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ample/Ample/Media.m

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//
// Media.m
// Ample
//
// Created by Kelvin Sherlock on 3/7/2021.
// Copyright © 2021 Kelvin Sherlock. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Media.h"
const Media EmptyMedia = { 0 };
struct Media MediaFromDictionary(NSDictionary *dict) {
Media m = { 0 };
#define _(name) m.name = [[dict objectForKey: @ # name] unsignedIntValue]
_(cass);
_(cdrom);
_(hard);
_(floppy_3_5);
_(floppy_5_25);
_(floppy_8);
_(pseudo_disk);
_(bitbanger);
_(midiin);
_(midiout);
_(picture);
_(rom);
return m;
#undef _
}
void MediaAdd(Media *dest, const Media *src) {
if (!src || !dest) return;
// could merge from src media but not currently set there.
//unsigned count;
unsigned dest_flops = dest->floppy_8 + dest->floppy_5_25 + dest->floppy_3_5;
unsigned src_flops = src->floppy_8 || src->floppy_5_25 || src->floppy_3_5;
#define _(name) dest->name += src->name;
_(cass);
_(cdrom);
_(hard);
_(floppy_3_5);
_(floppy_5_25);
_(floppy_8);
_(pseudo_disk);
_(bitbanger);
_(midiin);
_(midiout);
_(picture);
_(rom);
#undef _
// this assumes any device that supports more than 1 floppy size
// the order is 8" < 5.25" < 3.5"
if (src_flops) {
uint64_t bits = 1 << dest_flops;
for (unsigned i = 0; i < src->floppy_8; ++i) {
dest->floppy_mask_8 |= bits;
bits <<= 1;
}
for (unsigned i = 0; i < src->floppy_5_25; ++i) {
dest->floppy_mask_5_25 |= bits;
bits <<= 1;
}
for (unsigned i = 0; i < src->floppy_3_5; ++i) {
dest->floppy_mask_3_5 |= bits;
bits <<= 1;
}
}
}
BOOL MediaEqual(const Media *lhs, const Media *rhs) {
if (lhs == rhs) return YES;
if (!lhs || !rhs) return NO;
#define _(name) if (lhs->name != rhs->name) return NO;
_(cass);
_(cdrom);
_(hard);
_(floppy_3_5);
_(floppy_5_25);
_(floppy_8);
_(pseudo_disk);
_(bitbanger);
_(midiin);
_(midiout);
_(picture);
_(rom);
_(floppy_mask_8);
_(floppy_mask_5_25);
_(floppy_mask_3_5);
return YES;
#undef _
}
#include <unistd.h>
#include <sys/stat.h>
#define _x2(a,b) (a | (b << 8))
#define _x3(a,b,c) (a | (b << 8) | (c << 16))
#define _x4(a,b,c, d) (a | (b << 8) | (c << 16) | (d << 24))
static unsigned hash(const char *cp) {
unsigned rv = 0;
int i, shift;
if (!cp) return 0;
for (i = 0, shift = 0; i < 4; ++i, shift += 8) {
unsigned c = cp[i];
if (!c) break;
c = tolower(c);
rv |= (c << shift);
}
//if (i > 4) return 0; // .image is 5....
return rv;
}
const char *extname(const char *path) {
const char *rv = NULL;
if (!path) return path;
for(unsigned i = 0; ; ++i) {
unsigned c = path[i];
if (c == 0) break;
if (c == '/') rv = NULL;
if (c == '.') rv = path + i + 1;
}
if (rv && !*rv) rv = NULL;
return rv;
}
/*
* MAME cares deeply about file extensions. LIST NOT EXHAUSTIVE
*
* Hard Disk: .chd .hd .hdv .2mg .hdi
* CD-ROM: .chd .cue .toc .nrg .gdi .iso .cdr
* 5.25: .dsk .do .po .edd .woz .nib .mfi .dfi .rti
* 3.5: .dc42 .woz .2mg .mfi .dfi .hfe .mfm .td0 .imd
.d77 .d88 .1dd .cqm .cqi .dsk .ima .img .ufi
.360 .ipf [also .po and .hdv]
* Midi in: .mid
* Midi out: .mid
* Picture: .png
* Cassette: .wav
*/
static bool is_raw_525(size_t disk_size) {
if (disk_size & 255) return NO;
size_t blocks = disk_size >> 8;
return blocks == 560 || blocks == 640;
}
static BOOL is_raw_35(size_t disk_size) {
if (disk_size & 511) return NO;
size_t blocks = disk_size >> 9;
// atari st has 360 (single sided) and 720 (double-sided) disks..
return blocks == 800 || blocks == 1600 || blocks == 1440 || blocks == 2880 || blocks == 720 || blocks == 360;
}
static MediaType is_woz(const uint8_t *buffer, size_t file_size) {
/* woz 1/2 ? */
if (!memcmp(buffer, "WOZ1\xff\x0a\x0d\x0a", 8) || !memcmp(buffer, "WOZ2\xff\x0a\x0d\x0a", 8)) {
if (!memcmp(buffer + 12, "INFO", 4)) {
unsigned type = buffer[21]; // 1 = 5.25, 2 = 3.5
if (type == 1) return MediaType_5_25;
if (type == 2) return MediaType_3_5;
}
return MediaTypeUnknown;
}
return MediaTypeError;
}
static MediaType is_dc42(const uint8_t *buffer, size_t file_size) {
if (buffer[0x52] == 0x01 && buffer[0x53] == 0x00 && buffer[0] >= 1 && buffer[0] <= 0x3f) {
int dsize = OSReadBigInt32(buffer, 0x40);
int tsize = OSReadBigInt32(buffer, 0x44);
if (dsize + tsize + 0x54 == file_size) {
if (is_raw_35(dsize)) return MediaType_3_5;
return MediaType_HardDisk;
}
}
return MediaTypeError;
}
static MediaType is_2img(const uint8_t *buffer, size_t file_size) {
if (!memcmp(buffer, "2IMG", 4)) {
int format = OSReadLittleInt32(buffer, 0x0c); // 0 - dos order, 1 = prodos order, 2 = nib data
int blocks = OSReadLittleInt32(buffer, 0x14); // prodos only.
//int bytes = OSReadLittleInt32(buffer, 0x1c);
if (format == 2 || format == 0) return MediaType_5_25; // nib and dos order
if (is_raw_525(blocks * 512)) return MediaType_5_25;
if (is_raw_35(blocks * 512)) return MediaType_3_5;
return MediaType_HardDisk; //
//return MediaTypeUnknown;
}
return MediaTypeError;
}
static MediaType is_chd(const uint8_t *buffer, size_t file_size) {
if (!memcmp(buffer, "MComprHD", 8)) {
static int offsets[] = { 0, 0, 0, 28, 28, 32}; // offset for logival bytes.
int version = OSReadBigInt32(buffer, 12);
if (version >= 3 && version <= 5) {
long bytes = OSReadBigInt64(buffer, offsets[version]);
if (is_raw_525(bytes)) return MediaType_5_25;
if (is_raw_35(bytes)) return MediaType_3_5;
return MediaType_HardDisk; // iso?
}
return MediaTypeUnknown;
}
return MediaTypeError;
}
static MediaType is_ipf(const uint8_t *buffer, size_t file_size) {
// http://justsolve.archiveteam.org/wiki/IPF
if (!memcmp(buffer, "CAPS\x00\x00\x00", 7)) return MediaType_3_5;
return MediaTypeUnknown;
}
static MediaType is_hxcf(const uint8_t *buffer, size_t file_size) {
// HxCFloppyEmulator
if (!memcmp(buffer, "HXCMFM", 6)) return MediaType_3_5;
return MediaTypeUnknown;
}
static MediaType is_msa(const uint8_t *buffer, size_t file_size) {
// Atari MSA
if (!memcmp(buffer, "\x0x\x0f", 2)) return MediaType_3_5;
return MediaTypeUnknown;
}
static MediaType is_pasti(const uint8_t *buffer, size_t file_size) {
// Atari STX/Pasti
if (!memcmp(buffer, "RSY\x00\x03\x00", 6)) return MediaType_3_5;
return MediaTypeUnknown;
}
MediaType ClassifyMediaFile(id file) {
struct stat st;
ssize_t size;
unsigned char buffer[128];
int fd;
const char *path = [file fileSystemRepresentation]; // or URL
const char *ext = extname(path);
unsigned ext_hash = hash(ext);
memset(&st, 0, sizeof(st));
memset(buffer, 0, sizeof(buffer));
fd = open(path, O_RDONLY);
if (fd < 0) return MediaTypeError;
fstat(fd, &st);
size = read(fd, buffer, sizeof(buffer));
close(fd);
if (size <= 0) return MediaTypeError;
// 13 sector support ? not on an event 512 block boundary.
// = 116480 bytes.
switch(ext_hash) {
case _x3('w', 'o', 'z'):
return is_woz(buffer, st.st_size);
case _x3('2', 'm', 'g'):
case _x4('2', 'i', 'm', 'g'):
return is_2img(buffer, st.st_size);
case _x3('c', 'h', 'd'):
return is_chd(buffer, st.st_size);
// dc42 - dc,dc42,dsk,img,image
case _x2('d', 'c'): // n.b. as of .233, allowed for mac, not for apple2
case _x4('d', 'c', '4', '2'):
return is_dc42(buffer, st.st_size);
// dsk, image, img may also be raw or disk copy.
case _x3('d', 's', 'k'):
case _x3('i', 'm', 'g'):
case _x4('i', 'm', 'a', 'g'):
if (is_raw_525(st.st_size)) return MediaType_5_25;
if (is_raw_35(st.st_size)) return MediaType_3_5;
return is_dc42(buffer, st.st_size);
case _x2('d', 'o'):
case _x2('p', 'o'):
if (is_raw_525(st.st_size)) return MediaType_5_25;
if (is_raw_35(st.st_size)) return MediaType_3_5;
return MediaTypeUnknown;
// hdv - 3.5 or hard drive.
case _x3('h', 'd', 'v'):
case _x3('r', 'a', 'w'):
if (is_raw_35(st.st_size)) return MediaType_3_5;
if ((st.st_size & 511) == 0) return MediaType_HardDisk;
return MediaTypeUnknown;
case _x3('n', 'i', 'b'):
return MediaType_5_25;
case _x3('w', 'a', 'v'):
return MediaType_Cassette;
// cd-rom
case _x3('i', 's', 'o'):
case _x3('c', 'u', 'e'):
case _x3('c', 'd', 'r'):
return MediaType_CDROM;
case _x3('p', 'n', 'g'):
return MediaType_Picture;
case _x3('m', 'i', 'd'):
return MediaType_MIDI;
// atari st, etc, 3.5 disk?
// http://justsolve.archiveteam.org/wiki/Disk_Image_Formats
case _x3('i', 'p', 'f'):
return is_ipf(buffer, st.st_size);
case _x3('m', 'f', 'm'):
return is_hxcf(buffer, st.st_size);
case _x3('m', 's', 'a'):
return is_msa(buffer, st.st_size);
case _x2('s', 't'):
if (is_raw_35(st.st_size)) return MediaType_3_5;
return MediaTypeUnknown;
case _x3('s', 't', 'x'): // pasti
return is_pasti(buffer, st.st_size);
//case _x3('m', 'f', 'i'): // mame/mess floppy image [???]
//case _x3('d', 'f', 'i'): // disc ferret image
//case _x3('h', 'f', 'e'): // ???
//case _x3('t', 'd', '0'): // teledisk - may be split across multiple files (.td1, .td2, ...)
//case _x3('i', 'm', 'd'): // imagedisk
//case _x3('d', '7', '7'): //pc-88, may have multiple disk images
//case _x3('d', '8', '8'): //fm-77, may have multiple disk images.
//case _x3('1', 'd', 'd'): // related?
//case _x3('c', 'q', 'm'): // copyQM
//case _x3('c', 'q', 'i'): // copyQM
case _x3('r', 'o', 'm'):
case _x3('b', 'i', 'n'):
return MediaType_ROM;
}
return MediaTypeUnknown;
}
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