Crate const_varint 

Note: This crate is renamed to varing.

const-varint

Protobuf’s varint encoding/decoding with full const context operations supports. (This project is renamed to varing)

Installation

[dependencies]
const-varint = "0.4"

• For u1, u2, u3, .., u127

  const-varint = { version = "0.4", features = "arbitrary-int" }

• For ruint::Uint<BITS, LBITS> support (not compatible in const context)

  const-varint = { version = "0.4", features = ["ruint"] }

• For primitive-types support (not compatible in const context)

  const-varint = { version = "0.4", features = ["primitive-types"] }

• For ethereum-types support (not compatible in const context)

  const-varint = { version = "0.4", features = ["ethereum-types"] }

License

const-varint is under the terms of both the MIT license and the Apache License (Version 2.0).

See LICENSE-APACHE, LICENSE-MIT for details.

Copyright (c) 2025 Al Liu.

Modules

arbitrary_intarbitrary-int

LEB128 encoding/decoding for u1, u2 .. u127

Structs

I8VarintBuffer

A buffer for storing LEB128 encoded i8 values.

I16VarintBuffer

A buffer for storing LEB128 encoded i16 values.

I32VarintBuffer

A buffer for storing LEB128 encoded i32 values.

I64VarintBuffer

A buffer for storing LEB128 encoded i64 values.

I128VarintBuffer

A buffer for storing LEB128 encoded i128 values.

U8VarintBuffer

A buffer for storing LEB128 encoded u8 values.

U16VarintBuffer

A buffer for storing LEB128 encoded u16 values.

U32VarintBuffer

A buffer for storing LEB128 encoded u32 values.

U64VarintBuffer

A buffer for storing LEB128 encoded u64 values.

U128VarintBuffer

A buffer for storing LEB128 encoded u128 values.

Enums

DecodeError

Decoding varint error.

EncodeError

Encode varint error

Traits

Varint

A trait for types that can be encoded as variable-length integers (varints).

Functions

consume_varint

Calculates the number of bytes occupied by a varint encoded value in the buffer.

decode_char

Decodes a char in LEB128 encoded format from the buffer.

decode_duration

Decodes a Duration in LEB128 encoded format from the buffer.

decode_i8_varint

Decodes an u8 in LEB128 encoded format from the buffer.

decode_i16_varint

Decodes an u16 in LEB128 encoded format from the buffer.

decode_i32_varint

Decodes an u32 in LEB128 encoded format from the buffer.

decode_i64_varint

Decodes an u64 in LEB128 encoded format from the buffer.

decode_i128_varint

Decodes an u128 in LEB128 encoded format from the buffer.

decode_u8_varint

Decodes an i8 in LEB128 encoded format from the buffer.

decode_u16_varint

Decodes an i16 in LEB128 encoded format from the buffer.

decode_u32_varint

Decodes an i32 in LEB128 encoded format from the buffer.

decode_u64_varint

Decodes an i64 in LEB128 encoded format from the buffer.

decode_u128_varint

Decodes an i128 in LEB128 encoded format from the buffer.

encode_char

Encodes a char value into LEB128 variable length format, and writes it to the buffer.

encode_char_to

Encodes a char value into LEB128 variable length format, and writes it to the buffer.

encode_duration

Encodes a Duration value into LEB128 variable length format, and writes it to the buffer.

encode_duration_to

Encodes a Duration value into LEB128 variable length format, and writes it to the buffer.

encode_i8_varint

Encodes an i8 value into LEB128 variable length format, and writes it to the buffer.

encode_i8_varint_to

Encodes an i8 value into LEB128 variable length format, and writes it to the buffer.

encode_i16_varint

Encodes an i16 value into LEB128 variable length format, and writes it to the buffer.

encode_i16_varint_to

Encodes an i16 value into LEB128 variable length format, and writes it to the buffer.

encode_i32_varint

Encodes an i32 value into LEB128 variable length format, and writes it to the buffer.

encode_i32_varint_to

Encodes an i32 value into LEB128 variable length format, and writes it to the buffer.

encode_i64_varint

Encodes an i64 value into LEB128 variable length format, and writes it to the buffer.

encode_i64_varint_to

Encodes an i64 value into LEB128 variable length format, and writes it to the buffer.

encode_i128_varint

Encodes an i128 value into LEB128 variable length format, and writes it to the buffer.

encode_i128_varint_to

Encodes an i128 value into LEB128 variable length format, and writes it to the buffer.

encode_u8_varint

Encodes an u8 value into LEB128 variable length format, and writes it to the buffer.

encode_u8_varint_to

Encodes an u8 value into LEB128 variable length format, and writes it to the buffer.

encode_u16_varint

Encodes an u16 value into LEB128 variable length format, and writes it to the buffer.

encode_u16_varint_to

Encodes an u16 value into LEB128 variable length format, and writes it to the buffer.

encode_u32_varint

Encodes an u32 value into LEB128 variable length format, and writes it to the buffer.

encode_u32_varint_to

Encodes an u32 value into LEB128 variable length format, and writes it to the buffer.

encode_u64_varint

Encodes an u64 value into LEB128 variable length format, and writes it to the buffer.

encode_u64_varint_to

Encodes an u64 value into LEB128 variable length format, and writes it to the buffer.

encode_u128_varint

Encodes an u128 value into LEB128 variable length format, and writes it to the buffer.

encode_u128_varint_to

Encodes an u128 value into LEB128 variable length format, and writes it to the buffer.

encoded_char_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range char::ENCODED_LEN_RANGE.

encoded_duration_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range Duration::ENCODED_LEN_RANGE.

encoded_i8_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range of i8::ENCODED_LEN_RANGE.

encoded_i16_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range of i16::ENCODED_LEN_RANGE.

encoded_i32_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range of i32::ENCODED_LEN_RANGE.

encoded_i64_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range i64::ENCODED_LEN_RANGE.

encoded_i128_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range i128::ENCODED_LEN_RANGE.

encoded_u8_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range of u8::ENCODED_LEN_RANGE.

encoded_u16_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range of u16::ENCODED_LEN_RANGE.

encoded_u32_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range of u32::ENCODED_LEN_RANGE.

encoded_u64_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range u64::ENCODED_LEN_RANGE.

encoded_u128_varint_len

Returns the encoded length of the value in LEB128 variable length format. The returned value will be in range u128::ENCODED_LEN_RANGE.

Type Aliases

CharBuffer

A buffer for storing LEB128 encoded char value.

DurationBuffer

A buffer for storing LEB128 encoded Duration value.