Module hash 

CRC32C hashing for component validation. CRC32C hashing for component validation.

Minecraft uses CRC32C (Castagnoli) checksums to validate component data in serverbound packets. This module provides a hasher that matches Minecraft’s HashOps implementation exactly.

Type Tags

Minecraft prefixes each value with a type tag byte before hashing:

• Primitives: TAG_BYTE, TAG_SHORT, TAG_INT, TAG_LONG, TAG_FLOAT, TAG_DOUBLE
• Boolean: TAG_BOOLEAN followed by 0x00 or 0x01
• String: TAG_STRING followed by length (i32 BE) and UTF-8 bytes
• Collections use start/end markers: TAG_MAP_START/END, TAG_LIST_START/END

All numeric values are little-endian (matching Guava’s Hasher).

Structs

ComponentHasher

A CRC32C hasher for component values.

HashEntry

A hash entry for map sorting.

Enums

HashTag

Type tags matching Minecraft’s HashOps implementation.

Traits

HashComponent

Trait for types that can be hashed for component validation.

Functions

sort_map_entries

Sorts map entries according to Minecraft’s ordering: First by key hash, then by value hash (both as padded longs).