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
17 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 bool PathsAreEquivalent(const std::string& lhs, const std::string& rhs); // true if paths point to the same filesystem entry
138 // Returns free space and total space available for the given path
139 Result_t FreeSpaceForPath(const std::string& path, Kumu::fsize_t& free_space, Kumu::fsize_t& total_space);
141 // split and reassemble paths as lists of path components
142 PathCompList_t& PathToComponents(const std::string& Path, PathCompList_t& CList, char separator = '/'); // removes '//'
143 std::string ComponentsToPath(const PathCompList_t& CList, char separator = '/');
144 std::string ComponentsToAbsolutePath(const PathCompList_t& CList, char separator = '/'); // add separator to the front
145 bool PathHasComponents(const std::string& Path, char separator = '/'); // true if paths starts with separator
147 bool PathIsAbsolute(const std::string& Path, char separator = '/'); // true if path begins with separator
148 std::string PathMakeAbsolute(const std::string& Path, char separator = '/'); // compute position of relative path using getcwd()
149 std::string PathMakeLocal(const std::string& Path, const std::string& Parent); // remove Parent from front of Path, if it exists
150 std::string PathMakeCanonical(const std::string& Path, char separator = '/'); // remove '.' and '..'
153 std::string PathBasename(const std::string& Path, char separator = '/'); // returns right-most path element (list back())
154 std::string PathDirname(const std::string& Path, char separator = '/'); // returns everything but the right-most element
155 std::string PathGetExtension(const std::string& Path); // returns everything in the right-most element following the right-most '.'
156 std::string PathSetExtension(const std::string& Path, const std::string& Extension); // empty extension removes '.' as well
159 //------------------------------------------------------------------------------------------
161 //------------------------------------------------------------------------------------------
163 // An interface for a path matching function, used by FindInPath() and FindInPaths() below
168 virtual ~IPathMatch() {}
169 virtual bool Match(const std::string& s) const = 0;
172 // matches any pathname
173 class PathMatchAny : public IPathMatch
176 virtual ~PathMatchAny() {}
177 inline bool Match(const std::string& s) const { return true; }
181 // matches pathnames using a regular expression
182 class PathMatchRegex : public IPathMatch
186 const PathMatchRegex& operator=(const PathMatchRegex&);
189 PathMatchRegex(const std::string& Pattern);
190 PathMatchRegex(const PathMatchRegex&);
191 virtual ~PathMatchRegex();
192 bool Match(const std::string& s) const;
195 // matches pathnames using a Bourne shell glob expression
196 class PathMatchGlob : public IPathMatch
200 const PathMatchGlob& operator=(const PathMatchGlob&);
203 PathMatchGlob(const std::string& Pattern);
204 PathMatchGlob(const PathMatchGlob&);
205 virtual ~PathMatchGlob();
206 bool Match(const std::string& s) const;
208 #endif /* !KM_WIN32 */
210 // Search all paths in SearchPaths for filenames matching Pattern (no directories are returned).
211 // Put results in FoundPaths. Returns after first find if one_shot is true.
212 PathList_t& FindInPath(const IPathMatch& Pattern, const std::string& SearchDir,
213 PathList_t& FoundPaths, bool one_shot = false, char separator = '/');
215 PathList_t& FindInPaths(const IPathMatch& Pattern, const PathList_t& SearchPaths,
216 PathList_t& FoundPaths, bool one_shot = false, char separator = '/');
218 //------------------------------------------------------------------------------------------
219 // Directory Manipulation
220 //------------------------------------------------------------------------------------------
222 // Create a directory, creates intermediate directories as necessary
223 Result_t CreateDirectoriesInPath(const std::string& Path);
225 // Delete a file (fails if the path points to a directory)
226 Result_t DeleteFile(const std::string& filename);
228 // Recursively remove a file or directory
229 Result_t DeletePath(const std::string& pathname);
231 //------------------------------------------------------------------------------------------
233 //------------------------------------------------------------------------------------------
235 // Instant IO for strings
237 // Reads an entire file into a string.
238 Result_t ReadFileIntoString(const char* filename, std::string& outString, ui32_t max_size = 8 * Megabyte);
240 // Writes a string to a file, overwrites the existing file if present.
241 Result_t WriteStringIntoFile(const char* filename, const std::string& inString);
243 // Instant IO for archivable objects
245 // Unarchives a file into an object
246 Result_t ReadFileIntoObject(const std::string& Filename, IArchive& Object, ui32_t max_size = 8 * Kumu::Megabyte);
248 // Archives an object into a file
249 Result_t WriteObjectIntoFile(const IArchive& Object, const std::string& Filename);
251 // Instant IO for memory buffers
253 // Unarchives a file into a buffer
254 Result_t ReadFileIntoBuffer(const std::string& Filename, Kumu::ByteString& Buffer,
255 ui32_t max_size = 8 * Kumu::Megabyte);
257 // Archives a buffer into a file
258 Result_t WriteBufferIntoFile(const Kumu::ByteString& Buffer, const std::string& Filename);
261 //------------------------------------------------------------------------------------------
263 //------------------------------------------------------------------------------------------
268 KM_NO_COPY_CONSTRUCT(FileReader);
271 std::string m_Filename;
275 FileReader() : m_Handle(INVALID_HANDLE_VALUE) {}
276 virtual ~FileReader() { Close(); }
278 Result_t OpenRead(const char*) const; // open the file for reading
279 Result_t Close() const; // close the file
280 fsize_t Size() const; // returns the file's current size
281 Result_t Seek(Kumu::fpos_t = 0, SeekPos_t = SP_BEGIN) const; // move the file pointer
282 Result_t Tell(Kumu::fpos_t* pos) const; // report the file pointer's location
283 Result_t Read(byte_t*, ui32_t, ui32_t* = 0) const; // read a buffer of data
285 inline Kumu::fpos_t Tell() const // report the file pointer's location
287 Kumu::fpos_t tmp_pos;
292 inline bool IsOpen() { // returns true if the file is open
293 return (m_Handle != INVALID_HANDLE_VALUE);
298 class FileWriter : public FileReader
301 mem_ptr<h__iovec> m_IOVec;
302 KM_NO_COPY_CONSTRUCT(FileWriter);
306 virtual ~FileWriter();
308 Result_t OpenWrite(const char*); // open a new file, overwrites existing
309 Result_t OpenModify(const char*); // open a file for read/write
311 // this part of the interface takes advantage of the iovec structure on
312 // platforms that support it. For each call to Writev(const byte_t*, ui32_t, ui32_t*),
313 // the given buffer is added to an internal iovec struct. All items on the list
314 // are written to disk by a call to Writev();
315 Result_t Writev(const byte_t*, ui32_t); // queue buffer for "gather" write
316 Result_t Writev(ui32_t* = 0); // write all queued buffers
318 // if you call this while there are unwritten items on the iovec list,
319 // the iovec list will be written to disk before the given buffer,as though
320 // you had called Writev() first.
321 Result_t Write(const byte_t*, ui32_t, ui32_t* = 0); // write buffer to disk
324 Result_t CreateDirectoriesInPath(const std::string& Path);
325 Result_t FreeSpaceForPath(const std::string& path, Kumu::fsize_t& free_space, Kumu::fsize_t& total_space);
326 Result_t DeleteFile(const std::string& filename);
327 Result_t DeletePath(const std::string& pathname);
332 #endif // _KM_FILEIO_H_