(t Type, n uint64)
| 22 | } |
| 23 | |
| 24 | func (e *Encoder) encodeTypedUint(t Type, n uint64) error { |
| 25 | // Major type 0: an unsigned integer. The 5-bit additional information |
| 26 | // is either the integer itself (for additional information values 0 |
| 27 | // through 23) or the length of additional data. Additional |
| 28 | // information 24 means the value is represented in an additional |
| 29 | // uint8_t, 25 means a uint16_t, 26 means a uint32_t, and 27 means a |
| 30 | // uint64_t. For example, the integer 10 is denoted as the one byte |
| 31 | // 0b000_01010 (major type 0, additional information 10). The |
| 32 | // integer 500 would be 0b000_11001 (major type 0, additional |
| 33 | // information 25) followed by the two bytes 0x01f4, which is 500 in |
| 34 | // decimal. |
| 35 | // |
| 36 | // https://tools.ietf.org/html/rfc7049#section-2.1 |
| 37 | ai := byte(0) // "additional information" |
| 38 | nfollow := 0 // length of the following bytes |
| 39 | switch { |
| 40 | case n < 24: |
| 41 | ai = byte(n) |
| 42 | nfollow = 0 |
| 43 | case n < (1 << 8): |
| 44 | ai = 24 |
| 45 | nfollow = 1 |
| 46 | case n < (1 << 16): |
| 47 | ai = 25 |
| 48 | nfollow = 2 |
| 49 | case n < (1 << 32): |
| 50 | ai = 26 |
| 51 | nfollow = 4 |
| 52 | default: |
| 53 | ai = 27 |
| 54 | nfollow = 8 |
| 55 | } |
| 56 | |
| 57 | encoded := make([]byte, 1+nfollow) |
| 58 | encoded[0] = byte(t) | ai |
| 59 | for i := nfollow - 1; i >= 0; i-- { |
| 60 | encoded[i+1] = byte(n) |
| 61 | n >>= 8 |
| 62 | } |
| 63 | |
| 64 | if _, err := e.w.Write(encoded); err != nil { |
| 65 | return err |
| 66 | } |
| 67 | return nil |
| 68 | } |
| 69 | |
| 70 | func (e *Encoder) EncodeUint(n uint64) error { |
| 71 | return e.encodeTypedUint(TypePosInt, n) |
no test coverage detected