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author Miodrag Milanovic <mmicko@gmail.com>2015-11-08 12:56:12 +0100
committer Miodrag Milanovic <mmicko@gmail.com>2015-11-08 12:56:12 +0100
commit7c19aac60e12d6f5ea301bdb34d7826a01e0b06f (patch)
treef310d86aa2c6bfc19d115307dedde4eb0cd52dad /src/lib/formats/ami_dsk.cpp
parenta57b46ae933badd7441ce1644711dbb851e2b504 (diff)
Rename *.c -> *.cpp in our source (nw)
Diffstat (limited to 'src/lib/formats/ami_dsk.cpp')
-rw-r--r--src/lib/formats/ami_dsk.cpp169
1 files changed, 169 insertions, 0 deletions
diff --git a/src/lib/formats/ami_dsk.cpp b/src/lib/formats/ami_dsk.cpp
new file mode 100644
index 00000000000..a222208d46d
--- /dev/null
+++ b/src/lib/formats/ami_dsk.cpp
@@ -0,0 +1,169 @@
+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+/*********************************************************************
+
+ formats/ami_dsk.c
+
+ Amiga disk images
+
+*********************************************************************/
+
+#include <assert.h>
+
+#include "formats/ami_dsk.h"
+
+adf_format::adf_format() : floppy_image_format_t()
+{
+}
+
+const char *adf_format::name() const
+{
+ return "adf";
+}
+
+const char *adf_format::description() const
+{
+ return "Amiga ADF floppy disk image";
+}
+
+const char *adf_format::extensions() const
+{
+ return "adf";
+}
+
+bool adf_format::supports_save() const
+{
+ return true;
+}
+
+int adf_format::identify(io_generic *io, UINT32 form_factor)
+{
+ UINT64 size = io_generic_size(io);
+ if ((size == 901120) || (size == 912384) || (size == 1802240))
+ {
+ return 50;
+ }
+ return 0;
+}
+
+bool adf_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
+{
+ desc_s sectors[22];
+ UINT8 sectdata[512*22];
+ bool is_hd = false;
+ int tracks = 80;
+
+ for(int i=0; i<22; i++) {
+ sectors[i].data = sectdata + 512*i;
+ sectors[i].size = 512;
+ sectors[i].sector_id = i;
+ }
+
+ UINT64 size = io_generic_size(io);
+ if(size == 901120)
+ {
+ is_hd = false;
+ tracks = 80;
+ }
+ else if (size == 912384)
+ {
+ is_hd = false;
+ tracks = 81;
+ }
+ else
+ {
+ is_hd = true;
+ tracks = 80;
+ }
+
+ if (!is_hd) {
+ image->set_variant(floppy_image::DSDD);
+ for(int track=0; track < tracks; track++) {
+ for(int side=0; side < 2; side++) {
+ io_generic_read(io, sectdata, (track*2 + side)*512*11, 512*11);
+ generate_track(amiga_11, track, side, sectors, 11, 100000, image);
+ }
+ }
+ } else {
+ image->set_variant(floppy_image::DSHD);
+ for(int track=0; track < tracks; track++) {
+ for(int side=0; side < 2; side++) {
+ io_generic_read(io, sectdata, (track*2 + side)*512*22, 512*22);
+ generate_track(amiga_22, track, side, sectors, 22, 200000, image);
+ }
+ }
+ }
+
+ return true;
+}
+
+UINT32 adf_format::g32(const UINT8 *trackbuf, int track_size, int pos)
+{
+ if(pos >= 0 && track_size-pos >= 40) {
+ int pp = pos >> 3;
+ int dp = pos & 7;
+ return
+ (trackbuf[pp] << (24+dp)) |
+ (trackbuf[pp+1] << (16+dp)) |
+ (trackbuf[pp+2] << (8+dp)) |
+ (trackbuf[pp+3] << dp) |
+ (trackbuf[pp+4] >> (8-dp));
+ } else {
+ UINT32 res = 0;
+ for(int i=0; i<32; i++) {
+ int pp = (pos+i) % track_size;
+ if(trackbuf[pp>>3] & (0x80 >> (pp & 7)))
+ res |= 0x80000000 >> i;
+ }
+ return res;
+ }
+}
+
+UINT32 adf_format::checksum(const UINT8 *trackbuf, int track_size, int pos, int long_count)
+{
+ UINT32 check = 0;
+ for(int i=0; i<long_count; i++)
+ check ^= g32(trackbuf, track_size, pos+32*i);
+ return check & 0x55555555;
+}
+
+bool adf_format::save(io_generic *io, floppy_image *image)
+{
+ UINT8 sectdata[512*22];
+ UINT8 trackbuf[300000/8];
+
+ bool hd = image->get_variant() == floppy_image::DSHD;
+
+ int data_track_size = hd ? 512*22 : 512*11;
+
+ for(int track=0; track < 80; track++) {
+ for(int side=0; side < 2; side++) {
+ int track_size;
+ generate_bitstream_from_track(track, side, hd ? 1000 : 2000, trackbuf, track_size, image);
+
+ for(int i=0; i<track_size; i++)
+ if(g32(trackbuf, track_size, i) == 0x44894489 &&
+ (g32(trackbuf, track_size, i+384) & 0x55555555) == checksum(trackbuf, track_size, i+32, 10) &&
+ (g32(trackbuf, track_size, i+448) & 0x55555555) == checksum(trackbuf, track_size, i+480, 256)) {
+ UINT32 head = ((g32(trackbuf, track_size, i+32) & 0x55555555) << 1) | (g32(trackbuf, track_size, i+64) & 0x55555555);
+ int sect = (head >> 8) & 0xff;
+ if(sect > (hd ? 22 : 11))
+ continue;
+
+ UINT8 *dest = sectdata + 512*sect;
+ for(int j=0; j<128; j++) {
+ UINT32 val = ((g32(trackbuf, track_size, i+480+32*j) & 0x55555555) << 1) | (g32(trackbuf, track_size, i+4576+32*j) & 0x55555555);
+ *dest++ = val >> 24;
+ *dest++ = val >> 16;
+ *dest++ = val >> 8;
+ *dest++ = val;
+ }
+
+ io_generic_write(io, sectdata, (track*2 + side)*data_track_size, data_track_size);
+ }
+ }
+ }
+ return true;
+}
+
+const floppy_format_type FLOPPY_ADF_FORMAT = &floppy_image_format_creator<adf_format>;