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50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
#ifndef SCP_H
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#define SCP_H
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struct ScpHeader
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{
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char file_id[3]; // file ID - 'SCP'
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uint8_t version; // major/minor in nibbles
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uint8_t type; // disk type - subclass/class in nibbles
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uint8_t revolutions; // up to 5
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uint8_t start_track; // 0..165
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uint8_t end_track; // 0..165
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uint8_t flags; // see below
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uint8_t cell_width; // in bits, 0 meaning 16
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uint8_t heads; // 0 = both, 1 = side 0 only, 2 = side 1 only
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uint8_t resolution; // 25ns * (resolution+1)
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uint8_t checksum[4]; // of data after this point
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uint8_t track[168][4]; // track offsets, not necessarily 168
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};
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enum
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{
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SCP_FLAG_INDEXED = (1 << 0),
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SCP_FLAG_96TPI = (1 << 1),
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SCP_FLAG_360RPM = (1 << 2),
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SCP_FLAG_NORMALIZED = (1 << 3),
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SCP_FLAG_READWRITE = (1 << 4),
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SCP_FLAG_FOOTER = (1 << 5)
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};
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struct ScpTrackHeader
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{
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char track_id[3]; // 'TRK'
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uint8_t strack; // SCP track number
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};
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struct ScpTrackRevolution
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{
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uint8_t index[4]; // time for one revolution
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uint8_t length[4]; // number of bitcells
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uint8_t offset[4]; // offset to bitcell data, relative to track header
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};
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struct ScpTrack
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{
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ScpTrackHeader header;
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ScpTrackRevolution revolution[5];
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};
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#endif
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