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41 lines
2.6 KiB
JavaScript
41 lines
2.6 KiB
JavaScript
'use strict';
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const createBufferReader = require("../../buffer-reader");
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const parseDirectoryRecord = require("../directory-record");
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module.exports = function parsePrimaryVolumeDescriptor(data, encoding = "ascii") {
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let bufferReader = createBufferReader(data, {
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encoding: encoding
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});
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/* NOTE: Technically, the spec states that we should use strA and strD in a primary volume descriptor, and not strA1 and strD1. However, using the encoding-specific versions makes it easier to base the supplementary volume descriptor parser on this one, and since this parser defaults to an 'ascii' encoding anyway, it doesn't matter from a functional perspective. */
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return {
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systemIdentifier: bufferReader.strA1(1, 32),
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volumeIdentifier: bufferReader.strD1(33, 32),
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sectorCount: bufferReader.int32_LSB_MSB(73),
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setSize: bufferReader.int16_LSB_MSB(113),
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sequenceNumber: bufferReader.int16_LSB_MSB(117),
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sectorSize: bufferReader.int16_LSB_MSB(121),
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pathTableSize: bufferReader.int32_LSB_MSB(125),
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pathTableLocationL: bufferReader.int32_LSB(133), // FIXME: Pointer? (location is expressed in 'sectors')
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optionalPathTableLocationL: bufferReader.int32_LSB(137), // FIXME: Pointer? (location is expressed in 'sectors')
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pathTableLocationM: bufferReader.int32_MSB(141), // FIXME: Pointer? (location is expressed in 'sectors')
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optionalPathTableLocationM: bufferReader.int32_MSB(145), // FIXME: Pointer? (location is expressed in 'sectors')
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rootDirectory: parseDirectoryRecord(bufferReader.slice(149, 34), {encoding: encoding}),
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volumeSetIdentifier: bufferReader.strD1(183, 128),
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publisherIdentifier: bufferReader.strA1(311, 128), // FIXME: null for unspecified & extended publisher information
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dataPreparerIdentifier: bufferReader.strA1(439, 128), // FIXME: null for unspecified & extended publisher information
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applicationIdentifier: bufferReader.strA1(567, 128), // FIXME: null for unspecified & extended publisher information
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copyrightFile: bufferReader.strD1(695, 36), // FIXME: seek for file, optionally?
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abstractFile: bufferReader.strD1(732, 36), // FIXME: seek for file, optionally?
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bibliographicFile: bufferReader.strD1(769, 36), // FIXME: seek for file, optionally?
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creationDate: bufferReader.decDatetime(806),
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modificationDate: bufferReader.decDatetime(823),
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expirationDate: bufferReader.decDatetime(840),
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effectiveDate: bufferReader.decDatetime(857),
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fileStructureVersion: bufferReader.int8(874),
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applicationData: data.slice(876, 876 + 512)
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}
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};
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