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