21 lines
2.7 KiB
C++
21 lines
2.7 KiB
C++
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// information taken from https://wiki.vg/NBT
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// This is an attempt at creating a uniform model for all NBT tags to allow for a uniform interface based on subclassing a single NBT tag super class.
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// NBT tags have a type (signed or unsigned?), optionally a name, optionally content type, optionally a size (signed), and content
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// Whether the type id byte is signed or not is unknown at this point. All other numbers are signed unless specified otherwise.
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// All tag types:
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// generic representation: Tag(Byte:tag_type, String:name, byte[]:content, Byte:content_type, int32:size)
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// end: Tag( 0, "", None, 0, 0) => used to determine the end of a compound tag, only the type gets stored
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// byte: Tag( 1, String:name, byte:content, 1, 1) => a single signed byte, size and content type not stored
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// int16: Tag( 2, String:name, int16:content, 2, 2) => big endian signed 16 bit integer, size and content type not stored
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// int32: Tag( 3, String:name, int32:content, 3, 4) => big endian signed 32 bit integer, size and content type not stored
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// int64: Tag( 4, String:name, int64:content, 4, 8) => big endian signed 64 bit integer, size and content type not stored
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// float32: Tag( 5, String:name, float32:content,5, 4) => big endian 32 bit floating point number, size and content type not stored
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// float64: Tag( 6, String:name, float64:content,6, 8) => big endian 64 bit floating point number, size and content type not stored
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// byte[]: Tag( 7, String:name, byte[]:content, 1, int32:size) => content stored prefixed with size, content type not stored
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// String: Tag( 8, String:name, byte[]:content, 8, uint16:size) => Java style modified UTF-8 string, size is unique bc it's 16 bit and unsigned, content stored prefixed with size, content type not stored
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// Tag[] (list): Tag( 9, String:name, Tag[]:content, byte:content_type, int32:size) => list of nameless tags of the same type prefixed by (in order) content type and size, no closer specification as to what namelessness entails
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// Tag[] (compound): Tag(10, String:name, Tag[]:content, None, int32:size) => list of tags, last tag is always an end tag, size and content type not stored
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// int32[]: Tag(11, String:name, int32[]:content,3, int32:size) => list of 32 bit signed integers prefixed with its size, content type not stored, endianness unknown at this point
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// int64[]: Tag(12, String:name, int64[]:content,4, int32:size) => list of 64 bit signed integers prefixed with its size, content type not stored, endianness unknown at this point
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