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don't chunk tar reads for no reason (faster)

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a dinosaur
2024-11-12 18:37:46 +11:00
parent 089a7dcfe1
commit cee34c6f7a
1 changed files with 19 additions and 16 deletions
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35
Sources/apk/Utility/TarMemoryReader.swift
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@ -24,7 +24,9 @@ public struct TarReader {
while true {
let tarBlock = try stream.read(Self.tarBlockSize)
if tarBlock.isEmpty { break }
if tarBlock.count < Self.tarBlockSize { throw TarError.unexpectedEndOfStream }
guard tarBlock.count == Self.tarBlockSize else {
throw TarError.unexpectedEndOfStream
}
let type = UnicodeScalar(tarBlock[Self.tarTypeOffset])
switch type {
@ -34,23 +36,24 @@ public struct TarReader {
let size = try Self.readSize(tarBlock)
// Read file data
var data = Data()
var bytesRemaining = size, readAmount = 0
while bytesRemaining > 0 {
//FIXME: just read the whole thing at once tbh
readAmount = min(bytesRemaining, Self.tarBlockSize)
let block = try stream.read(readAmount)
if block.count < readAmount { throw TarError.unexpectedEndOfStream }
data += block
bytesRemaining -= readAmount
var data = Data(count: size)
if size > 0 {
try data.withUnsafeMutableBytes {
guard size == (try stream.read(
$0.baseAddress!.assumingMemoryBound(to: UInt8.self),
maxLength: size)) else {
throw TarError.unexpectedEndOfStream
}
}
// Seek to next block boundry
let blockN1 = Self.tarBlockSize - 1
let seekAmount = blockN1 - ((size + blockN1) % Self.tarBlockSize) // 511 − ((size − 1) & 0x1FF)
if seekAmount > 0 {
try stream.seek(.current(seekAmount))
}
}
entries.append(.file(name: name, data: data))
// Seek to next block
let seekAmount = Self.tarBlockSize - readAmount
if seekAmount > 0 {
try stream.seek(.current(seekAmount))
}
entries.append(.file(name: name, data: data))
case "5":
// Directory
let name = try Self.readName(tarBlock)