mirror of
https://github.com/ZDoom/qzdoom.git
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306 lines
6.6 KiB
C++
306 lines
6.6 KiB
C++
/*
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** files.h
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** Implements classes for reading from files or memory blocks
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2008 Randy Heit
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** Copyright 2005-2008 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#ifndef FILES_H
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#define FILES_H
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#include <stdio.h>
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#include <functional>
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#include "doomtype.h"
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#include "m_swap.h"
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// Zip compression methods, extended by some internal types to be passed to OpenDecompressor
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enum
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{
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METHOD_STORED = 0,
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METHOD_SHRINK = 1,
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METHOD_IMPLODE = 6,
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METHOD_DEFLATE = 8,
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METHOD_BZIP2 = 12,
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METHOD_LZMA = 14,
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METHOD_PPMD = 98,
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METHOD_LZSS = 1337, // not used in Zips - this is for Console Doom compression
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METHOD_ZLIB = 1338, // Zlib stream with header, used by compressed nodes.
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};
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class FileReaderInterface
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{
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public:
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long Length = -1;
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virtual ~FileReaderInterface() {}
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virtual long Tell () const = 0;
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virtual long Seek (long offset, int origin) = 0;
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virtual long Read (void *buffer, long len) = 0;
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virtual char *Gets(char *strbuf, int len) = 0;
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virtual const char *GetBuffer() const { return nullptr; }
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long GetLength () const { return Length; }
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};
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class DecompressorBase : public FileReaderInterface
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{
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public:
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// These do not work but need to be defined to satisfy the FileReaderInterface.
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// They will just error out when called.
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long Tell() const override;
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long Seek(long offset, int origin) override;
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char *Gets(char *strbuf, int len) override;
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};
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class MemoryReader : public FileReaderInterface
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{
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protected:
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const char * bufptr = nullptr;
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long FilePos = 0;
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MemoryReader()
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{}
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public:
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MemoryReader(const char *buffer, long length)
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{
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bufptr = buffer;
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Length = length;
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FilePos = 0;
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}
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long Tell() const override;
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long Seek(long offset, int origin) override;
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long Read(void *buffer, long len) override;
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char *Gets(char *strbuf, int len) override;
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virtual const char *GetBuffer() const override { return bufptr; }
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};
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struct FResourceLump;
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class FileReader
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{
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friend struct FResourceLump; // needs access to the private constructor.
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FileReaderInterface *mReader = nullptr;
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FileReader(const FileReader &r) = delete;
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FileReader &operator=(const FileReader &r) = delete;
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explicit FileReader(FileReaderInterface *r)
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{
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mReader = r;
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}
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public:
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enum ESeek
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{
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SeekSet = SEEK_SET,
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SeekCur = SEEK_CUR,
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SeekEnd = SEEK_END
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};
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typedef ptrdiff_t Size; // let's not use 'long' here.
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FileReader() {}
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FileReader(FileReader &&r)
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{
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mReader = r.mReader;
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r.mReader = nullptr;
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}
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FileReader& operator =(FileReader &&r)
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{
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Close();
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mReader = r.mReader;
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r.mReader = nullptr;
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return *this;
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}
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~FileReader()
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{
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Close();
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}
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bool isOpen() const
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{
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return mReader != nullptr;
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}
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void Close()
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{
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if (mReader != nullptr) delete mReader;
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mReader = nullptr;
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}
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bool OpenFile(const char *filename, Size start = 0, Size length = -1);
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bool OpenFilePart(FileReader &parent, Size start, Size length);
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bool OpenMemory(const void *mem, Size length); // read directly from the buffer
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bool OpenMemoryArray(const void *mem, Size length); // read from a copy of the buffer.
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bool OpenMemoryArray(std::function<bool(TArray<uint8_t>&)> getter); // read contents to a buffer and return a reader to it
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bool OpenDecompressor(FileReader &parent, Size length, int method, bool seekable); // creates a decompressor stream. 'seekable' uses a buffered version so that the Seek and Tell methods can be used.
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Size Tell() const
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{
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return mReader->Tell();
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}
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Size Seek(Size offset, ESeek origin)
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{
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return mReader->Seek((long)offset, origin);
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}
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Size Read(void *buffer, Size len)
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{
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return mReader->Read(buffer, (long)len);
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}
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char *Gets(char *strbuf, Size len)
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{
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return mReader->Gets(strbuf, (int)len);
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}
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const char *GetBuffer()
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{
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return mReader->GetBuffer();
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}
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Size GetLength() const
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{
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return mReader->GetLength();
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}
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uint8_t ReadUInt8()
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{
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uint8_t v = 0;
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Read(&v, 1);
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return v;
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}
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int8_t ReadInt8()
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{
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int8_t v = 0;
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Read(&v, 1);
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return v;
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}
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uint16_t ReadUInt16()
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{
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uint16_t v = 0;
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Read(&v, 2);
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return LittleShort(v);
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}
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int16_t ReadInt16()
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{
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uint16_t v = 0;
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Read(&v, 2);
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return LittleShort(v);
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}
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uint32_t ReadUInt32()
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{
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uint32_t v = 0;
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Read(&v, 4);
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return LittleLong(v);
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}
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int32_t ReadInt32()
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{
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uint32_t v = 0;
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Read(&v, 4);
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return LittleLong(v);
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}
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uint32_t ReadUInt32BE()
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{
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uint32_t v = 0;
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Read(&v, 4);
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return BigLong(v);
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}
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int32_t ReadInt32BE()
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{
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uint32_t v = 0;
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Read(&v, 4);
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return BigLong(v);
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}
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friend class FWadCollection;
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};
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class FileWriter
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{
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protected:
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bool OpenDirect(const char *filename);
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FileWriter()
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{
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File = NULL;
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}
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public:
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virtual ~FileWriter()
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{
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if (File != NULL) fclose(File);
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}
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static FileWriter *Open(const char *filename);
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virtual size_t Write(const void *buffer, size_t len);
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virtual long Tell();
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virtual long Seek(long offset, int mode);
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size_t Printf(const char *fmt, ...) GCCPRINTF(2,3);
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protected:
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FILE *File;
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protected:
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bool CloseOnDestruct;
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};
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class BufferWriter : public FileWriter
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{
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protected:
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TArray<unsigned char> mBuffer;
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public:
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BufferWriter() {}
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virtual size_t Write(const void *buffer, size_t len) override;
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TArray<unsigned char> *GetBuffer() { return &mBuffer; }
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};
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#endif
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