REminiscence/fs.cpp

176 lines
3.7 KiB
C++

/*
* REminiscence - Flashback interpreter
* Copyright (C) 2005-2019 Gregory Montoir (cyx@users.sourceforge.net)
*/
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <dirent.h>
#include <sys/stat.h>
#include <sys/param.h>
#endif
#ifdef USE_RWOPS
#include <SDL_rwops.h>
#endif
#include "fs.h"
#include "util.h"
struct FileName {
char *name;
int dir;
};
struct FileSystem_impl {
char **_dirsList;
int _dirsCount;
FileName *_filesList;
int _filesCount;
FileSystem_impl() :
_dirsList(0), _dirsCount(0), _filesList(0), _filesCount(0) {
}
~FileSystem_impl() {
for (int i = 0; i < _dirsCount; ++i) {
free(_dirsList[i]);
}
free(_dirsList);
for (int i = 0; i < _filesCount; ++i) {
free(_filesList[i].name);
}
free(_filesList);
}
void setRootDirectory(const char *dir) {
getPathListFromDirectory(dir);
debug(DBG_FILE, "Found %d files and %d directories", _filesCount, _dirsCount);
}
int findPathIndex(const char *name) const {
for (int i = 0; i < _filesCount; ++i) {
if (strcasecmp(_filesList[i].name, name) == 0) {
return i;
}
}
return -1;
}
char *getPath(const char *name) const {
const int i = findPathIndex(name);
if (i >= 0) {
const char *dir = _dirsList[_filesList[i].dir];
const int len = strlen(dir) + 1 + strlen(_filesList[i].name) + 1;
char *p = (char *)malloc(len);
if (p) {
snprintf(p, len, "%s/%s", dir, _filesList[i].name);
}
return p;
}
return 0;
}
void addPath(const char *dir, const char *name) {
int index = -1;
for (int i = 0; i < _dirsCount; ++i) {
if (strcmp(_dirsList[i], dir) == 0) {
index = i;
break;
}
}
if (index == -1) {
_dirsList = (char **)realloc(_dirsList, (_dirsCount + 1) * sizeof(char *));
if (_dirsList) {
_dirsList[_dirsCount] = strdup(dir);
index = _dirsCount;
++_dirsCount;
}
}
_filesList = (FileName *)realloc(_filesList, (_filesCount + 1) * sizeof(FileName));
if (_filesList) {
_filesList[_filesCount].name = strdup(name);
_filesList[_filesCount].dir = index;
++_filesCount;
}
}
void getPathListFromDirectory(const char *dir);
};
#ifdef _WIN32
void FileSystem_impl::getPathListFromDirectory(const char *dir) {
WIN32_FIND_DATA findData;
char searchPath[MAX_PATH];
snprintf(searchPath, sizeof(searchPath), "%s/*", dir);
HANDLE h = FindFirstFile(searchPath, &findData);
if (h) {
do {
if (findData.cFileName[0] == '.') {
continue;
}
char filePath[MAX_PATH];
snprintf(filePath, sizeof(filePath), "%s/%s", dir, findData.cFileName);
if (findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
getPathListFromDirectory(filePath);
} else {
addPath(dir, findData.cFileName);
}
} while (FindNextFile(h, &findData));
FindClose(h);
}
}
#else
void FileSystem_impl::getPathListFromDirectory(const char *dir) {
DIR *d = opendir(dir);
if (d) {
dirent *de;
while ((de = readdir(d)) != NULL) {
if (de->d_name[0] == '.') {
continue;
}
char filePath[MAXPATHLEN];
snprintf(filePath, sizeof(filePath), "%s/%s", dir, de->d_name);
struct stat st;
if (stat(filePath, &st) == 0) {
if (S_ISDIR(st.st_mode)) {
getPathListFromDirectory(filePath);
} else {
addPath(dir, de->d_name);
}
}
}
closedir(d);
}
}
#endif
FileSystem::FileSystem(const char *dataPath) {
_impl = new FileSystem_impl;
_impl->setRootDirectory(dataPath);
}
FileSystem::~FileSystem() {
delete _impl;
}
char *FileSystem::findPath(const char *filename) const {
return _impl->getPath(filename);
}
bool FileSystem::exists(const char *filename) const {
if (_impl->findPathIndex(filename) >= 0) {
return true;
}
#ifdef USE_RWOPS
SDL_RWops *rw = SDL_RWFromFile(filename, "rb");
if (rw) {
SDL_RWclose(rw);
return true;
}
#endif
return false;
}