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zlib-based homecooked gzip reader for significantly faster decompression times

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a dinosaur
2024-11-12 09:37:46 +11:00
parent cf5e1a3f35
commit 089a7dcfe1
7 changed files with 256 additions and 14 deletions
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36
Sources/apk/Index/ApkIndexUpdate.swift
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@ -4,7 +4,6 @@
*/
import Foundation
import SWCompression
import CryptoKit
public struct ApkIndexUpdater {
@ -64,23 +63,46 @@ public struct ApkIndexUpdater {
let tarSignature: [TarReader.Entry]
let tarRecords: [TarReader.Entry]
let tars = try GzipArchive.multiUnarchive( // Slow...
archive: Data(contentsOf: indexURL))
assert(tars.count >= 2)
print("Archive: \(indexURL.lastPathComponent)")
var signatureStream = MemoryInputStream(buffer: tars[0].data)
let durFormat = Duration.UnitsFormatStyle(
allowedUnits: [ .seconds, .milliseconds ],
width: .condensedAbbreviated,
fractionalPart: .show(length: 3))
let gzipStart = ContinuousClock.now
var tars = [Data]()
do {
var file: any InputStream = try FileInputStream(indexURL)
//var file: any InputStream = try MemoryInputStream(buffer: try Data(contentsOf: indexURL))
tars.append(try GZip.read(inStream: &file))
tars.append(try GZip.read(inStream: &file))
} catch {
fatalError(error.localizedDescription)
}
print("Gzip time: \((ContinuousClock.now - gzipStart).formatted(durFormat))")
let untarStart = ContinuousClock.now
var signatureStream = MemoryInputStream(buffer: tars[0])
tarSignature = try TarReader.read(&signatureStream)
var recordsStream = MemoryInputStream(buffer: tars[1].data)
var recordsStream = MemoryInputStream(buffer: tars[1])
tarRecords = try TarReader.read(&recordsStream)
guard case .file(let signatureName, _) = tarSignature.first
else { fatalError("Missing signature") }
print(signatureName)
guard let apkIndexFile = tarRecords.firstFile(name: "APKINDEX")
else { fatalError("APKINDEX missing") }
guard let description = tarRecords.firstFile(name: "DESCRIPTION")
else { fatalError("DESCRIPTION missing") }
print("TAR time: \((ContinuousClock.now - untarStart).formatted(durFormat))")
let indexStart = ContinuousClock.now
defer {
print("Index time: \((ContinuousClock.now - indexStart).formatted(durFormat))")
}
let reader = TextInputStream(binaryStream: MemoryInputStream(buffer: apkIndexFile))
return try ApkIndex(raw:
try ApkRawIndex(lines: reader.lines))