summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/formats/apd_dsk.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/lib/formats/apd_dsk.cpp')
-rw-r--r--src/lib/formats/apd_dsk.cpp124
1 files changed, 124 insertions, 0 deletions
diff --git a/src/lib/formats/apd_dsk.cpp b/src/lib/formats/apd_dsk.cpp
new file mode 100644
index 00000000000..cd5de8ad206
--- /dev/null
+++ b/src/lib/formats/apd_dsk.cpp
@@ -0,0 +1,124 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/*********************************************************************
+
+ formats/apd_dsk.c
+
+ Archimedes Protected Disk Image format
+
+*********************************************************************/
+
+#include <zlib.h>
+#include "formats/apd_dsk.h"
+
+static const uint8_t APD_HEADER[8] = { 0x41, 0x50, 0x44, 0x58, 0x30, 0x30, 0x30, 0x31 };
+static const uint8_t GZ_HEADER[2] = { 0x1f, 0x8b };
+
+apd_format::apd_format()
+{
+}
+
+const char *apd_format::name() const
+{
+ return "apd";
+}
+
+const char *apd_format::description() const
+{
+ return "Archimedes Protected Disk Image";
+}
+
+const char *apd_format::extensions() const
+{
+ return "apd";
+}
+
+int apd_format::identify(io_generic *io, uint32_t form_factor)
+{
+ char h[8];
+
+ io_generic_read(io, h, 0, 8);
+ if (!memcmp(h, GZ_HEADER, sizeof(GZ_HEADER)) || !memcmp(h, APD_HEADER, sizeof(APD_HEADER))) {
+ return 100;
+ }
+
+ return 0;
+}
+
+bool apd_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
+{
+ uint64_t size = io_generic_size(io);
+ std::vector<uint8_t> img(size);
+ io_generic_read(io, &img[0], 0, size);
+
+ int err;
+ std::vector<uint8_t> gz_ptr;
+ z_stream d_stream;
+ int inflate_size = (img[size - 1] << 24) | (img[size - 2] << 16) | (img[size - 3] << 8) | img[size - 4];
+ uint8_t *in_ptr = &img[0];
+
+ gz_ptr.resize(inflate_size);
+
+ d_stream.zalloc = nullptr;
+ d_stream.zfree = nullptr;
+ d_stream.opaque = nullptr;
+ d_stream.next_in = in_ptr;
+ d_stream.avail_in = size;
+ d_stream.next_out = &gz_ptr[0];
+ d_stream.avail_out = inflate_size;
+
+ err = inflateInit2(&d_stream, MAX_WBITS | 16);
+ if (err != Z_OK) {
+ LOG_FORMATS("inflateInit2 error: %d\n", err);
+ return false;
+ }
+ err = inflate(&d_stream, Z_FINISH);
+ if (err != Z_STREAM_END && err != Z_OK) {
+ LOG_FORMATS("inflate error: %d\n", err);
+ return false;
+ }
+ err = inflateEnd(&d_stream);
+ if (err != Z_OK) {
+ LOG_FORMATS("inflateEnd error: %d\n", err);
+ return false;
+ }
+ size = inflate_size;
+ img = gz_ptr;
+
+ if (memcmp(&img[0], APD_HEADER, sizeof(APD_HEADER))) {
+ LOG_FORMATS("apd_dsk: floppy image has incorrect header\n");
+ return false;
+ }
+
+ int data = 0x7d0;
+ for (int track = 0; track < 83; track++) {
+ for (int side = 0; side < 2; side++) {
+ uint32_t sdlen = little_endianize_int32(*(uint32_t *)(&img[(track * 2 + side) * 12 + 8 + 0x0]));
+ uint32_t ddlen = little_endianize_int32(*(uint32_t *)(&img[(track * 2 + side) * 12 + 8 + 0x4]));
+ uint32_t qdlen = little_endianize_int32(*(uint32_t *)(&img[(track * 2 + side) * 12 + 8 + 0x8]));
+
+ if (sdlen > 0) {
+ generate_track_from_bitstream(track, side, &img[data], sdlen, image);
+ data += (sdlen + 7) >> 3;
+ }
+ if (ddlen > 0) {
+ generate_track_from_bitstream(track, side, &img[data], ddlen, image);
+ data += (ddlen + 7) >> 3;
+ }
+ if (qdlen > 0) {
+ generate_track_from_bitstream(track, side, &img[data], qdlen, image);
+ data += (qdlen + 7) >> 3;
+ }
+ }
+ }
+ image->set_variant(floppy_image::DSDD);
+
+ return true;
+}
+
+bool apd_format::supports_save() const
+{
+ return false;
+}
+
+const floppy_format_type FLOPPY_APD_FORMAT = &floppy_image_format_creator<apd_format>;