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5a098b9d00
if the media class doesn't exist (eg, hard drive with no hard drive controller) it's added but not displayed.
278 lines
7.2 KiB
Objective-C
278 lines
7.2 KiB
Objective-C
//
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// Media.m
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// Ample
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//
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// Created by Kelvin Sherlock on 3/7/2021.
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// Copyright © 2021 Kelvin Sherlock. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import "Media.h"
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const Media EmptyMedia = { 0 };
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struct Media MediaFromDictionary(NSDictionary *dict) {
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Media m = { 0 };
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#define _(name) m.name = [[dict objectForKey: @ # name] unsignedIntValue]
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_(cass);
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_(cdrom);
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_(hard);
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_(floppy_3_5);
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_(floppy_5_25);
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_(pseudo_disk);
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_(bitbanger);
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return m;
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#undef _
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}
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void MediaAdd(Media *dest, const Media *src) {
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if (!src || !dest) return;
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#define _(name) dest->name += src->name;
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_(cass);
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_(cdrom);
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_(hard);
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_(floppy_3_5);
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_(floppy_5_25);
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_(pseudo_disk);
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_(bitbanger);
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#undef _
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}
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BOOL MediaEqual(const Media *lhs, const Media *rhs) {
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if (lhs == rhs) return YES;
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if (!lhs || !rhs) return NO;
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#define _(name) if (lhs->name != rhs->name) return NO;
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_(cass);
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_(cdrom);
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_(hard);
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_(floppy_3_5);
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_(floppy_5_25);
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_(pseudo_disk);
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_(bitbanger);
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return YES;
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#undef _
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}
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#include <unistd.h>
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#include <sys/stat.h>
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#define _x2(a,b) (a | (b << 8))
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#define _x3(a,b,c) (a | (b << 8) | (c << 16))
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#define _x4(a,b,c, d) (a | (b << 8) | (c << 16) | (d << 24))
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static unsigned hash(const char *cp) {
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unsigned rv = 0;
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int i, shift;
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if (!cp) return 0;
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for (i = 0, shift = 0; i < 4; ++i, shift += 8) {
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unsigned c = cp[i];
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if (!c) break;
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c = tolower(c);
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rv |= (c << shift);
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}
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//if (i > 4) return 0; // .image is 5....
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return rv;
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}
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const char *extname(const char *path) {
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const char *rv = NULL;
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if (!path) return path;
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for(unsigned i = 0; ; ++i) {
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unsigned c = path[i];
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if (c == 0) break;
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if (c == '/') rv = NULL;
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if (c == '.') rv = path + i + 1;
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}
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if (rv && !*rv) rv = NULL;
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return rv;
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}
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/*
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* MAME cares deeply about file extensions. LIST NOT EXHAUSTIVE
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*
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* Hard Disk: .chd .hd .hdv .2mg .hdi
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* CD-ROM: .chd .cue .toc .nrg .gdi .iso .cdr
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* 5.25: .dsk .do .po .edd .woz .nib .mfi .dfi .rti
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* 3.5: .dc42 .woz .2mg .mfi .dfi .hfe .mfm .td0 .imd
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.d77 .d88 .1dd .cqm .cqi .dsk .ima .img .ufi
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.360 .ipf [also .po and .hdv]
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* Midi in: .mid
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* Midi out: .mid
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* Picture: .png
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* Cassette: .wav
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*/
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static bool is_raw_525(size_t disk_size) {
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if (disk_size & 255) return NO;
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size_t blocks = disk_size >> 8;
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return blocks == 560 || blocks == 640;
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}
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static BOOL is_raw_35(size_t disk_size) {
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if (disk_size & 511) return NO;
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size_t blocks = disk_size >> 9;
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return blocks == 800 || blocks == 1600 || blocks == 1440 || blocks == 2880;
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}
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static MediaType is_woz(const uint8_t *buffer, size_t file_size) {
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/* woz 1/2 ? */
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if (!memcmp(buffer, "WOZ1\xff\x0a\x0d\x0a", 8) || !memcmp(buffer, "WOZ2\xff\x0a\x0d\x0a", 8)) {
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if (!memcmp(buffer + 12, "INFO", 4)) {
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unsigned type = buffer[21]; // 1 = 5.25, 2 = 3.5
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if (type == 1) return MediaType_5_25;
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if (type == 2) return MediaType_3_5;
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}
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return MediaTypeUnknown;
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}
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return MediaTypeError;
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}
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static MediaType is_dc42(const uint8_t *buffer, size_t file_size) {
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if (buffer[0x52] == 0x01 && buffer[0x53] == 0x00 && buffer[0] >= 1 && buffer[0] <= 0x3f) {
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int dsize = OSReadBigInt32(buffer, 0x40);
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int tsize = OSReadBigInt32(buffer, 0x44);
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if (dsize + tsize + 0x54 == file_size) {
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if (is_raw_35(dsize)) return MediaType_3_5;
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return MediaType_HardDisk;
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}
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}
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return MediaTypeError;
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}
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static MediaType is_2img(const uint8_t *buffer, size_t file_size) {
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if (!memcmp(buffer, "2IMG", 4)) {
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int format = OSReadLittleInt32(buffer, 0x0c); // 0 - dos order, 1 = prodos order, 2 = nib data
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int blocks = OSReadLittleInt32(buffer, 0x14); // prodos only.
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//int bytes = OSReadLittleInt32(buffer, 0x1c);
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if (format == 2 || format == 0) return MediaType_5_25; // nib and dos order
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if (is_raw_525(blocks * 512)) return MediaType_5_25;
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if (is_raw_35(blocks * 512)) return MediaType_3_5;
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return MediaType_HardDisk; //
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//return MediaTypeUnknown;
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}
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return MediaTypeError;
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}
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static MediaType is_chd(const uint8_t *buffer, size_t file_size) {
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if (!memcmp(buffer, "MComprHD", 8)) {
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static int offsets[] = { 0, 0, 0, 28, 28, 32}; // offset for logival bytes.
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int version = OSReadBigInt32(buffer, 12);
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if (version >= 3 && version <= 5) {
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long bytes = OSReadBigInt64(buffer, offsets[version]);
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if (is_raw_525(bytes)) return MediaType_5_25;
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if (is_raw_35(bytes)) return MediaType_3_5;
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return MediaType_HardDisk; // iso?
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}
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return MediaTypeUnknown;
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}
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return MediaTypeError;
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}
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MediaType ClassifyMediaFile(id file) {
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struct stat st;
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ssize_t size;
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unsigned char buffer[128];
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int fd;
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const char *path = [file fileSystemRepresentation]; // or URL
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const char *ext = extname(path);
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unsigned ext_hash = hash(ext);
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memset(&st, 0, sizeof(st));
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memset(buffer, 0, sizeof(buffer));
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fd = open(path, O_RDONLY);
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if (fd < 0) return MediaTypeError;
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fstat(fd, &st);
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size = read(fd, buffer, sizeof(buffer));
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close(fd);
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if (size <= 0) return MediaTypeError;
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// 13 sector support ? not on an event 512 block boundary.
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// = 116480 bytes.
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switch(ext_hash) {
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case _x3('w', 'o', 'z'):
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return is_woz(buffer, st.st_size);
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case _x3('2', 'm', 'g'):
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case _x4('2', 'i', 'm', 'g'):
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return is_2img(buffer, st.st_size);
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case _x3('c', 'h', 'd'):
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return is_chd(buffer, st.st_size);
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// dc42 - dc,dc42,dsk,img,image
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case _x2('d', 'c'): // n.b. as of .233, allowed for mac, not for apple2
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case _x4('d', 'c', '4', '2'):
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return is_dc42(buffer, st.st_size);
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// dsk, image, img may also be raw or disk copy.
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case _x3('d', 's', 'k'):
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case _x3('i', 'm', 'g'):
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case _x4('i', 'm', 'a', 'g'):
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if (is_raw_525(st.st_size)) return MediaType_5_25;
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if (is_raw_35(st.st_size)) return MediaType_3_5;
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return is_dc42(buffer, st.st_size);
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case _x2('d', 'o'):
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case _x2('p', 'o'):
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if (is_raw_525(st.st_size)) return MediaType_5_25;
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if (is_raw_35(st.st_size)) return MediaType_3_5;
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return MediaTypeUnknown;
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// hdv - 3.5 or hard drive.
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case _x3('h', 'd', 'v'):
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case _x3('r', 'a', 'w'):
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if (is_raw_35(st.st_size)) return MediaType_3_5;
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if ((st.st_size & 511) == 0) return MediaType_HardDisk;
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return MediaTypeUnknown;
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case _x3('n', 'i', 'b'):
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return MediaType_5_25;
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case _x3('w', 'a', 'v'):
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return MediaType_Cassette;
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// cd-rom
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case _x3('i', 's', 'o'):
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case _x3('c', 'u', 'e'):
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case _x3('c', 'd', 'r'):
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return MediaType_CDROM;
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case _x3('p', 'n', 'g'):
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return MediaType_Picture;
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case _x3('m', 'i', 'd'):
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return MediaType_MIDI;
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}
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return MediaTypeUnknown;
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}
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