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2 | /*
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3 | * Binary Ajax 0.1.10
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4 | * Copyright (c) 2008 Jacob Seidelin, [email protected], http://blog.nihilogic.dk/
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5 | * Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt]
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6 | */
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7 |
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8 |
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9 | var BinaryFile = function(strData, iDataOffset, iDataLength) {
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10 | var data = strData;
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11 | var dataOffset = iDataOffset || 0;
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12 | var dataLength = 0;
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13 |
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14 | this.getRawData = function() {
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15 | return data;
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16 | }
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17 |
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18 | if (typeof strData === "string") {
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19 | dataLength = iDataLength || data.length;
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20 |
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21 | this.getByteAt = function(iOffset) {
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22 | return data.charCodeAt(iOffset + dataOffset) & 0xFF;
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23 | }
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24 |
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25 | this.getBytesAt = function(iOffset, iLength) {
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26 | var aBytes = [];
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27 |
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28 | for (var i = 0; i < iLength; i++) {
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29 | aBytes[i] = data.charCodeAt((iOffset + i) + dataOffset) & 0xFF
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30 | };
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31 |
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32 | return aBytes;
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33 | }
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34 | } else if (typeof strData === "unknown") {
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35 | dataLength = iDataLength || IEBinary_getLength(data);
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36 |
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37 | this.getByteAt = function(iOffset) {
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38 | return IEBinary_getByteAt(data, iOffset + dataOffset);
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39 | }
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40 |
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41 | this.getBytesAt = function(iOffset, iLength) {
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42 | return new VBArray(IEBinary_getBytesAt(data, iOffset + dataOffset, iLength)).toArray();
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43 | }
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44 | }
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45 |
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46 | this.getLength = function() {
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47 | return dataLength;
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48 | }
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49 |
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50 | this.getSByteAt = function(iOffset) {
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51 | var iByte = this.getByteAt(iOffset);
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52 | if (iByte > 127)
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53 | return iByte - 256;
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54 | else
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55 | return iByte;
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56 | }
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57 |
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58 | this.getShortAt = function(iOffset, bBigEndian) {
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59 | var iShort = bBigEndian ?
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60 | (this.getByteAt(iOffset) << 8) + this.getByteAt(iOffset + 1)
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61 | : (this.getByteAt(iOffset + 1) << 8) + this.getByteAt(iOffset)
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62 | if (iShort < 0) iShort += 65536;
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63 | return iShort;
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64 | }
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65 | this.getSShortAt = function(iOffset, bBigEndian) {
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66 | var iUShort = this.getShortAt(iOffset, bBigEndian);
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67 | if (iUShort > 32767)
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68 | return iUShort - 65536;
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69 | else
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70 | return iUShort;
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71 | }
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72 | this.getLongAt = function(iOffset, bBigEndian) {
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73 | var iByte1 = this.getByteAt(iOffset),
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74 | iByte2 = this.getByteAt(iOffset + 1),
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75 | iByte3 = this.getByteAt(iOffset + 2),
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76 | iByte4 = this.getByteAt(iOffset + 3);
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77 |
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78 | var iLong = bBigEndian ?
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79 | (((((iByte1 << 8) + iByte2) << 8) + iByte3) << 8) + iByte4
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80 | : (((((iByte4 << 8) + iByte3) << 8) + iByte2) << 8) + iByte1;
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81 | if (iLong < 0) iLong += 4294967296;
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82 | return iLong;
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83 | }
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84 | this.getSLongAt = function(iOffset, bBigEndian) {
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85 | var iULong = this.getLongAt(iOffset, bBigEndian);
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86 | if (iULong > 2147483647)
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87 | return iULong - 4294967296;
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88 | else
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89 | return iULong;
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90 | }
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91 |
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92 | this.getStringAt = function(iOffset, iLength) {
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93 | var aStr = [];
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94 |
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95 | var aBytes = this.getBytesAt(iOffset, iLength);
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96 | for (var j=0; j < iLength; j++) {
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97 | aStr[j] = String.fromCharCode(aBytes[j]);
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98 | }
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99 | return aStr.join("");
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100 | }
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101 |
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102 | this.getCharAt = function(iOffset) {
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103 | return String.fromCharCode(this.getByteAt(iOffset));
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104 | }
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105 | this.toBase64 = function() {
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106 | return window.btoa(data);
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107 | }
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108 | this.fromBase64 = function(strBase64) {
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109 | data = window.atob(strBase64);
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110 | }
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111 | }
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112 |
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113 |
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114 | var BinaryAjax = (function() {
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115 |
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116 | function createRequest() {
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117 | var oHTTP = null;
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118 | if (window.ActiveXObject) {
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119 | oHTTP = new ActiveXObject("Microsoft.XMLHTTP");
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120 | } else if (window.XMLHttpRequest) {
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121 | oHTTP = new XMLHttpRequest();
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122 | }
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123 | return oHTTP;
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124 | }
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125 |
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126 | function getHead(strURL, fncCallback, fncError) {
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127 | var oHTTP = createRequest();
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128 | if (oHTTP) {
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129 | if (fncCallback) {
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130 | if (typeof(oHTTP.onload) != "undefined") {
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131 | oHTTP.onload = function() {
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132 | if (oHTTP.status === "200") {
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133 | fncCallback(this);
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134 | } else {
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135 | if (fncError) fncError();
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136 | }
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137 | oHTTP = null;
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138 | };
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139 | } else {
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140 | oHTTP.onreadchange = function() {
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141 | if (oHTTP.readyState === 4) {
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142 | if (oHTTP.status === "200") {
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143 | fncCallback(this);
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144 | } else {
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145 | if (fncError) fncError();
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146 | }
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147 | oHTTP = null;
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148 | }
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149 | };
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150 | }
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151 | }
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152 | oHTTP.open("HEAD", strURL, true);
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153 | oHTTP.send(null);
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154 | } else {
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155 | if (fncError) fncError();
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156 | }
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157 | }
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158 |
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159 | function sendRequest(strURL, fncCallback, fncError, aRange, bAcceptRanges, iFileSize) {
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160 | var oHTTP = createRequest();
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161 | if (oHTTP) {
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162 |
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163 | var iDataOffset = 0;
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164 | if (aRange && !bAcceptRanges) {
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165 | iDataOffset = aRange[0];
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166 | }
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167 | var iDataLen = 0;
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168 | if (aRange) {
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169 | iDataLen = aRange[1]-aRange[0]+1;
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170 | }
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171 |
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172 | if (fncCallback) {
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173 | if (typeof(oHTTP.onload) != "undefined") {
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174 | oHTTP.onload = function() {
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175 | if (oHTTP.status === "200" || oHTTP.status === "206" || oHTTP.status === "0") {
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176 | oHTTP.binaryResponse = new BinaryFile(oHTTP.responseText, iDataOffset, iDataLen);
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177 | oHTTP.fileSize = iFileSize || oHTTP.getResponseHeader("Content-Length");
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178 | fncCallback(oHTTP);
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179 | } else {
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180 | if (fncError) fncError();
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181 | }
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182 | oHTTP = null;
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183 | };
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184 | } else {
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185 | oHTTP.onreadchange = function() {
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186 | if (oHTTP.readyState === 4) {
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187 | if (oHTTP.status === "200" || oHTTP.status === "206" || oHTTP.status === "0") {
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188 | // IE6 craps if we try to extend the XHR object
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189 | var oRes = {
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190 | status : oHTTP.status,
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191 | // IE needs responseBody, Chrome/Safari needs responseText
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192 | binaryResponse : new BinaryFile(
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193 | typeof oHTTP.responseBody === "unknown" ? oHTTP.responseBody : oHTTP.responseText, iDataOffset, iDataLen
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194 | ),
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195 | fileSize : iFileSize || oHTTP.getResponseHeader("Content-Length")
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196 | };
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197 | fncCallback(oRes);
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198 | } else {
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199 | if (fncError) fncError();
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200 | }
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201 | oHTTP = null;
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202 | }
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203 | };
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204 | }
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205 | }
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206 | oHTTP.open("GET", strURL, true);
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207 |
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208 | if (oHTTP.overrideMimeType) oHTTP.overrideMimeType('text/plain; charset=x-user-defined');
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209 |
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210 | if (aRange && bAcceptRanges) {
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211 | oHTTP.setRequestHeader("Range", "bytes=" + aRange[0] + "-" + aRange[1]);
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212 | }
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213 |
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214 | oHTTP.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 1970 00:00:00 GMT");
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215 |
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216 | oHTTP.send(null);
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217 | } else {
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218 | if (fncError) fncError();
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219 | }
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220 | }
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221 |
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222 | return function(strURL, fncCallback, fncError, aRange) {
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223 |
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224 | if (aRange) {
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225 | getHead(
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226 | strURL,
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227 | function(oHTTP) {
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228 | var iLength = parseInt(oHTTP.getResponseHeader("Content-Length"),10);
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229 | var strAcceptRanges = oHTTP.getResponseHeader("Accept-Ranges");
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230 |
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231 | var iStart, iEnd;
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232 | iStart = aRange[0];
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233 | if (aRange[0] < 0)
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234 | iStart += iLength;
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235 | iEnd = iStart + aRange[1] - 1;
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236 |
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237 | sendRequest(strURL, fncCallback, fncError, [iStart, iEnd], (strAcceptRanges === "bytes"), iLength);
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238 | }
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239 | );
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240 |
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241 | } else {
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242 | sendRequest(strURL, fncCallback, fncError);
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243 | }
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244 | }
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245 |
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246 | }());
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247 |
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248 | /*
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249 | document.write(
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250 | "<script type='text/vbscript'>\r\n"
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251 | + "Function IEBinary_getByteAt(strBinary, iOffset)\r\n"
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252 | + " IEBinary_getByteAt = AscB(MidB(strBinary,iOffset+1,1))\r\n"
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253 | + "End Function\r\n"
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254 | + "Function IEBinary_getLength(strBinary)\r\n"
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255 | + " IEBinary_getLength = LenB(strBinary)\r\n"
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256 | + "End Function\r\n"
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257 | + "</script>\r\n"
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258 | );
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259 | */
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260 |
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261 | document.write(
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262 | "<script type='text/vbscript'>\r\n"
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263 | + "Function IEBinary_getByteAt(strBinary, iOffset)\r\n"
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264 | + " IEBinary_getByteAt = AscB(MidB(strBinary, iOffset + 1, 1))\r\n"
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265 | + "End Function\r\n"
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266 | + "Function IEBinary_getBytesAt(strBinary, iOffset, iLength)\r\n"
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267 | + " Dim aBytes()\r\n"
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268 | + " ReDim aBytes(iLength - 1)\r\n"
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269 | + " For i = 0 To iLength - 1\r\n"
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270 | + " aBytes(i) = IEBinary_getByteAt(strBinary, iOffset + i)\r\n"
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271 | + " Next\r\n"
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272 | + " IEBinary_getBytesAt = aBytes\r\n"
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273 | + "End Function\r\n"
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274 | + "Function IEBinary_getLength(strBinary)\r\n"
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275 | + " IEBinary_getLength = LenB(strBinary)\r\n"
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276 | + "End Function\r\n"
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277 | + "</script>\r\n"
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278 | );
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