author | alfadur |
Fri, 04 Oct 2019 23:23:35 +0300 | |
changeset 15441 | 61a0bd0bb021 |
parent 14435 | a1613788130d |
permissions | -rw-r--r-- |
14435
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use std::ffi::{ CString, CStr, OsStr }; |
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use std::io::Result; |
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use std::sync::{ Mutex }; |
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use libc::{ c_int, c_char }; |
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/// Keep track of the number of global contexts. |
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static mut NUM_CONTEXTS: usize = 0; |
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/// Utility |
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mod util; |
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/// File operations |
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pub mod file; |
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#[link(name = "physfs")] |
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extern { |
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// nonzero on success, zero on error. |
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fn PHYSFS_init(arg0: *const c_char) -> c_int; |
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// nonzero if initialized, zero if not. |
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fn PHYSFS_isInit() -> c_int; |
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// nonzero if success, zero if error. |
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fn PHYSFS_deinit() -> c_int; |
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// string if success, NULL if error. |
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fn PHYSFS_getLastError() -> *const c_char; |
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// nonzero if success, zero if error |
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fn PHYSFS_mount(new_dir: *const c_char, mount_point: *const c_char, append_to_path: c_int) -> c_int; |
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// nonzero if success, zero if error. |
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fn PHYSFS_setWriteDir(write_dir: *const c_char) -> c_int; |
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// nonzero on success, zero on error. |
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fn PHYSFS_mkdir(dir_name: *const c_char) -> c_int; |
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// Checks if a given path exists; returns nonzero if true |
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fn PHYSFS_exists(path: *const c_char) -> c_int; |
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// Checks if a given path is a directory; returns nonzero if true |
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fn PHYSFS_isDirectory(path: *const c_char) -> c_int; |
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} |
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/// The access point for PhysFS function calls. |
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pub struct PhysFSContext; |
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unsafe impl Send for PhysFSContext {} |
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impl PhysFSContext { |
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/// Creates a new PhysFS context. |
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pub fn new() -> Result<Self> { |
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let con = PhysFSContext; |
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match PhysFSContext::init() { |
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Err(e) => Err(e), |
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_ => { |
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// Everything's gone right so far |
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// now, increment the instance counter |
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println!("Inc"); |
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unsafe { |
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NUM_CONTEXTS += 1; |
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} |
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// and return the newly created context |
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Ok(con) |
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} |
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} |
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} |
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/// initializes the PhysFS library. |
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fn init() -> Result<()> { |
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// Initializing multiple times throws an error. So let's not! |
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if PhysFSContext::is_init() { return Ok(()); } |
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let mut args = ::std::env::args(); |
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let default_arg0 = "".to_string(); |
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let arg0 = args.next().unwrap_or(default_arg0); |
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let c_arg0 = try!(CString::new(arg0)); |
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let ret = unsafe { PHYSFS_init(c_arg0.as_ptr()) }; |
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match ret { |
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0 => Err(util::physfs_error_as_io_error()), |
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_ => Ok(()) |
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} |
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} |
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/// Checks if PhysFS is initialized |
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pub fn is_init() -> bool { |
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unsafe { PHYSFS_isInit() != 0 } |
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} |
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/// De-initializes PhysFS. It is recommended to close |
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/// all file handles manually before calling this. |
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fn de_init() { |
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// de_init'ing more than once can cause a double-free -- do not want. |
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if !PhysFSContext::is_init() { return } |
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unsafe { |
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PHYSFS_deinit(); |
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} |
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} |
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/// Adds an archive or directory to the search path. |
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/// mount_point is the location in the tree to mount it to. |
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pub fn mount<P>(&self, new_dir: P, mount_point: String, append_to_path: bool) -> Result<()> |
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where P: AsRef<OsStr> |
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{ |
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let c_new_dir = CString::new(new_dir.as_ref().to_string_lossy().as_bytes()).unwrap(); |
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let c_mount_point = try!(CString::new(mount_point)); |
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match unsafe { |
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99 |
PHYSFS_mount( |
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c_new_dir.as_c_str().as_ptr(), |
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c_mount_point.as_ptr(), |
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append_to_path as c_int |
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) |
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} { |
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0 => Err(util::physfs_error_as_io_error()), |
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_ => Ok(()) |
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107 |
} |
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108 |
} |
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109 |
|
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110 |
/// Gets the last error message in a human-readable format |
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111 |
/// This message may be localized, so do not expect it to |
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/// match a specific string of characters. |
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113 |
pub fn get_last_error() -> String { |
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let ptr: *const c_char = unsafe { |
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PHYSFS_getLastError() |
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}; |
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117 |
if ptr.is_null() { |
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return "".to_string() |
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119 |
} |
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120 |
|
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121 |
let buf = unsafe { CStr::from_ptr(ptr).to_bytes().to_vec() }; |
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122 |
|
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123 |
String::from_utf8(buf).unwrap() |
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124 |
} |
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125 |
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/// Sets a new write directory. |
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/// This method will fail if the current write dir |
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128 |
/// still has open files in it. |
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129 |
pub fn set_write_dir<P>(&self, write_dir: P) -> Result<()> |
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130 |
where P: AsRef<OsStr> |
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131 |
{ |
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132 |
let write_dir = CStr::from_bytes_with_nul(write_dir.as_ref().to_str().unwrap().as_bytes()).unwrap(); |
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133 |
let ret = unsafe { |
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134 |
PHYSFS_setWriteDir(write_dir.as_ptr()) |
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135 |
}; |
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136 |
|
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137 |
match ret { |
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138 |
0 => Err(util::physfs_error_as_io_error()), |
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139 |
_ => Ok(()) |
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140 |
} |
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141 |
} |
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142 |
|
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143 |
/// Creates a new dir relative to the write_dir. |
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144 |
pub fn mkdir(&self, dir_name: &str) -> Result<()> { |
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145 |
let c_dir_name = try!(CString::new(dir_name)); |
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146 |
let ret = unsafe { |
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147 |
PHYSFS_mkdir(c_dir_name.as_ptr()) |
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148 |
}; |
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149 |
|
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150 |
match ret { |
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151 |
0 => Err(util::physfs_error_as_io_error()), |
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152 |
_ => Ok(()) |
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153 |
} |
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154 |
} |
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155 |
|
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156 |
/// Checks if given path exists |
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157 |
pub fn exists(&self, path: &str) -> Result<()> { |
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158 |
let c_path = try!(CString::new(path)); |
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159 |
let ret = unsafe { PHYSFS_exists(c_path.as_ptr()) }; |
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160 |
|
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161 |
match ret { |
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162 |
0 => Err(util::physfs_error_as_io_error()), |
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163 |
_ => Ok(()) |
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164 |
} |
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165 |
} |
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166 |
|
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167 |
/// Checks if given path is a directory |
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168 |
pub fn is_directory(&self, path: &str) -> Result<()> { |
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169 |
let c_path = try!(CString::new(path)); |
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170 |
let ret = unsafe { PHYSFS_isDirectory(c_path.as_ptr()) }; |
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|
171 |
|
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172 |
match ret { |
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173 |
0 => Err(util::physfs_error_as_io_error()), |
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|
174 |
_ => Ok(()) |
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175 |
} |
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176 |
} |
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|
177 |
} |
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|
178 |
|
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179 |
impl Drop for PhysFSContext { |
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180 |
fn drop(&mut self) { |
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181 |
// decrement NUM_CONTEXTS |
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182 |
unsafe { |
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|
183 |
NUM_CONTEXTS -= 1; |
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184 |
} |
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185 |
// and de_init if there aren't any contexts left. |
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186 |
if unsafe { NUM_CONTEXTS == 0 } { |
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187 |
PhysFSContext::de_init(); |
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188 |
} |
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189 |
} |
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190 |
} |