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dumpamos.c
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/* dumpamos: extracts AMOS source files and AMOS bank files */
#include "fileio.c"
#include <string.h>
#include <strings.h>
#include <stdarg.h>
#include <ctype.h>
#include <stdint.h>
/* read 16-bit big-endian word from uint8_t[] */
#define amos_deek(a) ((((a)[0])<<8)|((a)[1]))
/* read 32-bit big-endian word from uint8_t[] */
#define amos_leek(a) ((((a)[0])<<24)|(((a)[1])<<16)|(((a)[2])<<8)|((a)[3]))
/* write 32-bit big-endian word into uint8_t[] */
#define amos_doke(a, v) do { \
(a)[0] = ((v) >> 8) & 0xFF; \
(a)[1] = (v) & 0xFF; \
} while (0)
/* write 32-bit big-endian word into uint8_t[] */
#define amos_loke(a, v) do { \
(a)[0] = ((v) >> 24) & 0xFF; \
(a)[1] = ((v) >> 16) & 0xFF; \
(a)[2] = ((v) >> 8) & 0xFF; \
(a)[3] = ((v) ) & 0xFF; \
} while (0)
#define ID_AMOS (0x414D4F53)
#define ID_AmBs (0x416D4273)
#define ID_AmBk (0x416D426B)
#define ID_AmSp (0x416D5370)
#define ID_AmIc (0x416D4963)
#define IFF_ILBM_HEADER_LEN (0xb0)
static const uint8_t iff_ilbm_header[IFF_ILBM_HEADER_LEN] = {
'F', 'O', 'R', 'M', /* 00 FORM */
0, 0, 0, 0, /* 04 form length */
'I', 'L', 'B', 'M', /* 08 ILBM */
'B', 'M', 'H', 'D', /* 0c BMHD */
0, 0, 0, 20, /* 10 bmhd chunk length (20) */
0, 0, /* 14 width */
0, 0, /* 16 height */
0, 0, /* 18 x offset (0) */
0, 0, /* 1a y offset (0) */
0, /* 1c number of bitplanes */
0, /* 1d masking (0) */
0, /* 1e compression (0) */
0, /* 1e reserved1 (0) */
0, 0, /* 20 transparent colour (0) */
1, /* 22 x aspect (1) */
1, /* 23 x aspect (1) */
0, 0, /* 24 page width */
0, 0, /* 26 page height */
'C', 'A', 'M', 'G', /* 28 CAMG */
0, 0, 0, 4, /* 2c camg chunk length (4) */
0, 0, 0, 0, /* 30 viewmode */
'G', 'R', 'A', 'B', /* 34 GRAB */
0, 0, 0, 4, /* 38 grab chunk length (4) */
0, 0, /* 3C x hotspot */
0, 0, /* 3E y hotspot */
'C', 'M', 'A', 'P', /* 40 CMAP */
0, 0, 0, 96 /* 44 cmap chunk length (96) */
/* 48 {UBYTE r,g,b}[32] */
/* a8 BODY */
/* ac body chunk length */
/* b0 unpacked raw bitplanes */
};
#define IFF_8SVX_HEADER_LEN (0x30)
static const uint8_t iff_8svx_header[IFF_8SVX_HEADER_LEN] = {
'F', 'O', 'R', 'M', /* 00 FORM */
0, 0, 0, 0, /* 04 form length */
'8', 'S', 'V', 'X', /* 08 8SVX */
'V', 'H', 'D', 'R', /* 0c VHDR */
0, 0, 0, 20, /* 10 vhdr chunk length (20) */
0, 0, 0, 0, /* 14 one-shot length */
0, 0, 0, 0, /* 18 repeat length (0) */
0, 0, 0, 0, /* 1c average rate (0) */
0, 0, /* 20 frequency in hz */
1, /* 22 number of octaves (1) */
0, /* 23 compression mode (0) */
0, 1, 0, 0, /* 24 volume (0x10000) */
'B', 'O', 'D', 'Y', /* 28 BODY */
0, 0, 0, 0 /* 2c body length */
/* 30 raw sample data */
};
int use_prefix = 0;
char *output_fname(char *fname, char *fmt, ...) {
size_t namelen = strlen(fname), i;
char *name = malloc(namelen + 202);
va_list args;
if (!name) {
perror(fname);
return NULL;
}
*name = 0;
if (use_prefix) {
/* prefix input filename, with .amos/.abk/.abs stripped off */
char *extensions[] = {".amos", ".abk", ".abs"};
strcpy(name, fname);
for (i = 0; i < sizeof(extensions)/sizeof(*extensions); i++) {
size_t elen = strlen(extensions[i]);
if (namelen > elen && !strcasecmp(&name[namelen - elen], extensions[i])) {
name[namelen - elen] = 0;
break;
}
}
/* append "." */
strcat(name, ".");
}
va_start(args, fmt);
vsnprintf(&name[strlen(name)], 200, fmt, args);
va_end(args);
return name;
}
uint32_t bank_length(uint8_t *src, size_t len) {
if (len >= 6 && (amos_leek(src) == ID_AmSp || amos_leek(src) == ID_AmIc)) {
int num_sprites = amos_deek(&src[4]);
uint32_t pos = 6, w, h, d;
while (num_sprites--) {
if (pos + 10 > len) return 0;
w = amos_deek(&src[pos+0]) * 2;
h = amos_deek(&src[pos+2]);
d = amos_deek(&src[pos+4]);
pos += 10 + w * h * d;
}
pos += 64; /* include palette */
return pos > len ? 0 : pos;
}
else if (len >= 20 && amos_leek(src) == ID_AmBk) {
uint32_t bank_len = (amos_leek(&src[8]) & 0x0FFFFFFF) + 20 - 8;
return bank_len > len ? 0 : bank_len;
}
return 0;
}
uint32_t bank_number(uint8_t *src, size_t len) {
if (len >= 6 && amos_leek(src) == ID_AmSp) {
return 1; /* Sprites always bank 1 */
}
if (len >= 6 && amos_leek(src) == ID_AmIc) {
return 2; /* Icons always bank 2 */
}
if (len >= 20 && amos_leek(src) == ID_AmBk) {
return amos_deek(&src[4]);
}
return 0;
}
char *bank_type(uint8_t *src, size_t len) {
if (len >= 6 && amos_leek(src) == ID_AmSp) {
return "Sprites";
}
if (len >= 6 && amos_leek(src) == ID_AmIc) {
return "Icons";
}
if (len >= 20 && amos_leek(src) == ID_AmBk) {
/* copy bank type, remove space padding */
static char type[9];
char *tp = &type[8];
memcpy(type, &src[12], 8);
do { *tp-- = 0; } while (*tp == ' ' && tp > &type[0]);
return type;
}
return NULL;
}
/* https://www.exotica.org.uk/wiki/AMOS_file_formats#AMOS_Sprite_and_Icon_bank_formats */
void decode_sprites(char *fname, uint8_t *src, size_t len, char *prefix) {
uint32_t num_sprites = amos_deek(&src[4]);
uint8_t *sp = &src[6], *pal = &src[len - 64];
/* create an IFF ILBM file for each sprite/icon */
for (uint32_t i = 0; i < num_sprites; i++) {
uint32_t w, h, d, sp_len, ilbm_len, line, plane;
uint8_t *ilbm, *body;
w = amos_deek(&sp[0]) * 2;
h = amos_deek(&sp[2]);
d = amos_deek(&sp[4]);
sp_len = w * h * d;
ilbm_len = IFF_ILBM_HEADER_LEN + sp_len;
if ((ilbm = malloc(ilbm_len))) {
char *outname;
memcpy(ilbm, iff_ilbm_header, IFF_ILBM_HEADER_LEN);
amos_loke(&ilbm[0x04], ilbm_len - 8);
amos_doke(&ilbm[0x14], w * 8); /* width */
amos_doke(&ilbm[0x16], h); /* height */
ilbm[0x1c] = d & 0xFF; /* number of bitplanes */
amos_doke(&ilbm[0x24], w * 8); /* page width */
amos_doke(&ilbm[0x26], h); /* page height */
memcpy(&ilbm[0x3C], &sp[6], 4); /* x/y hotspot */
memcpy(&ilbm[0xA8], "BODY", 4);
amos_loke(&ilbm[0xAC], sp_len); /* body length */
/* convert palette from 0x0RGB to 0xRR 0xGG 0xBB */
for (int j = 0; j < 32; j++) {
uint32_t c = amos_deek(&pal[j * 2]);
ilbm[0x48 + (j * 3) + 0] = ((c >> 8) & 0xF) * 0x11;
ilbm[0x48 + (j * 3) + 1] = ((c >> 4) & 0xF) * 0x11;
ilbm[0x48 + (j * 3) + 2] = ((c ) & 0xF) * 0x11;
}
/* interleave the sprite data (all lines of plane 0, plane 1, ...)
* into ILBM format (line 0 plane 0, line 0 plane 1, ...) */
body = &ilbm[IFF_ILBM_HEADER_LEN];
for (line = 0; line < h; line++) {
for (plane = 0; plane < d; plane++) {
memcpy(body, &sp[10 + line*w + plane*w*h], w);
body += w;
}
}
/* save IFF ILBM */
if ((outname = output_fname(fname, "%s%02X.iff", prefix, i + 1))) {
printf("%s: converting %s %d to ILBM image %s (%d bytes)\n",
fname, prefix, i+1, outname, ilbm_len);
write_file(outname, ilbm, ilbm_len);
free(outname);
}
else {
perror(fname);
}
free(ilbm);
}
sp += 10 + sp_len;
}
}
/* https://www.exotica.org.uk/wiki/AMOS_Pac.Pic._format */
void decode_pacpic(char *fname, uint8_t *src, size_t len) {
uint8_t *end = &src[len], *s, *pal, *picdata, *rledata,
*points, *ilbm;
uint32_t i, j, k, l, bplcon0, width, ilbm_width, lumps,
lump_height, ilbm_height, bitplanes, ilbm_len, ilbm_line,
rledata_offset, points_offset;
/* check if screen header present */
if (len < 24) return;
i = amos_leek(&src[20]);
if (len > 134 && (i == 0x12031990 || i == 0x00031990 || i == 0x12030090)) {
bplcon0 = amos_deek(&src[20 + 20]); /* screen mode */
pal = &src[20 + 26]; /* palette */
s = &src[110]; /* picture header */
}
else if (len > 44 && (i == 0x06071963 || i == 0x06070063)) {
bplcon0 = amos_deek(&src[20 + 14]) << 12 | 0x200; /* guess BPLCON0 */
pal = NULL; /* no palette */
s = &src[20]; /* picture header */
}
else {
fprintf(stderr, "%s: unknown Pic.Pac. header $%08X\n", fname, i);
return;
}
width = amos_deek(&s[8]);
lumps = amos_deek(&s[10]);
lump_height = amos_deek(&s[12]);
bitplanes = amos_deek(&s[14]);
rledata_offset = amos_leek(&s[16]);
points_offset = amos_leek(&s[20]);
if (rledata_offset > (len - (s - src)) ||
points_offset > (len - (s - src)))
{
return;
}
/* IFF ILBM requires an even width */
ilbm_width = width;
if (ilbm_width & 1) ilbm_width++;
/* number of bytes jump to get to the next line in IFF */
ilbm_line = ilbm_width * bitplanes;
ilbm_height = lumps * lump_height;
ilbm_len = IFF_ILBM_HEADER_LEN + ilbm_line * ilbm_height;
if ((ilbm = malloc(ilbm_len))) {
uint8_t *plane, rbit, rrbit, picbyte, rlebyte;
char *outname;
memcpy(ilbm, iff_ilbm_header, IFF_ILBM_HEADER_LEN);
amos_loke(&ilbm[0x04], ilbm_len - 8);
amos_doke(&ilbm[0x14], ilbm_width * 8); /* width */
amos_doke(&ilbm[0x16], ilbm_height); /* height */
ilbm[0x1c] = bitplanes & 0xFF; /* number of bitplanes */
amos_doke(&ilbm[0x24], ilbm_width * 8); /* page width */
amos_doke(&ilbm[0x26], ilbm_height); /* page height */
amos_loke(&ilbm[0x30], bplcon0); /* viewmode */
memcpy(&ilbm[0xA8], "BODY", 4);
amos_loke(&ilbm[0xAC], ilbm_len - IFF_ILBM_HEADER_LEN); /* body length */
/* convert palette from 0x0RGB to 0xRR 0xGG 0xBB */
for (int i = 0; i < 32; i++) {
uint32_t c = pal ? amos_deek(&pal[i*2]) : (i & 0x0F) * 0x111;
ilbm[0x48 + (i * 3) + 0] = ((c >> 8) & 0xF) * 0x11;
ilbm[0x48 + (i * 3) + 1] = ((c >> 4) & 0xF) * 0x11;
ilbm[0x48 + (i * 3) + 2] = ((c ) & 0xF) * 0x11;
}
/* decrunch RLE streams */
rbit = 7;
rrbit = 6;
picdata = &s[24];
rledata = &s[rledata_offset];
points = &s[points_offset];
picbyte = *picdata++;
rlebyte = *rledata++;
if (*points & 0x80) rlebyte = *rledata++;
plane = &ilbm[IFF_ILBM_HEADER_LEN];
for (i = 0; i < bitplanes; i++) {
uint8_t *lump_start = plane;
for (j = 0; j < lumps; j++) {
uint8_t *lump_offset = lump_start;
for (k = 0; k < width; k++) {
uint8_t *d = lump_offset;
for (l = 0; l < lump_height; l++) {
/* if the current RLE bit is set to 1, read in a new picture byte */
if (rlebyte & (1 << rbit--)) {
picbyte = *picdata++;
if (picdata > end) {free(ilbm); return;}
}
/* write picture byte and move down by one line in the picture */
*d = picbyte; d += ilbm_line;
/* if we've run out of RLE bits, check the POINTS bits to see if
* a new RLE byte is needed */
if (rbit > 7) {
rbit = 7;
if (*points & (1 << rrbit--)) {
rlebyte = *rledata++;
if (rledata > end) {free(ilbm); return;}
}
if (rrbit > 7) {
rrbit = 7, points++;
if (points > end) {free(ilbm); return;}
}
}
}
lump_offset++;
}
lump_start += ilbm_line * lump_height;
}
plane += ilbm_width; /* ILBM interleaved bitplanes */
}
/* save IFF ILBM */
if ((outname = output_fname(fname, "pic%02X.iff", bank_number(src, len)))) {
printf("%s: unpacking to ILBM image %s (%d bytes)\n", fname, outname, ilbm_len);
write_file(outname, ilbm, ilbm_len);
free(outname);
}
else {
perror(fname);
}
free(ilbm);
}
}
/* https://www.exotica.org.uk/wiki/AMOS_Samples_Bank_format */
void decode_samples(char *fname, uint8_t *src, size_t len) {
uint32_t num_samples;
if (len < 22) return;
num_samples = amos_deek(&src[20]);
if (len < 22 + (num_samples * 4)) return;
/* create an IFF 8SVX file for each sample */
for (uint32_t i = 0; i < num_samples; i++) {
uint8_t *svx;
uint32_t offset = amos_leek(&src[22 + i*4]) + 22;
uint32_t freq, sam_len, svx_len;
uint8_t name[7];
if (offset > len) return;
/* copy sample name, change non-alnum to "_" */
memcpy(name, &src[offset], 6);
for (int i = 0; i < 6; i++) if (!isalnum(name[i])) name[i] = '_';
name[6] = 0;
freq = amos_deek(&src[offset + 8]);
sam_len = amos_leek(&src[offset + 10]);
if ((offset + 14 + sam_len) > len) {
sam_len = len - (offset + 14);
}
svx_len = IFF_8SVX_HEADER_LEN + sam_len;
if ((svx = malloc(svx_len))) {
char *outname;
memcpy(svx, iff_8svx_header, IFF_8SVX_HEADER_LEN);
amos_loke(&svx[0x04], svx_len - 8);
amos_doke(&svx[0x20], freq);
amos_loke(&svx[0x2C], sam_len);
memcpy(&svx[0x30], &src[offset + 14], sam_len);
/* save IFF 8SVX */
if ((outname = output_fname(fname, "sample%02X.%s.8svx", i + 1, name))) {
printf("%s: extracting sample %d to 8SVX sample %s (%d bytes)\n",
fname, i+1, outname, svx_len);
write_file(outname, svx, svx_len);
free(outname);
}
else {
perror(fname);
}
free(svx);
}
}
}
void decode_tracker(char *fname, uint8_t *src, size_t len) {
uint32_t mod_len = len - 20;
char *outname = output_fname(fname, "tracker%02X.mod", bank_number(src, len));
if (outname) {
printf("%s: extracting tracker mod %s (%d bytes)\n", fname, outname, mod_len);
write_file(outname, &src[20], mod_len);
free(outname);
}
else {
perror(fname);
}
}
void amos_bank(char *fname, uint8_t *src, size_t len) {
/* get the "real", validated bank length */
if (!(len = bank_length(src, len))) return;
if (amos_leek(src) == ID_AmSp) {
decode_sprites(fname, src, len, "sprite");
}
else if (amos_leek(src) == ID_AmIc) {
decode_sprites(fname, src, len, "icon");
}
else if (amos_leek(src) == ID_AmBk) {
if (!memcmp(&src[12], "Pac.Pic.", 8)) {
decode_pacpic(fname, src, len);
}
else if (!memcmp(&src[12], "Samples ", 8)) {
decode_samples(fname, src, len);
}
else if (!memcmp(&src[12], "Tracker ", 8)) {
decode_tracker(fname, src, len);
}
}
}
void amos_banks(char *fname, uint8_t *src, size_t len) {
if (len < 6) {
fprintf(stderr, "%s: file too short to be AMOS banks\n", fname);
}
else {
uint32_t num_banks = amos_deek(&src[4]), bank_pos = 6;
while (num_banks--) {
uint32_t bank_len = bank_length(&src[bank_pos], len - bank_pos);
uint32_t bank_num = bank_number(&src[bank_pos], bank_len);
char *type = bank_type(&src[bank_pos], bank_len), *outname;
if (bank_num > 0) {
if ((outname = output_fname(fname, "bank%02X.abk", bank_num))) {
printf("%s: extracting bank %d (%s) as %s (%d bytes)\n",
fname, bank_num, type, outname, bank_len);
write_file(outname, &src[bank_pos], bank_len);
amos_bank(outname, &src[bank_pos], bank_len);
free(outname);
}
else {
perror(fname);
}
}
bank_pos += bank_len;
}
}
}
void amos_source(char *fname, uint8_t *src, size_t len) {
if (len < 30) {
fprintf(stderr, "%s: file too short to be AMOS source code\n", fname);
}
else {
uint32_t src_len = amos_leek(&src[16]) + 20;
char hdr[17] = {0};
memcpy(hdr, src, 16);
printf("%s: AMOS source code with header '%s'\n", fname, hdr);
/* parse banks after source code */
if (src_len < len) {
amos_banks(fname, &src[src_len], len - src_len);
}
}
}
void amos_file(char *fname, uint8_t *src, size_t len) {
if (len < 4) {
fprintf(stderr, "%s: file too short to be an AMOS file\n", fname);
}
else {
switch (amos_leek(src)) {
case ID_AMOS:
amos_source(fname, src, len);
break;
case ID_AmBs:
printf("%s: AMOS banks\n", fname);
amos_banks(fname, src, len);
break;
case ID_AmBk:
case ID_AmSp:
case ID_AmIc:
printf("%s: AMOS bank (%s)\n", fname, bank_type(src, len));
amos_bank(fname, src, len);
break;
default:
fprintf(stderr, "%s: not an AMOS source file or bank\n", fname);
}
}
}
int main(int argc, char *argv[]) {
if (argc <= 1) {
printf("Extract the contents of AMOS source code and memory banks.\n");
printf("Usage: %s [-p] <file.AMOS, file.abk, file.abs, ...>\n", argv[0]);
printf("Options:\n"
" -p Prefix removal\n");
return 1;
}
for (int i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-p")) {
use_prefix = 1;
}
else {
char *fname = argv[i];
uint8_t *buf;
size_t len;
if ((buf = read_file(fname, &len))) {
amos_file(fname, buf, len);
free(buf);
}
}
}
return 0;
}