2 Copyright (c) 2004-2009, John Hurst
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
8 1. Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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29 \brief portable file i/o
44 # include <sys/types.h>
60 struct _finddatai64_t m_FileInfo;
66 ~DirScanner() { Close(); }
68 Result_t Open(const char*);
70 Result_t GetNext(char*);
74 typedef __int64 fsize_t;
75 typedef __int64 fpos_t;
76 typedef HANDLE FileHandle;
79 SP_BEGIN = FILE_BEGIN,
80 SP_POS = FILE_CURRENT,
84 typedef off_t fsize_t;
86 typedef int FileHandle;
87 const FileHandle INVALID_HANDLE_VALUE = -1L;
97 #ifndef KM_SMALL_FILES_OK
98 template <bool sizecheck> void compile_time_size_checker();
99 template <> inline void compile_time_size_checker<false>() {}
101 // READ THIS if your compiler is complaining about a previously declared implementation of
102 // compile_time_size_checker(). For example, GCC 4.0.1 looks like this:
104 // error: 'void Kumu::compile_time_size_checker() [with bool sizecheck = false]' previously declared here
106 // This is happening because the equality being tested below is false. The reason for this
107 // will depend on your OS, but on Linux it is probably because you have not used -D_FILE_OFFSET_BITS=64
108 // Adding this magic macro to your CFLAGS will get you going again. If you are on a system that
109 // does not support 64-bit files, you can disable this check by using -DKM_SMALL_FILES_OK. You
110 // will then of course be limited to file sizes < 4GB.
112 template <> inline void compile_time_size_checker<sizeof(Kumu::fsize_t)==sizeof(ui64_t)>() {}
116 const ui32_t Kilobyte = 1024;
117 const ui32_t Megabyte = Kilobyte * Kilobyte;
118 const ui32_t Gigabyte = Megabyte * Kilobyte;
120 const ui32_t MaxFilePath = Kilobyte;
123 //------------------------------------------------------------------------------------------
125 //------------------------------------------------------------------------------------------
128 typedef std::list<std::string> PathCompList_t; // a list of path components
129 typedef std::list<std::string> PathList_t; // a list of paths
132 bool PathExists(const std::string& Path); // true if the path exists in the filesystem
133 bool PathIsFile(const std::string& Path); // true if the path exists in the filesystem and is a file
134 bool PathIsDirectory(const std::string& Path); // true if the path exists in the filesystem and is a directory
135 fsize_t FileSize(const std::string& Path); // returns the size of a regular file, 0 for a directory or device
136 std::string PathCwd();
137 bool PathsAreEquivalent(const std::string& lhs, const std::string& rhs); // true if paths point to the same filesystem entry
139 // Returns free space and total space available for the given path
140 Result_t FreeSpaceForPath(const std::string& path, Kumu::fsize_t& free_space, Kumu::fsize_t& total_space);
142 // split and reassemble paths as lists of path components
143 PathCompList_t& PathToComponents(const std::string& Path, PathCompList_t& CList, char separator = '/'); // removes '//'
144 std::string ComponentsToPath(const PathCompList_t& CList, char separator = '/');
145 std::string ComponentsToAbsolutePath(const PathCompList_t& CList, char separator = '/'); // add separator to the front
146 bool PathHasComponents(const std::string& Path, char separator = '/'); // true if paths starts with separator
148 bool PathIsAbsolute(const std::string& Path, char separator = '/'); // true if path begins with separator
149 std::string PathMakeAbsolute(const std::string& Path, char separator = '/'); // compute position of relative path using getcwd()
150 std::string PathMakeLocal(const std::string& Path, const std::string& Parent); // remove Parent from front of Path, if it exists
151 std::string PathMakeCanonical(const std::string& Path, char separator = '/'); // remove '.' and '..'
152 bool PathResolveLinks(const std::string& link_path, std::string& resolved_path, char separator = '/');
155 std::string PathBasename(const std::string& Path, char separator = '/'); // returns right-most path element (list back())
156 std::string PathDirname(const std::string& Path, char separator = '/'); // returns everything but the right-most element
157 std::string PathGetExtension(const std::string& Path); // returns everything in the right-most element following the right-most '.'
158 std::string PathSetExtension(const std::string& Path, const std::string& Extension); // empty extension removes '.' as well
160 std::string PathJoin(const std::string& Path1, const std::string& Path2, char separator = '/');
161 std::string PathJoin(const std::string& Path1, const std::string& Path2, const std::string& Path3, char separator = '/');
162 std::string PathJoin(const std::string& Path1, const std::string& Path2,
163 const std::string& Path3, const std::string& Path4, char separator = '/');
166 //------------------------------------------------------------------------------------------
168 //------------------------------------------------------------------------------------------
170 // An interface for a path matching function, used by FindInPath() and FindInPaths() below
175 virtual ~IPathMatch() {}
176 virtual bool Match(const std::string& s) const = 0;
179 // matches any pathname
180 class PathMatchAny : public IPathMatch
183 virtual ~PathMatchAny() {}
184 inline bool Match(const std::string& s) const { return true; }
188 // matches pathnames using a regular expression
189 class PathMatchRegex : public IPathMatch
193 const PathMatchRegex& operator=(const PathMatchRegex&);
196 PathMatchRegex(const std::string& Pattern);
197 PathMatchRegex(const PathMatchRegex&);
198 virtual ~PathMatchRegex();
199 bool Match(const std::string& s) const;
202 // matches pathnames using a Bourne shell glob expression
203 class PathMatchGlob : public IPathMatch
207 const PathMatchGlob& operator=(const PathMatchGlob&);
210 PathMatchGlob(const std::string& Pattern);
211 PathMatchGlob(const PathMatchGlob&);
212 virtual ~PathMatchGlob();
213 bool Match(const std::string& s) const;
215 #endif /* !KM_WIN32 */
217 // Search all paths in SearchPaths for filenames matching Pattern (no directories are returned).
218 // Put results in FoundPaths. Returns after first find if one_shot is true.
219 PathList_t& FindInPath(const IPathMatch& Pattern, const std::string& SearchDir,
220 PathList_t& FoundPaths, bool one_shot = false, char separator = '/');
222 PathList_t& FindInPaths(const IPathMatch& Pattern, const PathList_t& SearchPaths,
223 PathList_t& FoundPaths, bool one_shot = false, char separator = '/');
225 //------------------------------------------------------------------------------------------
226 // Directory Manipulation
227 //------------------------------------------------------------------------------------------
229 // Create a directory, creates intermediate directories as necessary
230 Result_t CreateDirectoriesInPath(const std::string& Path);
232 // Delete a file (fails if the path points to a directory)
233 Result_t DeleteFile(const std::string& filename);
235 // Recursively remove a file or directory
236 Result_t DeletePath(const std::string& pathname);
238 //------------------------------------------------------------------------------------------
240 //------------------------------------------------------------------------------------------
242 // Instant IO for strings
244 // Reads an entire file into a string.
245 Result_t ReadFileIntoString(const char* filename, std::string& outString, ui32_t max_size = 8 * Megabyte);
247 // Writes a string to a file, overwrites the existing file if present.
248 Result_t WriteStringIntoFile(const char* filename, const std::string& inString);
250 // Instant IO for archivable objects
252 // Unarchives a file into an object
253 Result_t ReadFileIntoObject(const std::string& Filename, IArchive& Object, ui32_t max_size = 8 * Kumu::Megabyte);
255 // Archives an object into a file
256 Result_t WriteObjectIntoFile(const IArchive& Object, const std::string& Filename);
258 // Instant IO for memory buffers
260 // Unarchives a file into a buffer
261 Result_t ReadFileIntoBuffer(const std::string& Filename, Kumu::ByteString& Buffer,
262 ui32_t max_size = 8 * Kumu::Megabyte);
264 // Archives a buffer into a file
265 Result_t WriteBufferIntoFile(const Kumu::ByteString& Buffer, const std::string& Filename);
268 //------------------------------------------------------------------------------------------
270 //------------------------------------------------------------------------------------------
275 KM_NO_COPY_CONSTRUCT(FileReader);
278 std::string m_Filename;
282 FileReader() : m_Handle(INVALID_HANDLE_VALUE) {}
283 virtual ~FileReader() { Close(); }
285 Result_t OpenRead(const char*) const; // open the file for reading
286 Result_t Close() const; // close the file
287 fsize_t Size() const; // returns the file's current size
288 Result_t Seek(Kumu::fpos_t = 0, SeekPos_t = SP_BEGIN) const; // move the file pointer
289 Result_t Tell(Kumu::fpos_t* pos) const; // report the file pointer's location
290 Result_t Read(byte_t*, ui32_t, ui32_t* = 0) const; // read a buffer of data
292 inline Kumu::fpos_t Tell() const // report the file pointer's location
294 Kumu::fpos_t tmp_pos;
299 inline bool IsOpen() { // returns true if the file is open
300 return (m_Handle != INVALID_HANDLE_VALUE);
305 class FileWriter : public FileReader
308 mem_ptr<h__iovec> m_IOVec;
309 KM_NO_COPY_CONSTRUCT(FileWriter);
313 virtual ~FileWriter();
315 Result_t OpenWrite(const char*); // open a new file, overwrites existing
316 Result_t OpenModify(const char*); // open a file for read/write
318 // this part of the interface takes advantage of the iovec structure on
319 // platforms that support it. For each call to Writev(const byte_t*, ui32_t, ui32_t*),
320 // the given buffer is added to an internal iovec struct. All items on the list
321 // are written to disk by a call to Writev();
322 Result_t Writev(const byte_t*, ui32_t); // queue buffer for "gather" write
323 Result_t Writev(ui32_t* = 0); // write all queued buffers
325 // if you call this while there are unwritten items on the iovec list,
326 // the iovec list will be written to disk before the given buffer,as though
327 // you had called Writev() first.
328 Result_t Write(const byte_t*, ui32_t, ui32_t* = 0); // write buffer to disk
331 Result_t CreateDirectoriesInPath(const std::string& Path);
332 Result_t FreeSpaceForPath(const std::string& path, Kumu::fsize_t& free_space, Kumu::fsize_t& total_space);
333 Result_t DeleteFile(const std::string& filename);
334 Result_t DeletePath(const std::string& pathname);
339 #endif // _KM_FILEIO_H_