| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package hessian |
| |
| import ( |
| "encoding/binary" |
| "math" |
| ) |
| |
| import ( |
| perrors "github.com/pkg/errors" |
| ) |
| |
| ///////////////////////////////////////// |
| // Double |
| ///////////////////////////////////////// |
| |
| // # 64-bit IEEE double |
| // ::= 'D' b7 b6 b5 b4 b3 b2 b1 b0 |
| // ::= x5b # 0.0 |
| // ::= x5c # 1.0 |
| // ::= x5d b0 # byte cast to double (-128.0 to 127.0) |
| // ::= x5e b1 b0 # short cast to double |
| // ::= x5f b3 b2 b1 b0 # 32-bit float cast to double |
| func encFloat(b []byte, v float64) []byte { |
| fv := float64(int64(v)) |
| if fv == v { |
| iv := int64(v) |
| switch iv { |
| case 0: |
| return encByte(b, BC_DOUBLE_ZERO) |
| case 1: |
| return encByte(b, BC_DOUBLE_ONE) |
| } |
| if iv >= -0x80 && iv < 0x80 { |
| return encByte(b, BC_DOUBLE_BYTE, byte(iv)) |
| } else if iv >= -0x8000 && iv < 0x8000 { |
| return encByte(b, BC_DOUBLE_SHORT, byte(iv>>8), byte(iv)) |
| } |
| |
| goto END |
| } |
| |
| END: |
| bits := math.Float64bits(v) |
| return encByte(b, BC_DOUBLE, byte(bits>>56), byte(bits>>48), byte(bits>>40), |
| byte(bits>>32), byte(bits>>24), byte(bits>>16), byte(bits>>8), byte(bits)) |
| } |
| |
| ///////////////////////////////////////// |
| // Double |
| ///////////////////////////////////////// |
| |
| // # 64-bit IEEE double |
| // ::= 'D' b7 b6 b5 b4 b3 b2 b1 b0 |
| // ::= x5b # 0.0 |
| // ::= x5c # 1.0 |
| // ::= x5d b0 # byte cast to double (-128.0 to 127.0) |
| // ::= x5e b1 b0 # short cast to double |
| // ::= x5f b3 b2 b1 b0 # 32-bit float cast to double |
| func (d *Decoder) decDouble(flag int32) (interface{}, error) { |
| var ( |
| err error |
| tag byte |
| ) |
| |
| if flag != TAG_READ { |
| tag = byte(flag) |
| } else { |
| tag, _ = d.readByte() |
| } |
| switch tag { |
| case BC_LONG_INT: |
| return d.decInt32(TAG_READ) |
| |
| case BC_DOUBLE_ZERO: |
| return float64(0), nil |
| |
| case BC_DOUBLE_ONE: |
| return float64(1), nil |
| |
| case BC_DOUBLE_BYTE: |
| var i8 int8 |
| err = binary.Read(d.reader, binary.BigEndian, &i8) |
| return float64(i8), perrors.WithStack(err) |
| |
| case BC_DOUBLE_SHORT: |
| var i16 int16 |
| err = binary.Read(d.reader, binary.BigEndian, &i16) |
| return float64(i16), perrors.WithStack(err) |
| |
| case BC_DOUBLE_MILL: |
| var i32 int32 |
| err = binary.Read(d.reader, binary.BigEndian, &i32) |
| return float64(i32) / 1000, perrors.WithStack(err) |
| |
| case BC_DOUBLE: |
| var f64 float64 |
| err = binary.Read(d.reader, binary.BigEndian, &f64) |
| return f64, perrors.WithStack(err) |
| } |
| |
| return nil, perrors.Errorf("decDouble parse double wrong tag:%d-%#x", int(tag), tag) |
| } |