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-rw-r--r--js/binaryXHR.js521
1 files changed, 264 insertions, 257 deletions
diff --git a/js/binaryXHR.js b/js/binaryXHR.js
index d82c808..63186b3 100644
--- a/js/binaryXHR.js
+++ b/js/binaryXHR.js
@@ -1,257 +1,264 @@
1 1// jshint browser:true
2/* 2/*
3 * BinaryFile over XMLHttpRequest 3 * BinaryFile over XMLHttpRequest
4 * Part of the javascriptRRD package 4 * Part of the javascriptRRD package
5 * Copyright (c) 2009 Frank Wuerthwein, fkw@ucsd.edu 5 * Copyright (c) 2009 Frank Wuerthwein, fkw@ucsd.edu
6 * MIT License [http://www.opensource.org/licenses/mit-license.php] 6 * MIT License [http://www.opensource.org/licenses/mit-license.php]
7 * 7 *
8 * Original repository: http://javascriptrrd.sourceforge.net/ 8 * Original repository: http://javascriptrrd.sourceforge.net/
9 * 9 *
10 * Based on: 10 * Based on:
11 * Binary Ajax 0.1.5 11 * Binary Ajax 0.1.5
12 * Copyright (c) 2008 Jacob Seidelin, cupboy@gmail.com, http://blog.nihilogic.dk/ 12 * Copyright (c) 2008 Jacob Seidelin, cupboy@gmail.com, http://blog.nihilogic.dk/
13 * MIT License [http://www.opensource.org/licenses/mit-license.php] 13 * MIT License [http://www.opensource.org/licenses/mit-license.php]
14 */ 14 */
15 15
16// ============================================================ 16// ============================================================
17// Exception class 17// Exception class
18function InvalidBinaryFile(msg) { 18function InvalidBinaryFile(msg) {
19 this.message=msg; 19 "use strict";
20 this.name="Invalid BinaryFile"; 20 this.message = msg;
21} 21 this.name = "Invalid BinaryFile";
22 22}
23// pretty print 23
24InvalidBinaryFile.prototype.toString = function() { 24// pretty print
25 return this.name + ': "' + this.message + '"'; 25InvalidBinaryFile.prototype.toString = function() {
26} 26 "use strict";
27 27 return this.name + ': "' + this.message + '"';
28// ===================================================================== 28};
29// BinaryFile class 29
30// Allows access to element inside a binary stream 30// =====================================================================
31function BinaryFile(strData, iDataOffset, iDataLength) { 31// BinaryFile class
32 var data = strData; 32// Allows access to element inside a binary stream
33 var dataOffset = iDataOffset || 0; 33function BinaryFile(strData, iDataOffset, iDataLength) {
34 var dataLength = 0; 34 "use strict";
35 // added 35 var data = strData;
36 var doubleMantExpHi=Math.pow(2,-28); 36 var dataOffset = iDataOffset || 0;
37 var doubleMantExpLo=Math.pow(2,-52); 37 var dataLength = 0;
38 var doubleMantExpFast=Math.pow(2,-20); 38 // added
39 39 var doubleMantExpHi=Math.pow(2,-28);
40 var switch_endian = false; 40 var doubleMantExpLo=Math.pow(2,-52);
41 41 var doubleMantExpFast=Math.pow(2,-20);
42 this.getRawData = function() { 42
43 return data; 43 var switch_endian = false;
44 } 44
45 45 this.getRawData = function() {
46 if (typeof strData == "string") { 46 return data;
47 dataLength = iDataLength || data.length; 47 };
48 48
49 this.getByteAt = function(iOffset) { 49 if (typeof strData === "string") {
50 return data.charCodeAt(iOffset + dataOffset) & 0xFF; 50 dataLength = iDataLength || data.length;
51 } 51
52 } else if (typeof strData == "unknown") { 52 this.getByteAt = function(iOffset) {
53 dataLength = iDataLength || IEBinary_getLength(data); 53 return data.charCodeAt(iOffset + dataOffset) & 0xFF;
54 54 };
55 this.getByteAt = function(iOffset) { 55 } else if (typeof strData === "unknown") {
56 return IEBinary_getByteAt(data, iOffset + dataOffset); 56 // Correct. "unknown" as type. MS JScript 8 added this.
57 } 57 dataLength = iDataLength || IEBinary_getLength(data);
58 } else { 58
59 throw new InvalidBinaryFile("Unsupported type " + (typeof strData)); 59 this.getByteAt = function(iOffset) {
60 } 60 return IEBinary_getByteAt(data, iOffset + dataOffset);
61 61 };
62 this.getEndianByteAt = function(iOffset,width,delta) { 62 } else {
63 if (this.switch_endian) 63 throw new InvalidBinaryFile("Unsupported type " + (typeof strData));
64 return this.getByteAt(iOffset+width-delta-1); 64 }
65 else 65
66 return this.getByteAt(iOffset+delta); 66 this.getEndianByteAt = function(iOffset,width,delta) {
67 } 67 if (this.switch_endian)
68 68 return this.getByteAt(iOffset+width-delta-1);
69 this.getLength = function() { 69 else
70 return dataLength; 70 return this.getByteAt(iOffset+delta);
71 } 71 };
72 72
73 this.getSByteAt = function(iOffset) { 73 this.getLength = function() {
74 var iByte = this.getByteAt(iOffset); 74 return dataLength;
75 if (iByte > 127) 75 };
76 return iByte - 256; 76
77 else 77 this.getSByteAt = function(iOffset) {
78 return iByte; 78 var iByte = this.getByteAt(iOffset);
79 } 79 if (iByte > 127)
80 80 return iByte - 256;
81 this.getShortAt = function(iOffset) { 81 else
82 var iShort = (this.getEndianByteAt(iOffset,2,1) << 8) + this.getEndianByteAt(iOffset,2,0) 82 return iByte;
83 if (iShort < 0) iShort += 65536; 83 };
84 return iShort; 84
85 } 85 this.getShortAt = function(iOffset) {
86 this.getSShortAt = function(iOffset) { 86 var iShort = (this.getEndianByteAt(iOffset,2,1) << 8) + this.getEndianByteAt(iOffset,2,0);
87 var iUShort = this.getShortAt(iOffset); 87 if (iShort < 0) iShort += 65536;
88 if (iUShort > 32767) 88 return iShort;
89 return iUShort - 65536; 89 };
90 else 90 this.getSShortAt = function(iOffset) {
91 return iUShort; 91 var iUShort = this.getShortAt(iOffset);
92 } 92 if (iUShort > 32767)
93 this.getLongAt = function(iOffset) { 93 return iUShort - 65536;
94 var iByte1 = this.getEndianByteAt(iOffset,4,0), 94 else
95 iByte2 = this.getEndianByteAt(iOffset,4,1), 95 return iUShort;
96 iByte3 = this.getEndianByteAt(iOffset,4,2), 96 };
97 iByte4 = this.getEndianByteAt(iOffset,4,3); 97 this.getLongAt = function(iOffset) {
98 98 var iByte1 = this.getEndianByteAt(iOffset,4,0),
99 var iLong = (((((iByte4 << 8) + iByte3) << 8) + iByte2) << 8) + iByte1; 99 iByte2 = this.getEndianByteAt(iOffset,4,1),
100 if (iLong < 0) iLong += 4294967296; 100 iByte3 = this.getEndianByteAt(iOffset,4,2),
101 return iLong; 101 iByte4 = this.getEndianByteAt(iOffset,4,3);
102 } 102
103 this.getSLongAt = function(iOffset) { 103 var iLong = (((((iByte4 << 8) + iByte3) << 8) + iByte2) << 8) + iByte1;
104 var iULong = this.getLongAt(iOffset); 104 if (iLong < 0) iLong += 4294967296;
105 if (iULong > 2147483647) 105 return iLong;
106 return iULong - 4294967296; 106 };
107 else 107 this.getSLongAt = function(iOffset) {
108 return iULong; 108 var iULong = this.getLongAt(iOffset);
109 } 109 if (iULong > 2147483647)
110 this.getStringAt = function(iOffset, iLength) { 110 return iULong - 4294967296;
111 var aStr = []; 111 else
112 for (var i=iOffset,j=0;i<iOffset+iLength;i++,j++) { 112 return iULong;
113 aStr[j] = String.fromCharCode(this.getByteAt(i)); 113 };
114 } 114 this.getStringAt = function(iOffset, iLength) {
115 return aStr.join(""); 115 var aStr = [];
116 } 116 for (var i=iOffset,j=0;i<iOffset+iLength;i++,j++) {
117 117 aStr[j] = String.fromCharCode(this.getByteAt(i));
118 // Added 118 }
119 this.getCStringAt = function(iOffset, iMaxLength) { 119 return aStr.join("");
120 var aStr = []; 120 };
121 for (var i=iOffset,j=0;(i<iOffset+iMaxLength) && (this.getByteAt(i)>0);i++,j++) { 121
122 aStr[j] = String.fromCharCode(this.getByteAt(i)); 122 // Added
123 } 123 this.getCStringAt = function(iOffset, iMaxLength) {
124 return aStr.join(""); 124 var aStr = [];
125 } 125 for (var i=iOffset,j=0;(i<iOffset+iMaxLength) && (this.getByteAt(i)>0);i++,j++) {
126 126 aStr[j] = String.fromCharCode(this.getByteAt(i));
127 // Added 127 }
128 this.getDoubleAt = function(iOffset) { 128 return aStr.join("");
129 var iByte1 = this.getEndianByteAt(iOffset,8,0), 129 };
130 iByte2 = this.getEndianByteAt(iOffset,8,1), 130
131 iByte3 = this.getEndianByteAt(iOffset,8,2), 131 // Added
132 iByte4 = this.getEndianByteAt(iOffset,8,3), 132 this.getDoubleAt = function(iOffset) {
133 iByte5 = this.getEndianByteAt(iOffset,8,4), 133 var iByte1 = this.getEndianByteAt(iOffset,8,0),
134 iByte6 = this.getEndianByteAt(iOffset,8,5), 134 iByte2 = this.getEndianByteAt(iOffset,8,1),
135 iByte7 = this.getEndianByteAt(iOffset,8,6), 135 iByte3 = this.getEndianByteAt(iOffset,8,2),
136 iByte8 = this.getEndianByteAt(iOffset,8,7); 136 iByte4 = this.getEndianByteAt(iOffset,8,3),
137 var iSign=iByte8 >> 7; 137 iByte5 = this.getEndianByteAt(iOffset,8,4),
138 var iExpRaw=((iByte8 & 0x7F)<< 4) + (iByte7 >> 4); 138 iByte6 = this.getEndianByteAt(iOffset,8,5),
139 var iMantHi=((((((iByte7 & 0x0F) << 8) + iByte6) << 8) + iByte5) << 8) + iByte4; 139 iByte7 = this.getEndianByteAt(iOffset,8,6),
140 var iMantLo=((((iByte3) << 8) + iByte2) << 8) + iByte1; 140 iByte8 = this.getEndianByteAt(iOffset,8,7);
141 141 var iSign=iByte8 >> 7;
142 if (iExpRaw==0) return 0.0; 142 var iExpRaw=((iByte8 & 0x7F)<< 4) + (iByte7 >> 4);
143 if (iExpRaw==0x7ff) return undefined; 143 var iMantHi=((((((iByte7 & 0x0F) << 8) + iByte6) << 8) + iByte5) << 8) + iByte4;
144 144 var iMantLo=((((iByte3) << 8) + iByte2) << 8) + iByte1;
145 var iExp=(iExpRaw & 0x7FF)-1023; 145
146 146 if (iExpRaw === 0) return 0.0;
147 var dDouble = ((iSign==1)?-1:1)*Math.pow(2,iExp)*(1.0 + iMantLo*doubleMantExpLo + iMantHi*doubleMantExpHi); 147 if (iExpRaw === 0x7ff) return undefined;
148 return dDouble; 148
149 } 149 var iExp=(iExpRaw & 0x7FF)-1023;
150 // added 150
151 // Extracts only 4 bytes out of 8, loosing in precision (20 bit mantissa) 151 var dDouble = ((iSign==1)?-1:1)*Math.pow(2,iExp)*(1.0 + iMantLo*doubleMantExpLo + iMantHi*doubleMantExpHi);
152 this.getFastDoubleAt = function(iOffset) { 152 return dDouble;
153 var iByte5 = this.getEndianByteAt(iOffset,8,4), 153 };
154 iByte6 = this.getEndianByteAt(iOffset,8,5), 154 // added
155 iByte7 = this.getEndianByteAt(iOffset,8,6), 155 // Extracts only 4 bytes out of 8, loosing in precision (20 bit mantissa)
156 iByte8 = this.getEndianByteAt(iOffset,8,7); 156 this.getFastDoubleAt = function(iOffset) {
157 var iSign=iByte8 >> 7; 157 var iByte5 = this.getEndianByteAt(iOffset,8,4),
158 var iExpRaw=((iByte8 & 0x7F)<< 4) + (iByte7 >> 4); 158 iByte6 = this.getEndianByteAt(iOffset,8,5),
159 var iMant=((((iByte7 & 0x0F) << 8) + iByte6) << 8) + iByte5; 159 iByte7 = this.getEndianByteAt(iOffset,8,6),
160 160 iByte8 = this.getEndianByteAt(iOffset,8,7);
161 if (iExpRaw==0) return 0.0; 161 var iSign=iByte8 >> 7;
162 if (iExpRaw==0x7ff) return undefined; 162 var iExpRaw=((iByte8 & 0x7F)<< 4) + (iByte7 >> 4);
163 163 var iMant=((((iByte7 & 0x0F) << 8) + iByte6) << 8) + iByte5;
164 var iExp=(iExpRaw & 0x7FF)-1023; 164
165 165 if (iExpRaw === 0) return 0.0;
166 var dDouble = ((iSign==1)?-1:1)*Math.pow(2,iExp)*(1.0 + iMant*doubleMantExpFast); 166 if (iExpRaw === 0x7ff) return undefined;
167 return dDouble; 167
168 } 168 var iExp=(iExpRaw & 0x7FF)-1023;
169 169
170 this.getCharAt = function(iOffset) { 170 var dDouble = ((iSign === 1) ? -1 : 1);
171 return String.fromCharCode(this.getByteAt(iOffset)); 171 dDouble *= Math.pow(2,iExp) * (1.0 + iMant*doubleMantExpFast);
172 } 172 return dDouble;
173} 173 };
174 174
175 175 this.getCharAt = function(iOffset) {
176document.write( 176 return String.fromCharCode(this.getByteAt(iOffset));
177 "<script type='text/vbscript'>\r\n" 177 };
178 + "Function IEBinary_getByteAt(strBinary, iOffset)\r\n" 178}
179 + " IEBinary_getByteAt = AscB(MidB(strBinary,iOffset+1,1))\r\n" 179
180 + "End Function\r\n" 180
181 + "Function IEBinary_getLength(strBinary)\r\n" 181document.write(
182 + " IEBinary_getLength = LenB(strBinary)\r\n" 182 "<script type='text/vbscript'>\r\n"
183 + "End Function\r\n" 183 + "Function IEBinary_getByteAt(strBinary, iOffset)\r\n"
184 + "</script>\r\n" 184 + " IEBinary_getByteAt = AscB(MidB(strBinary,iOffset+1,1))\r\n"
185); 185 + "End Function\r\n"
186 186 + "Function IEBinary_getLength(strBinary)\r\n"
187 187 + " IEBinary_getLength = LenB(strBinary)\r\n"
188 188 + "End Function\r\n"
189// =============================================================== 189 + "</script>\r\n"
190// Load a binary file from the specified URL 190);
191// Will return an object of type BinaryFile 191
192function FetchBinaryURL(url) { 192
193 var request = new XMLHttpRequest(); 193
194 request.open("GET", url,false); 194// ===============================================================
195 try { 195// Load a binary file from the specified URL
196 request.overrideMimeType('text/plain; charset=x-user-defined'); 196// Will return an object of type BinaryFile
197 } catch (err) { 197function FetchBinaryURL(url) {
198 // ignore any error, just to make both FF and IE work 198 "use strict";
199 } 199 var request = new XMLHttpRequest();
200 request.send(null); 200 request.open("GET", url,false);
201 201 try {
202 var response=request.responseText; 202 request.overrideMimeType('text/plain; charset=x-user-defined');
203 try { 203 } catch (err) {
204 // for older IE versions, the value in responseText is not usable 204 // ignore any error, just to make both FF and IE work
205 if (IEBinary_getLength(this.responseBody)>0) { 205 }
206 // will get here only for older verson of IE 206 request.send(null);
207 response=this.responseBody; 207
208 } 208 var response=request.responseText;
209 } catch (err) { 209 try {
210 // not IE, do nothing 210 // for older IE versions, the value in responseText is not usable
211 } 211 if (IEBinary_getLength(this.responseBody)>0) {
212 212 // will get here only for older verson of IE
213 var bf=new BinaryFile(response); 213 response=this.responseBody;
214 return bf; 214 }
215} 215 } catch (err) {
216 216 // not IE, do nothing
217 217 }
218// =============================================================== 218
219// Asyncronously load a binary file from the specified URL 219 var bf=new BinaryFile(response);
220// 220 return bf;
221// callback must be a function with one or two arguments: 221}
222// - bf = an object of type BinaryFile 222
223// - optional argument object (used only if callback_arg not undefined) 223
224function FetchBinaryURLAsync(url, callback, callback_arg) { 224// ===============================================================
225 var callback_wrapper = function() { 225// Asyncronously load a binary file from the specified URL
226 if(this.readyState == 4) { 226//
227 var response=this.responseText; 227// callback must be a function with one or two arguments:
228 try { 228// - bf = an object of type BinaryFile
229 // for older IE versions, the value in responseText is not usable 229// - optional argument object (used only if callback_arg not undefined)
230 if (IEBinary_getLength(this.responseBody)>0) { 230function FetchBinaryURLAsync(url, callback, callback_arg) {
231 // will get here only for older verson of IE 231 "use strict";
232 response=this.responseBody; 232 var callback_wrapper = function() {
233 } 233 if(this.readyState === 4) {
234 } catch (err) { 234 var response=this.responseText;
235 // not IE, do nothing 235 try {
236 } 236 // for older IE versions, the value in responseText is not usable
237 237 if (IEBinary_getLength(this.responseBody)>0) {
238 var bf=new BinaryFile(response); 238 // will get here only for older verson of IE
239 if (callback_arg!=null) { 239 response=this.responseBody;
240 callback(bf,callback_arg); 240 }
241 } else { 241 } catch (err) {
242 callback(bf); 242 // not IE, do nothing
243 } 243 }
244 } 244
245 } 245 var bf=new BinaryFile(response);
246 246 if (callback_arg) {
247 var request = new XMLHttpRequest(); 247 callback(bf, callback_arg);
248 request.onreadystatechange = callback_wrapper; 248 } else {
249 request.open("GET", url,true); 249 callback(bf);
250 try { 250 }
251 request.overrideMimeType('text/plain; charset=x-user-defined'); 251 }
252 } catch (err) { 252 };
253 // ignore any error, just to make both FF and IE work 253
254 } 254 var request = new XMLHttpRequest();
255 request.send(null); 255 request.onreadystatechange = callback_wrapper;
256 return request 256 request.open("GET", url,true);
257} 257 try {
258 request.overrideMimeType('text/plain; charset=x-user-defined');
259 } catch (err) {
260 // ignore any error, just to make both FF and IE work
261 }
262 request.send(null);
263 return request;
264}
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