mirror of
https://github.com/ZDoom/gzdoom-gles.git
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379 lines
No EOL
9.1 KiB
C++
379 lines
No EOL
9.1 KiB
C++
/*
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The common sound font reader interface. Used by GUS, Timidity++ and WildMidi
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backends for reading sound font configurations.
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The FileInterface is also used by streaming sound formats.
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Copyright (C) 2019 Christoph Oelckers
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#pragma once
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#include <stdio.h>
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#include <string.h>
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#include <vector>
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#include <string>
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#if defined _WIN32 && !defined _WINDOWS_ // only define this if windows.h is not included.
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// I'd rather not include Windows.h for just this. This header is not supposed to pollute everything it touches.
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extern "C" __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned CodePage, unsigned long dwFlags, const char* lpMultiByteStr, int cbMultiByte, const wchar_t* lpWideCharStr, int cchWideChar);
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enum
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{
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CP_UTF8 = 65001
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};
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#endif
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namespace MusicIO
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{
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//==========================================================================
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//
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// This class defines a common file wrapper interface which allows these
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// libraries to work with any kind of file access API, e.g. stdio (provided below),
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// Win32, POSIX, iostream or custom implementations (like GZDoom's FileReader.)
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//
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//==========================================================================
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struct FileInterface
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{
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std::string filename;
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long length = -1;
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// It's really too bad that the using code requires long instead of size_t.
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// Fortunately 2GB files are unlikely to come by here.
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protected:
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//
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virtual ~FileInterface() {}
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public:
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virtual char* gets(char* buff, int n) = 0;
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virtual long read(void* buff, int32_t size, int32_t nitems) = 0;
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long read(void* buff, int32_t size) { return read(buff, 1, size); }
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virtual long seek(long offset, int whence) = 0;
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virtual long tell() = 0;
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virtual void close()
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{
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delete this;
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}
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long filelength()
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{
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if (length == -1)
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{
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long pos = tell();
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seek(0, SEEK_END);
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length = tell();
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seek(pos, SEEK_SET);
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}
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return length;
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}
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};
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//==========================================================================
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//
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// Inplementation of the FileInterface for stdio's FILE*.
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//
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//==========================================================================
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struct StdioFileReader : public FileInterface
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{
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FILE* f = nullptr;
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~StdioFileReader()
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{
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if (f) fclose(f);
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}
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char* gets(char* buff, int n) override
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{
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if (!f) return nullptr;
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return fgets(buff, n, f);
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}
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long read(void* buff, int32_t size, int32_t nitems) override
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{
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if (!f) return 0;
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return (long)fread(buff, size, nitems, f);
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}
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long seek(long offset, int whence) override
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{
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if (!f) return 0;
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return fseek(f, offset, whence);
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}
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long tell() override
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{
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if (!f) return 0;
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return ftell(f);
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}
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};
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//==========================================================================
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//
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// Inplementation of the FileInterface for a block of memory
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//
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//==========================================================================
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struct MemoryReader : public FileInterface
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{
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const uint8_t *mData;
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long mLength;
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long mPos;
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MemoryReader(const uint8_t *data, long length)
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: mData(data), mLength(length), mPos(0)
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{
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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 > mLength - mPos) len = mLength - mPos;
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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 (mData[mPos] == 0)
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{
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mPos++;
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break;
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}
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if (mData[mPos] != '\r')
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{
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*p++ = mData[mPos];
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len--;
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if (mData[mPos] == '\n')
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{
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mPos++;
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break;
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}
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}
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mPos++;
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}
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if (p == strbuf) return nullptr;
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*p++ = 0;
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return strbuf;
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}
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long read(void* buff, int32_t size, int32_t nitems) override
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{
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long len = long(size) * nitems;
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if (len > mLength - mPos) len = mLength - mPos;
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if (len < 0) len = 0;
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memcpy(buff, mData + mPos, len);
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mPos += len;
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return len / size;
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}
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long seek(long offset, int whence) override
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{
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switch (whence)
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{
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case SEEK_CUR:
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offset += mPos;
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break;
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case SEEK_END:
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offset += mLength;
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break;
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}
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if (offset < 0 || offset > mLength) return -1;
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mPos = offset;
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return 0;
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}
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long tell() override
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{
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return mPos;
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}
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protected:
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MemoryReader() {}
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};
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//==========================================================================
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//
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// Inplementation of the FileInterface for an std::vector owned by the reader
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//
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//==========================================================================
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struct VectorReader : public MemoryReader
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{
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std::vector<uint8_t> mVector;
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template <class getFunc>
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VectorReader(getFunc getter) // read contents to a buffer and return a reader to it
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{
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getter(mVector);
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mData = mVector.data();
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mLength = (long)mVector.size();
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}
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};
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//==========================================================================
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//
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// The follpwing two functions are needed to allow using UTF-8 in the file interface.
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// fopen on Windows is only safe for ASCII,
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//
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//==========================================================================
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#ifdef _WIN32
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inline std::wstring wideString(const char *filename)
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{
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std::wstring filePathW;
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auto len = strlen(filename);
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filePathW.resize(len);
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int newSize = MultiByteToWideChar(CP_UTF8, 0, filename, (int)len, const_cast<wchar_t*>(filePathW.c_str()), (int)len);
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filePathW.resize(newSize);
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return filePathW;
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}
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#endif
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inline FILE* utf8_fopen(const char* filename, const char *mode)
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{
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#ifndef _WIN32
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return fopen(filename, "wb");
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#else
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auto fn = wideString(filename);
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auto mo = wideString(mode);
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return _wfopen(fn.c_str(), mo.c_str());
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#endif
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}
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inline bool fileExists(const char *fn)
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{
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FILE *f = utf8_fopen(fn, "rb");
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if (!f) return false;
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fclose(f);
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return true;
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}
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//==========================================================================
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//
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// This class providea a framework for reading sound fonts.
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// This is needed when the sound font data is not read from
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// the file system. e.g. zipped GUS patch sets.
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//
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//==========================================================================
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class SoundFontReaderInterface
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{
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public:
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virtual ~SoundFontReaderInterface() {}
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virtual struct FileInterface* open_file(const char* fn) = 0;
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virtual void add_search_path(const char* path) = 0;
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};
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//==========================================================================
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//
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// A basic sound font reader for reading data from the file system.
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//
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//==========================================================================
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class FileSystemSoundFontReader : public SoundFontReaderInterface
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{
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protected:
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std::vector<std::string> mPaths;
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std::string mBaseFile;
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bool mAllowAbsolutePaths;
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bool IsAbsPath(const char *name)
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{
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if (name[0] == '/' || name[0] == '\\') return true;
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#ifdef _WIN32
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/* [A-Za-z]: (for Windows) */
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if (isalpha(name[0]) && name[1] == ':') return true;
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#endif /* _WIN32 */
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return 0;
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}
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public:
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FileSystemSoundFontReader(const char *configfilename, bool allowabs = false)
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{
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// Note that this does not add the directory the base file is in to the search path!
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// The caller of this has to do it themselves!
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mBaseFile = configfilename;
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mAllowAbsolutePaths = allowabs;
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}
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struct FileInterface* open_file(const char* fn) override
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{
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FILE *f = nullptr;
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std::string fullname;
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if (!fn)
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{
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f = utf8_fopen(mBaseFile.c_str(), "rt");
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fullname = mBaseFile;
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}
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else
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{
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if (!IsAbsPath(fn))
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{
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for(int i = (int)mPaths.size()-1; i>=0; i--)
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{
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fullname = mPaths[i] + fn;
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f = utf8_fopen(fullname.c_str(), "rt");
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break;
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}
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}
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if (!f) f = fopen(fn, "rt");
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}
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if (!f) return nullptr;
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auto tf = new StdioFileReader;
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tf->f = f;
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tf->filename = fullname;
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return tf;
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}
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void add_search_path(const char* path) override
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{
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std::string p = path;
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if (p.back() != '/' && p.back() != '\\') p += '/'; // always let it end with a slash.
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mPaths.push_back(p);
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}
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};
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//==========================================================================
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//
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// This reader exists to trick Timidity config readers into accepting
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// a loose SF2 file by providing a fake config pointing to the given file.
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//
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//==========================================================================
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class SF2Reader : public FileSystemSoundFontReader
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{
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std::string mMainConfigForSF2;
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public:
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SF2Reader(const char *filename)
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: FileSystemSoundFontReader(filename)
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{
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mMainConfigForSF2 = "soundfont \"" + mBaseFile + "\"\n";
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}
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struct FileInterface* open_file(const char* fn) override
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{
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if (fn == nullptr)
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{
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return new MemoryReader((uint8_t*)mMainConfigForSF2.c_str(), (long)mMainConfigForSF2.length());
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}
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else return FileSystemSoundFontReader::open_file(fn);
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}
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};
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}
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