mirror of
https://github.com/ZDoom/gzdoom-gles.git
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477 lines
9.7 KiB
C++
477 lines
9.7 KiB
C++
/*
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** files.cpp
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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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#include "files.h"
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#include "templates.h"
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//==========================================================================
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//
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// StdFileReader
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//
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// reads data from an stdio FILE* or part of it.
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//
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//==========================================================================
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class StdFileReader : public FileReaderInterface
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{
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FILE *File = nullptr;
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long StartPos = 0;
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long FilePos = 0;
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public:
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StdFileReader()
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{}
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~StdFileReader()
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{
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if (File != nullptr)
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{
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fclose(File);
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}
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File = nullptr;
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}
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bool Open(const char *filename, long startpos = 0, long len = -1)
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{
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File = fopen(filename, "rb");
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if (File == nullptr) return false;
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FilePos = startpos;
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StartPos = startpos;
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Length = CalcFileLen();
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if (len >= 0 && len < Length) Length = len;
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if (startpos > 0) Seek(0, SEEK_SET);
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return true;
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}
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long Tell() const override
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{
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return FilePos - StartPos;
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}
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long Seek(long offset, int origin) override
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{
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if (origin == SEEK_SET)
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{
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offset += StartPos;
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}
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else if (origin == SEEK_CUR)
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{
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offset += FilePos;
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}
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else if (origin == SEEK_END)
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{
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offset += StartPos + Length;
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}
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if (offset < StartPos || offset > StartPos + Length) return -1; // out of scope
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if (0 == fseek(File, offset, SEEK_SET))
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{
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FilePos = offset;
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return 0;
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}
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return -1;
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}
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long Read(void *buffer, long len) override
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{
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assert(len >= 0);
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if (len <= 0) return 0;
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if (FilePos + len > StartPos + Length)
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{
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len = Length - FilePos + StartPos;
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}
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len = (long)fread(buffer, 1, len, File);
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FilePos += len;
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return len;
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}
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char *Gets(char *strbuf, int len) override
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{
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if (len <= 0 || FilePos >= StartPos + Length) return NULL;
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char *p = fgets(strbuf, len, File);
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if (p != NULL)
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{
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int old = FilePos;
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FilePos = ftell(File);
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if (FilePos - StartPos > Length)
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{
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strbuf[Length - old + StartPos] = 0;
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}
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}
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return p;
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}
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private:
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long CalcFileLen() const
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{
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long endpos;
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fseek(File, 0, SEEK_END);
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endpos = ftell(File);
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fseek(File, 0, SEEK_SET);
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return endpos;
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}
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};
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//==========================================================================
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//
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// FileReaderRedirect
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//
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// like the above, but uses another File reader as its backing data
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//
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//==========================================================================
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class FileReaderRedirect : public FileReaderInterface
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{
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FileReader *mReader = nullptr;
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long StartPos = 0;
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long FilePos = 0;
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public:
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FileReaderRedirect(FileReader &parent, long start, long length)
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{
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mReader = &parent;
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FilePos = start;
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StartPos = start;
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Length = length;
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Seek(0, SEEK_SET);
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}
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virtual long Tell() const override
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{
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return FilePos - StartPos;
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}
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virtual long Seek(long offset, int origin)
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{
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switch (origin)
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{
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case SEEK_SET:
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offset += StartPos;
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break;
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case SEEK_END:
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offset += StartPos + Length;
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break;
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case SEEK_CUR:
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offset += (long)mReader->Tell();
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break;
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}
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if (offset < StartPos || offset > StartPos + Length) return -1; // out of scope
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if (mReader->Seek(offset, FileReader::SeekSet) == 0)
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{
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FilePos = offset;
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return 0;
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}
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return -1;
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}
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virtual long Read(void *buffer, long len)
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{
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assert(len >= 0);
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if (len <= 0) return 0;
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if (FilePos + len > StartPos + Length)
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{
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len = Length - FilePos + StartPos;
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}
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len = (long)mReader->Read(buffer, len);
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FilePos += len;
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return len;
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}
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virtual char *Gets(char *strbuf, int len)
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{
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if (len <= 0 || FilePos >= StartPos + Length) return NULL;
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char *p = mReader->Gets(strbuf, len);
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if (p != NULL)
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{
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int old = FilePos;
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FilePos = (long)mReader->Tell();
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if (FilePos - StartPos > Length)
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{
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strbuf[Length - old + StartPos] = 0;
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}
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}
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return p;
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}
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};
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//==========================================================================
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//
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// MemoryReader
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//
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// reads data from a block of memory
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//
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//==========================================================================
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long MemoryReader::Tell() const
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{
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return FilePos;
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}
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long MemoryReader::Seek(long offset, int origin)
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{
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switch (origin)
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{
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case SEEK_CUR:
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offset += FilePos;
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break;
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case SEEK_END:
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offset += Length;
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break;
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}
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if (offset < 0 || offset >= Length) return -1;
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FilePos = clamp<long>(offset, 0, Length);
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return 0;
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}
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long MemoryReader::Read(void *buffer, long len)
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{
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if (len>Length - FilePos) len = Length - FilePos;
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if (len<0) len = 0;
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memcpy(buffer, bufptr + FilePos, len);
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FilePos += len;
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return len;
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}
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char *MemoryReader::Gets(char *strbuf, int len)
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{
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if (len>Length - FilePos) len = Length - FilePos;
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if (len <= 0) return NULL;
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char *p = strbuf;
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while (len > 1)
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{
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if (bufptr[FilePos] == 0)
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{
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FilePos++;
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break;
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}
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if (bufptr[FilePos] != '\r')
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{
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*p++ = bufptr[FilePos];
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len--;
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if (bufptr[FilePos] == '\n')
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{
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FilePos++;
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break;
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}
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}
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FilePos++;
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}
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if (p == strbuf) return NULL;
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*p++ = 0;
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return strbuf;
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}
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//==========================================================================
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//
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// MemoryArrayReader
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//
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// reads data from an array of memory
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//
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//==========================================================================
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class MemoryArrayReader : public MemoryReader
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{
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TArray<uint8_t> buf;
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public:
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MemoryArrayReader(const char *buffer, long length)
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{
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if (length > 0)
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{
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buf.Resize(length);
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memcpy(&buf[0], buffer, length);
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}
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UpdateBuffer();
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}
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TArray<uint8_t> &GetArray() { return buf; }
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void UpdateBuffer()
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{
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bufptr = (const char*)&buf[0];
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FilePos = 0;
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Length = buf.Size();
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}
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};
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//==========================================================================
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//
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// FileReader
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//
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// this wraps the different reader types in an object with value semantics.
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//
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//==========================================================================
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bool FileReader::OpenFile(const char *filename, FileReader::Size start, FileReader::Size length)
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{
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auto reader = new StdFileReader;
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if (!reader->Open(filename, (long)start, (long)length))
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{
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delete reader;
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return false;
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}
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Close();
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mReader = reader;
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return true;
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}
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bool FileReader::OpenFilePart(FileReader &parent, FileReader::Size start, FileReader::Size length)
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{
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auto reader = new FileReaderRedirect(parent, (long)start, (long)length);
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Close();
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mReader = reader;
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return true;
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}
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bool FileReader::OpenMemory(const void *mem, FileReader::Size length)
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{
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Close();
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mReader = new MemoryReader((const char *)mem, (long)length);
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return true;
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}
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bool FileReader::OpenMemoryArray(const void *mem, FileReader::Size length)
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{
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Close();
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mReader = new MemoryArrayReader((const char *)mem, (long)length);
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return true;
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}
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bool FileReader::OpenMemoryArray(std::function<bool(TArray<uint8_t>&)> getter)
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{
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auto reader = new MemoryArrayReader(nullptr, 0);
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if (getter(reader->GetArray()))
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{
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Close();
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reader->UpdateBuffer();
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mReader = reader;
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return true;
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}
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else
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{
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// This will keep the old buffer, if one existed
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delete reader;
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return false;
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}
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}
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//==========================================================================
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//
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// FileWriter (the motivation here is to have a buffer writing subclass)
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//
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//==========================================================================
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bool FileWriter::OpenDirect(const char *filename)
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{
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File = fopen(filename, "wb");
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return (File != NULL);
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}
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FileWriter *FileWriter::Open(const char *filename)
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{
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FileWriter *fwrit = new FileWriter();
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if (fwrit->OpenDirect(filename))
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{
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return fwrit;
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}
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delete fwrit;
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return NULL;
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}
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size_t FileWriter::Write(const void *buffer, size_t len)
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{
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if (File != NULL)
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{
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return fwrite(buffer, 1, len, File);
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}
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else
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{
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return 0;
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}
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}
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long FileWriter::Tell()
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{
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if (File != NULL)
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{
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return ftell(File);
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}
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else
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{
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return 0;
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}
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}
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long FileWriter::Seek(long offset, int mode)
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{
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if (File != NULL)
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{
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return fseek(File, offset, mode);
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}
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else
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{
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return 0;
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}
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}
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size_t FileWriter::Printf(const char *fmt, ...)
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{
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va_list ap;
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FString out;
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va_start(ap, fmt);
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out.VFormat(fmt, ap);
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va_end(ap);
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return Write(out.GetChars(), out.Len());
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}
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size_t BufferWriter::Write(const void *buffer, size_t len)
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{
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unsigned int ofs = mBuffer.Reserve((unsigned)len);
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memcpy(&mBuffer[ofs], buffer, len);
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return len;
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}
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