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Diffstat (limited to 'libs/taglib/taglib/toolkit/tfile.h')
| -rw-r--r-- | libs/taglib/taglib/toolkit/tfile.h | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/libs/taglib/taglib/toolkit/tfile.h b/libs/taglib/taglib/toolkit/tfile.h new file mode 100644 index 0000000000..680125ac20 --- /dev/null +++ b/libs/taglib/taglib/toolkit/tfile.h @@ -0,0 +1,271 @@ +/*************************************************************************** + copyright : (C) 2002 - 2008 by Scott Wheeler + email : wheeler@kde.org + ***************************************************************************/ + +/*************************************************************************** + * This library is free software; you can redistribute it and/or modify * + * it under the terms of the GNU Lesser General Public License version * + * 2.1 as published by the Free Software Foundation. * + * * + * This library is distributed in the hope that it will be useful, but * + * WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this library; if not, write to the Free Software * + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * + * USA * + * * + * Alternatively, this file is available under the Mozilla Public * + * License Version 1.1. You may obtain a copy of the License at * + * http://www.mozilla.org/MPL/ * + ***************************************************************************/ + +#ifndef TAGLIB_FILE_H +#define TAGLIB_FILE_H + +#include "taglib_export.h" +#include "taglib.h" +#include "tbytevector.h" + +namespace TagLib { + + class String; + class Tag; + class AudioProperties; + +#ifdef _WIN32 + class TAGLIB_EXPORT FileName + { + public: + FileName(const wchar_t *name) : m_wname(name) {} + FileName(const char *name) : m_name(name) {} + operator const wchar_t *() const { return m_wname.c_str(); } + operator const char *() const { return m_name.c_str(); } + private: + std::string m_name; + std::wstring m_wname; + }; +#else + typedef const char *FileName; +#endif + + //! A file class with some useful methods for tag manipulation + + /*! + * This class is a basic file class with some methods that are particularly + * useful for tag editors. It has methods to take advantage of + * ByteVector and a binary search method for finding patterns in a file. + */ + + class TAGLIB_EXPORT File + { + public: + /*! + * Position in the file used for seeking. + */ + enum Position { + //! Seek from the beginning of the file. + Beginning, + //! Seek from the current position in the file. + Current, + //! Seek from the end of the file. + End + }; + + /*! + * Destroys this File instance. + */ + virtual ~File(); + + /*! + * Returns the file name in the local file system encoding. + */ + FileName name() const; + + /*! + * Returns a pointer to this file's tag. This should be reimplemented in + * the concrete subclasses. + */ + virtual Tag *tag() const = 0; + + /*! + * Returns a pointer to this file's audio properties. This should be + * reimplemented in the concrete subclasses. If no audio properties were + * read then this will return a null pointer. + */ + virtual AudioProperties *audioProperties() const = 0; + + /*! + * Save the file and its associated tags. This should be reimplemented in + * the concrete subclasses. Returns true if the save succeeds. + * + * \warning On UNIX multiple processes are able to write to the same file at + * the same time. This can result in serious file corruption. If you are + * developing a program that makes use of TagLib from multiple processes you + * must insure that you are only doing writes to a particular file from one + * of them. + */ + virtual bool save() = 0; + + /*! + * Reads a block of size \a length at the current get pointer. + */ + ByteVector readBlock(ulong length); + + /*! + * Attempts to write the block \a data at the current get pointer. If the + * file is currently only opened read only -- i.e. readOnly() returns true -- + * this attempts to reopen the file in read/write mode. + * + * \note This should be used instead of using the streaming output operator + * for a ByteVector. And even this function is significantly slower than + * doing output with a char[]. + */ + void writeBlock(const ByteVector &data); + + /*! + * Returns the offset in the file that \a pattern occurs at or -1 if it can + * not be found. If \a before is set, the search will only continue until the + * pattern \a before is found. This is useful for tagging purposes to search + * for a tag before the synch frame. + * + * Searching starts at \a fromOffset, which defaults to the beginning of the + * file. + * + * \note This has the practial limitation that \a pattern can not be longer + * than the buffer size used by readBlock(). Currently this is 1024 bytes. + */ + long find(const ByteVector &pattern, + long fromOffset = 0, + const ByteVector &before = ByteVector::null); + + /*! + * Returns the offset in the file that \a pattern occurs at or -1 if it can + * not be found. If \a before is set, the search will only continue until the + * pattern \a before is found. This is useful for tagging purposes to search + * for a tag before the synch frame. + * + * Searching starts at \a fromOffset and proceeds from the that point to the + * beginning of the file and defaults to the end of the file. + * + * \note This has the practial limitation that \a pattern can not be longer + * than the buffer size used by readBlock(). Currently this is 1024 bytes. + */ + long rfind(const ByteVector &pattern, + long fromOffset = 0, + const ByteVector &before = ByteVector::null); + + /*! + * Insert \a data at position \a start in the file overwriting \a replace + * bytes of the original content. + * + * \note This method is slow since it requires rewriting all of the file + * after the insertion point. + */ + void insert(const ByteVector &data, ulong start = 0, ulong replace = 0); + + /*! + * Removes a block of the file starting a \a start and continuing for + * \a length bytes. + * + * \note This method is slow since it involves rewriting all of the file + * after the removed portion. + */ + void removeBlock(ulong start = 0, ulong length = 0); + + /*! + * Returns true if the file is read only (or if the file can not be opened). + */ + bool readOnly() const; + + /*! + * Since the file can currently only be opened as an argument to the + * constructor (sort-of by design), this returns if that open succeeded. + */ + bool isOpen() const; + + /*! + * Returns true if the file is open and readble and valid information for + * the Tag and / or AudioProperties was found. + */ + bool isValid() const; + + /*! + * Move the I/O pointer to \a offset in the file from position \a p. This + * defaults to seeking from the beginning of the file. + * + * \see Position + */ + void seek(long offset, Position p = Beginning); + + /*! + * Reset the end-of-file and error flags on the file. + */ + void clear(); + + /*! + * Returns the current offset withing the file. + */ + long tell() const; + + /*! + * Returns the length of the file. + */ + long length(); + + /*! + * Returns true if \a file can be opened for reading. If the file does not + * exist, this will return false. + * + * \deprecated + */ + static bool isReadable(const char *file); + + /*! + * Returns true if \a file can be opened for writing. + * + * \deprecated + */ + static bool isWritable(const char *name); + + protected: + /*! + * Construct a File object and opens the \a file. \a file should be a + * be a C-string in the local file system encoding. + * + * \note Constructor is protected since this class should only be + * instantiated through subclasses. + */ + File(FileName file); + + /*! + * Marks the file as valid or invalid. + * + * \see isValid() + */ + void setValid(bool valid); + + /*! + * Truncates the file to a \a length. + */ + void truncate(long length); + + /*! + * Returns the buffer size that is used for internal buffering. + */ + static uint bufferSize(); + + private: + File(const File &); + File &operator=(const File &); + + class FilePrivate; + FilePrivate *d; + }; + +} + +#endif |