/*  _______         ____    __         ___    ___ * \    _  \       \    /  \  /       \   \  /   /       '   '  ' *  |  | \  \       |  |    ||         |   \/   |         .      . *  |  |  |  |      |  |    ||         ||\  /|  | *  |  |  |  |      |  |    ||         || \/ |  |         '  '  ' *  |  |  |  |      |  |    ||         ||    |  |         .      . *  |  |_/  /        \  \__//          ||    |  | * /_______/ynamic    \____/niversal  /__\  /____\usic   /|  .  . ibliotheque *                                                      /  \ *                                                     / .  \ * readasy.c - Code to read an ASYLUM Music Format    / / \  \ *             module from an open file.             | <  /   \_ *                                                   |  \/ /\   / * By Christopher Snowhill.                           \_  /  > / *                                                      | \ / / *                                                      |  ' / *                                                       \__/ */ #include <stdlib.h>#include <string.h>#include <math.h> #include "dumb.h"#include "internal/it.h" static int it_asy_read_pattern(IT_PATTERN *pattern, DUMBFILE *f,                               unsigned char *buffer) {    int pos;    int channel;    int row;    IT_ENTRY *entry;     pattern->n_rows = 64;     if (dumbfile_getnc((char *)buffer, 64 * 8 * 4, f) != 64 * 8 * 4)        return -1;     /* compute number of entries */    pattern->n_entries = 64; /* Account for the row end markers */    pos = 0;    for (row = 0; row < 64; ++row) {        for (channel = 0; channel < 8; ++channel) {            if (buffer[pos + 0] | buffer[pos + 1] | buffer[pos + 2] |                buffer[pos + 3])                ++pattern->n_entries;            pos += 4;        }    }     pattern->entry = malloc(pattern->n_entries * sizeof(*pattern->entry));    if (!pattern->entry)        return -1;     entry = pattern->entry;    pos = 0;    for (row = 0; row < 64; ++row) {        for (channel = 0; channel < 8; ++channel) {            if (buffer[pos + 0] | buffer[pos + 1] | buffer[pos + 2] |                buffer[pos + 3]) {                entry->channel = channel;                entry->mask = 0;                 if (buffer[pos + 0] && buffer[pos + 0] < 96) {                    entry->note = buffer[pos + 0];                    entry->mask |= IT_ENTRY_NOTE;                }                 if (buffer[pos + 1] && buffer[pos + 1] <= 64) {                    entry->instrument = buffer[pos + 1];                    entry->mask |= IT_ENTRY_INSTRUMENT;                }                 _dumb_it_xm_convert_effect(buffer[pos + 2], buffer[pos + 3],                                           entry, 1);                 // fixup                switch (entry->effect) {                case IT_SET_PANNING:                    entry->effectvalue <<= 1;                    break;                }                 if (entry->mask)                    ++entry;            }            pos += 4;        }        IT_SET_END_ROW(entry);        ++entry;    }     pattern->n_entries = (int)(entry - pattern->entry);     return 0;} static int it_asy_read_sample_header(IT_SAMPLE *sample, DUMBFILE *f) {    int finetune, key_offset;     /**         21       22   Chars     Sample 1 name.  If the name is not a full                                 22 chars in length, it will be null                                 terminated.     If    the sample name begins with a '#' character (ASCII $23 (35)) then this is    assumed not to be an instrument name, and is probably a message.    */    dumbfile_getnc((char *)sample->name, 22, f);    sample->name[22] = 0;     sample->filename[0] = 0;     /** Each  finetune step changes  the note 1/8th  of  a  semitone. */    finetune = (signed char)(dumbfile_getc(f) << 4) >> 4; /* signed nibble */    sample->default_volume =        dumbfile_getc(f); // Should we be setting global_volume to this instead?    sample->global_volume = 64;    if (sample->default_volume > 64)        sample->default_volume = 64;    key_offset = (signed char)dumbfile_getc(f); /* base key offset */    sample->length = dumbfile_igetl(f);    sample->loop_start = dumbfile_igetl(f);    sample->loop_end = sample->loop_start + dumbfile_igetl(f);     if (sample->length <= 0) {        sample->flags = 0;        return 0;    }     sample->flags = IT_SAMPLE_EXISTS;     sample->default_pan = 0;    sample->C5_speed =        (int)(AMIGA_CLOCK / 214.0 *              pow(DUMB_SEMITONE_BASE, key_offset)); //( long )( 16726.0 * pow(                                                    // DUMB_PITCH_BASE, finetune                                                    //* 32 ) );    sample->finetune = finetune * 32;    // the above line might be wrong     if ((sample->loop_end - sample->loop_start > 2) &&        (sample->loop_end <= sample->length))        sample->flags |= IT_SAMPLE_LOOP;     sample->vibrato_speed = 0;    sample->vibrato_depth = 0;    sample->vibrato_rate = 0;    sample->vibrato_waveform = 0; // do we have to set _all_ these?    sample->max_resampling_quality = -1;     return dumbfile_error(f);} static int it_asy_read_sample_data(IT_SAMPLE *sample, DUMBFILE *f) {    long truncated_size;     /* let's get rid of the sample data coming after the end of the loop */    if ((sample->flags & IT_SAMPLE_LOOP) && sample->loop_end < sample->length) {        truncated_size = sample->length - sample->loop_end;        sample->length = sample->loop_end;    } else {        truncated_size = 0;    }     sample->data = malloc(sample->length);     if (!sample->data)        return -1;     if (sample->length)        dumbfile_getnc(sample->data, sample->length, f);     dumbfile_skip(f, truncated_size);     return dumbfile_error(f);} static DUMB_IT_SIGDATA *it_asy_load_sigdata(DUMBFILE *f) {    DUMB_IT_SIGDATA *sigdata;    int i;     static const char sig_part[] = "ASYLUM Music Format";    static const char sig_rest[] =        " V1.0"; /* whee, string space optimization with format type below */     char signature[32];     if (dumbfile_getnc(signature, 32, f) != 32 ||        memcmp(signature, sig_part, 19) ||        memcmp(signature + 19, sig_rest, 5)) {        return NULL;    }     sigdata = malloc(sizeof(*sigdata));    if (!sigdata) {        return NULL;    }     sigdata->speed = dumbfile_getc(f); /* XXX seems to fit the files I have */    sigdata->tempo = dumbfile_getc(f); /* ditto */    sigdata->n_samples = dumbfile_getc(f); /* ditto */    sigdata->n_patterns = dumbfile_getc(f);    sigdata->n_orders = dumbfile_getc(f);    sigdata->restart_position = dumbfile_getc(f);     if (dumbfile_error(f) || !sigdata->n_samples || sigdata->n_samples > 64 ||        !sigdata->n_patterns || !sigdata->n_orders) {        free(sigdata);        return NULL;    }     if (sigdata->restart_position > sigdata->n_orders) /* XXX */        sigdata->restart_position = 0;     sigdata->order = malloc(sigdata->n_orders);    if (!sigdata->order) {        free(sigdata);        return NULL;    }     if (dumbfile_getnc((char *)sigdata->order, sigdata->n_orders, f) !=            sigdata->n_orders ||        dumbfile_skip(f, 256 - sigdata->n_orders)) {        free(sigdata->order);        free(sigdata);        return NULL;    }     sigdata->sample = malloc(sigdata->n_samples * sizeof(*sigdata->sample));    if (!sigdata->sample) {        free(sigdata->order);        free(sigdata);        return NULL;    }     sigdata->song_message = NULL;    sigdata->instrument = NULL;    sigdata->pattern = NULL;    sigdata->midi = NULL;    sigdata->checkpoint = NULL;     sigdata->n_instruments = 0;     for (i = 0; i < sigdata->n_samples; ++i)        sigdata->sample[i].data = NULL;     for (i = 0; i < sigdata->n_samples; ++i) {        if (it_asy_read_sample_header(&sigdata->sample[i], f)) {            _dumb_it_unload_sigdata(sigdata);            return NULL;        }    }     if (dumbfile_skip(f, 37 * (64 - sigdata->n_samples))) {        _dumb_it_unload_sigdata(sigdata);        return NULL;    }     sigdata->pattern = malloc(sigdata->n_patterns * sizeof(*sigdata->pattern));    if (!sigdata->pattern) {        _dumb_it_unload_sigdata(sigdata);        return NULL;    }    for (i = 0; i < sigdata->n_patterns; ++i)        sigdata->pattern[i].entry = NULL;     /* Read in the patterns */    {        unsigned char *buffer =            malloc(64 * 8 * 4); /* 64 rows * 8 channels * 4 bytes */        if (!buffer) {            _dumb_it_unload_sigdata(sigdata);            return NULL;        }        for (i = 0; i < sigdata->n_patterns; ++i) {            if (it_asy_read_pattern(&sigdata->pattern[i], f, buffer) != 0) {                free(buffer);                _dumb_it_unload_sigdata(sigdata);                return NULL;            }        }        free(buffer);    }     /* And finally, the sample data */    for (i = 0; i < sigdata->n_samples; ++i) {        if (it_asy_read_sample_data(&sigdata->sample[i], f)) {            _dumb_it_unload_sigdata(sigdata);            return NULL;        }    }     /* Now let's initialise the remaining variables, and we're done! */    sigdata->flags = IT_WAS_AN_XM | IT_WAS_A_MOD | IT_OLD_EFFECTS |                     IT_COMPATIBLE_GXX | IT_STEREO;     sigdata->global_volume = 128;    sigdata->mixing_volume = 48;    sigdata->pan_separation = 128;     sigdata->n_pchannels = 8;     sigdata->name[0] = 0;     memset(sigdata->channel_volume, 64, DUMB_IT_N_CHANNELS);     for (i = 0; i < DUMB_IT_N_CHANNELS; i += 4) {        int sep = 32 * dumb_it_default_panning_separation / 100;        sigdata->channel_pan[i + 0] = 32 - sep;        sigdata->channel_pan[i + 1] = 32 + sep;        sigdata->channel_pan[i + 2] = 32 + sep;        sigdata->channel_pan[i + 3] = 32 - sep;    }     if (_dumb_it_fix_invalid_orders(sigdata) < 0) {        _dumb_it_unload_sigdata(sigdata);        return NULL;    }     return sigdata;} DUH *dumb_read_asy_quick(DUMBFILE *f) {    sigdata_t *sigdata;     DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;     sigdata = it_asy_load_sigdata(f);     if (!sigdata)        return NULL;     {        const char *tag[2][2];        tag[0][0] = "TITLE";        tag[0][1] = (const char *)(((DUMB_IT_SIGDATA *)sigdata)->name);        tag[1][0] = "FORMAT";        tag[1][1] = "ASYLUM Music Format";        return make_duh(-1, 2, (const char *const(*)[2])tag, 1, &descptr,                        &sigdata);    }}