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| 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 | 2x 2x 2x 2x 2x 2x | /**
* Converts a binary buffer in an ArrayBuffer to a string.
*
* Note this does not take encoding into consideration, so don't
* expect proper Unicode or any other encoding.
*/
function arrayBufferToString(arrayBuffer) {
const decoder = new TextDecoder('latin1');
return decoder.decode(arrayBuffer);
}
/**
* Extracts binary data out of a file ArrayBuffer given a prefix/suffix.
*/
function extractBinary(arrayBuffer, prefixRegex, suffixRegex = null) {
const str = arrayBufferToString(arrayBuffer);
const prefixMatch = prefixRegex.exec(str);
if (!prefixMatch) {
return { text: str };
}
const dataStartIndex = prefixMatch.index + prefixMatch[0].length;
const strFirstHalf = str.substring(0, dataStartIndex);
let retVal = null;
const suffixMatch = suffixRegex ? suffixRegex.exec(str) : null;
if (suffixMatch) {
const strSecondHalf = str.substr(suffixMatch.index);
retVal = {
text: strFirstHalf + strSecondHalf,
binaryBuffer: arrayBuffer.slice(dataStartIndex, suffixMatch.index),
};
} else {
// no suffix, so just take all the data starting from dataStartIndex
retVal = {
text: strFirstHalf,
binaryBuffer: arrayBuffer.slice(dataStartIndex),
};
}
return retVal;
}
export default {
arrayBufferToString,
extractBinary,
};
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