source: code/Website/open-flash-chart/com/adobe/net/URIEncodingBitmap.as@ 7849

Last change on this file since 7849 was 7849, checked in by dennisw, 16 years ago
File size: 4.5 KB
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1/*
2 Adobe Systems Incorporated(r) Source Code License Agreement
3 Copyright(c) 2005 Adobe Systems Incorporated. All rights reserved.
4
5 Please read this Source Code License Agreement carefully before using
6 the source code.
7
8 Adobe Systems Incorporated grants to you a perpetual, worldwide, non-exclusive,
9 no-charge, royalty-free, irrevocable copyright license, to reproduce,
10 prepare derivative works of, publicly display, publicly perform, and
11 distribute this source code and such derivative works in source or
12 object code form without any attribution requirements.
13
14 The name "Adobe Systems Incorporated" must not be used to endorse or promote products
15 derived from the source code without prior written permission.
16
17 You agree to indemnify, hold harmless and defend Adobe Systems Incorporated from and
18 against any loss, damage, claims or lawsuits, including attorney's
19 fees that arise or result from your use or distribution of the source
20 code.
21
22 THIS SOURCE CODE IS PROVIDED "AS IS" AND "WITH ALL FAULTS", WITHOUT
23 ANY TECHNICAL SUPPORT OR ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
24 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ALSO, THERE IS NO WARRANTY OF
26 NON-INFRINGEMENT, TITLE OR QUIET ENJOYMENT. IN NO EVENT SHALL MACROMEDIA
27 OR ITS SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOURCE CODE, EVEN IF
33 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*/
35
36package com.adobe.net
37{
38 import flash.utils.ByteArray;
39
40 /**
41 * This class implements an efficient lookup table for URI
42 * character escaping. This class is only needed if you
43 * create a derived class of URI to handle custom URI
44 * syntax. This class is used internally by URI.
45 *
46 * @langversion ActionScript 3.0
47 * @playerversion Flash 9.0*
48 */
49 public class URIEncodingBitmap extends ByteArray
50 {
51 /**
52 * Constructor. Creates an encoding bitmap using the given
53 * string of characters as the set of characters that need
54 * to be URI escaped.
55 *
56 * @langversion ActionScript 3.0
57 * @playerversion Flash 9.0
58 */
59 public function URIEncodingBitmap(charsToEscape:String) : void
60 {
61 var i:int;
62 var data:ByteArray = new ByteArray();
63
64 // Initialize our 128 bits (16 bytes) to zero
65 for (i = 0; i < 16; i++)
66 this.writeByte(0);
67
68 data.writeUTFBytes(charsToEscape);
69 data.position = 0;
70
71 while (data.bytesAvailable)
72 {
73 var c:int = data.readByte();
74
75 if (c > 0x7f)
76 continue; // only escape low bytes
77
78 var enc:int;
79 this.position = (c >> 3);
80 enc = this.readByte();
81 enc |= 1 << (c & 0x7);
82 this.position = (c >> 3);
83 this.writeByte(enc);
84 }
85 }
86
87 /**
88 * Based on the data table contained in this object, check
89 * if the given character should be escaped.
90 *
91 * @param char the character to be escaped. Only the first
92 * character in the string is used. Any other characters
93 * are ignored.
94 *
95 * @return the integer value of the raw UTF8 character. For
96 * example, if '%' is given, the return value is 37 (0x25).
97 * If the character given does not need to be escaped, the
98 * return value is zero.
99 *
100 * @langversion ActionScript 3.0
101 * @playerversion Flash 9.0
102 */
103 public function ShouldEscape(char:String) : int
104 {
105 var data:ByteArray = new ByteArray();
106 var c:int, mask:int;
107
108 // write the character into a ByteArray so
109 // we can pull it out as a raw byte value.
110 data.writeUTFBytes(char);
111 data.position = 0;
112 c = data.readByte();
113
114 if (c & 0x80)
115 {
116 // don't escape high byte characters. It can make international
117 // URI's unreadable. We just want to escape characters that would
118 // make URI syntax ambiguous.
119 return 0;
120 }
121 else if ((c < 0x1f) || (c == 0x7f))
122 {
123 // control characters must be escaped.
124 return c;
125 }
126
127 this.position = (c >> 3);
128 mask = this.readByte();
129
130 if (mask & (1 << (c & 0x7)))
131 {
132 // we need to escape this, return the numeric value
133 // of the character
134 return c;
135 }
136 else
137 {
138 return 0;
139 }
140 }
141 }
142}
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