diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/nimpb/nimpb.nim | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/nimpb/nimpb.nim b/src/nimpb/nimpb.nim index 8156e64..02e70f1 100644 --- a/src/nimpb/nimpb.nim +++ b/src/nimpb/nimpb.nim @@ -160,16 +160,26 @@ proc writeVarint*(stream: ProtobufStream, n: uint64) = writeByte(stream, value.byte) proc zigzagEncode*(n: int32): uint32 = - {.emit:["result = ((NU32)n << 1) ^ (NU32)(n >> 31);"].} + let x = cast[uint32](n) + let a = cast[int32](x shl 1) + let b = -cast[int32](x shr 31) + result = uint32(a xor b) proc zigzagDecode*(n: uint32): int32 = - {.emit:["result = (NI32) ((n >> 1) ^ (~(n & 1) + 1));"].} + let a = int32(n shr 1) + let b = -int32(n and 1) + result = a xor b proc zigzagEncode*(n: int64): uint64 = - {.emit:["result = ((NU64)n << 1) ^ (NU64)(n >> 63);"].} + let x = cast[uint64](n) + let a = cast[int64](x shl 1) + let b = -cast[int64](x shr 63) + result = uint64(a xor b) proc zigzagDecode*(n: uint64): int64 = - {.emit:["result = (NI64) ((n >> 1) ^ (~(n & 1) + 1));"].} + let a = int64(n shr 1) + let b = -int64(n and 1) + result = a xor b template makeTag*(fieldNumber: int, wireType: WireType): Tag = ((fieldNumber shl 3).uint32 or wireType.uint32).Tag |