53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
/**
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* Converts a String to a UInt8 array of character codes
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* @param {String} str Input string
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* @returns {Uint8Array} Uint8 Array of character codes
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*/
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function stringToUint8Array(str) {
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var uint = new Uint8Array(str.length);
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for (var i = 0,j = str.length;i< j;i++){
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uint[i] = str.charCodeAt(i);
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}
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return uint;
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}
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function checkToken(token, data, dataOffset) {
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if (dataOffset + token.length > data.length) {
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//console.log('dataOffset >> ', dataOffset);
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return false;
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}
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for (var i = 0; i < token.length; i++) {
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if (token[i] !== data[endIndex++]) {
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if (endIndex > 520000) {
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console.log('token=',uint8ArrayToString(token));
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console.log('data=', uint8ArrayToString(data, dataOffset, endIndex - dataOffset));
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console.log('miss at %d %s dataOffset=%d', i, String.fromCharCode(data[endIndex]), endIndex);
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console.log('miss at %d %s dataOffset=%d', i, String.fromCharCode(token[endIndex]), endIndex);
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}
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return false;
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}
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}
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return true;
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}
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findIndexOfString = function(data, str, offset) {
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offset = offset || 0;
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var token = stringToUint8Array(str);
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for (var i = offset; i < data.length; i++) {
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if (data[i] === token[0]) {
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//console.log('match @', i);
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if (checkToken(token, data, i)) {
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return i;
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}
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}
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}
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return -1;
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};
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