| 1 | use crate::encoding::varint::{Signed, SignedVarInt, VarInt}; |
| 2 | |
| 3 | impl Write for Vec<u8> { |
| 4 | fn write_all(&mut self, buf: &[u8]) { |
| 5 | self.extend_from_slice(buf) |
| 6 | } |
| 7 | |
| 8 | fn write_u8(&mut self, value: u8) { |
| 9 | self.push(value) |
| 10 | } |
| 11 | } |
| 12 | |
| 13 | pub trait Write: Sized { |
| 14 | fn write_all(&mut self, buf: &[u8]); |
| 15 | |
| 16 | fn write_u8(&mut self, value: u8) { |
| 17 | self.write_all(&[value]) |
| 18 | } |
| 19 | |
| 20 | /// Write an unsigned integer (16bit) |
| 21 | fn write_u16(&mut self, num: u16) { |
| 22 | self.write_all(&[num as u8, (num >> 8) as u8]) |
| 23 | } |
| 24 | |
| 25 | /// Write an unsigned integer (32bit) |
| 26 | fn write_u32(&mut self, num: u32) { |
| 27 | self.write_all(&[ |
| 28 | num as u8, |
| 29 | (num >> 8) as u8, |
| 30 | (num >> 16) as u8, |
| 31 | (num >> 24) as u8, |
| 32 | ]) |
| 33 | } |
| 34 | |
| 35 | /// Write an unsigned integer (32bit) in big endian order (most significant byte first) |
| 36 | fn write_u32_be(&mut self, num: u32) { |
| 37 | self.write_all(&[ |
| 38 | (num >> 24) as u8, |
| 39 | (num >> 16) as u8, |
| 40 | (num >> 8) as u8, |
| 41 | num as u8, |
| 42 | ]) |
| 43 | } |
| 44 | |
| 45 | /// Write a variable length integer or unsigned integer. |
| 46 | /// |
| 47 | /// We don't use zig-zag encoding because we want to keep the option open |
| 48 | /// to use the same function for BigInt and 53bit integers. |
| 49 | /// |
| 50 | /// We use the 7th bit instead for signaling that this is a negative number. |
| 51 | #[inline] |
| 52 | fn write_var<T: VarInt>(&mut self, num: T) { |
| 53 | num.write(self) |
| 54 | } |
| 55 | |
| 56 | /// Write a variable length integer or unsigned integer. |
| 57 | /// |
| 58 | /// We don't use zig-zag encoding because we want to keep the option open |
| 59 | /// to use the same function for BigInt and 53bit integers. |
| 60 | /// |
| 61 | /// We use the 7th bit instead for signaling that this is a negative number. |
| 62 | #[inline] |
| 63 | fn write_var_signed<T: SignedVarInt>(&mut self, num: &Signed<T>) { |
| 64 | T::write_signed(num, self) |
| 65 | } |
| 66 | |
| 67 | /// Write variable length buffer (binary content). |
| 68 | fn write_buf<B: AsRef<[u8]>>(&mut self, buf: B) { |
| 69 | let buf = buf.as_ref(); |
| 70 | self.write_var(buf.len()); |
| 71 | self.write_all(buf) |
| 72 | } |
| 73 | |
| 74 | /// Write variable-length utf8 string |
| 75 | #[inline] |
| 76 | fn write_string(&mut self, str: &str) { |
| 77 | self.write_buf(str) |
| 78 | } |
| 79 | |
| 80 | /// Write floating point number in 4 bytes |
| 81 | #[inline] |
| 82 | fn write_f32(&mut self, num: f32) { |
| 83 | self.write_all(&num.to_be_bytes()) |
| 84 | } |
| 85 | |
| 86 | /// Write floating point number in 8 bytes |
| 87 | #[inline] |
| 88 | fn write_f64(&mut self, num: f64) { |
| 89 | self.write_all(&num.to_be_bytes()) |
| 90 | } |
| 91 | |
| 92 | /// Write BigInt in 8 bytes in big endian order. |
| 93 | #[inline] |
| 94 | fn write_i64(&mut self, num: i64) { |
| 95 | self.write_all(&num.to_be_bytes()) |
| 96 | } |
| 97 | |
| 98 | /// Write BigUInt in 8 bytes in big endian order. |
| 99 | #[inline] |
| 100 | fn write_u64(&mut self, num: u64) { |
| 101 | self.write_all(&num.to_be_bytes()) |
| 102 | } |
| 103 | } |
| 104 | |
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