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/*
* Load_667.cpp
* ------------
* Purpose: Composer 667 module loader
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "Loaders.h"
OPENMPT_NAMESPACE_BEGIN
struct _667FileHeader
{
using InstrName = std::array<char, 8>;
char magic[2]; // 'gf' (0x6667, ha ha)
InstrName names[64];
uint8 speed;
uint8 numOrders;
uint16le patOffsets[128]; // Relative to end of instrument definitions
bool IsValid() const
{
if(memcmp(magic, "gf", 2) || speed < 1 || speed > 15 || numOrders > 128)
return false;
for(const auto &name : names)
{
for(const char c : name)
{
if(static_cast<unsigned char>(c) <= 31)
return false;
}
}
int32 prevOffset = -1;
for(const int32 offset : patOffsets)
{
if(offset <= prevOffset)
return false;
prevOffset = offset;
}
return true;
}
uint32 GetHeaderMinimumAdditionalSize() const
{
return numOrders + 64 * 11;
}
};
MPT_BINARY_STRUCT(_667FileHeader, 772)
CSoundFile::ProbeResult CSoundFile::ProbeFileHeader667(MemoryFileReader file, const uint64 *pfilesize)
{
_667FileHeader fileHeader;
if(!file.ReadStruct(fileHeader))
return ProbeWantMoreData;
if(!fileHeader.IsValid())
return ProbeFailure;
return ProbeAdditionalSize(file, pfilesize, fileHeader.GetHeaderMinimumAdditionalSize());
}
bool CSoundFile::Read667(FileReader &file, ModLoadingFlags loadFlags)
{
_667FileHeader fileHeader;
file.Rewind();
if(!file.ReadStruct(fileHeader) || !fileHeader.IsValid())
return false;
if(!file.CanRead(fileHeader.GetHeaderMinimumAdditionalSize()))
return false;
if(loadFlags == onlyVerifyHeader)
return true;
InitializeGlobals(MOD_TYPE_S3M, 18);
m_SongFlags.set(SONG_IMPORTED);
Order().SetDefaultTempoInt(150);
Order().SetDefaultSpeed(fileHeader.speed);
m_nSamples = 64;
ReadOrderFromFile<uint8>(Order(), file, fileHeader.numOrders);
for(PATTERNINDEX pat : Order())
{
if(pat >= 128)
return false;
}
for(SAMPLEINDEX smp = 1; smp <= m_nSamples; smp++)
{
// Reorder OPL patch bytes (interleave modulator and carrier)
const auto fm = file.ReadArray<uint8, 11>();
OPLPatch patch{{}};
patch[0] = fm[1]; patch[1] = fm[6];
patch[2] = fm[2]; patch[3] = fm[7];
patch[4] = fm[3]; patch[5] = fm[8];
patch[6] = fm[4]; patch[7] = fm[9];
patch[8] = fm[5]; patch[9] = fm[10];
patch[10] = fm[0];
ModSample &mptSmp = Samples[smp];
mptSmp.Initialize(MOD_TYPE_S3M);
mptSmp.SetAdlib(true, patch);
m_szNames[smp] = mpt::String::ReadBuf(mpt::String::spacePadded, fileHeader.names[smp - 1]);
}
if(loadFlags & loadPatternData)
{
const auto patternOffset = file.GetPosition();
bool leftChn = false, rightChn = false;
Patterns.ResizeArray(128);
for(PATTERNINDEX pat = 0; pat < 128; pat++)
{
// 4674 bytes is the largest sensible pattern size (every cell is written to exactly once + jump at end of pattern)
FileReader patData = file.GetChunkAt(patternOffset + fileHeader.patOffsets[pat], 4674);
if(!patData.IsValid() || !Patterns.Insert(pat, 32))
break;
ROWINDEX row = 0;
auto rowData = Patterns[pat].GetRow(row);
while(patData.CanRead(1))
{
uint8 b = patData.ReadUint8();
if(b == 0xFF)
{
// End of row
uint8 skip = patData.ReadUint8();
row += skip;
if(row >= 32 || skip == 0)
break;
rowData = Patterns[pat].GetRow(row);
} else if(b == 0xFE)
{
// Instrument
auto instr = patData.ReadArray<uint8, 2>();
if(instr[0] >= GetNumChannels() || instr[1] > 63)
return false;
rowData[instr[0]].instr = instr[1] + 1;
} else if(b == 0xFD)
{
// Volume
auto vol = patData.ReadArray<uint8, 2>();
if(vol[0] >= GetNumChannels() || vol[1] > 63)
return false;
rowData[vol[0]].SetVolumeCommand(VOLCMD_VOLUME, 63u - vol[1]);
} else if(b == 0xFC)
{
// Jump to pattern
uint8 target = patData.ReadUint8();
rowData[0].SetEffectCommand(CMD_POSITIONJUMP, target);
} else if(b == 0xFB)
{
// Pattern break
rowData[0].SetEffectCommand(CMD_PATTERNBREAK, 0);
} else if(b < GetNumChannels())
{
// Note data
uint8 note = patData.ReadUint8();
if(note >= 0x7C)
return false;
rowData[b].note = static_cast<ModCommand::NOTE>(NOTE_MIN + 12 + (note & 0x0F) + (note >> 4) * 12);
if(b % 2u)
rightChn = true;
else
leftChn = true;
} else
{
return false;
}
}
}
if(leftChn && rightChn)
{
for(CHANNELINDEX chn = 0; chn < GetNumChannels(); chn++)
{
ChnSettings[chn].nPan = (chn % 2u) ? 256 : 0;
}
}
}
m_modFormat.formatName = UL_("Composer 667");
m_modFormat.type = UL_("667");
m_modFormat.madeWithTracker = UL_("Composer 667");
m_modFormat.charset = mpt::Charset::CP437;
return true;
}
OPENMPT_NAMESPACE_END
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