34 lines
1.5 KiB
TypeScript
Executable file
34 lines
1.5 KiB
TypeScript
Executable file
import ByteBuffer from "./ByteBuffer";
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/**
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* This class provides encoding and decoding methods for writing and reading
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* ZigZag-encoded LEB128-64b9B-variant (Little Endian Base 128) values to/from a
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* {@link ByteBuffer}. LEB128's variable length encoding provides for using a
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* smaller nuber of bytes for smaller values, and the use of ZigZag encoding
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* allows small (closer to zero) negative values to use fewer bytes. Details
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* on both LEB128 and ZigZag can be readily found elsewhere.
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*
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* The LEB128-64b9B-variant encoding used here diverges from the "original"
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* LEB128 as it extends to 64 bit values: In the original LEB128, a 64 bit
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* value can take up to 10 bytes in the stream, where this variant's encoding
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* of a 64 bit values will max out at 9 bytes.
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*
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* As such, this encoder/decoder should NOT be used for encoding or decoding
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* "standard" LEB128 formats (e.g. Google Protocol Buffers).
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*/
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declare class ZigZagEncoding {
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/**
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* Writes a long value to the given buffer in LEB128 ZigZag encoded format
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* (negative numbers not supported)
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* @param buffer the buffer to write to
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* @param value the value to write to the buffer
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*/
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static encode(buffer: ByteBuffer, value: number): void;
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/**
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* Read an LEB128-64b9B ZigZag encoded long value from the given buffer
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* (negative numbers not supported)
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* @param buffer the buffer to read from
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* @return the value read from the buffer
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*/
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static decode(buffer: ByteBuffer): number;
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}
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export default ZigZagEncoding;
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