ZX Spectrum TAP pattern for ImHex

tap.hexpat

#pragma description ZX Spectrum TAP
#pragma endian little

import std.mem;

enum Flag: u8 {
    Header = 0,
    Body = 255
};

enum Type: u8 {
    Program = 0,
    NumberArray = 1,
    CharacterArray = 2,
    Byte = 3
};

struct Block {
    u16 length;
    Flag flag;
    
    if (flag == Flag::Header) {
        Type type;
        char filename[10];
        u16 datalen;

        if (type == Type::Program) {
            u16 startline;
            u16 programlen;
        }
        else if (type == Type::Byte) {
            u16 startaddr;
            u8 reserved[2];
        }
        else {
            u8 reserved1;
            u8 varname;
            u8 reserved2[2];
        }
    }
    else {
        u8 data[length - 2];
    }

    u8 checksum;
};

struct Tape {
    Block block[while($ < std::mem::size())];
};

Tape tape @ 0x00 [[comment("Tape"), name("Tape")]];