-
Notifications
You must be signed in to change notification settings - Fork 112
/
long.go
170 lines (142 loc) · 4.69 KB
/
long.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
* 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"
"io"
)
import (
perrors "github.com/pkg/errors"
)
/////////////////////////////////////////
// Int64
/////////////////////////////////////////
// # 64-bit signed long integer
// ::= 'L' b7 b6 b5 b4 b3 b2 b1 b0
// ::= [xd8-xef] # -x08 to x0f
// ::= [xf0-xff] b0 # -x800 to x7ff
// ::= [x38-x3f] b1 b0 # -x40000 to x3ffff
// ::= x59 b3 b2 b1 b0 # 32-bit integer cast to long
func encInt64(b []byte, v int64) []byte {
if int64(LONG_DIRECT_MIN) <= v && v <= int64(LONG_DIRECT_MAX) {
return encByte(b, byte(v+int64(BC_LONG_ZERO)))
} else if int64(LONG_BYTE_MIN) <= v && v <= int64(LONG_BYTE_MAX) {
return encByte(b, byte(int64(BC_LONG_BYTE_ZERO)+(v>>8)), byte(v))
} else if int64(LONG_SHORT_MIN) <= v && v <= int64(LONG_SHORT_MAX) {
return encByte(b, byte(int64(BC_LONG_SHORT_ZERO)+(v>>16)), byte(v>>8), byte(v))
} else if -0x80000000 <= v && v <= 0x7fffffff {
return encByte(b, BC_LONG_INT, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
}
return encByte(b, 'L', byte(v>>56), byte(v>>48), byte(v>>40), byte(v>>32), byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
}
/////////////////////////////////////////
// Int64
/////////////////////////////////////////
// # 64-bit signed long integer
// ::= 'L' b7 b6 b5 b4 b3 b2 b1 b0
// ::= [xd8-xef] # -x08 to x0f
// ::= [xf0-xff] b0 # -x800 to x7ff
// ::= [x38-x3f] b1 b0 # -x40000 to x3ffff
// ::= x59 b3 b2 b1 b0 # 32-bit integer cast to long
func (d *Decoder) decInt64(flag int32) (int64, error) {
var (
err error
tag byte
buf [8]byte
)
if flag != TAG_READ {
tag = byte(flag)
} else {
tag, _ = d.ReadByte()
}
switch {
case tag == BC_NULL:
return int64(0), nil
case tag == BC_FALSE:
return int64(0), nil
case tag == BC_TRUE:
return int64(1), nil
// direct integer
case tag >= 0x80 && tag <= 0xbf:
return int64(tag - BC_INT_ZERO), nil
// byte int
case tag >= 0xc0 && tag <= 0xcf:
if _, err = io.ReadFull(d.reader, buf[:1]); err != nil {
return 0, perrors.WithStack(err)
}
return int64(tag-BC_INT_BYTE_ZERO)<<8 + int64(buf[0]), nil
// short int
case tag >= 0xd0 && tag <= 0xd7:
if _, err = io.ReadFull(d.reader, buf[:2]); err != nil {
return 0, perrors.WithStack(err)
}
return int64(tag-BC_INT_SHORT_ZERO)<<16 + int64(buf[0])<<8 + int64(buf[1]), nil
case tag == BC_DOUBLE_BYTE:
tag, _ = d.ReadByte()
return int64(tag), nil
case tag == BC_DOUBLE_SHORT:
if _, err = io.ReadFull(d.reader, buf[:2]); err != nil {
return 0, perrors.WithStack(err)
}
return int64(int(buf[0])<<8 + int(buf[1])), nil
case tag == BC_INT: // 'I'
i32, decErr := d.decInt32(TAG_READ)
return int64(i32), decErr
case tag == BC_LONG_INT:
var i32 int32
err = binary.Read(d.reader, binary.BigEndian, &i32)
return int64(i32), perrors.WithStack(err)
case tag >= 0xd8 && tag <= 0xef:
i8 := int8(tag - BC_LONG_ZERO)
return int64(i8), nil
case tag >= 0xf0 && tag <= 0xff:
buf := []byte{tag - BC_LONG_BYTE_ZERO, 0}
_, err = io.ReadFull(d.reader, buf[1:])
if err != nil {
return 0, perrors.WithStack(err)
}
u16 := binary.BigEndian.Uint16(buf)
i16 := int16(u16)
return int64(i16), nil
case tag >= 0x38 && tag <= 0x3f:
// Use int32 to represent int24.
buf := []byte{0, tag - BC_LONG_SHORT_ZERO, 0, 0}
if buf[1]&0x80 != 0 {
buf[0] = 0xff
}
_, err = io.ReadFull(d.reader, buf[2:])
if err != nil {
return 0, perrors.WithStack(err)
}
u32 := binary.BigEndian.Uint32(buf)
i32 := int32(u32)
return int64(i32), nil
case tag == BC_LONG:
var i64 int64
err = binary.Read(d.reader, binary.BigEndian, &i64)
return i64, perrors.WithStack(err)
case tag == BC_DOUBLE_ZERO:
return int64(0), nil
case tag == BC_DOUBLE_ONE:
return int64(1), nil
case tag == BC_DOUBLE_MILL:
i64, err := d.decInt32(TAG_READ)
return int64(i64), perrors.WithStack(err)
default:
return 0, perrors.Errorf("decInt64 long wrong tag:%#x", tag)
}
}