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Diffstat (limited to 'plugins/dumb/dumb-kode54/src/it/itread.c')
-rw-r--r--plugins/dumb/dumb-kode54/src/it/itread.c2675
1 files changed, 1343 insertions, 1332 deletions
diff --git a/plugins/dumb/dumb-kode54/src/it/itread.c b/plugins/dumb/dumb-kode54/src/it/itread.c
index 8f5e7ef6..7170a57f 100644
--- a/plugins/dumb/dumb-kode54/src/it/itread.c
+++ b/plugins/dumb/dumb-kode54/src/it/itread.c
@@ -1,1332 +1,1343 @@
-/* _______ ____ __ ___ ___
- * \ _ \ \ / \ / \ \ / / ' ' '
- * | | \ \ | | || | \/ | . .
- * | | | | | | || ||\ /| |
- * | | | | | | || || \/ | | ' ' '
- * | | | | | | || || | | . .
- * | |_/ / \ \__// || | |
- * /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
- * / \
- * / . \
- * itread.c - Code to read an Impulse Tracker / / \ \
- * module from an open file. | < / \_
- * | \/ /\ /
- * Based on the loader from an IT player by Bob. \_ / > /
- * Adapted for DUMB by entheh. | \ / /
- * | ' /
- * \__/
- */
-
-#include <stdlib.h>
-#include <string.h>//might not be necessary later; required for memset
-
-#include "dumb.h"
-#include "internal/it.h"
-
-
-
-#define INVESTIGATE_OLD_INSTRUMENTS
-
-
-
-static int it_seek(DUMBFILE *f, long offset)
-{
- long pos = dumbfile_pos(f);
-
- if (pos > offset)
- return -1;
-
- if (pos < offset)
- if (dumbfile_skip(f, offset - pos))
- return -1;
-
- return 0;
-}
-
-
-
-typedef unsigned char byte;
-typedef unsigned short word;
-typedef unsigned long dword;
-
-typedef struct readblock_crap readblock_crap;
-
-struct readblock_crap {
- unsigned char *sourcebuf;
- unsigned char *sourcepos;
- unsigned char *sourceend;
- int rembits;
-};
-
-
-static int readblock(DUMBFILE *f, readblock_crap * crap)
-{
- long size;
- int c;
-
- size = dumbfile_igetw(f);
- if (size < 0)
- return size;
-
- crap->sourcebuf = malloc(size);
- if (!crap->sourcebuf)
- return -1;
-
- c = dumbfile_getnc((char *)crap->sourcebuf, size, f);
- if (c < size) {
- free(crap->sourcebuf);
- crap->sourcebuf = NULL;
- return -1;
- }
-
- crap->sourcepos = crap->sourcebuf;
- crap->sourceend = crap->sourcebuf + size;
- crap->rembits = 8;
- return 0;
-}
-
-
-
-static void freeblock(readblock_crap * crap)
-{
- free(crap->sourcebuf);
- crap->sourcebuf = NULL;
-}
-
-
-
-static int readbits(int bitwidth, readblock_crap * crap)
-{
- int val = 0;
- int b = 0;
-
- if (crap->sourcepos >= crap->sourceend) return val;
-
- while (bitwidth > crap->rembits) {
- val |= *crap->sourcepos++ << b;
- if (crap->sourcepos >= crap->sourceend) return val;
- b += crap->rembits;
- bitwidth -= crap->rembits;
- crap->rembits = 8;
- }
-
- val |= (*crap->sourcepos & ((1 << bitwidth) - 1)) << b;
- *crap->sourcepos >>= bitwidth;
- crap->rembits -= bitwidth;
-
- return val;
-}
-
-
-
-/** WARNING - do we even need to pass `right`? */
-/** WARNING - why bother memsetting at all? The whole array is written... */
-// if we do memset, dumb_silence() would be neater...
-static int decompress8(DUMBFILE *f, signed char *data, int len, int it215)
-{
- int blocklen, blockpos;
- byte bitwidth;
- word val;
- char d1, d2;
- readblock_crap crap;
-
- memset(&crap, 0, sizeof(crap));
-
- memset(data, 0, len * sizeof(*data));
-
- while (len > 0) {
- //Read a block of compressed data:
- if (readblock(f, &crap))
- return -1;
- //Set up a few variables
- blocklen = (len < 0x8000) ? len : 0x8000; //Max block length is 0x8000 bytes
- blockpos = 0;
- bitwidth = 9;
- d1 = d2 = 0;
- //Start the decompression:
- while (blockpos < blocklen) {
- //Read a value:
- val = (word)readbits(bitwidth, &crap);
- //Check for bit width change:
-
- if (bitwidth < 7) { //Method 1:
- if (val == (1 << (bitwidth - 1))) {
- val = (word)readbits(3, &crap) + 1;
- bitwidth = (val < bitwidth) ? val : val + 1;
- continue;
- }
- }
- else if (bitwidth < 9) { //Method 2
- byte border = (0xFF >> (9 - bitwidth)) - 4;
-
- if (val > border && val <= (border + 8)) {
- val -= border;
- bitwidth = (val < bitwidth) ? val : val + 1;
- continue;
- }
- }
- else if (bitwidth == 9) { //Method 3
- if (val & 0x100) {
- bitwidth = (val + 1) & 0xFF;
- continue;
- }
- }
- else { //Illegal width, abort ?
- freeblock(&crap);
- return -1;
- }
-
- //Expand the value to signed byte:
- {
- char v; //The sample value:
- if (bitwidth < 8) {
- byte shift = 8 - bitwidth;
- v = (val << shift);
- v >>= shift;
- }
- else
- v = (char)val;
-
- //And integrate the sample value
- //(It always has to end with integration doesn't it ? ;-)
- d1 += v;
- d2 += d1;
- }
-
- //Store !
- /* Version 2.15 was an unofficial version with hacked compression
- * code. Yay, better compression :D
- */
- *data++ = it215 ? d2 : d1;
- len--;
- blockpos++;
- }
- freeblock(&crap);
- }
- return 0;
-}
-
-
-
-static int decompress16(DUMBFILE *f, short *data, int len, int it215)
-{
- int blocklen, blockpos;
- byte bitwidth;
- long val;
- short d1, d2;
- readblock_crap crap;
-
- memset(&crap, 0, sizeof(crap));
-
- memset(data, 0, len * sizeof(*data));
-
- while (len > 0) {
- //Read a block of compressed data:
- if (readblock(f, &crap))
- return -1;
- //Set up a few variables
- blocklen = (len < 0x4000) ? len : 0x4000; // Max block length is 0x4000 bytes
- blockpos = 0;
- bitwidth = 17;
- d1 = d2 = 0;
- //Start the decompression:
- while (blockpos < blocklen) {
- val = readbits(bitwidth, &crap);
- //Check for bit width change:
-
- if (bitwidth < 7) { //Method 1:
- if (val == (1 << (bitwidth - 1))) {
- val = readbits(4, &crap) + 1;
- bitwidth = (val < bitwidth) ? val : val + 1;
- continue;
- }
- }
- else if (bitwidth < 17) { //Method 2
- word border = (0xFFFF >> (17 - bitwidth)) - 8;
-
- if (val > border && val <= (border + 16)) {
- val -= border;
- bitwidth = val < bitwidth ? val : val + 1;
- continue;
- }
- }
- else if (bitwidth == 17) { //Method 3
- if (val & 0x10000) {
- bitwidth = (val + 1) & 0xFF;
- continue;
- }
- }
- else { //Illegal width, abort ?
- freeblock(&crap);
- return -1;
- }
-
- //Expand the value to signed byte:
- {
- short v; //The sample value:
- if (bitwidth < 16) {
- byte shift = 16 - bitwidth;
- v = (short)(val << shift);
- v >>= shift;
- }
- else
- v = (short)val;
-
- //And integrate the sample value
- //(It always has to end with integration doesn't it ? ;-)
- d1 += v;
- d2 += d1;
- }
-
- //Store !
- /* Version 2.15 was an unofficial version with hacked compression
- * code. Yay, better compression :D
- */
- *data++ = it215 ? d2 : d1;
- len--;
- blockpos++;
- }
- freeblock(&crap);
- }
- return 0;
-}
-
-
-
-static int it_read_envelope(IT_ENVELOPE *envelope, DUMBFILE *f)
-{
- int n;
-
- envelope->flags = dumbfile_getc(f);
- envelope->n_nodes = dumbfile_getc(f);
- envelope->loop_start = dumbfile_getc(f);
- envelope->loop_end = dumbfile_getc(f);
- envelope->sus_loop_start = dumbfile_getc(f);
- envelope->sus_loop_end = dumbfile_getc(f);
- for (n = 0; n < envelope->n_nodes; n++) {
- envelope->node_y[n] = dumbfile_getc(f);
- envelope->node_t[n] = dumbfile_igetw(f);
- }
- dumbfile_skip(f, 75 - envelope->n_nodes * 3 + 1);
-
- if (envelope->n_nodes <= 0)
- envelope->flags &= ~IT_ENVELOPE_ON;
- else {
- if (envelope->loop_end >= envelope->n_nodes || envelope->loop_start > envelope->loop_end) envelope->flags &= ~IT_ENVELOPE_LOOP_ON;
- if (envelope->sus_loop_end >= envelope->n_nodes || envelope->sus_loop_start > envelope->sus_loop_end) envelope->flags &= ~IT_ENVELOPE_SUSTAIN_LOOP;
- }
-
- return dumbfile_error(f);
-}
-
-
-
-static int it_read_old_instrument(IT_INSTRUMENT *instrument, DUMBFILE *f)
-{
- int n;
-
- /*if (dumbfile_mgetl(f) != IT_INSTRUMENT_SIGNATURE)
- return -1;*/
- // XXX
- dumbfile_skip(f, 4);
-
- dumbfile_getnc(instrument->filename, 13, f);
- instrument->filename[13] = 0;
-
- instrument->volume_envelope.flags = dumbfile_getc(f);
- instrument->volume_envelope.loop_start = dumbfile_getc(f);
- instrument->volume_envelope.loop_end = dumbfile_getc(f);
- instrument->volume_envelope.sus_loop_start = dumbfile_getc(f);
- instrument->volume_envelope.sus_loop_end = dumbfile_getc(f);
-
- /* Skip two unused bytes. */
- dumbfile_skip(f, 2);
-
- /* In the old instrument format, fadeout ranges from 0 to 64, and is
- * subtracted at intervals from a value starting at 512. In the new
- * format, all these values are doubled. Therefore we double when loading
- * from the old instrument format - that way we don't have to think about
- * it later.
- */
- instrument->fadeout = dumbfile_igetw(f) << 1;
- instrument->new_note_action = dumbfile_getc(f);
- instrument->dup_check_type = dumbfile_getc(f);
- instrument->dup_check_action = DCA_NOTE_CUT; // This might be wrong!
- /** WARNING - what is the duplicate check action for old-style instruments? */
-
- /* Skip Tracker Version and Number of Samples. These are only used in
- * separate instrument files. Also skip unused byte.
- */
- dumbfile_skip(f, 4);
-
- dumbfile_getnc(instrument->name, 26, f);
- instrument->name[26] = 0;
-
- /* Skip unused bytes following the Instrument Name. */
- dumbfile_skip(f, 6);
-
- instrument->pp_separation = 0;
- instrument->pp_centre = 60;
- instrument->global_volume = 128;
- /** WARNING - should global_volume be 64 or something? */
- instrument->default_pan = 32;
- /** WARNING - should default_pan be 128, meaning don`t use? */
- instrument->random_volume = 0;
- instrument->random_pan = 0;
-
- for (n = 0; n < 120; n++) {
- instrument->map_note[n] = dumbfile_getc(f);
- instrument->map_sample[n] = dumbfile_getc(f);
- }
-
- /* Skip "Volume envelope (200 bytes)". */
- // - need to know better what this is for though.
- dumbfile_skip(f, 200);
-
-#ifdef INVESTIGATE_OLD_INSTRUMENTS
- fprintf(stderr, "Inst %02d Env:", n);
-#endif
-
- for (n = 0; n < 25; n++)
- {
- instrument->volume_envelope.node_t[n] = dumbfile_getc(f);
- instrument->volume_envelope.node_y[n] = dumbfile_getc(f);
-
-#ifdef INVESTIGATE_OLD_INSTRUMENTS
- fprintf(stderr, " %d,%d",
- instrument->volume_envelope.node_t[n],
- instrument->volume_envelope.node_y[n]);
-#endif
-
- // This loop is unfinished, as we can probably escape from it before
- // the end if we want to. Hence the otherwise useless dumbfile_skip()
- // call below.
- }
- dumbfile_skip(f, 50 - (n << 1));
- instrument->volume_envelope.n_nodes = n;
-
-#ifdef INVESTIGATE_OLD_INSTRUMENTS
- fprintf(stderr, "\n");
-#endif
-
- if (dumbfile_error(f))
- return -1;
-
- {
- IT_ENVELOPE *envelope = &instrument->volume_envelope;
- if (envelope->n_nodes <= 0)
- envelope->flags &= ~IT_ENVELOPE_ON;
- else {
- if (envelope->loop_end >= envelope->n_nodes || envelope->loop_start > envelope->loop_end) envelope->flags &= ~IT_ENVELOPE_LOOP_ON;
- if (envelope->sus_loop_end >= envelope->n_nodes || envelope->sus_loop_start > envelope->sus_loop_end) envelope->flags &= ~IT_ENVELOPE_SUSTAIN_LOOP;
- }
- }
-
- instrument->filter_cutoff = 127;
- instrument->filter_resonance = 0;
-
- instrument->pan_envelope.flags = 0;
- instrument->pitch_envelope.flags = 0;
-
- return 0;
-}
-
-
-
-static int it_read_instrument(IT_INSTRUMENT *instrument, DUMBFILE *f, int maxlen)
-{
- int n, len;
-
- /*if (dumbfile_mgetl(f) != IT_INSTRUMENT_SIGNATURE)
- return -1;*/
- // XXX
-
- if (maxlen) len = dumbfile_pos(f);
-
- dumbfile_skip(f, 4);
-
- dumbfile_getnc(instrument->filename, 13, f);
- instrument->filename[13] = 0;
-
- instrument->new_note_action = dumbfile_getc(f);
- instrument->dup_check_type = dumbfile_getc(f);
- instrument->dup_check_action = dumbfile_getc(f);
- instrument->fadeout = dumbfile_igetw(f);
- instrument->pp_separation = dumbfile_getc(f);
- instrument->pp_centre = dumbfile_getc(f);
- instrument->global_volume = dumbfile_getc(f);
- instrument->default_pan = dumbfile_getc(f);
- instrument->random_volume = dumbfile_getc(f);
- instrument->random_pan = dumbfile_getc(f);
-
- /* Skip Tracker Version and Number of Samples. These are only used in
- * separate instrument files. Also skip unused byte.
- */
- dumbfile_skip(f, 4);
-
- dumbfile_getnc(instrument->name, 26, f);
- instrument->name[26] = 0;
-
- instrument->filter_cutoff = dumbfile_getc(f);
- instrument->filter_resonance = dumbfile_getc(f);
-
- /* Skip MIDI Channel, Program and Bank. */
- //dumbfile_skip(f, 4);
- /*instrument->output = dumbfile_getc(f);
- if ( instrument->output > 16 ) {
- instrument->output -= 128;
- } else {
- instrument->output = 0;
- }
- dumbfile_skip(f, 3);*/
- dumbfile_skip(f, 4);
-
- for (n = 0; n < 120; n++) {
- instrument->map_note[n] = dumbfile_getc(f);
- instrument->map_sample[n] = dumbfile_getc(f);
- }
-
- if (dumbfile_error(f))
- return -1;
-
- if (it_read_envelope(&instrument->volume_envelope, f)) return -1;
- if (it_read_envelope(&instrument->pan_envelope, f)) return -1;
- if (it_read_envelope(&instrument->pitch_envelope, f)) return -1;
-
- if (maxlen) {
- len = dumbfile_pos(f) - len;
- if ( maxlen - len < 124 ) return 0;
- }
-
- if ( dumbfile_mgetl(f) == IT_MPTX_SIGNATURE ) {
- for ( n = 0; n < 120; n++ ) {
- instrument->map_sample[ n ] += dumbfile_getc( f ) << 8;
- }
-
- if (dumbfile_error(f))
- return -1;
- }
-
- /*if ( dumbfile_mgetl(f) == IT_INSM_SIGNATURE ) {
- long end = dumbfile_igetl(f);
- end += dumbfile_pos(f);
- while ( dumbfile_pos(f) < end ) {
- int chunkid = dumbfile_igetl(f);
- switch ( chunkid ) {
- case DUMB_ID('P','L','U','G'):
- instrument->output = dumbfile_getc(f);
- break;
- default:
- chunkid = chunkid / 0x100 + dumbfile_getc(f) * 0x1000000;
- break;
- }
- }
-
- if (dumbfile_error(f))
- return -1;
- }*/
-
- return 0;
-}
-
-
-
-static int it_read_sample_header(IT_SAMPLE *sample, unsigned char *convert, long *offset, DUMBFILE *f)
-{
- /* XXX
- if (dumbfile_mgetl(f) != IT_SAMPLE_SIGNATURE)
- return -1;*/
- int hax = 0;
- long s = dumbfile_mgetl(f);
- if (s != IT_SAMPLE_SIGNATURE) {
- if ( s == ( IT_SAMPLE_SIGNATURE >> 16 ) ) {
- s <<= 16;
- s |= dumbfile_mgetw(f);
- if ( s != IT_SAMPLE_SIGNATURE )
- return -1;
- hax = 1;
- }
- }
-
- dumbfile_getnc(sample->filename, 13, f);
- sample->filename[13] = 0;
-
- sample->global_volume = dumbfile_getc(f);
- sample->flags = dumbfile_getc(f);
- sample->default_volume = dumbfile_getc(f);
-
- dumbfile_getnc(sample->name, 26, f);
- sample->name[26] = 0;
-
- *convert = dumbfile_getc(f);
- sample->default_pan = dumbfile_getc(f);
- sample->length = dumbfile_igetl(f);
- sample->loop_start = dumbfile_igetl(f);
- sample->loop_end = dumbfile_igetl(f);
- sample->C5_speed = dumbfile_igetl(f);
- sample->sus_loop_start = dumbfile_igetl(f);
- sample->sus_loop_end = dumbfile_igetl(f);
-
-#ifdef STEREO_SAMPLES_COUNT_AS_TWO
- if (sample->flags & IT_SAMPLE_STEREO) {
- sample->length >>= 1;
- sample->loop_start >>= 1;
- sample->loop_end >>= 1;
- sample->C5_speed >>= 1;
- sample->sus_loop_start >>= 1;
- sample->sus_loop_end >>= 1;
- }
-#endif
-
- if (sample->flags & IT_SAMPLE_EXISTS) {
- if (sample->length <= 0)
- sample->flags &= ~IT_SAMPLE_EXISTS;
- else {
- if ((unsigned int)sample->loop_end > (unsigned int)sample->length)
- sample->flags &= ~IT_SAMPLE_LOOP;
- else if ((unsigned int)sample->loop_start >= (unsigned int)sample->loop_end)
- sample->flags &= ~IT_SAMPLE_LOOP;
-
- if ((unsigned int)sample->sus_loop_end > (unsigned int)sample->length)
- sample->flags &= ~IT_SAMPLE_SUS_LOOP;
- else if ((unsigned int)sample->sus_loop_start >= (unsigned int)sample->sus_loop_end)
- sample->flags &= ~IT_SAMPLE_SUS_LOOP;
-
- /* We may be able to truncate the sample to save memory. */
- if (sample->flags & IT_SAMPLE_LOOP &&
- *convert != 0xFF) { /* not truncating compressed samples, for now... */
- if ((sample->flags & IT_SAMPLE_SUS_LOOP) && sample->sus_loop_end >= sample->loop_end)
- sample->length = sample->sus_loop_end;
- else
- sample->length = sample->loop_end;
- }
- }
- }
-
- *offset = dumbfile_igetl(f);
-
- sample->vibrato_speed = dumbfile_getc(f);
- sample->vibrato_depth = dumbfile_getc(f);
- if ( ! hax ) {
- sample->vibrato_rate = dumbfile_getc(f);
- sample->vibrato_waveform = dumbfile_getc(f);
- } else {
- sample->vibrato_rate = 0;
- sample->vibrato_waveform = 0;
- }
- sample->finetune = 0;
- sample->max_resampling_quality = -1;
-
- return dumbfile_error(f);
-}
-
-long _dumb_it_read_sample_data_adpcm4(IT_SAMPLE *sample, DUMBFILE *f)
-{
- long n, len, delta;
- signed char * ptr, * end;
- signed char compression_table[16];
- if (dumbfile_getnc(compression_table, 16, f) != 16)
- return -1;
- ptr = (signed char *) sample->data;
- delta = 0;
-
- end = ptr + sample->length;
- len = (sample->length + 1) / 2;
- for (n = 0; n < len; n++) {
- int b = dumbfile_getc(f);
- if (b < 0) return -1;
- delta += compression_table[b & 0x0F];
- *ptr++ = delta;
- if (ptr >= end) break;
- delta += compression_table[b >> 4];
- *ptr++ = delta;
- }
-
- return 0;
-}
-
-
-static long it_read_sample_data(int cmwt, IT_SAMPLE *sample, unsigned char convert, DUMBFILE *f)
-{
- long n;
-
- long datasize = sample->length;
- if (sample->flags & IT_SAMPLE_STEREO) datasize <<= 1;
-
- sample->data = malloc(datasize * (sample->flags & IT_SAMPLE_16BIT ? 2 : 1));
- if (!sample->data)
- return -1;
-
- if (!(sample->flags & IT_SAMPLE_16BIT) && (convert == 0xFF)) {
- if (_dumb_it_read_sample_data_adpcm4(sample, f) < 0)
- return -1;
- } else if (sample->flags & 8) {
- /* If the sample is packed, then we must unpack it. */
-
- /** WARNING - unresolved business here... test with ModPlug? */
-
- if (sample->flags & IT_SAMPLE_STEREO)
- //exit(37); // TODO: if this ever happens, maybe sample->length should be doubled below?
- return -1;
-
-/*
-//#ifndef STEREO_SAMPLES_COUNT_AS_TWO
- ASSERT(!(sample->flags & IT_SAMPLE_STEREO));
-//#endif
-*/
- if (sample->flags & IT_SAMPLE_16BIT)
- decompress16(f, sample->data, datasize, ((cmwt >= 0x215) && (convert & 4)));
- else
- decompress8(f, sample->data, datasize, ((cmwt >= 0x215) && (convert & 4)));
- } else if (sample->flags & IT_SAMPLE_16BIT) {
- if (convert & 2)
- for (n = 0; n < datasize; n++)
- ((short *)sample->data)[n] = dumbfile_mgetw(f);
- else
- for (n = 0; n < datasize; n++)
- ((short *)sample->data)[n] = dumbfile_igetw(f);
- } else
- for (n = 0; n < datasize; n++)
- ((signed char *)sample->data)[n] = dumbfile_getc(f);
-
- if (dumbfile_error(f))
- return -1;
-
- if (!(convert & 1)) {
- /* Convert to signed. */
- if (sample->flags & IT_SAMPLE_16BIT)
- for (n = 0; n < datasize; n++)
- ((short *)sample->data)[n] ^= 0x8000;
- else
- for (n = 0; n < datasize; n++)
- ((signed char *)sample->data)[n] ^= 0x80;
- }
-
- /* NOT SUPPORTED:
- *
- * convert & 4 - Samples stored as delta values
- * convert & 16 - Samples stored as TX-Wave 12-bit values
- * convert & 32 - Left/Right/All Stereo prompt
- */
-
- return 0;
-}
-
-
-
-//#define DETECT_DUPLICATE_CHANNELS
-#ifdef DETECT_DUPLICATE_CHANNELS
-#include <stdio.h>
-#endif
-static int it_read_pattern(IT_PATTERN *pattern, DUMBFILE *f, unsigned char *buffer)
-{
- unsigned char cmask[DUMB_IT_N_CHANNELS];
- unsigned char cnote[DUMB_IT_N_CHANNELS];
- unsigned char cinstrument[DUMB_IT_N_CHANNELS];
- unsigned char cvolpan[DUMB_IT_N_CHANNELS];
- unsigned char ceffect[DUMB_IT_N_CHANNELS];
- unsigned char ceffectvalue[DUMB_IT_N_CHANNELS];
-#ifdef DETECT_DUPLICATE_CHANNELS
- IT_ENTRY *dupentry[DUMB_IT_N_CHANNELS];
-#endif
-
- int n_entries = 0;
- int buflen;
- int bufpos = 0;
-
- IT_ENTRY *entry;
-
- unsigned char channel;
- unsigned char mask;
-
- memset(cmask, 0, sizeof(cmask));
- memset(cnote, 0, sizeof(cnote));
- memset(cinstrument, 0, sizeof(cinstrument));
- memset(cvolpan, 0, sizeof(cvolpan));
- memset(ceffect, 0, sizeof(ceffect));
- memset(ceffectvalue, 0, sizeof(ceffectvalue));
-#ifdef DETECT_DUPLICATE_CHANNELS
- {
- int i;
- for (i = 0; i < DUMB_IT_N_CHANNELS; i++) dupentry[i] = NULL;
- }
-#endif
-
- buflen = dumbfile_igetw(f);
- pattern->n_rows = dumbfile_igetw(f);
-
- /* Skip four unused bytes. */
- dumbfile_skip(f, 4);
-
- if (dumbfile_error(f))
- return -1;
-
- /* Read in the pattern data. */
- dumbfile_getnc(buffer, buflen, f);
-
- if (dumbfile_error(f))
- return -1;
-
- /* Scan the pattern data, and work out how many entries we need room for. */
- while (bufpos < buflen) {
- unsigned char b = buffer[bufpos++];
-
- if (b == 0) {
- /* End of row */
- n_entries++;
- continue;
- }
-
- channel = (b - 1) & 63;
-
- if (b & 128)
- cmask[channel] = mask = buffer[bufpos++];
- else
- mask = cmask[channel];
-
- {
- static const unsigned char used[16] = {0, 1, 1, 2, 1, 2, 2, 3, 2, 3, 3, 4, 3, 4, 4, 5};
- n_entries += (mask != 0);
- bufpos += used[mask & 15];
- }
- }
-
- pattern->n_entries = n_entries;
-
- pattern->entry = malloc(n_entries * sizeof(*pattern->entry));
-
- if (!pattern->entry)
- return -1;
-
- bufpos = 0;
- memset(cmask, 0, sizeof(cmask));
-
- entry = pattern->entry;
-
- while (bufpos < buflen) {
- unsigned char b = buffer[bufpos++];
-
- if (b == 0) {
- /* End of row */
- IT_SET_END_ROW(entry);
- entry++;
-#ifdef DETECT_DUPLICATE_CHANNELS
- {
- int i;
- for (i = 0; i < DUMB_IT_N_CHANNELS; i++) dupentry[i] = NULL;
- }
-#endif
- continue;
- }
-
- channel = (b - 1) & 63;
-
- if (b & 128)
- cmask[channel] = mask = buffer[bufpos++];
- else
- mask = cmask[channel];
-
- if (mask) {
- entry->mask = (mask & 15) | (mask >> 4);
- entry->channel = channel;
-
- if (mask & IT_ENTRY_NOTE)
- cnote[channel] = entry->note = buffer[bufpos++];
- else if (mask & (IT_ENTRY_NOTE << 4))
- entry->note = cnote[channel];
-
- if (mask & IT_ENTRY_INSTRUMENT)
- cinstrument[channel] = entry->instrument = buffer[bufpos++];
- else if (mask & (IT_ENTRY_INSTRUMENT << 4))
- entry->instrument = cinstrument[channel];
-
- if (mask & IT_ENTRY_VOLPAN)
- cvolpan[channel] = entry->volpan = buffer[bufpos++];
- else if (mask & (IT_ENTRY_VOLPAN << 4))
- entry->volpan = cvolpan[channel];
-
- if (mask & IT_ENTRY_EFFECT) {
- ceffect[channel] = entry->effect = buffer[bufpos++];
- ceffectvalue[channel] = entry->effectvalue = buffer[bufpos++];
- } else {
- entry->effect = ceffect[channel];
- entry->effectvalue = ceffectvalue[channel];
- }
-
-#ifdef DETECT_DUPLICATE_CHANNELS
- if (dupentry[channel]) {
- FILE *f = fopen("dupentry.txt", "a");
- if (!f) abort();
- fprintf(f, "Two events on channel %d:", channel);
- fprintf(f, " Event #1:");
- if (dupentry[channel]->mask & IT_ENTRY_NOTE ) fprintf(f, " %03d", dupentry[channel]->note ); else fprintf(f, " ...");
- if (dupentry[channel]->mask & IT_ENTRY_INSTRUMENT) fprintf(f, " %03d", dupentry[channel]->instrument); else fprintf(f, " ...");
- if (dupentry[channel]->mask & IT_ENTRY_VOLPAN ) fprintf(f, " %03d", dupentry[channel]->volpan ); else fprintf(f, " ...");
- if (dupentry[channel]->mask & IT_ENTRY_EFFECT) fprintf(f, " %c%02X\n", 'A' - 1 + dupentry[channel]->effect, dupentry[channel]->effectvalue); else fprintf(f, " ...\n");
- fprintf(f, " Event #2:");
- if (entry->mask & IT_ENTRY_NOTE ) fprintf(f, " %03d", entry->note ); else fprintf(f, " ...");
- if (entry->mask & IT_ENTRY_INSTRUMENT) fprintf(f, " %03d", entry->instrument); else fprintf(f, " ...");
- if (entry->mask & IT_ENTRY_VOLPAN ) fprintf(f, " %03d", entry->volpan ); else fprintf(f, " ...");
- if (entry->mask & IT_ENTRY_EFFECT) fprintf(f, " %c%02X\n", 'A' - 1 + entry->effect, entry->effectvalue); else fprintf(f, " ...\n");
- fclose(f);
- }
- dupentry[channel] = entry;
-#endif
-
- entry++;
- }
- }
-
- ASSERT(entry == pattern->entry + n_entries);
-
- return 0;
-}
-
-
-
-/* Currently we assume the sample data are stored after the sample headers in
- * module files. This assumption may be unjustified; let me know if you have
- * trouble.
- */
-
-#define IT_COMPONENT_SONG_MESSAGE 1
-#define IT_COMPONENT_INSTRUMENT 2
-#define IT_COMPONENT_PATTERN 3
-#define IT_COMPONENT_SAMPLE 4
-
-typedef struct IT_COMPONENT
-{
- unsigned char type;
- unsigned short n;
- long offset;
- short sampfirst; /* component[sampfirst] = first sample data after this */
- short sampnext; /* sampnext is used to create linked lists of sample data */
-}
-IT_COMPONENT;
-
-
-
-static int it_component_compare(const void *e1, const void *e2)
-{
- return ((const IT_COMPONENT *)e1)->offset -
- ((const IT_COMPONENT *)e2)->offset;
-}
-
-
-
-static sigdata_t *it_load_sigdata(DUMBFILE *f)
-{
- DUMB_IT_SIGDATA *sigdata;
-
- int cwt, cmwt;
- int special;
- int message_length, message_offset;
-
- IT_COMPONENT *component;
- int n_components = 0;
-
- unsigned char sample_convert[4096];
-
- int n;
-
- unsigned char *buffer;
-
- if (dumbfile_mgetl(f) != IT_SIGNATURE)
- return NULL;
-
- sigdata = malloc(sizeof(*sigdata));
-
- if (!sigdata)
- return NULL;
-
- sigdata->song_message = NULL;
- sigdata->order = NULL;
- sigdata->instrument = NULL;
- sigdata->sample = NULL;
- sigdata->pattern = NULL;
- sigdata->midi = NULL;
- sigdata->checkpoint = NULL;
-
- dumbfile_getnc(sigdata->name, 26, f);
- sigdata->name[26] = 0;
-
- /* Skip pattern row highlight info. */
- dumbfile_skip(f, 2);
-
- sigdata->n_orders = dumbfile_igetw(f);
- sigdata->n_instruments = dumbfile_igetw(f);
- sigdata->n_samples = dumbfile_igetw(f);
- sigdata->n_patterns = dumbfile_igetw(f);
-
- cwt = dumbfile_igetw(f);
- cmwt = dumbfile_igetw(f);
-
- sigdata->flags = dumbfile_igetw(f);
- special = dumbfile_igetw(f);
-
- sigdata->global_volume = dumbfile_getc(f);
- sigdata->mixing_volume = dumbfile_getc(f);
- sigdata->speed = dumbfile_getc(f);
- if (sigdata->speed == 0) sigdata->speed = 6; // Should we? What about tempo?
- sigdata->tempo = dumbfile_getc(f);
- sigdata->pan_separation = dumbfile_getc(f); /** WARNING: use this */
-
- /* Skip Pitch Wheel Depth */
- dumbfile_skip(f, 1);
-
- message_length = dumbfile_igetw(f);
- message_offset = dumbfile_igetl(f);
-
- /* Skip Reserved. */
- dumbfile_skip(f, 4);
-
- dumbfile_getnc(sigdata->channel_pan, DUMB_IT_N_CHANNELS, f);
- dumbfile_getnc(sigdata->channel_volume, DUMB_IT_N_CHANNELS, f);
-
- // XXX sample count
- if (dumbfile_error(f) || sigdata->n_orders <= 0 || sigdata->n_instruments > 256 || sigdata->n_samples > 4000 || sigdata->n_patterns > 256) {
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- sigdata->order = malloc(sigdata->n_orders);
- if (!sigdata->order) {
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- if (sigdata->n_instruments) {
- sigdata->instrument = malloc(sigdata->n_instruments * sizeof(*sigdata->instrument));
- if (!sigdata->instrument) {
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- }
-
- if (sigdata->n_samples) {
- sigdata->sample = malloc(sigdata->n_samples * sizeof(*sigdata->sample));
- if (!sigdata->sample) {
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- for (n = 0; n < sigdata->n_samples; n++)
- sigdata->sample[n].data = NULL;
- }
-
- if (sigdata->n_patterns) {
- sigdata->pattern = malloc(sigdata->n_patterns * sizeof(*sigdata->pattern));
- if (!sigdata->pattern) {
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- for (n = 0; n < sigdata->n_patterns; n++)
- sigdata->pattern[n].entry = NULL;
- }
-
- dumbfile_getnc(sigdata->order, sigdata->n_orders, f);
- sigdata->restart_position = 0;
-
- component = malloc(769 * sizeof(*component));
- if (!component) {
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- if (special & 1) {
- component[n_components].type = IT_COMPONENT_SONG_MESSAGE;
- component[n_components].offset = message_offset;
- component[n_components].sampfirst = -1;
- n_components++;
- }
-
- for (n = 0; n < sigdata->n_instruments; n++) {
- component[n_components].type = IT_COMPONENT_INSTRUMENT;
- component[n_components].n = n;
- component[n_components].offset = dumbfile_igetl(f);
- component[n_components].sampfirst = -1;
- n_components++;
- }
-
- for (n = 0; n < sigdata->n_samples; n++) {
- component[n_components].type = IT_COMPONENT_SAMPLE;
- component[n_components].n = n;
- component[n_components].offset = dumbfile_igetl(f);
- component[n_components].sampfirst = -1;
- n_components++;
- }
-
- for (n = 0; n < sigdata->n_patterns; n++) {
- long offset = dumbfile_igetl(f);
- if (offset) {
- component[n_components].type = IT_COMPONENT_PATTERN;
- component[n_components].n = n;
- component[n_components].offset = offset;
- component[n_components].sampfirst = -1;
- n_components++;
- } else {
- /* Empty 64-row pattern */
- sigdata->pattern[n].n_rows = 64;
- sigdata->pattern[n].n_entries = 0;
- }
- }
-
- if (dumbfile_error(f)) {
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- /*
- if (!(sigdata->flags & 128) != !(special & 8)) {
- fprintf(stderr, "Flags Bit 7 (\"Request embedded MIDI configuration\"): %s\n", sigdata->flags & 128 ? "=SET=" : "clear");
- fprintf(stderr, "Special Bit 3 (\"MIDI configuration embedded\") : %s\n", special & 8 ? "=SET=" : "clear");
- fprintf(stderr, "entheh would like to investigate this IT file.\n");
- fprintf(stderr, "Please contact him! entheh@users.sf.net\n");
- }
- */
-
- if (special & 8) {
- /* MIDI configuration is embedded. */
- unsigned char mididata[32];
- int i;
- sigdata->midi = malloc(sizeof(*sigdata->midi));
- if (!sigdata->midi) {
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- // Should we be happy with this outcome in some situations?
- }
- // What are we skipping?
- i = dumbfile_igetw(f);
- if (dumbfile_error(f) || dumbfile_skip(f, 8*i)) {
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- /* Read embedded MIDI configuration */
- // What are the first 9 commands for?
- if (dumbfile_skip(f, 32*9)) {
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- for (i = 0; i < 16; i++) {
- unsigned char len = 0;
- int j, leftdigit = -1;
- if (dumbfile_getnc(mididata, 32, f) < 32) {
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- sigdata->midi->SFmacroz[i] = 0;
- for (j = 0; j < 32; j++) {
- if (leftdigit >= 0) {
- if (mididata[j] == 0) {
- sigdata->midi->SFmacro[i][len++] = leftdigit;
- break;
- } else if (mididata[j] == ' ')
- sigdata->midi->SFmacro[i][len++] = leftdigit;
- else if (mididata[j] >= '0' && mididata[j] <= '9')
- sigdata->midi->SFmacro[i][len++] = (leftdigit << 4) | (mididata[j] - '0');
- else if (mididata[j] >= 'A' && mididata[j] <= 'F')
- sigdata->midi->SFmacro[i][len++] = (leftdigit << 4) | (mididata[j] - 'A' + 0xA);
- leftdigit = -1;
- } else if (mididata[j] == 0)
- break;
- else if (mididata[j] == 'z')
- sigdata->midi->SFmacroz[i] |= 1 << len++;
- else if (mididata[j] >= '0' && mididata[j] <= '9')
- leftdigit = mididata[j] - '0';
- else if (mididata[j] >= 'A' && mididata[j] <= 'F')
- leftdigit = mididata[j] - 'A' + 0xA;
- }
- sigdata->midi->SFmacrolen[i] = len;
- }
- for (i = 0; i < 128; i++) {
- unsigned char len = 0;
- int j, leftdigit = -1;
- dumbfile_getnc(mididata, 32, f);
- for (j = 0; j < 32; j++) {
- if (leftdigit >= 0) {
- if (mididata[j] == 0) {
- sigdata->midi->Zmacro[i][len++] = leftdigit;
- break;
- } else if (mididata[j] == ' ')
- sigdata->midi->Zmacro[i][len++] = leftdigit;
- else if (mididata[j] >= '0' && mididata[j] <= '9')
- sigdata->midi->Zmacro[i][len++] = (leftdigit << 4) | (mididata[j] - '0');
- else if (mididata[j] >= 'A' && mididata[j] <= 'F')
- sigdata->midi->Zmacro[i][len++] = (leftdigit << 4) | (mididata[j] - 'A' + 0xA);
- leftdigit = -1;
- } else if (mididata[j] == 0)
- break;
- else if (mididata[j] >= '0' && mididata[j] <= '9')
- leftdigit = mididata[j] - '0';
- else if (mididata[j] >= 'A' && mididata[j] <= 'F')
- leftdigit = mididata[j] - 'A' + 0xA;
- }
- sigdata->midi->Zmacrolen[i] = len;
- }
- }
-
- sigdata->flags &= IT_REAL_FLAGS;
-
- qsort(component, n_components, sizeof(IT_COMPONENT), &it_component_compare);
-
- buffer = malloc(65536);
- if (!buffer) {
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- for (n = 0; n < n_components; n++) {
- long offset;
- int m;
-
- /* XXX */
- if ( component[n].offset == 0 ) {
- switch (component[n].type) {
- case IT_COMPONENT_INSTRUMENT:
- memset( &sigdata->instrument[component[n].n], 0, sizeof(IT_INSTRUMENT) );
- break;
- case IT_COMPONENT_SAMPLE:
- memset( &sigdata->sample[component[n].n], 0, sizeof(IT_SAMPLE) );
- break;
- case IT_COMPONENT_PATTERN:
- {
- IT_PATTERN * p = &sigdata->pattern[component[n].n];
- p->entry = 0;
- p->n_rows = 64;
- p->n_entries = 0;
- }
- break;
- }
- continue;
- }
-
- if (it_seek(f, component[n].offset)) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- switch (component[n].type) {
-
- case IT_COMPONENT_SONG_MESSAGE:
- if ( n < n_components ) {
- message_length = min( message_length, component[n+1].offset - component[n].offset );
- }
- sigdata->song_message = malloc(message_length + 1);
- if (sigdata->song_message) {
- if (dumbfile_getnc(sigdata->song_message, message_length, f) < message_length) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- sigdata->song_message[message_length] = 0;
- }
- break;
-
- case IT_COMPONENT_INSTRUMENT:
- if (cmwt < 0x200)
- m = it_read_old_instrument(&sigdata->instrument[component[n].n], f);
- else
- m = it_read_instrument(&sigdata->instrument[component[n].n], f, (n + 1 < n_components) ? (component[n+1].offset - component[n].offset) : 0);
-
- if (m) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- break;
-
- case IT_COMPONENT_PATTERN:
- if (it_read_pattern(&sigdata->pattern[component[n].n], f, buffer)) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
- break;
-
- case IT_COMPONENT_SAMPLE:
- if (it_read_sample_header(&sigdata->sample[component[n].n], &sample_convert[component[n].n], &offset, f)) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- if (sigdata->sample[component[n].n].flags & IT_SAMPLE_EXISTS) {
- short *sample;
-
- for (m = n + 1; m < n_components; m++)
- if (component[m].offset > offset)
- break;
- m--;
-
- sample = &component[m].sampfirst;
-
- while (*sample >= 0 && component[*sample].offset <= offset)
- sample = &component[*sample].sampnext;
-
- component[n].sampnext = *sample;
- *sample = n;
-
- component[n].offset = offset;
- }
- }
-
- m = component[n].sampfirst;
-
- while (m >= 0) {
- if (it_seek(f, component[m].offset)) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- if (it_read_sample_data(cmwt, &sigdata->sample[component[m].n], sample_convert[component[m].n], f)) {
- free(buffer);
- free(component);
- _dumb_it_unload_sigdata(sigdata);
- return NULL;
- }
-
- m = component[m].sampnext;
- }
- }
-
- free(buffer);
- free(component);
-
- _dumb_it_fix_invalid_orders(sigdata);
-
- return sigdata;
-}
-
-
-
-DUH *dumb_read_it_quick(DUMBFILE *f)
-{
- sigdata_t *sigdata;
-
- DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
-
- sigdata = it_load_sigdata(f);
-
- if (!sigdata)
- return NULL;
-
- {
- const char *tag[1][2];
- tag[0][0] = "TITLE";
- tag[0][1] = ((DUMB_IT_SIGDATA *)sigdata)->name;
- return make_duh(-1, 1, (const char *const (*)[2])tag, 1, &descptr, &sigdata);
- }
-}
+/* _______ ____ __ ___ ___
+ * \ _ \ \ / \ / \ \ / / ' ' '
+ * | | \ \ | | || | \/ | . .
+ * | | | | | | || ||\ /| |
+ * | | | | | | || || \/ | | ' ' '
+ * | | | | | | || || | | . .
+ * | |_/ / \ \__// || | |
+ * /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
+ * / \
+ * / . \
+ * itread.c - Code to read an Impulse Tracker / / \ \
+ * module from an open file. | < / \_
+ * | \/ /\ /
+ * Based on the loader from an IT player by Bob. \_ / > /
+ * Adapted for DUMB by entheh. | \ / /
+ * | ' /
+ * \__/
+ */
+
+#include <stdlib.h>
+#include <string.h>//might not be necessary later; required for memset
+
+#include "dumb.h"
+#include "internal/it.h"
+
+
+
+#define INVESTIGATE_OLD_INSTRUMENTS
+
+
+
+static int it_seek(DUMBFILE *f, long offset)
+{
+ long pos = dumbfile_pos(f);
+
+ if (pos > offset)
+ return -1;
+
+ if (pos < offset)
+ if (dumbfile_skip(f, offset - pos))
+ return -1;
+
+ return 0;
+}
+
+
+
+typedef unsigned char byte;
+typedef unsigned short word;
+typedef unsigned long dword;
+
+typedef struct readblock_crap readblock_crap;
+
+struct readblock_crap {
+ unsigned char *sourcebuf;
+ unsigned char *sourcepos;
+ unsigned char *sourceend;
+ int rembits;
+};
+
+
+static int readblock(DUMBFILE *f, readblock_crap * crap)
+{
+ long size;
+ int c;
+
+ size = dumbfile_igetw(f);
+ if (size < 0)
+ return size;
+
+ crap->sourcebuf = malloc(size);
+ if (!crap->sourcebuf)
+ return -1;
+
+ c = dumbfile_getnc((char *)crap->sourcebuf, size, f);
+ if (c < size) {
+ free(crap->sourcebuf);
+ crap->sourcebuf = NULL;
+ return -1;
+ }
+
+ crap->sourcepos = crap->sourcebuf;
+ crap->sourceend = crap->sourcebuf + size;
+ crap->rembits = 8;
+ return 0;
+}
+
+
+
+static void freeblock(readblock_crap * crap)
+{
+ free(crap->sourcebuf);
+ crap->sourcebuf = NULL;
+}
+
+
+
+static int readbits(int bitwidth, readblock_crap * crap)
+{
+ int val = 0;
+ int b = 0;
+
+ if (crap->sourcepos >= crap->sourceend) return val;
+
+ while (bitwidth > crap->rembits) {
+ val |= *crap->sourcepos++ << b;
+ if (crap->sourcepos >= crap->sourceend) return val;
+ b += crap->rembits;
+ bitwidth -= crap->rembits;
+ crap->rembits = 8;
+ }
+
+ val |= (*crap->sourcepos & ((1 << bitwidth) - 1)) << b;
+ *crap->sourcepos >>= bitwidth;
+ crap->rembits -= bitwidth;
+
+ return val;
+}
+
+
+
+/** WARNING - do we even need to pass `right`? */
+/** WARNING - why bother memsetting at all? The whole array is written... */
+// if we do memset, dumb_silence() would be neater...
+static int decompress8(DUMBFILE *f, signed char *data, int len, int cmwt)
+{
+ int blocklen, blockpos;
+ byte bitwidth;
+ word val;
+ char d1, d2;
+ readblock_crap crap;
+
+ memset(&crap, 0, sizeof(crap));
+
+ memset(data, 0, len * sizeof(*data));
+
+ while (len > 0) {
+ //Read a block of compressed data:
+ if (readblock(f, &crap))
+ return -1;
+ //Set up a few variables
+ blocklen = (len < 0x8000) ? len : 0x8000; //Max block length is 0x8000 bytes
+ blockpos = 0;
+ bitwidth = 9;
+ d1 = d2 = 0;
+ //Start the decompression:
+ while (blockpos < blocklen) {
+ //Read a value:
+ val = (word)readbits(bitwidth, &crap);
+ //Check for bit width change:
+
+ if (bitwidth < 7) { //Method 1:
+ if (val == (1 << (bitwidth - 1))) {
+ val = (word)readbits(3, &crap) + 1;
+ bitwidth = (val < bitwidth) ? val : val + 1;
+ continue;
+ }
+ }
+ else if (bitwidth < 9) { //Method 2
+ byte border = (0xFF >> (9 - bitwidth)) - 4;
+
+ if (val > border && val <= (border + 8)) {
+ val -= border;
+ bitwidth = (val < bitwidth) ? val : val + 1;
+ continue;
+ }
+ }
+ else if (bitwidth == 9) { //Method 3
+ if (val & 0x100) {
+ bitwidth = (val + 1) & 0xFF;
+ continue;
+ }
+ }
+ else { //Illegal width, abort ?
+ freeblock(&crap);
+ return -1;
+ }
+
+ //Expand the value to signed byte:
+ {
+ char v; //The sample value:
+ if (bitwidth < 8) {
+ byte shift = 8 - bitwidth;
+ v = (val << shift);
+ v >>= shift;
+ }
+ else
+ v = (char)val;
+
+ //And integrate the sample value
+ //(It always has to end with integration doesn't it ? ;-)
+ d1 += v;
+ d2 += d1;
+ }
+
+ //Store !
+ /* Version 2.15 was an unofficial version with hacked compression
+ * code. Yay, better compression :D
+ */
+ *data++ = cmwt == 0x215 ? d2 : d1;
+ len--;
+ blockpos++;
+ }
+ freeblock(&crap);
+ }
+ return 0;
+}
+
+
+
+static int decompress16(DUMBFILE *f, short *data, int len, int cmwt)
+{
+ int blocklen, blockpos;
+ byte bitwidth;
+ long val;
+ short d1, d2;
+ readblock_crap crap;
+
+ memset(&crap, 0, sizeof(crap));
+
+ memset(data, 0, len * sizeof(*data));
+
+ while (len > 0) {
+ //Read a block of compressed data:
+ if (readblock(f, &crap))
+ return -1;
+ //Set up a few variables
+ blocklen = (len < 0x4000) ? len : 0x4000; // Max block length is 0x4000 bytes
+ blockpos = 0;
+ bitwidth = 17;
+ d1 = d2 = 0;
+ //Start the decompression:
+ while (blockpos < blocklen) {
+ val = readbits(bitwidth, &crap);
+ //Check for bit width change:
+
+ if (bitwidth < 7) { //Method 1:
+ if (val == (1 << (bitwidth - 1))) {
+ val = readbits(4, &crap) + 1;
+ bitwidth = (val < bitwidth) ? val : val + 1;
+ continue;
+ }
+ }
+ else if (bitwidth < 17) { //Method 2
+ word border = (0xFFFF >> (17 - bitwidth)) - 8;
+
+ if (val > border && val <= (border + 16)) {
+ val -= border;
+ bitwidth = val < bitwidth ? val : val + 1;
+ continue;
+ }
+ }
+ else if (bitwidth == 17) { //Method 3
+ if (val & 0x10000) {
+ bitwidth = (val + 1) & 0xFF;
+ continue;
+ }
+ }
+ else { //Illegal width, abort ?
+ freeblock(&crap);
+ return -1;
+ }
+
+ //Expand the value to signed byte:
+ {
+ short v; //The sample value:
+ if (bitwidth < 16) {
+ byte shift = 16 - bitwidth;
+ v = (short)(val << shift);
+ v >>= shift;
+ }
+ else
+ v = (short)val;
+
+ //And integrate the sample value
+ //(It always has to end with integration doesn't it ? ;-)
+ d1 += v;
+ d2 += d1;
+ }
+
+ //Store !
+ /* Version 2.15 was an unofficial version with hacked compression
+ * code. Yay, better compression :D
+ */
+ *data++ = cmwt == 0x215 ? d2 : d1;
+ len--;
+ blockpos++;
+ }
+ freeblock(&crap);
+ }
+ return 0;
+}
+
+
+
+static int it_read_envelope(IT_ENVELOPE *envelope, DUMBFILE *f)
+{
+ int n;
+
+ envelope->flags = dumbfile_getc(f);
+ envelope->n_nodes = dumbfile_getc(f);
+ envelope->loop_start = dumbfile_getc(f);
+ envelope->loop_end = dumbfile_getc(f);
+ envelope->sus_loop_start = dumbfile_getc(f);
+ envelope->sus_loop_end = dumbfile_getc(f);
+ for (n = 0; n < envelope->n_nodes; n++) {
+ envelope->node_y[n] = dumbfile_getc(f);
+ envelope->node_t[n] = dumbfile_igetw(f);
+ }
+ dumbfile_skip(f, 75 - envelope->n_nodes * 3 + 1);
+
+ if (envelope->n_nodes <= 0)
+ envelope->flags &= ~IT_ENVELOPE_ON;
+ else {
+ if (envelope->loop_end >= envelope->n_nodes || envelope->loop_start > envelope->loop_end) envelope->flags &= ~IT_ENVELOPE_LOOP_ON;
+ if (envelope->sus_loop_end >= envelope->n_nodes || envelope->sus_loop_start > envelope->sus_loop_end) envelope->flags &= ~IT_ENVELOPE_SUSTAIN_LOOP;
+ }
+
+ if (envelope->n_nodes <= 0)
+ envelope->flags &= ~IT_ENVELOPE_ON;
+ else {
+ if (envelope->loop_end >= envelope->n_nodes || envelope->loop_start > envelope->loop_end) envelope->flags &= ~IT_ENVELOPE_LOOP_ON;
+ if (envelope->sus_loop_end >= envelope->n_nodes || envelope->sus_loop_start > envelope->sus_loop_end) envelope->flags &= ~IT_ENVELOPE_SUSTAIN_LOOP;
+ }
+
+ return dumbfile_error(f);
+}
+
+
+
+static int it_read_old_instrument(IT_INSTRUMENT *instrument, DUMBFILE *f)
+{
+ int n;
+
+ /*if (dumbfile_mgetl(f) != IT_INSTRUMENT_SIGNATURE)
+ return -1;*/
+ // XXX
+ dumbfile_skip(f, 4);
+
+ dumbfile_getnc(instrument->filename, 13, f);
+ instrument->filename[13] = 0;
+
+ instrument->volume_envelope.flags = dumbfile_getc(f);
+ instrument->volume_envelope.loop_start = dumbfile_getc(f);
+ instrument->volume_envelope.loop_end = dumbfile_getc(f);
+ instrument->volume_envelope.sus_loop_start = dumbfile_getc(f);
+ instrument->volume_envelope.sus_loop_end = dumbfile_getc(f);
+
+ /* Skip two unused bytes. */
+ dumbfile_skip(f, 2);
+
+ /* In the old instrument format, fadeout ranges from 0 to 64, and is
+ * subtracted at intervals from a value starting at 512. In the new
+ * format, all these values are doubled. Therefore we double when loading
+ * from the old instrument format - that way we don't have to think about
+ * it later.
+ */
+ instrument->fadeout = dumbfile_igetw(f) << 1;
+ instrument->new_note_action = dumbfile_getc(f);
+ instrument->dup_check_type = dumbfile_getc(f);
+ instrument->dup_check_action = DCA_NOTE_CUT; // This might be wrong!
+ /** WARNING - what is the duplicate check action for old-style instruments? */
+
+ /* Skip Tracker Version and Number of Samples. These are only used in
+ * separate instrument files. Also skip unused byte.
+ */
+ dumbfile_skip(f, 4);
+
+ dumbfile_getnc(instrument->name, 26, f);
+ instrument->name[26] = 0;
+
+ /* Skip unused bytes following the Instrument Name. */
+ dumbfile_skip(f, 6);
+
+ instrument->pp_separation = 0;
+ instrument->pp_centre = 60;
+ instrument->global_volume = 128;
+ /** WARNING - should global_volume be 64 or something? */
+ instrument->default_pan = 32;
+ /** WARNING - should default_pan be 128, meaning don`t use? */
+ instrument->random_volume = 0;
+ instrument->random_pan = 0;
+
+ for (n = 0; n < 120; n++) {
+ instrument->map_note[n] = dumbfile_getc(f);
+ instrument->map_sample[n] = dumbfile_getc(f);
+ }
+
+ /* Skip "Volume envelope (200 bytes)". */
+ // - need to know better what this is for though.
+ dumbfile_skip(f, 200);
+
+#ifdef INVESTIGATE_OLD_INSTRUMENTS
+ fprintf(stderr, "Inst %02d Env:", n);
+#endif
+
+ for (n = 0; n < 25; n++)
+ {
+ instrument->volume_envelope.node_t[n] = dumbfile_getc(f);
+ instrument->volume_envelope.node_y[n] = dumbfile_getc(f);
+
+#ifdef INVESTIGATE_OLD_INSTRUMENTS
+ fprintf(stderr, " %d,%d",
+ instrument->volume_envelope.node_t[n],
+ instrument->volume_envelope.node_y[n]);
+#endif
+
+ // This loop is unfinished, as we can probably escape from it before
+ // the end if we want to. Hence the otherwise useless dumbfile_skip()
+ // call below.
+ }
+ dumbfile_skip(f, 50 - (n << 1));
+ instrument->volume_envelope.n_nodes = n;
+
+#ifdef INVESTIGATE_OLD_INSTRUMENTS
+ fprintf(stderr, "\n");
+#endif
+
+ if (dumbfile_error(f))
+ return -1;
+
+ {
+ IT_ENVELOPE *envelope = &instrument->volume_envelope;
+ if (envelope->n_nodes <= 0)
+ envelope->flags &= ~IT_ENVELOPE_ON;
+ else {
+ if (envelope->loop_end >= envelope->n_nodes || envelope->loop_start > envelope->loop_end) envelope->flags &= ~IT_ENVELOPE_LOOP_ON;
+ if (envelope->sus_loop_end >= envelope->n_nodes || envelope->sus_loop_start > envelope->sus_loop_end) envelope->flags &= ~IT_ENVELOPE_SUSTAIN_LOOP;
+ }
+ }
+
+ {
+ IT_ENVELOPE *envelope = &instrument->volume_envelope;
+ if (envelope->n_nodes <= 0)
+ envelope->flags &= ~IT_ENVELOPE_ON;
+ else {
+ if (envelope->loop_end >= envelope->n_nodes || envelope->loop_start > envelope->loop_end) envelope->flags &= ~IT_ENVELOPE_LOOP_ON;
+ if (envelope->sus_loop_end >= envelope->n_nodes || envelope->sus_loop_start > envelope->sus_loop_end) envelope->flags &= ~IT_ENVELOPE_SUSTAIN_LOOP;
+ }
+ }
+
+ instrument->filter_cutoff = 127;
+ instrument->filter_resonance = 0;
+
+ instrument->pan_envelope.flags = 0;
+ instrument->pitch_envelope.flags = 0;
+
+ return 0;
+}
+
+
+
+static int it_read_instrument(IT_INSTRUMENT *instrument, DUMBFILE *f, int maxlen)
+{
+ int n, len;
+
+ /*if (dumbfile_mgetl(f) != IT_INSTRUMENT_SIGNATURE)
+ return -1;*/
+ // XXX
+
+ if (maxlen) len = dumbfile_pos(f);
+
+ dumbfile_skip(f, 4);
+
+ dumbfile_getnc(instrument->filename, 13, f);
+ instrument->filename[13] = 0;
+
+ instrument->new_note_action = dumbfile_getc(f);
+ instrument->dup_check_type = dumbfile_getc(f);
+ instrument->dup_check_action = dumbfile_getc(f);
+ instrument->fadeout = dumbfile_igetw(f);
+ instrument->pp_separation = dumbfile_getc(f);
+ instrument->pp_centre = dumbfile_getc(f);
+ instrument->global_volume = dumbfile_getc(f);
+ instrument->default_pan = dumbfile_getc(f);
+ instrument->random_volume = dumbfile_getc(f);
+ instrument->random_pan = dumbfile_getc(f);
+
+ /* Skip Tracker Version and Number of Samples. These are only used in
+ * separate instrument files. Also skip unused byte.
+ */
+ dumbfile_skip(f, 4);
+
+ dumbfile_getnc(instrument->name, 26, f);
+ instrument->name[26] = 0;
+
+ instrument->filter_cutoff = dumbfile_getc(f);
+ instrument->filter_resonance = dumbfile_getc(f);
+
+ /* Skip MIDI Channel, Program and Bank. */
+ //dumbfile_skip(f, 4);
+ /*instrument->output = dumbfile_getc(f);
+ if ( instrument->output > 16 ) {
+ instrument->output -= 128;
+ } else {
+ instrument->output = 0;
+ }
+ dumbfile_skip(f, 3);*/
+ dumbfile_skip(f, 4);
+
+ for (n = 0; n < 120; n++) {
+ instrument->map_note[n] = dumbfile_getc(f);
+ instrument->map_sample[n] = dumbfile_getc(f);
+ }
+
+ if (dumbfile_error(f))
+ return -1;
+
+ if (it_read_envelope(&instrument->volume_envelope, f)) return -1;
+ if (it_read_envelope(&instrument->pan_envelope, f)) return -1;
+ if (it_read_envelope(&instrument->pitch_envelope, f)) return -1;
+
+ if (maxlen) {
+ len = dumbfile_pos(f) - len;
+ if ( maxlen - len < 124 ) return 0;
+ }
+
+ if ( dumbfile_mgetl(f) == IT_MPTX_SIGNATURE ) {
+ for ( n = 0; n < 120; n++ ) {
+ instrument->map_sample[ n ] += dumbfile_getc( f ) << 8;
+ }
+
+ if (dumbfile_error(f))
+ return -1;
+ }
+
+ /*if ( dumbfile_mgetl(f) == IT_INSM_SIGNATURE ) {
+ long end = dumbfile_igetl(f);
+ end += dumbfile_pos(f);
+ while ( dumbfile_pos(f) < end ) {
+ int chunkid = dumbfile_igetl(f);
+ switch ( chunkid ) {
+ case DUMB_ID('P','L','U','G'):
+ instrument->output = dumbfile_getc(f);
+ break;
+ default:
+ chunkid = chunkid / 0x100 + dumbfile_getc(f) * 0x1000000;
+ break;
+ }
+ }
+
+ if (dumbfile_error(f))
+ return -1;
+ }*/
+
+ return 0;
+}
+
+
+
+static int it_read_sample_header(IT_SAMPLE *sample, unsigned char *convert, long *offset, DUMBFILE *f)
+{
+ /* XXX
+ if (dumbfile_mgetl(f) != IT_SAMPLE_SIGNATURE)
+ return -1;*/
+ int hax = 0;
+ long s = dumbfile_mgetl(f);
+ if (s != IT_SAMPLE_SIGNATURE) {
+ if ( s == ( IT_SAMPLE_SIGNATURE >> 16 ) ) {
+ s <<= 16;
+ s |= dumbfile_mgetw(f);
+ if ( s != IT_SAMPLE_SIGNATURE )
+ return -1;
+ hax = 1;
+ }
+ }
+
+ dumbfile_getnc(sample->filename, 13, f);
+ sample->filename[13] = 0;
+
+ sample->global_volume = dumbfile_getc(f);
+ sample->flags = dumbfile_getc(f);
+ sample->default_volume = dumbfile_getc(f);
+
+ dumbfile_getnc(sample->name, 26, f);
+ sample->name[26] = 0;
+
+ *convert = dumbfile_getc(f);
+ sample->default_pan = dumbfile_getc(f);
+ sample->length = dumbfile_igetl(f);
+ sample->loop_start = dumbfile_igetl(f);
+ sample->loop_end = dumbfile_igetl(f);
+ sample->C5_speed = dumbfile_igetl(f);
+ sample->sus_loop_start = dumbfile_igetl(f);
+ sample->sus_loop_end = dumbfile_igetl(f);
+
+#ifdef STEREO_SAMPLES_COUNT_AS_TWO
+ if (sample->flags & IT_SAMPLE_STEREO) {
+ sample->length >>= 1;
+ sample->loop_start >>= 1;
+ sample->loop_end >>= 1;
+ sample->C5_speed >>= 1;
+ sample->sus_loop_start >>= 1;
+ sample->sus_loop_end >>= 1;
+ }
+#endif
+
+ if (sample->flags & IT_SAMPLE_EXISTS) {
+ if (sample->length <= 0)
+ sample->flags &= ~IT_SAMPLE_EXISTS;
+ else {
+ if ((unsigned int)sample->loop_end > (unsigned int)sample->length)
+ sample->flags &= ~IT_SAMPLE_LOOP;
+ else if ((unsigned int)sample->loop_start >= (unsigned int)sample->loop_end)
+ sample->flags &= ~IT_SAMPLE_LOOP;
+
+ if ((unsigned int)sample->sus_loop_end > (unsigned int)sample->length)
+ sample->flags &= ~IT_SAMPLE_SUS_LOOP;
+ else if ((unsigned int)sample->sus_loop_start >= (unsigned int)sample->sus_loop_end)
+ sample->flags &= ~IT_SAMPLE_SUS_LOOP;
+
+ /* We may be able to truncate the sample to save memory. */
+ if (sample->flags & IT_SAMPLE_LOOP &&
+ *convert != 0xFF) { /* not truncating compressed samples, for now... */
+ if ((sample->flags & IT_SAMPLE_SUS_LOOP) && sample->sus_loop_end >= sample->loop_end)
+ sample->length = sample->sus_loop_end;
+ else
+ sample->length = sample->loop_end;
+ }
+ }
+ }
+
+ *offset = dumbfile_igetl(f);
+
+ sample->vibrato_speed = dumbfile_getc(f);
+ sample->vibrato_depth = dumbfile_getc(f);
+ if ( ! hax ) {
+ sample->vibrato_rate = dumbfile_getc(f);
+ sample->vibrato_waveform = dumbfile_getc(f);
+ } else {
+ sample->vibrato_rate = 0;
+ sample->vibrato_waveform = 0;
+ }
+ sample->finetune = 0;
+ sample->max_resampling_quality = -1;
+
+ return dumbfile_error(f);
+}
+
+long _dumb_it_read_sample_data_adpcm4(IT_SAMPLE *sample, DUMBFILE *f)
+{
+ long n, len, delta;
+ signed char * ptr, * end;
+ signed char compression_table[16];
+ if (dumbfile_getnc(compression_table, 16, f) != 16)
+ return -1;
+ ptr = (signed char *) sample->data;
+ delta = 0;
+
+ end = ptr + sample->length;
+ len = (sample->length + 1) / 2;
+ for (n = 0; n < len; n++) {
+ int b = dumbfile_getc(f);
+ if (b < 0) return -1;
+ delta += compression_table[b & 0x0F];
+ *ptr++ = delta;
+ if (ptr >= end) break;
+ delta += compression_table[b >> 4];
+ *ptr++ = delta;
+ }
+
+ return 0;
+}
+
+
+static long it_read_sample_data(int cmwt, IT_SAMPLE *sample, unsigned char convert, DUMBFILE *f)
+{
+ long n;
+
+ long datasize = sample->length;
+ if (sample->flags & IT_SAMPLE_STEREO) datasize <<= 1;
+
+ sample->data = malloc(datasize * (sample->flags & IT_SAMPLE_16BIT ? 2 : 1));
+ if (!sample->data)
+ return -1;
+
+ if (!(sample->flags & IT_SAMPLE_16BIT) && (convert == 0xFF)) {
+ if (_dumb_it_read_sample_data_adpcm4(sample, f) < 0)
+ return -1;
+ } else if (sample->flags & 8) {
+ /* If the sample is packed, then we must unpack it. */
+
+ /** WARNING - unresolved business here... test with ModPlug? */
+
+ if (sample->flags & IT_SAMPLE_STEREO)
+ return -1;
+
+/*
+//#ifndef STEREO_SAMPLES_COUNT_AS_TWO
+ ASSERT(!(sample->flags & IT_SAMPLE_STEREO));
+//#endif
+*/
+ if (sample->flags & IT_SAMPLE_16BIT)
+ decompress16(f, sample->data, datasize, ((cmwt >= 0x215) && (convert & 4)));
+ else
+ decompress8(f, sample->data, datasize, ((cmwt >= 0x215) && (convert & 4)));
+ } else if (sample->flags & IT_SAMPLE_16BIT) {
+ if (convert & 2)
+ for (n = 0; n < datasize; n++)
+ ((short *)sample->data)[n] = dumbfile_mgetw(f);
+ else
+ for (n = 0; n < datasize; n++)
+ ((short *)sample->data)[n] = dumbfile_igetw(f);
+ } else
+ for (n = 0; n < datasize; n++)
+ ((signed char *)sample->data)[n] = dumbfile_getc(f);
+
+ if (dumbfile_error(f))
+ return -1;
+
+ if (!(convert & 1)) {
+ /* Convert to signed. */
+ if (sample->flags & IT_SAMPLE_16BIT)
+ for (n = 0; n < datasize; n++)
+ ((short *)sample->data)[n] ^= 0x8000;
+ else
+ for (n = 0; n < datasize; n++)
+ ((signed char *)sample->data)[n] ^= 0x80;
+ }
+
+ /* NOT SUPPORTED:
+ *
+ * convert & 4 - Samples stored as delta values
+ * convert & 16 - Samples stored as TX-Wave 12-bit values
+ * convert & 32 - Left/Right/All Stereo prompt
+ */
+
+ return 0;
+}
+
+
+
+//#define DETECT_DUPLICATE_CHANNELS
+#ifdef DETECT_DUPLICATE_CHANNELS
+#include <stdio.h>
+#endif
+static int it_read_pattern(IT_PATTERN *pattern, DUMBFILE *f, unsigned char *buffer)
+{
+ unsigned char cmask[DUMB_IT_N_CHANNELS];
+ unsigned char cnote[DUMB_IT_N_CHANNELS];
+ unsigned char cinstrument[DUMB_IT_N_CHANNELS];
+ unsigned char cvolpan[DUMB_IT_N_CHANNELS];
+ unsigned char ceffect[DUMB_IT_N_CHANNELS];
+ unsigned char ceffectvalue[DUMB_IT_N_CHANNELS];
+#ifdef DETECT_DUPLICATE_CHANNELS
+ IT_ENTRY *dupentry[DUMB_IT_N_CHANNELS];
+#endif
+
+ int n_entries = 0;
+ int buflen;
+ int bufpos = 0;
+
+ IT_ENTRY *entry;
+
+ unsigned char channel;
+ unsigned char mask;
+
+ memset(cmask, 0, sizeof(cmask));
+ memset(cnote, 0, sizeof(cnote));
+ memset(cinstrument, 0, sizeof(cinstrument));
+ memset(cvolpan, 0, sizeof(cvolpan));
+ memset(ceffect, 0, sizeof(ceffect));
+ memset(ceffectvalue, 0, sizeof(ceffectvalue));
+#ifdef DETECT_DUPLICATE_CHANNELS
+ {
+ int i;
+ for (i = 0; i < DUMB_IT_N_CHANNELS; i++) dupentry[i] = NULL;
+ }
+#endif
+
+ buflen = dumbfile_igetw(f);
+ pattern->n_rows = dumbfile_igetw(f);
+
+ /* Skip four unused bytes. */
+ dumbfile_skip(f, 4);
+
+ if (dumbfile_error(f))
+ return -1;
+
+ /* Read in the pattern data. */
+ dumbfile_getnc(buffer, buflen, f);
+
+ if (dumbfile_error(f))
+ return -1;
+
+ /* Scan the pattern data, and work out how many entries we need room for. */
+ while (bufpos < buflen) {
+ unsigned char b = buffer[bufpos++];
+
+ if (b == 0) {
+ /* End of row */
+ n_entries++;
+ continue;
+ }
+
+ channel = (b - 1) & 63;
+
+ if (b & 128)
+ cmask[channel] = mask = buffer[bufpos++];
+ else
+ mask = cmask[channel];
+
+ {
+ static const unsigned char used[16] = {0, 1, 1, 2, 1, 2, 2, 3, 2, 3, 3, 4, 3, 4, 4, 5};
+ n_entries += (mask != 0);
+ bufpos += used[mask & 15];
+ }
+ }
+
+ pattern->n_entries = n_entries;
+
+ pattern->entry = malloc(n_entries * sizeof(*pattern->entry));
+
+ if (!pattern->entry)
+ return -1;
+
+ bufpos = 0;
+ memset(cmask, 0, sizeof(cmask));
+
+ entry = pattern->entry;
+
+ while (bufpos < buflen) {
+ unsigned char b = buffer[bufpos++];
+
+ if (b == 0) {
+ /* End of row */
+ IT_SET_END_ROW(entry);
+ entry++;
+#ifdef DETECT_DUPLICATE_CHANNELS
+ {
+ int i;
+ for (i = 0; i < DUMB_IT_N_CHANNELS; i++) dupentry[i] = NULL;
+ }
+#endif
+ continue;
+ }
+
+ channel = (b - 1) & 63;
+
+ if (b & 128)
+ cmask[channel] = mask = buffer[bufpos++];
+ else
+ mask = cmask[channel];
+
+ if (mask) {
+ entry->mask = (mask & 15) | (mask >> 4);
+ entry->channel = channel;
+
+ if (mask & IT_ENTRY_NOTE)
+ cnote[channel] = entry->note = buffer[bufpos++];
+ else if (mask & (IT_ENTRY_NOTE << 4))
+ entry->note = cnote[channel];
+
+ if (mask & IT_ENTRY_INSTRUMENT)
+ cinstrument[channel] = entry->instrument = buffer[bufpos++];
+ else if (mask & (IT_ENTRY_INSTRUMENT << 4))
+ entry->instrument = cinstrument[channel];
+
+ if (mask & IT_ENTRY_VOLPAN)
+ cvolpan[channel] = entry->volpan = buffer[bufpos++];
+ else if (mask & (IT_ENTRY_VOLPAN << 4))
+ entry->volpan = cvolpan[channel];
+
+ if (mask & IT_ENTRY_EFFECT) {
+ ceffect[channel] = entry->effect = buffer[bufpos++];
+ ceffectvalue[channel] = entry->effectvalue = buffer[bufpos++];
+ } else {
+ entry->effect = ceffect[channel];
+ entry->effectvalue = ceffectvalue[channel];
+ }
+
+#ifdef DETECT_DUPLICATE_CHANNELS
+ if (dupentry[channel]) {
+ FILE *f = fopen("dupentry.txt", "a");
+ if (!f) abort();
+ fprintf(f, "Two events on channel %d:", channel);
+ fprintf(f, " Event #1:");
+ if (dupentry[channel]->mask & IT_ENTRY_NOTE ) fprintf(f, " %03d", dupentry[channel]->note ); else fprintf(f, " ...");
+ if (dupentry[channel]->mask & IT_ENTRY_INSTRUMENT) fprintf(f, " %03d", dupentry[channel]->instrument); else fprintf(f, " ...");
+ if (dupentry[channel]->mask & IT_ENTRY_VOLPAN ) fprintf(f, " %03d", dupentry[channel]->volpan ); else fprintf(f, " ...");
+ if (dupentry[channel]->mask & IT_ENTRY_EFFECT) fprintf(f, " %c%02X\n", 'A' - 1 + dupentry[channel]->effect, dupentry[channel]->effectvalue); else fprintf(f, " ...\n");
+ fprintf(f, " Event #2:");
+ if (entry->mask & IT_ENTRY_NOTE ) fprintf(f, " %03d", entry->note ); else fprintf(f, " ...");
+ if (entry->mask & IT_ENTRY_INSTRUMENT) fprintf(f, " %03d", entry->instrument); else fprintf(f, " ...");
+ if (entry->mask & IT_ENTRY_VOLPAN ) fprintf(f, " %03d", entry->volpan ); else fprintf(f, " ...");
+ if (entry->mask & IT_ENTRY_EFFECT) fprintf(f, " %c%02X\n", 'A' - 1 + entry->effect, entry->effectvalue); else fprintf(f, " ...\n");
+ fclose(f);
+ }
+ dupentry[channel] = entry;
+#endif
+
+ entry++;
+ }
+ }
+
+ ASSERT(entry == pattern->entry + n_entries);
+
+ return 0;
+}
+
+
+
+/* Currently we assume the sample data are stored after the sample headers in
+ * module files. This assumption may be unjustified; let me know if you have
+ * trouble.
+ */
+
+#define IT_COMPONENT_SONG_MESSAGE 1
+#define IT_COMPONENT_INSTRUMENT 2
+#define IT_COMPONENT_PATTERN 3
+#define IT_COMPONENT_SAMPLE 4
+
+typedef struct IT_COMPONENT
+{
+ unsigned char type;
+ unsigned short n;
+ long offset;
+ short sampfirst; /* component[sampfirst] = first sample data after this */
+ short sampnext; /* sampnext is used to create linked lists of sample data */
+}
+IT_COMPONENT;
+
+
+
+static int it_component_compare(const void *e1, const void *e2)
+{
+ return ((const IT_COMPONENT *)e1)->offset -
+ ((const IT_COMPONENT *)e2)->offset;
+}
+
+
+
+static sigdata_t *it_load_sigdata(DUMBFILE *f)
+{
+ DUMB_IT_SIGDATA *sigdata;
+
+ int cwt, cmwt;
+ int special;
+ int message_length, message_offset;
+
+ IT_COMPONENT *component;
+ int n_components = 0;
+
+ unsigned char sample_convert[4096];
+
+ int n;
+
+ unsigned char *buffer;
+
+ if (dumbfile_mgetl(f) != IT_SIGNATURE)
+ return NULL;
+
+ sigdata = malloc(sizeof(*sigdata));
+
+ if (!sigdata)
+ return NULL;
+
+ sigdata->song_message = NULL;
+ sigdata->order = NULL;
+ sigdata->instrument = NULL;
+ sigdata->sample = NULL;
+ sigdata->pattern = NULL;
+ sigdata->midi = NULL;
+ sigdata->checkpoint = NULL;
+
+ dumbfile_getnc(sigdata->name, 26, f);
+ sigdata->name[26] = 0;
+
+ /* Skip pattern row highlight info. */
+ dumbfile_skip(f, 2);
+
+ sigdata->n_orders = dumbfile_igetw(f);
+ sigdata->n_instruments = dumbfile_igetw(f);
+ sigdata->n_samples = dumbfile_igetw(f);
+ sigdata->n_patterns = dumbfile_igetw(f);
+
+ cwt = dumbfile_igetw(f);
+ cmwt = dumbfile_igetw(f);
+
+ sigdata->flags = dumbfile_igetw(f);
+ special = dumbfile_igetw(f);
+
+ sigdata->global_volume = dumbfile_getc(f);
+ sigdata->mixing_volume = dumbfile_getc(f);
+ sigdata->speed = dumbfile_getc(f);
+ if (sigdata->speed == 0) sigdata->speed = 6; // Should we? What about tempo?
+ sigdata->tempo = dumbfile_getc(f);
+ sigdata->pan_separation = dumbfile_getc(f); /** WARNING: use this */
+
+ /* Skip Pitch Wheel Depth */
+ dumbfile_skip(f, 1);
+
+ message_length = dumbfile_igetw(f);
+ message_offset = dumbfile_igetl(f);
+
+ /* Skip Reserved. */
+ dumbfile_skip(f, 4);
+
+ dumbfile_getnc(sigdata->channel_pan, DUMB_IT_N_CHANNELS, f);
+ dumbfile_getnc(sigdata->channel_volume, DUMB_IT_N_CHANNELS, f);
+
+ // XXX sample count
+ if (dumbfile_error(f) || sigdata->n_orders <= 0 || sigdata->n_instruments > 256 || sigdata->n_samples > 4000 || sigdata->n_patterns > 256) {
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ sigdata->order = malloc(sigdata->n_orders);
+ if (!sigdata->order) {
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ if (sigdata->n_instruments) {
+ sigdata->instrument = malloc(sigdata->n_instruments * sizeof(*sigdata->instrument));
+ if (!sigdata->instrument) {
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ }
+
+ if (sigdata->n_samples) {
+ sigdata->sample = malloc(sigdata->n_samples * sizeof(*sigdata->sample));
+ if (!sigdata->sample) {
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ for (n = 0; n < sigdata->n_samples; n++)
+ sigdata->sample[n].data = NULL;
+ }
+
+ if (sigdata->n_patterns) {
+ sigdata->pattern = malloc(sigdata->n_patterns * sizeof(*sigdata->pattern));
+ if (!sigdata->pattern) {
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ for (n = 0; n < sigdata->n_patterns; n++)
+ sigdata->pattern[n].entry = NULL;
+ }
+
+ dumbfile_getnc(sigdata->order, sigdata->n_orders, f);
+ sigdata->restart_position = 0;
+
+ component = malloc(769 * sizeof(*component));
+ if (!component) {
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ if (special & 1) {
+ component[n_components].type = IT_COMPONENT_SONG_MESSAGE;
+ component[n_components].offset = message_offset;
+ component[n_components].sampfirst = -1;
+ n_components++;
+ }
+
+ for (n = 0; n < sigdata->n_instruments; n++) {
+ component[n_components].type = IT_COMPONENT_INSTRUMENT;
+ component[n_components].n = n;
+ component[n_components].offset = dumbfile_igetl(f);
+ component[n_components].sampfirst = -1;
+ n_components++;
+ }
+
+ for (n = 0; n < sigdata->n_samples; n++) {
+ component[n_components].type = IT_COMPONENT_SAMPLE;
+ component[n_components].n = n;
+ component[n_components].offset = dumbfile_igetl(f);
+ component[n_components].sampfirst = -1;
+ n_components++;
+ }
+
+ for (n = 0; n < sigdata->n_patterns; n++) {
+ long offset = dumbfile_igetl(f);
+ if (offset) {
+ component[n_components].type = IT_COMPONENT_PATTERN;
+ component[n_components].n = n;
+ component[n_components].offset = offset;
+ component[n_components].sampfirst = -1;
+ n_components++;
+ } else {
+ /* Empty 64-row pattern */
+ sigdata->pattern[n].n_rows = 64;
+ sigdata->pattern[n].n_entries = 0;
+ }
+ }
+
+ if (dumbfile_error(f)) {
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ /*
+ if (!(sigdata->flags & 128) != !(special & 8)) {
+ fprintf(stderr, "Flags Bit 7 (\"Request embedded MIDI configuration\"): %s\n", sigdata->flags & 128 ? "=SET=" : "clear");
+ fprintf(stderr, "Special Bit 3 (\"MIDI configuration embedded\") : %s\n", special & 8 ? "=SET=" : "clear");
+ fprintf(stderr, "entheh would like to investigate this IT file.\n");
+ fprintf(stderr, "Please contact him! entheh@users.sf.net\n");
+ }
+ */
+
+ if (special & 8) {
+ /* MIDI configuration is embedded. */
+ unsigned char mididata[32];
+ int i;
+ sigdata->midi = malloc(sizeof(*sigdata->midi));
+ if (!sigdata->midi) {
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ // Should we be happy with this outcome in some situations?
+ }
+ // What are we skipping?
+ i = dumbfile_igetw(f);
+ if (dumbfile_error(f) || dumbfile_skip(f, 8*i)) {
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ /* Read embedded MIDI configuration */
+ // What are the first 9 commands for?
+ if (dumbfile_skip(f, 32*9)) {
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ for (i = 0; i < 16; i++) {
+ unsigned char len = 0;
+ int j, leftdigit = -1;
+ if (dumbfile_getnc(mididata, 32, f) < 32) {
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ sigdata->midi->SFmacroz[i] = 0;
+ for (j = 0; j < 32; j++) {
+ if (leftdigit >= 0) {
+ if (mididata[j] == 0) {
+ sigdata->midi->SFmacro[i][len++] = leftdigit;
+ break;
+ } else if (mididata[j] == ' ')
+ sigdata->midi->SFmacro[i][len++] = leftdigit;
+ else if (mididata[j] >= '0' && mididata[j] <= '9')
+ sigdata->midi->SFmacro[i][len++] = (leftdigit << 4) | (mididata[j] - '0');
+ else if (mididata[j] >= 'A' && mididata[j] <= 'F')
+ sigdata->midi->SFmacro[i][len++] = (leftdigit << 4) | (mididata[j] - 'A' + 0xA);
+ leftdigit = -1;
+ } else if (mididata[j] == 0)
+ break;
+ else if (mididata[j] == 'z')
+ sigdata->midi->SFmacroz[i] |= 1 << len++;
+ else if (mididata[j] >= '0' && mididata[j] <= '9')
+ leftdigit = mididata[j] - '0';
+ else if (mididata[j] >= 'A' && mididata[j] <= 'F')
+ leftdigit = mididata[j] - 'A' + 0xA;
+ }
+ sigdata->midi->SFmacrolen[i] = len;
+ }
+ for (i = 0; i < 128; i++) {
+ unsigned char len = 0;
+ int j, leftdigit = -1;
+ dumbfile_getnc(mididata, 32, f);
+ for (j = 0; j < 32; j++) {
+ if (leftdigit >= 0) {
+ if (mididata[j] == 0) {
+ sigdata->midi->Zmacro[i][len++] = leftdigit;
+ break;
+ } else if (mididata[j] == ' ')
+ sigdata->midi->Zmacro[i][len++] = leftdigit;
+ else if (mididata[j] >= '0' && mididata[j] <= '9')
+ sigdata->midi->Zmacro[i][len++] = (leftdigit << 4) | (mididata[j] - '0');
+ else if (mididata[j] >= 'A' && mididata[j] <= 'F')
+ sigdata->midi->Zmacro[i][len++] = (leftdigit << 4) | (mididata[j] - 'A' + 0xA);
+ leftdigit = -1;
+ } else if (mididata[j] == 0)
+ break;
+ else if (mididata[j] >= '0' && mididata[j] <= '9')
+ leftdigit = mididata[j] - '0';
+ else if (mididata[j] >= 'A' && mididata[j] <= 'F')
+ leftdigit = mididata[j] - 'A' + 0xA;
+ }
+ sigdata->midi->Zmacrolen[i] = len;
+ }
+ }
+
+ sigdata->flags &= IT_REAL_FLAGS;
+
+ qsort(component, n_components, sizeof(IT_COMPONENT), &it_component_compare);
+
+ buffer = malloc(65536);
+ if (!buffer) {
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ for (n = 0; n < n_components; n++) {
+ long offset;
+ int m;
+
+ /* XXX */
+ if ( component[n].offset == 0 ) {
+ switch (component[n].type) {
+ case IT_COMPONENT_INSTRUMENT:
+ memset( &sigdata->instrument[component[n].n], 0, sizeof(IT_INSTRUMENT) );
+ break;
+ case IT_COMPONENT_SAMPLE:
+ memset( &sigdata->sample[component[n].n], 0, sizeof(IT_SAMPLE) );
+ break;
+ case IT_COMPONENT_PATTERN:
+ {
+ IT_PATTERN * p = &sigdata->pattern[component[n].n];
+ p->entry = 0;
+ p->n_rows = 64;
+ p->n_entries = 0;
+ }
+ break;
+ }
+ continue;
+ }
+
+ if (it_seek(f, component[n].offset)) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ switch (component[n].type) {
+
+ case IT_COMPONENT_SONG_MESSAGE:
+ sigdata->song_message = malloc(message_length + 1);
+ if (sigdata->song_message) {
+ if (dumbfile_getnc(sigdata->song_message, message_length, f) < message_length) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ sigdata->song_message[message_length] = 0;
+ }
+ break;
+
+ case IT_COMPONENT_INSTRUMENT:
+ if (cmwt < 0x200)
+ m = it_read_old_instrument(&sigdata->instrument[component[n].n], f);
+ else
+ m = it_read_instrument(&sigdata->instrument[component[n].n], f, (n + 1 < n_components) ? (component[n+1].offset - component[n].offset) : 0);
+
+ if (m) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ break;
+
+ case IT_COMPONENT_PATTERN:
+ if (it_read_pattern(&sigdata->pattern[component[n].n], f, buffer)) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+ break;
+
+ case IT_COMPONENT_SAMPLE:
+ if (it_read_sample_header(&sigdata->sample[component[n].n], &sample_convert[component[n].n], &offset, f)) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ if (sigdata->sample[component[n].n].flags & IT_SAMPLE_EXISTS) {
+ short *sample;
+
+ for (m = n + 1; m < n_components; m++)
+ if (component[m].offset > offset)
+ break;
+ m--;
+
+ sample = &component[m].sampfirst;
+
+ while (*sample >= 0 && component[*sample].offset <= offset)
+ sample = &component[*sample].sampnext;
+
+ component[n].sampnext = *sample;
+ *sample = n;
+
+ component[n].offset = offset;
+ }
+ }
+
+ m = component[n].sampfirst;
+
+ while (m >= 0) {
+ if (it_seek(f, component[m].offset)) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ if (it_read_sample_data(cmwt, &sigdata->sample[component[m].n], sample_convert[component[m].n], f)) {
+ free(buffer);
+ free(component);
+ _dumb_it_unload_sigdata(sigdata);
+ return NULL;
+ }
+
+ m = component[m].sampnext;
+ }
+ }
+
+ free(buffer);
+ free(component);
+
+ _dumb_it_fix_invalid_orders(sigdata);
+
+ return sigdata;
+}
+
+DUH *dumb_read_it_quick(DUMBFILE *f)
+{
+ sigdata_t *sigdata;
+
+ DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
+
+ sigdata = it_load_sigdata(f);
+
+ if (!sigdata)
+ return NULL;
+
+ {
+ const char *tag[1][2];
+ tag[0][0] = "TITLE";
+ tag[0][1] = ((DUMB_IT_SIGDATA *)sigdata)->name;
+ return make_duh(-1, 1, (const char *const (*)[2])tag, 1, &descptr, &sigdata);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-08 13:33:28 +0000