Format: Arc archive

Format: MajiroArc archive

Archive type for all Majiro files of a specific category. Uses the .arc extension.

File structure

Type	Value	Description
char[16]	"MajiroArcV1.000" "MajiroArcV2.000" "MajiroArcV3.000"	File Signature and Version
uint32	Count	Number of file entries in archive
uint32	NamesOffset	Absolute offset to file NamesBuffer
uint32	DataOffset	Absolute offset to file DataBuffer
Entry[NV]	Entries	File entries table
cstring[N]	NamesBuffer	File names buffer
byte[]	DataBuffer	File data buffer

arc.Version = (int)(arc.Signature[10] - '0');
uint N  = arc.Count;
uint NV = arc.Count + (arc.Version==1 ? 1 : 0);
uint namesSize = arc.DataOffset - arc.NamesOffset;

Entry table

Entry V1

Unlike higher versions, V1 contains arc.Count + 1 table entries, where arc.Entries[arc.Count].Offset is used exclusively to calculate arc.Entries[arc.Count - 1].Length.

For arc.Entries[arc.Count], Hash = 0 and Offset = file.Length.

Type	Value	Description
uint32	Hash	CRC-32 hash of file name
uint32	Offset	Absolute offset to file data

entry.Length = arc.Entries[i+1].Offset - entry.Offset;

Entry V2

Type	Value	Description
uint32	Hash	CRC-32 hash of file name
uint32	Offset	Absolute offset to file data
uint32	Length	Length of file data

Entry V3

Type	Value	Description
uint64	Hash	CRC-64¹ hash of file name
uint32	Offset	Absolute offset to file data
uint32	Length	Length of file data

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Names buffer

A null-terminated list of entry names. With each name starting immediately after the previous name's null terminator.

Data buffer

Data is store uncompressed and decrypted^{[citation needed]}, each file can be read by seeking to entry.Offset and reading entry.Length bytes.

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See also

• Method: CRC hash