91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
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/*
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* Loaders.h
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* ---------
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* Purpose: Common functions for module loaders
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "BuildSettings.h"
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#include "../common/misc_util.h"
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#include "../common/FileReader.h"
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#include "Sndfile.h"
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#include "SampleIO.h"
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OPENMPT_NAMESPACE_BEGIN
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// Functions to create 4-byte and 2-byte magic byte identifiers in little-endian format
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// Use this together with uint32le/uint16le file members.
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constexpr uint32 MagicLE(const char(&id)[5])
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{
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return static_cast<uint32>((static_cast<uint8>(id[3]) << 24) | (static_cast<uint8>(id[2]) << 16) | (static_cast<uint8>(id[1]) << 8) | static_cast<uint8>(id[0]));
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}
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constexpr uint16 MagicLE(const char(&id)[3])
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{
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return static_cast<uint16>((static_cast<uint8>(id[1]) << 8) | static_cast<uint8>(id[0]));
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}
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// Functions to create 4-byte and 2-byte magic byte identifiers in big-endian format
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// Use this together with uint32be/uint16be file members.
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// Note: Historically, some magic bytes in MPT-specific fields are reversed (due to the use of multi-char literals).
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// Such fields turned up reversed in files, so MagicBE is used to keep them readable in the code.
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constexpr uint32 MagicBE(const char(&id)[5])
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{
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return static_cast<uint32>((static_cast<uint8>(id[0]) << 24) | (static_cast<uint8>(id[1]) << 16) | (static_cast<uint8>(id[2]) << 8) | static_cast<uint8>(id[3]));
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}
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constexpr uint16 MagicBE(const char(&id)[3])
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{
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return static_cast<uint16>((static_cast<uint8>(id[0]) << 8) | static_cast<uint8>(id[1]));
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}
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// Read 'howMany' order items from an array.
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// 'stopIndex' is treated as '---', 'ignoreIndex' is treated as '+++'. If the format doesn't support such indices, just pass uint16_max.
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template<typename T, size_t arraySize>
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bool ReadOrderFromArray(ModSequence &order, const T(&orders)[arraySize], size_t howMany = arraySize, uint16 stopIndex = uint16_max, uint16 ignoreIndex = uint16_max)
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{
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static_assert(mpt::is_binary_safe<T>::value);
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LimitMax(howMany, arraySize);
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LimitMax(howMany, MAX_ORDERS);
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ORDERINDEX readEntries = static_cast<ORDERINDEX>(howMany);
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order.resize(readEntries);
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for(int i = 0; i < readEntries; i++)
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{
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PATTERNINDEX pat = static_cast<PATTERNINDEX>(orders[i]);
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if(pat == stopIndex) pat = order.GetInvalidPatIndex();
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else if(pat == ignoreIndex) pat = order.GetIgnoreIndex();
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order.at(i) = pat;
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}
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return true;
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}
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// Read 'howMany' order items as integers with defined endianness from a file.
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// 'stopIndex' is treated as '---', 'ignoreIndex' is treated as '+++'. If the format doesn't support such indices, just pass uint16_max.
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template<typename T>
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bool ReadOrderFromFile(ModSequence &order, FileReader &file, size_t howMany, uint16 stopIndex = uint16_max, uint16 ignoreIndex = uint16_max)
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{
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static_assert(mpt::is_binary_safe<T>::value);
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if(!file.CanRead(howMany * sizeof(T)))
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return false;
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LimitMax(howMany, MAX_ORDERS);
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ORDERINDEX readEntries = static_cast<ORDERINDEX>(howMany);
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order.resize(readEntries);
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T patF;
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for(auto &pat : order)
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{
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file.ReadStruct(patF);
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pat = static_cast<PATTERNINDEX>(patF);
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if(pat == stopIndex) pat = order.GetInvalidPatIndex();
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else if(pat == ignoreIndex) pat = order.GetIgnoreIndex();
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}
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return true;
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}
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OPENMPT_NAMESPACE_END
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