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https://github.com/WerWolv/ImHex-Patterns.git
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87 lines
1.7 KiB
Rust
87 lines
1.7 KiB
Rust
#pragma author gmestanley
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#pragma description .nes file format
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import std.mem;
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import std.string;
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bitfield iNES07Flags {
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mirroringIsVertical : 1;
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batterybackedPRGRAM : 1;
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trainerOf512Bytes : 1;
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ignoreMirroring : 1;
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mapperLowerNybble : 4;
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vsUnisystem : 1;
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playchoice10 : 1;
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nes2Format : 2 [[name("nes2.0Format")]];
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mapperHigherNybble : 4;
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} [[name("iNES0.7Flags")]];
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bitfield Flags9 {
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isPAL : 1;
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padding : 7;
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};
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bitfield Flags10 {
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tvSystem : 2;
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padding : 2;
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prgRAM : 1;
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busConflicts : 1;
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padding : 2;
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};
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struct iNESFlags {
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iNES07Flags ines07Flags [[name("ines0.7Flags")]];
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if (!ines07Flags.nes2Format) {
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u8 prgRAM8KBMultiplier;
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Flags9 flags9;
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Flags10 flags10;
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restLength = 5;
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}
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else {
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restLength = 9;
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}
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};
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u8 restLength;
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struct Header {
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char identifier[4];
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u8 prgROM16KBMultiplier;
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u8 chrROM8KBMultiplier;
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iNESFlags inesFlags;
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char rest[restLength];
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};
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Header header @ 0x00;
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enum EncodingType : u8 {
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ASCII = 1
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};
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struct OfficialHeader {
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char title[16] [[hex::spec_name("Title Registration Area")]];
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u16 programChecksum;
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u16 characterChecksum;
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u8 memorySize [[hex::spec_name("Cartridge Memory Size")]];
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u8 cartridgeType;
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EncodingType encodingType [[hex::spec_name("Registration Character Type Distinction")]];
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u8 titleLength [[hex::spec_name("Registration Characters Count")]];
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u8 makerID [[hex::spec_name("Maker Code")]];
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u8 complementaryChecksum;
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};
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union OfficialHeaderUnion {
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u8 miscellaneousData[26];
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OfficialHeader officialHeader;
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};
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struct PRGROM {
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u8 data[16384*header.prgROM16KBMultiplier-32];
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OfficialHeaderUnion officialHeaderUnion;
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u16 nmi;
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u16 entryPoint;
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u16 externalIRQ;
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};
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PRGROM prgROM @ sizeof(header);
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u8 chrROM[8192*header.chrROM8KBMultiplier] @ sizeof(header)+sizeof(prgROM); |