*user_files*/) {
#endif
#if defined _WIN32
TCHAR path[MAX_PATH];
if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, path))) {
std::string user_path = std::string(path) + "/"APPUPCASEDIRNAME"/";
if (DoesFileExist(user_path) == false)
MakeDirectory(user_path);
return user_path;
}
#elif defined __MACH__
passwd *pw = getpwuid(getuid());
if (pw) {
std::string path = "";
if (user_files)
path = std::string(pw->pw_dir) + "/Library/Application Support/"APPUPCASEDIRNAME"/";
else
path = std::string(pw->pw_dir) + "/Library/Preferences/"APPUPCASEDIRNAME"/";
if (DoesFileExist(path) == false)
MakeDirectory(path);
return path;
}
#else // Linux, BSD, other POSIX systems
passwd *pw = getpwuid(getuid());
if (pw) {
std::string path = std::string(pw->pw_dir) + "/."APPSHORTNAME"/";
if (DoesFileExist(path) == false)
MakeDirectory(path);
return path;
}
#endif
// Default path if a specific solution could not be found. Note that this path may
// not be writable by the user since it could be installed in administrator/root space
PRINT_WARNING << "could not idenfity user path, defaulting to system path" << std::endl;
return "dat/";
}
const std::string GetSettingsFilename() {
std::string settings_file = GetUserDataPath(false) + "/settings.lua";
if (!DoesFileExist(settings_file)) {
settings_file = "dat/config/settings.lua";
if (!DoesFileExist(settings_file))
PRINT_WARNING << "settings.lua file not found." << std::endl;
}
return settings_file;
}
} // namespace utils