Function takeLeb128 [src]

Read a single LEB128 value as type T, or error.Overflow if the value cannot fit.

Prototype

pub fn takeLeb128(r: *Reader, comptime Result: type) TakeLeb128Error!Result

Parameters

r: *ReaderResult: type

Possible Errors

EndOfStream Error

Overflow

ReadFailed Error

See the Reader implementation for detailed diagnostics.

Example

 test takeLeb128 {
    var r: Reader = .fixed("\xc7\x9f\x7f\x80");
    try testing.expectEqual(-12345, try r.takeLeb128(i64));
    try testing.expectEqual(0x80, try r.peekByte());
    try testing.expectError(error.EndOfStream, r.takeLeb128(i64));
}

Source

  pub fn takeLeb128(r: *Reader, comptime Result: type) TakeLeb128Error!Result {
    const result_info = @typeInfo(Result).int;
    return std.math.cast(Result, try r.takeMultipleOf7Leb128(@Type(.{ .int = .{
        .signedness = result_info.signedness,
        .bits = std.mem.alignForwardAnyAlign(u16, result_info.bits, 7),
    } }))) orelse error.Overflow;
}  