48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
package ormfield
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import (
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"encoding/binary"
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io "io"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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// Int32Codec encodes 32-bit integers as big-endian unsigned 32-bit integers
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// by adding the maximum value of int32 (2147583647) + 1 before encoding so
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// that these values can be used for ordered iteration.
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type Int32Codec struct{}
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var int32Codec = Int32Codec{}
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const int32Max = 2147483647
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const int32Offset = int32Max + 1
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func (i Int32Codec) Decode(r Reader) (protoreflect.Value, error) {
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var x uint32
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err := binary.Read(r, binary.BigEndian, &x)
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y := int64(x) - int32Offset
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return protoreflect.ValueOfInt32(int32(y)), err
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}
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func (i Int32Codec) Encode(value protoreflect.Value, w io.Writer) error {
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x := value.Int()
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x += int32Offset
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return binary.Write(w, binary.BigEndian, uint32(x))
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}
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func (i Int32Codec) Compare(v1, v2 protoreflect.Value) int {
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return compareInt(v1, v2)
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}
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func (i Int32Codec) IsOrdered() bool {
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return true
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}
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func (i Int32Codec) FixedBufferSize() int {
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return 4
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}
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func (i Int32Codec) ComputeBufferSize(protoreflect.Value) (int, error) {
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return i.FixedBufferSize(), nil
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}
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