ref: 3e7b18472cba687a04f6cd9be66ad531ed24283c
dir: /src/modloaders/ft2_load_s3m.c/
// Scream Tracker 3 (or compatible) S3M loader
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include "../ft2_header.h"
#include "../ft2_module_loader.h"
#include "../ft2_sample_ed.h"
#include "../ft2_tables.h"
#include "../ft2_sysreqs.h"
#ifdef _MSC_VER // please don't mess with these structs!
#pragma pack(push)
#pragma pack(1)
#endif
typedef struct songS3MinstrHeaderTyp_t
{
uint8_t typ;
char dosName[12];
uint8_t memSegH;
uint16_t memSeg;
int32_t len, repS, repE;
uint8_t vol, dsk, pack, flags;
int32_t c2Spd, res1;
uint16_t gusPos;
uint8_t res2[6];
char name[28], id[4];
}
#ifdef __GNUC__
__attribute__ ((packed))
#endif
songS3MinstrHeaderTyp;
typedef struct songS3MHeaderTyp_t
{
char name[28];
uint8_t id1a, typ;
uint16_t res1;
int16_t songTabLen, antInstr, antPatt;
uint16_t flags, trackerID, ver;
char id[4];
uint8_t globalVol, defSpeed, defTempo, masterVol, res2[12], chanType[32];
}
#ifdef __GNUC__
__attribute__ ((packed))
#endif
songS3MHeaderTyp;
#ifdef _MSC_VER
#pragma pack(pop)
#endif
static uint8_t pattBuff[12288];
static int8_t countS3MChannels(uint16_t antPtn);
bool loadS3M(FILE *f, uint32_t filesize)
{
uint8_t ha[2048];
uint8_t alastnfo[32], alastefx[32], alastvibnfo[32], s3mLastGInstr[32];
uint8_t typ;
int16_t ai, ap, ver, ii, kk, tmp;
uint16_t ptnOfs[256];
int32_t i, j, k, len;
tonTyp ton;
sampleTyp *s;
songS3MHeaderTyp h_S3M;
songS3MinstrHeaderTyp h_S3MInstr;
tmpLinearPeriodsFlag = false; // use Amiga periods
if (filesize < sizeof (h_S3M))
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
memset(&h_S3M, 0, sizeof (h_S3M));
if (fread(&h_S3M, 1, sizeof (h_S3M), f) != sizeof (h_S3M))
{
loaderMsgBox("Error: This file is either not a module, or is not supported.");
return false;
}
if (h_S3M.antInstr > MAX_INST || h_S3M.songTabLen > 256 || h_S3M.antPatt > 256 ||
h_S3M.typ != 16 || h_S3M.ver < 1 || h_S3M.ver > 2)
{
loaderMsgBox("Error loading .s3m: Incompatible module!");
return false;
}
memset(songTmp.songTab, 255, sizeof (songTmp.songTab));
if (fread(songTmp.songTab, h_S3M.songTabLen, 1, f) != 1)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
songTmp.len = h_S3M.songTabLen;
// remove pattern separators (254)
k = 0;
j = 0;
for (i = 0; i < songTmp.len; i++)
{
if (songTmp.songTab[i] != 254)
songTmp.songTab[j++] = songTmp.songTab[i];
else
k++;
}
if (k <= songTmp.len)
songTmp.len -= (uint16_t)k;
else
songTmp.len = 1;
for (i = 1; i < songTmp.len; i++)
{
if (songTmp.songTab[i] == 255)
{
songTmp.len = (uint16_t)i;
break;
}
}
// clear unused song table entries
if (songTmp.len < 255)
memset(&songTmp.songTab[songTmp.len], 0, 255-songTmp.len);
songTmp.speed = h_S3M.defTempo;
if (songTmp.speed < 32)
songTmp.speed = 32;
songTmp.tempo = h_S3M.defSpeed;
if (songTmp.tempo == 0)
songTmp.tempo = 6;
if (songTmp.tempo > 31)
songTmp.tempo = 31;
songTmp.initialTempo = songTmp.tempo;
memcpy(songTmp.name, h_S3M.name, 20);
ap = h_S3M.antPatt;
ai = h_S3M.antInstr;
ver = h_S3M.ver;
k = 31;
while (k >= 0 && h_S3M.chanType[k] >= 16) k--;
songTmp.antChn = (k + 2) & 254;
if (fread(ha, ai*2, 1, f) != 1)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
if (fread(ptnOfs, ap*2, 1, f) != 1)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
// *** PATTERNS ***
k = 0;
for (i = 0; i < ap; i++)
{
if (ptnOfs[i] == 0)
continue; // empty pattern
memset(alastnfo, 0, sizeof (alastnfo));
memset(alastefx, 0, sizeof (alastefx));
memset(alastvibnfo, 0, sizeof (alastvibnfo));
memset(s3mLastGInstr, 0, sizeof (s3mLastGInstr));
fseek(f, ptnOfs[i] << 4, SEEK_SET);
if (feof(f))
continue;
if (fread(&j, 2, 1, f) != 1)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
if (j > 0 && j <= 12288)
{
if (!allocateTmpPatt(i, 64))
{
loaderMsgBox("Not enough memory!");
return false;
}
fread(pattBuff, j, 1, f);
k = 0;
kk = 0;
while (k < j && kk < 64)
{
typ = pattBuff[k++];
if (typ == 0)
{
kk++;
}
else
{
ii = typ & 31;
memset(&ton, 0, sizeof (ton));
// note and sample
if (typ & 32)
{
ton.ton = pattBuff[k++];
ton.instr = pattBuff[k++];
if (ton.instr > MAX_INST)
ton.instr = 0;
if (ton.ton == 254) ton.ton = 97;
else if (ton.ton == 255) ton.ton = 0;
else
{
ton.ton = 1 + (ton.ton & 0xF) + (ton.ton >> 4) * 12;
if (ton.ton > 96)
ton.ton = 0;
}
}
// volume column
if (typ & 64)
{
ton.vol = pattBuff[k++];
if (ton.vol <= 64)
ton.vol += 0x10;
else
ton.vol = 0;
}
// effect
if (typ & 128)
{
ton.effTyp = pattBuff[k++];
ton.eff = pattBuff[k++];
if (ton.eff > 0)
{
alastnfo[ii] = ton.eff;
if (ton.effTyp == 8 || ton.effTyp == 21)
alastvibnfo[ii] = ton.eff; // H/U
}
// in ST3, a lot of effects directly share the same memory!
if (ton.eff == 0 && ton.effTyp != 7) // G
{
uint8_t efx = ton.effTyp;
if (efx == 8 || efx == 21) // H/U
ton.eff = alastvibnfo[ii];
else if ((efx >= 4 && efx <= 12) || (efx >= 17 && efx <= 19)) // D/E/F/I/J/K/L/Q/R/S
ton.eff = alastnfo[ii];
/* If effect data is zero and effect type was the same as last one, clear out
** data if it's not J or S (those have no memory in the equivalent XM effects).
** Also goes for extra fine pitch slides and fine volume slides,
** since they get converted to other effects.
*/
if (efx == alastefx[ii] && ton.effTyp != 10 && ton.effTyp != 19) // J/S
{
uint8_t nfo = ton.eff;
bool extraFinePitchSlides = (efx == 5 || efx == 6) && ((nfo & 0xF0) == 0xE0);
bool fineVolSlides = (efx == 4 || efx == 11) &&
((nfo > 0xF0) || (((nfo & 0xF) == 0xF) && ((nfo & 0xF0) > 0)));
if (!extraFinePitchSlides && !fineVolSlides)
ton.eff = 0;
}
}
if (ton.effTyp > 0)
alastefx[ii] = ton.effTyp;
switch (ton.effTyp)
{
case 1: // A
{
ton.effTyp = 0xF;
if (ton.eff == 0 || ton.eff > 0x1F)
{
ton.effTyp = 0;
ton.eff = 0;
}
}
break;
case 2: ton.effTyp = 0xB; break; // B
case 3: ton.effTyp = 0xD; break; // C
case 4: // D
{
if (ton.eff > 0xF0) // fine slide up
{
ton.effTyp = 0xE;
ton.eff = 0xB0 | (ton.eff & 0xF);
}
else if ((ton.eff & 0x0F) == 0x0F && (ton.eff & 0xF0) > 0) // fine slide down
{
ton.effTyp = 0xE;
ton.eff = 0xA0 | (ton.eff >> 4);
}
else
{
ton.effTyp = 0xA;
if (ton.eff & 0x0F) // on D/K, last nybble has first priority in ST3
ton.eff &= 0x0F;
}
}
break;
case 5: // E
case 6: // F
{
if ((ton.eff & 0xF0) >= 0xE0)
{
// convert to fine slide
if ((ton.eff & 0xF0) == 0xE0)
tmp = 0x21;
else
tmp = 0xE;
ton.eff &= 0x0F;
if (ton.effTyp == 0x05)
ton.eff |= 0x20;
else
ton.eff |= 0x10;
ton.effTyp = (uint8_t)tmp;
if (ton.effTyp == 0x21 && ton.eff == 0)
{
ton.effTyp = 0;
}
}
else
{
// convert to normal 1xx/2xx slide
ton.effTyp = 7 - ton.effTyp;
}
}
break;
case 7: // G
{
ton.effTyp = 0x03;
// fix illegal slides (to new instruments)
if (ton.instr != 0 && ton.instr != s3mLastGInstr[ii])
ton.instr = s3mLastGInstr[ii];
}
break;
case 11: // K
{
if (ton.eff > 0xF0) // fine slide up
{
ton.effTyp = 0xE;
ton.eff = 0xB0 | (ton.eff & 0xF);
// if volume column is unoccupied, set to vibrato
if (ton.vol == 0)
ton.vol = 0xB0;
}
else if ((ton.eff & 0x0F) == 0x0F && (ton.eff & 0xF0) > 0) // fine slide down
{
ton.effTyp = 0xE;
ton.eff = 0xA0 | (ton.eff >> 4);
// if volume column is unoccupied, set to vibrato
if (ton.vol == 0)
ton.vol = 0xB0;
}
else
{
ton.effTyp = 0x6;
if (ton.eff & 0x0F) // on D/K, last nybble has first priority in ST3
ton.eff &= 0x0F;
}
}
break;
case 8: ton.effTyp = 0x04; break; // H
case 9: ton.effTyp = 0x1D; break; // I
case 10: ton.effTyp = 0x00; break; // J
case 12: ton.effTyp = 0x05; break; // L
case 15: ton.effTyp = 0x09; break; // O
case 17: ton.effTyp = 0x1B; break; // Q
case 18: ton.effTyp = 0x07; break; // R
case 19: // S
{
ton.effTyp = 0xE;
tmp = ton.eff >> 4;
ton.eff &= 0x0F;
if (tmp == 0x1) ton.eff |= 0x30;
else if (tmp == 0x2) ton.eff |= 0x50;
else if (tmp == 0x3) ton.eff |= 0x40;
else if (tmp == 0x4) ton.eff |= 0x70;
// ignore S8x becuase it's not compatible with FT2 panning
else if (tmp == 0xB) ton.eff |= 0x60;
else if (tmp == 0xC) // Note Cut
{
ton.eff |= 0xC0;
if (ton.eff == 0xC0)
{
// EC0 does nothing in ST3 but cuts voice in FT2, remove effect
ton.effTyp = 0;
ton.eff = 0;
}
}
else if (tmp == 0xD) // Note Delay
{
ton.eff |= 0xD0;
if (ton.ton == 0 || ton.ton == 97)
{
// EDx without a note does nothing in ST3 but retrigs in FT2, remove effect
ton.effTyp = 0;
ton.eff = 0;
}
else if (ton.eff == 0xD0)
{
// ED0 prevents note/smp/vol from updating in ST3, remove everything
ton.ton = 0;
ton.instr = 0;
ton.vol = 0;
ton.effTyp = 0;
ton.eff = 0;
}
}
else if (tmp == 0xE) ton.eff |= 0xE0;
else if (tmp == 0xF) ton.eff |= 0xF0;
else
{
ton.effTyp = 0;
ton.eff = 0;
}
}
break;
case 20: // T
{
ton.effTyp = 0x0F;
if (ton.eff < 0x21) // Txx with a value lower than 33 (0x21) does nothing in ST3, remove effect
{
ton.effTyp = 0;
ton.eff = 0;
}
}
break;
case 22: // V
{
ton.effTyp = 0x10;
if (ton.eff > 0x40)
{
// Vxx > 0x40 does nothing in ST3
ton.effTyp = 0;
ton.eff = 0;
}
}
break;
default:
{
ton.effTyp = 0;
ton.eff = 0;
}
break;
}
}
if (ton.instr != 0 && ton.effTyp != 0x3)
s3mLastGInstr[ii] = ton.instr;
pattTmp[i][(kk * MAX_VOICES) + ii] = ton;
}
}
if (tmpPatternEmpty((uint16_t)i))
{
if (pattTmp[i] != NULL)
{
free(pattTmp[i]);
pattTmp[i] = NULL;
}
}
}
}
// *** SAMPLES ***
bool adlibInsWarn = false;
memcpy(ptnOfs, ha, 512);
for (i = 0; i < ai; i++)
{
fseek(f, ptnOfs[i] << 4, SEEK_SET);
if (fread(&h_S3MInstr, 1, sizeof (h_S3MInstr), f) != sizeof (h_S3MInstr))
{
loaderMsgBox("Not enough memory!");
return false;
}
memcpy(songTmp.instrName[1+i], h_S3MInstr.name, 22);
if (h_S3MInstr.typ == 2)
{
adlibInsWarn = true;
}
else if (h_S3MInstr.typ == 1)
{
if ((h_S3MInstr.flags & (255-1-2-4)) != 0 || h_S3MInstr.pack != 0)
{
loaderMsgBox("Error loading .s3m: Incompatible module!");
return false;
}
else if (h_S3MInstr.memSeg > 0 && h_S3MInstr.len > 0)
{
if (!allocateTmpInstr((int16_t)(1 + i)))
{
loaderMsgBox("Not enough memory!");
return false;
}
setNoEnvelope(instrTmp[1 + i]);
s = &instrTmp[1+i]->samp[0];
// non-FT2: fixes "miracle man.s3m" and other broken S3Ms
if ((h_S3MInstr.memSeg<<4)+h_S3MInstr.len > (int32_t)filesize)
h_S3MInstr.len = filesize - (h_S3MInstr.memSeg << 4);
len = h_S3MInstr.len;
bool hasLoop = h_S3MInstr.flags & 1;
bool stereoSample = (h_S3MInstr.flags >> 1) & 1;
bool is16Bit = (h_S3MInstr.flags >> 2) & 1;
if (is16Bit) // 16-bit
len <<= 1;
if (stereoSample) // stereo
len <<= 1;
if (!allocateTmpSmpData(s, len))
{
loaderMsgBox("Not enough memory!");
return false;
}
memcpy(s->name, h_S3MInstr.name, 21);
if (h_S3MInstr.c2Spd > 65535) // ST3 (and OpenMPT) does this
h_S3MInstr.c2Spd = 65535;
s->len = h_S3MInstr.len;
s->vol = h_S3MInstr.vol;
s->repS = h_S3MInstr.repS;
s->repL = h_S3MInstr.repE - h_S3MInstr.repS;
tuneSample(s, h_S3MInstr.c2Spd, tmpLinearPeriodsFlag);
if (s->vol > 64)
s->vol = 64;
if (s->repL <= 2 || s->repS+s->repL > s->len || s->repL == 0)
{
s->repS = 0;
s->repL = 0;
hasLoop = false;
}
s->typ = hasLoop + (is16Bit << 4);
fseek(f, h_S3MInstr.memSeg << 4, SEEK_SET);
if (ver == 1)
{
fseek(f, len, SEEK_CUR); // sample not supported
}
else
{
if (fread(s->pek, len, 1, f) != 1)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
if (is16Bit)
{
conv16BitSample(s->pek, len, stereoSample);
s->len <<= 1;
s->repS <<= 1;
s->repL <<= 1;
}
else
{
conv8BitSample(s->pek, len, stereoSample);
}
// if stereo sample: reduce memory footprint after sample was downmixed to mono
if (stereoSample)
reallocateTmpSmpData(s, s->len);
}
}
}
}
songTmp.antChn = countS3MChannels(ap);
if (adlibInsWarn)
loaderMsgBox("Warning: The module contains unsupported AdLib instruments!");
if (!(config.dontShowAgainFlags & DONT_SHOW_IMPORT_WARNING_FLAG))
loaderSysReq(6, "System message", "Loading of this format is not fully supported and can have issues.");
return true;
}
static int8_t countS3MChannels(uint16_t antPtn)
{
int32_t channels = 0;
for (int32_t i = 0; i < antPtn; i++)
{
if (pattTmp[i] == NULL)
continue;
tonTyp *ton = pattTmp[i];
for (int32_t j = 0; j < 64; j++)
{
for (int32_t k = 0; k < MAX_VOICES; k++, ton++)
{
if (ton->eff == 0 && ton->effTyp == 0 && ton->instr == 0 && ton->ton == 0 && ton->vol == 0)
continue;
if (k > channels)
channels = k;
}
}
}
channels++;
return (int8_t)channels;
}