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38 lines
1 KiB
JavaScript
38 lines
1 KiB
JavaScript
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var binary = require('binary');
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module.exports = function(extraField, vars) {
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var extra;
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// Find the ZIP64 header, if present.
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while(!extra && extraField && extraField.length) {
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var candidateExtra = binary.parse(extraField)
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.word16lu('signature')
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.word16lu('partsize')
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.word64lu('uncompressedSize')
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.word64lu('compressedSize')
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.word64lu('offset')
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.word64lu('disknum')
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.vars;
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if(candidateExtra.signature === 0x0001) {
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extra = candidateExtra;
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} else {
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// Advance the buffer to the next part.
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// The total size of this part is the 4 byte header + partsize.
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extraField = extraField.slice(candidateExtra.partsize + 4);
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}
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}
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extra = extra || {};
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if (vars.compressedSize === 0xffffffff)
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vars.compressedSize = extra.compressedSize;
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if (vars.uncompressedSize === 0xffffffff)
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vars.uncompressedSize= extra.uncompressedSize;
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if (vars.offsetToLocalFileHeader === 0xffffffff)
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vars.offsetToLocalFileHeader= extra.offset;
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return extra;
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};
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