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Fix parsing of GRIB2 files without Section 2 (Local Use Section) #2

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Fix parsing of GRIB2 files without Section 2 (Local Use Section) #2

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14 changes: 12 additions & 2 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -300,8 +300,18 @@ function parseAllSections(gribBuffer, startIndex) {
}

const section1 = parseSection1(gribBuffer, section0.startIndex + section0.lengthOfRawData)
const section2 = parseSection2(gribBuffer, section1.startIndex + section1.lengthOfRawData)
const section3 = parseSection3(gribBuffer, section2.startIndex + section2.lengthOfRawData)

// Check if Section 2 (Local Use Section) is present - it's optional in GRIB2
let nextPos = section1.startIndex + section1.lengthOfRawData
const nextSectionNumber = gribBuffer[nextPos + 4]

let section2 = null
if (nextSectionNumber === 2) {
section2 = parseSection2(gribBuffer, nextPos)
nextPos = section2.startIndex + section2.lengthOfRawData
}

const section3 = parseSection3(gribBuffer, nextPos)
const section4 = parseSection4(gribBuffer, section3.startIndex + section3.lengthOfRawData, section1.data.referenceTimestamp)
const section5 = parseSection5(gribBuffer, section4.startIndex + section4.lengthOfRawData)
const section6 = parseSection6(gribBuffer, section5.startIndex + section5.lengthOfRawData)
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