Added WOZ 2 support.

[apple2] / src / fileio.h

diff --git a/src/fileio.h b/src/fileio.h
new file mode 100644 (file)
index 0000000..db11d87
--- /dev/null
+++ b/src/fileio.h
@@ -0,0 +1,133 @@
+#ifndef __FILEIO_H__
+#define __FILEIO_H__
+
+#include <SDL.h>
+#include <stdio.h>
+#include <stdint.h>
+
+// N.B.: All 32/16-bit values are stored in little endian.  Which means, to
+//       read/write them safely, we need to use translators as this code may or
+//       may not be compiled on an architecture that supports little endian
+//       natively.
+
+struct WOZ1Track
+{
+       uint8_t bits[6646];
+       uint16_t byteCount;
+       uint16_t bitCount;
+       uint16_t splicePoint;
+       uint8_t spliceNibble;
+       uint8_t spliceBitCount;
+       uint16_t reserved;
+};
+
+struct WOZMetadata
+{
+       uint8_t metaTag[4];             // "META"
+       uint32_t metaSize;              // Size of the META chunk
+       uint8_t data[];                 // Variable length array of metadata
+};
+
+struct WOZ1
+{
+       // Header
+       uint8_t magic[8];               // "WOZ1" $FF $0A $0D $0A
+       uint32_t crc32;                 // CRC32 of the remaining data in the file
+
+       // INFO chunk
+       uint8_t infoTag[4];             // "INFO"
+       uint32_t infoSize;              // Always 60 bytes long
+       uint8_t infoVersion;    // Currently 1
+       uint8_t diskType;               // 1 = 5 1/4", 2 = 3 1/2"
+       uint8_t writeProtected; // 1 = write protected disk
+       uint8_t synchronized;   // 1 = cross-track sync was used during imaging
+       uint8_t cleaned;                // 1 = fake bits removed from image
+       uint8_t creator[32];    // Software that made this image, padded with 0x20
+       uint8_t pad1[23];               // Padding to 60 bytes
+
+       // TMAP chunk
+       uint8_t tmapTag[4];             // "TMAP"
+       uint32_t tmapSize;              // Always 160 bytes long
+       uint8_t tmap[160];              // Track map, with empty tracks set to $FF
+
+       // TRKS chunk
+       uint8_t trksTag[4];             // "TRKS"
+       uint32_t trksSize;              // Varies, depending on # of tracks imaged
+       WOZ1Track track[];              // Variable length array for the track data proper
+};
+
+struct WOZTrack2
+{
+       uint16_t startingBlock; // 512 byte block # where this track starts (relative to the start of the file)
+       uint16_t blockCount;    // # of blocks in this track
+       uint32_t bitCount;              // # of bits in this track
+};
+
+struct WOZ2
+{
+       // Header
+       uint8_t magic[8];               // "WOZ2" $FF $0A $0D $0A
+       uint32_t crc32;                 // CRC32 of the remaining data in the file
+
+       // INFO chunk
+       uint8_t infoTag[4];             // "INFO"
+       uint32_t infoSize;              // Always 60 bytes long
+       uint8_t infoVersion;    // Currently 1
+       uint8_t diskType;               // 1 = 5 1/4", 2 = 3 1/2"
+       uint8_t writeProtected; // 1 = write protected disk
+       uint8_t synchronized;   // 1 = cross-track sync was used during imaging
+       uint8_t cleaned;                // 1 = fake bits removed from image
+       uint8_t creator[32];    // Software that made this image, padded with 0x20
+       uint8_t diskSides;              // 5 1/4" disks always have 1 side (v2 from here on)
+       uint8_t bootSectorFmt;  // 5 1/4" only (0=unknown, 1=16 sector, 2=13 sector, 3=both)
+       uint8_t optimalBitTmg;  // In ticks, standard for 5 1/4" is 32 (4 µs)
+       uint16_t compatibleHW;  // Bitfield showing hardware compatibility (1=][, 2=][+, 4=//e (unenh), 8=//c, 16=//e (enh), 32=IIgs, 64=//c+, 128=///, 256=///+)
+       uint16_t requiredRAM;   // Minimum size in K, 0=unknown
+       uint16_t largestTrack;  // Number of 512 byte blocks used by largest track
+       uint8_t pad1[14];               // Padding to 60 bytes
+
+       // TMAP chunk
+       uint8_t tmapTag[4];             // "TMAP"
+       uint32_t tmapSize;              // Always 160 bytes long
+       uint8_t tmap[160];              // Track map, with empty tracks set to $FF
+
+       // TRKS chunk
+       uint8_t trksTag[4];             // "TRKS"
+       uint32_t trksSize;              // Varies, depending on # of tracks imaged
+       WOZTrack2 track[160];   // Actual track info (corresponding to TMAP data)
+       uint8_t data[];                 // Variable length array for the track data proper
+};
+
+// Exported functions
+uint8_t * ReadFile(const char * filename, uint32_t * size);
+void InitWOZ2Headers(WOZ2 &);
+uint8_t * InitWOZ(uint32_t * pSize = NULL);
+uint8_t * UpconvertWOZ1ToWOZ2(uint8_t * woz1Data, uint32_t woz1Size, uint32_t * newSize);
+uint8_t CheckWOZType(const uint8_t * wozData, uint32_t wozSize);
+bool CheckWOZIntegrity(const uint8_t * wozData, uint32_t wozSize);
+bool SaveWOZ(const char * filename, WOZ2 * woz, uint32_t size);
+
+// Static in-line functions, for clarity & speed, mostly for reading values out
+// of the WOZ struct, which stores its data in LE; some for swapping variables
+static inline uint16_t Uint16LE(uint16_t v)
+{
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+       return ((v & 0xFF) << 8) | ((v & 0xFF00) >> 8);
+#else
+       return v;
+#endif
+}
+
+
+static inline uint32_t Uint32LE(uint32_t v)
+{
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+       return ((v & 0xFF) << 24) | ((v & 0xFF00) << 8)
+               | ((v & 0xFF0000) >> 8) | ((v & 0xFF000000) >> 24);
+#else
+       return v;
+#endif
+}
+
+#endif // __FILEIO_H__
+