From a6b326da4831ef6fac5e279e0cee497a3022ebfc Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sat, 25 Dec 2021 18:17:13 -0500
Subject: [PATCH] Parse the INFO record.

---
 Storage/Disk/DiskImage/Formats/IPF.cpp | 50 ++++++++++++++++++++++++--
 Storage/Disk/DiskImage/Formats/IPF.hpp |  4 +--
 2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/Storage/Disk/DiskImage/Formats/IPF.cpp b/Storage/Disk/DiskImage/Formats/IPF.cpp
index 45220eb8e..5720b44ab 100644
--- a/Storage/Disk/DiskImage/Formats/IPF.cpp
+++ b/Storage/Disk/DiskImage/Formats/IPF.cpp
@@ -39,6 +39,52 @@ IPF::IPF(const std::string &file_name) : file_(file_name) {
 				}
 			break;
 
+			case BLOCK('I', 'N', 'F', 'O'): {
+				// There are a lot of useful archival fields in the info chunk, which for emulation
+				// aren't that interesting.
+
+				// Make sure this is a floppy disk.
+				const uint32_t media_type = file_.get32be();
+				if(media_type != 1) {
+					throw Error::InvalidFormat;
+				}
+
+				// Skip: encoder type, revision, file key and revision, CRC of the original .ctr, and minimum track.
+				file_.seek(24, SEEK_CUR);
+				track_count_ = int(1 + file_.get32be());
+
+				// Skip: min side.
+				file_.seek(4, SEEK_CUR);
+				head_count_ = int(1 + file_.get32be());
+
+				// Skip: creation date, time.
+				file_.seek(8, SEEK_CUR);
+
+				platform_type_ = 0;
+				for(int c = 0; c < 4; c++) {
+					const uint8_t platform = file_.get8();
+					switch(platform) {
+						default: break;
+						case 1:	platform_type_ |= TargetPlatform::Amiga;		break;
+						case 2:	platform_type_ |= TargetPlatform::AtariST;		break;
+						/* Omitted: 3 -> IBM PC */
+						case 4:	platform_type_ |= TargetPlatform::AmstradCPC;	break;
+						case 5:	platform_type_ |= TargetPlatform::ZXSpectrum;	break;
+						/* Omitted: 6 -> Sam Coupé */
+						/* Omitted: 7 -> Archimedes */
+						/* Omitted: 8 -> C64 */
+						/* Omitted: 9 -> Atari 8-bit */
+					}
+				}
+
+				// If the file didn't declare anything, default to supporting everything.
+				if(!platform_type_) {
+					platform_type_ = ~0;
+				}
+
+				// Ignore: disk number, creator ID, reserved area.
+			} break;
+
 			case BLOCK('D', 'A', 'T', 'A'): {
 				length += file_.get32be();
 				printf("Handling DATA block at %ld of length %d\n", start_of_block, length);
@@ -51,11 +97,11 @@ IPF::IPF(const std::string &file_name) : file_(file_name) {
 }
 
 HeadPosition IPF::get_maximum_head_position() {
-	return HeadPosition(80); // TODO;
+	return HeadPosition(track_count_);
 }
 
 int IPF::get_head_count() {
-	return 2; // TODO;
+	return head_count_;
 }
 
 std::shared_ptr<Track> IPF::get_track_at_position([[maybe_unused]] Track::Address address) {
diff --git a/Storage/Disk/DiskImage/Formats/IPF.hpp b/Storage/Disk/DiskImage/Formats/IPF.hpp
index b7f08a52b..ad016f29a 100644
--- a/Storage/Disk/DiskImage/Formats/IPF.hpp
+++ b/Storage/Disk/DiskImage/Formats/IPF.hpp
@@ -45,9 +45,9 @@ class IPF: public DiskImage, public TargetPlatform::TypeDistinguisher {
 		int track_count_;
 
 		TargetPlatform::Type target_platform_type() final {
-			return platform_type_;
+			return TargetPlatform::Type(platform_type_);
 		}
-		TargetPlatform::Type platform_type_ = TargetPlatform::Amiga;
+		TargetPlatform::IntType platform_type_ = TargetPlatform::Amiga;
 };
 
 }