63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
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#ifndef _INC_FONTEXT_FONTFILE
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#define _INC_FONTEXT_FONTFILE
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class CFontFileIo;
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//
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// This class provides an abstraction that hides the differences required to read
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// compressed and non-compressed font files. The font folder was originally written
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// to use the LZ APIs provided in LZ32.DLL for all reading of font files. These
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// APIs work with compressed and non-compressed files. The problems is that the
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// APIs are very old and are based on the OpenFile API and DOS file handles. This
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// means they're not UNICODE aware and have a maximum path length of 128 characters.
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// So, even though compressed font files are rare today, all font files are
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// subject to these limitations in the font folder. The LZ APIs are considered
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// legacy code and are not going to be being modified.
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//
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// Since we can't modify the LZ APIs I decided to create this CFontFile class
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// which defers the IO functionality to a properly-typed subclass. Non-compressed
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// files are handled with Win32 functions (i.e. CreateFile, ReadFile etc).
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// Compressed files are handled with LZ functions (i.e. LZOpenFile, LZRead etc).
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// This means that the UNICODE and path length restrictions only affect compressed
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// files and that non-compressed files (the vast majority today) are unaffected.
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//
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// brianau [3/1/99]
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//
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class CFontFile
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{
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public:
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CFontFile(void)
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: m_pImpl(NULL) { }
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~CFontFile(void);
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DWORD Open(LPCTSTR pszPath, DWORD dwAccess, DWORD dwShareMode, bool bCreate = false);
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void Close(void);
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DWORD Read(LPVOID pbDest, DWORD cbDest, LPDWORD pcbRead = NULL);
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DWORD Seek(UINT uDistance, DWORD dwMethod);
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DWORD Reset(void)
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{ return Seek(0, FILE_BEGIN); }
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DWORD GetExpandedName(LPCTSTR pszFile, LPTSTR pszDest, UINT cchDest);
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DWORD CopyTo(LPCTSTR pszTo);
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private:
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CFontFileIo *m_pImpl; // Properly-typed implementation.
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bool IsCompressed(void);
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//
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// Prevent copy.
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//
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CFontFile(const CFontFile& rhs);
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CFontFile& operator = (const CFontFile& rhs);
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};
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#endif // _INC_FONTEXT_FONTFILE
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