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std.leb128

7-bit varints (wasm, dwarf, protobuf); padded forms ok, >64 bits fails

LebError

Section titled “LebError”
pub LebError :: errors {
    buffer_too_small,
    truncated,
    overflow,
}
  • buffer_too_small: out too small; nothing written
  • truncated: the bytes end in the middle of a number
  • overflow: more than 64 bits

MAX_LEN

Section titled “MAX_LEN”
pub MAX_LEN :: 10usize

max bytes for a 64-bit value

Unsigned

Section titled “Unsigned”
pub Unsigned :: struct {
    value: u64,
    len: usize,
}

decoded value + bytes used

Signed

Section titled “Signed”
pub Signed :: struct {
    value: i64,
    len: usize,
}

len_u64

Section titled “len_u64”
pub len_u64 :: fn(v: u64) -> usize

encoded size of v

len_i64

Section titled “len_i64”
pub len_i64 :: fn(v: i64) -> usize

encoded size of v, signed

encode_u64

Section titled “encode_u64”
pub encode_u64 :: fn(out: []u8, v: u64) -> usize ! LebError

encode v into out; returns len_u64(v)

encode_i64

Section titled “encode_i64”
pub encode_i64 :: fn(out: []u8, v: i64) -> usize ! LebError

encode signed v into out; returns len_i64(v)

decode_u64

Section titled “decode_u64”
pub decode_u64 :: fn(bytes: []const u8) -> Unsigned ! LebError

decode from the start of bytes

decode_i64

Section titled “decode_i64”
pub decode_i64 :: fn(bytes: []const u8) -> Signed ! LebError

decode signed from the start of bytes