Initial QSfera import

Server/vendor/github.com/shamaton/msgpack/v2/ext/decode.go

@@ -0,0 +1,61 @@
+package ext
+
+import (
+	"reflect"
+
+	"github.com/shamaton/msgpack/v2/def"
+)
+
+// Decoder defines an interface for decoding values from bytes.
+// It provides methods to get the decoder type, check if the data matches the type,
+// and convert the data into a Go value.
+type Decoder interface {
+	// Code returns the unique code representing the decoder type.
+	Code() int8
+
+	// IsType checks if the data at the given offset matches the expected type.
+	// Returns true if the type matches, false otherwise.
+	IsType(offset int, d *[]byte) bool
+
+	// AsValue decodes the data at the given offset into a Go value of the specified kind.
+	// Returns the decoded value, the new offset, and an error if decoding fails.
+	AsValue(offset int, k reflect.Kind, d *[]byte) (interface{}, int, error)
+}
+
+// DecoderCommon provides common utility methods for decoding data from bytes.
+type DecoderCommon struct {
+}
+
+// ReadSize1 reads a single byte from the given index in the byte slice.
+// Returns the byte and the new index after reading.
+func (cd *DecoderCommon) ReadSize1(index int, d *[]byte) (byte, int) {
+	rb := def.Byte1
+	return (*d)[index], index + rb
+}
+
+// ReadSize2 reads two bytes from the given index in the byte slice.
+// Returns the bytes as a slice and the new index after reading.
+func (cd *DecoderCommon) ReadSize2(index int, d *[]byte) ([]byte, int) {
+	rb := def.Byte2
+	return (*d)[index : index+rb], index + rb
+}
+
+// ReadSize4 reads four bytes from the given index in the byte slice.
+// Returns the bytes as a slice and the new index after reading.
+func (cd *DecoderCommon) ReadSize4(index int, d *[]byte) ([]byte, int) {
+	rb := def.Byte4
+	return (*d)[index : index+rb], index + rb
+}
+
+// ReadSize8 reads eight bytes from the given index in the byte slice.
+// Returns the bytes as a slice and the new index after reading.
+func (cd *DecoderCommon) ReadSize8(index int, d *[]byte) ([]byte, int) {
+	rb := def.Byte8
+	return (*d)[index : index+rb], index + rb
+}
+
+// ReadSizeN reads a specified number of bytes (n) from the given index in the byte slice.
+// Returns the bytes as a slice and the new index after reading.
+func (cd *DecoderCommon) ReadSizeN(index, n int, d *[]byte) ([]byte, int) {
+	return (*d)[index : index+n], index + n
+}