winamp/Src/external_dependencies/openmpt-trunk/common/FileReader.h
2024-09-24 14:54:57 +02:00

454 lines
14 KiB
C++

/*
* FileReader.h
* ------------
* Purpose: A basic class for transparent reading of memory-based files.
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#pragma once
#include "openmpt/all/BuildSettings.hpp"
#include "mpt/io_read/filecursor.hpp"
#include "mpt/io_read/filecursor_filename_traits.hpp"
#include "mpt/io_read/filecursor_traits_filedata.hpp"
#include "mpt/io_read/filecursor_traits_memory.hpp"
#include "mpt/io_read/filereader.hpp"
#include "openmpt/base/Types.hpp"
#include "mptPathString.h"
#include "mptStringBuffer.h"
#include <algorithm>
#include <array>
#include <limits>
#include <optional>
#include <string>
#include <vector>
#include <cstring>
#include "FileReaderFwd.h"
OPENMPT_NAMESPACE_BEGIN
namespace FileReaderExt
{
// Read a string of length srcSize into fixed-length char array destBuffer using a given read mode.
// The file cursor is advanced by "srcSize" bytes.
// Returns true if at least one byte could be read or 0 bytes were requested.
template<mpt::String::ReadWriteMode mode, size_t destSize, typename TFileCursor>
bool ReadString(TFileCursor &f, char (&destBuffer)[destSize], const typename TFileCursor::pos_type srcSize)
{
typename TFileCursor::PinnedView source = f.ReadPinnedView(srcSize); // Make sure the string is cached properly.
typename TFileCursor::pos_type realSrcSize = source.size(); // In case fewer bytes are available
mpt::String::WriteAutoBuf(destBuffer) = mpt::String::ReadBuf(mode, mpt::byte_cast<const char*>(source.data()), realSrcSize);
return (realSrcSize > 0 || srcSize == 0);
}
// Read a string of length srcSize into a std::string dest using a given read mode.
// The file cursor is advanced by "srcSize" bytes.
// Returns true if at least one character could be read or 0 characters were requested.
template<mpt::String::ReadWriteMode mode, typename TFileCursor>
bool ReadString(TFileCursor &f, std::string &dest, const typename TFileCursor::pos_type srcSize)
{
dest.clear();
typename TFileCursor::PinnedView source = f.ReadPinnedView(srcSize); // Make sure the string is cached properly.
typename TFileCursor::pos_type realSrcSize = source.size(); // In case fewer bytes are available
dest = mpt::String::ReadBuf(mode, mpt::byte_cast<const char*>(source.data()), realSrcSize);
return (realSrcSize > 0 || srcSize == 0);
}
// Read a string of length srcSize into a mpt::charbuf dest using a given read mode.
// The file cursor is advanced by "srcSize" bytes.
// Returns true if at least one character could be read or 0 characters were requested.
template<mpt::String::ReadWriteMode mode, std::size_t len, typename TFileCursor>
bool ReadString(TFileCursor &f, mpt::charbuf<len> &dest, const typename TFileCursor::pos_type srcSize)
{
typename TFileCursor::PinnedView source = f.ReadPinnedView(srcSize); // Make sure the string is cached properly.
typename TFileCursor::pos_type realSrcSize = source.size(); // In case fewer bytes are available
dest = mpt::String::ReadBuf(mode, mpt::byte_cast<const char*>(source.data()), realSrcSize);
return (realSrcSize > 0 || srcSize == 0);
}
// Read a charset encoded string of length srcSize into a mpt::ustring dest using a given read mode.
// The file cursor is advanced by "srcSize" bytes.
// Returns true if at least one character could be read or 0 characters were requested.
template<mpt::String::ReadWriteMode mode, typename TFileCursor>
bool ReadString(TFileCursor &f, mpt::ustring &dest, mpt::Charset charset, const typename TFileCursor::pos_type srcSize)
{
dest.clear();
typename TFileCursor::PinnedView source = f.ReadPinnedView(srcSize); // Make sure the string is cached properly.
typename TFileCursor::pos_type realSrcSize = source.size(); // In case fewer bytes are available
dest = mpt::ToUnicode(charset, mpt::String::ReadBuf(mode, mpt::byte_cast<const char*>(source.data()), realSrcSize));
return (realSrcSize > 0 || srcSize == 0);
}
// Read a string with a preprended length field of type Tsize (must be a packed<*,*> type) into a std::string dest using a given read mode.
// The file cursor is advanced by the string length.
// Returns true if the size field could be read and at least one character could be read or 0 characters were requested.
template<typename Tsize, mpt::String::ReadWriteMode mode, size_t destSize, typename TFileCursor>
bool ReadSizedString(TFileCursor &f, char (&destBuffer)[destSize], const typename TFileCursor::pos_type maxLength = std::numeric_limits<typename TFileCursor::pos_type>::max())
{
mpt::packed<typename Tsize::base_type, typename Tsize::endian_type> srcSize; // Enforce usage of a packed type by ensuring that the passed type has the required typedefs
if(!mpt::IO::FileReader::Read(f, srcSize))
{
return false;
}
return FileReaderExt::ReadString<mode>(f, destBuffer, std::min(static_cast<typename TFileCursor::pos_type>(srcSize), maxLength));
}
// Read a string with a preprended length field of type Tsize (must be a packed<*,*> type) into a std::string dest using a given read mode.
// The file cursor is advanced by the string length.
// Returns true if the size field could be read and at least one character could be read or 0 characters were requested.
template<typename Tsize, mpt::String::ReadWriteMode mode, typename TFileCursor>
bool ReadSizedString(TFileCursor &f, std::string &dest, const typename TFileCursor::pos_type maxLength = std::numeric_limits<typename TFileCursor::pos_type>::max())
{
mpt::packed<typename Tsize::base_type, typename Tsize::endian_type> srcSize; // Enforce usage of a packed type by ensuring that the passed type has the required typedefs
if(!mpt::IO::FileReader::Read(f, srcSize))
{
return false;
}
return FileReaderExt::ReadString<mode>(f, dest, std::min(static_cast<typename TFileCursor::pos_type>(srcSize), maxLength));
}
// Read a string with a preprended length field of type Tsize (must be a packed<*,*> type) into a mpt::charbuf dest using a given read mode.
// The file cursor is advanced by the string length.
// Returns true if the size field could be read and at least one character could be read or 0 characters were requested.
template<typename Tsize, mpt::String::ReadWriteMode mode, std::size_t len, typename TFileCursor>
bool ReadSizedString(TFileCursor &f, mpt::charbuf<len> &dest, const typename TFileCursor::pos_type maxLength = std::numeric_limits<typename TFileCursor::pos_type>::max())
{
mpt::packed<typename Tsize::base_type, typename Tsize::endian_type> srcSize; // Enforce usage of a packed type by ensuring that the passed type has the required typedefs
if(!mpt::IO::FileReader::Read(f, srcSize))
{
return false;
}
return FileReaderExt::ReadString<mode>(f, dest, std::min(static_cast<typename TFileCursor::pos_type>(srcSize), maxLength));
}
} // namespace FileReaderExt
namespace detail {
template <typename Ttraits, typename Tfilenametraits>
using FileCursor = mpt::IO::FileCursor<Ttraits, Tfilenametraits>;
template <typename Ttraits, typename Tfilenametraits>
class FileReader
: public FileCursor<Ttraits, Tfilenametraits>
{
private:
using traits_type = Ttraits;
using filename_traits_type = Tfilenametraits;
public:
using pos_type = typename traits_type::pos_type;
using off_t = pos_type;
using data_type = typename traits_type::data_type;
using ref_data_type = typename traits_type::ref_data_type;
using shared_data_type = typename traits_type::shared_data_type;
using value_data_type = typename traits_type::value_data_type;
using shared_filename_type = typename filename_traits_type::shared_filename_type;
public:
// Initialize invalid file reader object.
FileReader()
{
return;
}
FileReader(const FileCursor<Ttraits, Tfilenametraits> &other)
: FileCursor<Ttraits, Tfilenametraits>(other)
{
return;
}
FileReader(FileCursor<Ttraits, Tfilenametraits> &&other)
: FileCursor<Ttraits, Tfilenametraits>(std::move(other))
{
return;
}
// Initialize file reader object with pointer to data and data length.
template <typename Tbyte>
explicit FileReader(mpt::span<Tbyte> bytedata, shared_filename_type filename = shared_filename_type{})
: FileCursor<Ttraits, Tfilenametraits>(bytedata, std::move(filename))
{
return;
}
// Initialize file reader object based on an existing file reader object window.
explicit FileReader(value_data_type other, shared_filename_type filename = shared_filename_type{})
: FileCursor<Ttraits, Tfilenametraits>(std::move(other), std::move(filename))
{
return;
}
public:
template <typename T>
bool Read(T &target)
{
return mpt::IO::FileReader::Read(*this, target);
}
template <typename T>
T ReadIntLE()
{
return mpt::IO::FileReader::ReadIntLE<T>(*this);
}
template <typename T>
T ReadIntBE()
{
return mpt::IO::FileReader::ReadIntLE<T>(*this);
}
template <typename T>
T ReadTruncatedIntLE(pos_type size)
{
return mpt::IO::FileReader::ReadTruncatedIntLE<T>(*this, size);
}
template <typename T>
T ReadSizedIntLE(pos_type size)
{
return mpt::IO::FileReader::ReadSizedIntLE<T>(*this, size);
}
uint32 ReadUint32LE()
{
return mpt::IO::FileReader::ReadUint32LE(*this);
}
uint32 ReadUint32BE()
{
return mpt::IO::FileReader::ReadUint32BE(*this);
}
int32 ReadInt32LE()
{
return mpt::IO::FileReader::ReadInt32LE(*this);
}
int32 ReadInt32BE()
{
return mpt::IO::FileReader::ReadInt32BE(*this);
}
uint32 ReadUint24LE()
{
return mpt::IO::FileReader::ReadUint24LE(*this);
}
uint32 ReadUint24BE()
{
return mpt::IO::FileReader::ReadUint24BE(*this);
}
uint16 ReadUint16LE()
{
return mpt::IO::FileReader::ReadUint16LE(*this);
}
uint16 ReadUint16BE()
{
return mpt::IO::FileReader::ReadUint16BE(*this);
}
int16 ReadInt16LE()
{
return mpt::IO::FileReader::ReadInt16LE(*this);
}
int16 ReadInt16BE()
{
return mpt::IO::FileReader::ReadInt16BE(*this);
}
char ReadChar()
{
return mpt::IO::FileReader::ReadChar(*this);
}
uint8 ReadUint8()
{
return mpt::IO::FileReader::ReadUint8(*this);
}
int8 ReadInt8()
{
return mpt::IO::FileReader::ReadInt8(*this);
}
float ReadFloatLE()
{
return mpt::IO::FileReader::ReadFloatLE(*this);
}
float ReadFloatBE()
{
return mpt::IO::FileReader::ReadFloatBE(*this);
}
double ReadDoubleLE()
{
return mpt::IO::FileReader::ReadDoubleLE(*this);
}
double ReadDoubleBE()
{
return mpt::IO::FileReader::ReadDoubleBE(*this);
}
template <typename T>
bool ReadStruct(T &target)
{
return mpt::IO::FileReader::ReadStruct(*this, target);
}
template <typename T>
size_t ReadStructPartial(T &target, size_t partialSize = sizeof(T))
{
return mpt::IO::FileReader::ReadStructPartial(*this, target, partialSize);
}
bool ReadNullString(std::string &dest, const pos_type maxLength = std::numeric_limits<pos_type>::max())
{
return mpt::IO::FileReader::ReadNullString(*this, dest, maxLength);
}
bool ReadLine(std::string &dest, const pos_type maxLength = std::numeric_limits<pos_type>::max())
{
return mpt::IO::FileReader::ReadLine(*this, dest, maxLength);
}
template<typename T, std::size_t destSize>
bool ReadArray(T (&destArray)[destSize])
{
return mpt::IO::FileReader::ReadArray(*this, destArray);
}
template<typename T, std::size_t destSize>
bool ReadArray(std::array<T, destSize> &destArray)
{
return mpt::IO::FileReader::ReadArray(*this, destArray);
}
template <typename T, std::size_t destSize>
std::array<T, destSize> ReadArray()
{
return mpt::IO::FileReader::ReadArray<T, destSize>(*this);
}
template<typename T>
bool ReadVector(std::vector<T> &destVector, size_t destSize)
{
return mpt::IO::FileReader::ReadVector(*this, destVector, destSize);
}
template<size_t N>
bool ReadMagic(const char (&magic)[N])
{
return mpt::IO::FileReader::ReadMagic(*this, magic);
}
template<typename T>
bool ReadVarInt(T &target)
{
return mpt::IO::FileReader::ReadVarInt(*this, target);
}
template <typename T>
using Item = mpt::IO::FileReader::Chunk<T, FileReader>;
template <typename T>
using ChunkList = mpt::IO::FileReader::ChunkList<T, FileReader>;
template<typename T>
Item<T> ReadNextChunk(off_t alignment)
{
return mpt::IO::FileReader::ReadNextChunk<T, FileReader>(*this, alignment);
}
template<typename T>
ChunkList<T> ReadChunks(off_t alignment)
{
return mpt::IO::FileReader::ReadChunks<T, FileReader>(*this, alignment);
}
template<typename T>
ChunkList<T> ReadChunksUntil(off_t alignment, decltype(T().GetID()) stopAtID)
{
return mpt::IO::FileReader::ReadChunksUntil<T, FileReader>(*this, alignment, stopAtID);
}
template<mpt::String::ReadWriteMode mode, size_t destSize>
bool ReadString(char (&destBuffer)[destSize], const pos_type srcSize)
{
return FileReaderExt::ReadString<mode>(*this, destBuffer, srcSize);
}
template<mpt::String::ReadWriteMode mode>
bool ReadString(std::string &dest, const pos_type srcSize)
{
return FileReaderExt::ReadString<mode>(*this, dest, srcSize);
}
template<mpt::String::ReadWriteMode mode, std::size_t len>
bool ReadString(mpt::charbuf<len> &dest, const pos_type srcSize)
{
return FileReaderExt::ReadString<mode>(*this, dest, srcSize);
}
template<mpt::String::ReadWriteMode mode>
bool ReadString(mpt::ustring &dest, mpt::Charset charset, const pos_type srcSize)
{
return FileReaderExt::ReadString<mode>(*this, dest, charset, srcSize);
}
template<typename Tsize, mpt::String::ReadWriteMode mode, size_t destSize>
bool ReadSizedString(char (&destBuffer)[destSize], const pos_type maxLength = std::numeric_limits<pos_type>::max())
{
return FileReaderExt::ReadSizedString<Tsize, mode>(*this, destBuffer, maxLength);
}
template<typename Tsize, mpt::String::ReadWriteMode mode>
bool ReadSizedString(std::string &dest, const pos_type maxLength = std::numeric_limits<pos_type>::max())
{
return FileReaderExt::ReadSizedString<Tsize, mode>(*this, dest, maxLength);
}
template<typename Tsize, mpt::String::ReadWriteMode mode, std::size_t len>
bool ReadSizedString(mpt::charbuf<len> &dest, const pos_type maxLength = std::numeric_limits<pos_type>::max())
{
return FileReaderExt::ReadSizedString<Tsize, mode, len>(*this, dest, maxLength);
}
};
} // namespace detail
using FileCursor = detail::FileCursor<mpt::IO::FileCursorTraitsFileData, mpt::IO::FileCursorFilenameTraits<mpt::PathString>>;
using FileReader = detail::FileReader<mpt::IO::FileCursorTraitsFileData, mpt::IO::FileCursorFilenameTraits<mpt::PathString>>;
using ChunkReader = FileReader;
using MemoryFileCursor = detail::FileCursor<mpt::IO::FileCursorTraitsMemory, mpt::IO::FileCursorFilenameTraitsNone>;
using MemoryFileReader = detail::FileReader<mpt::IO::FileCursorTraitsMemory, mpt::IO::FileCursorFilenameTraitsNone>;
OPENMPT_NAMESPACE_END