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45 changes: 45 additions & 0 deletions
45
app/src/main/java/io/legado/app/utils/ByteArrayExtensions.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package io.legado.app.utils | ||
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| /** | ||
| * Search the data byte array for the first occurrence | ||
| * of the byte array pattern. | ||
| */ | ||
| fun ByteArray.indexOf(pattern: ByteArray, start: Int = 0, stop: Int = size): Int { | ||
| val data = this | ||
| val failure: IntArray = computeFailure(pattern) | ||
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| var j = 0 | ||
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| for (i in start until stop) { | ||
| while (j > 0 && pattern[j] != data[i]) { | ||
| j = failure[j - 1] | ||
| } | ||
| if (pattern[j] == data[i]) { | ||
| j++ | ||
| } | ||
| if (j == pattern.size) { | ||
| return i - pattern.size + 1 | ||
| } | ||
| } | ||
| return -1 | ||
| } | ||
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| /** | ||
| * Computes the failure function using a boot-strapping process, | ||
| * where the pattern is matched against itself. | ||
| */ | ||
| private fun computeFailure(pattern: ByteArray): IntArray { | ||
| val failure = IntArray(pattern.size) | ||
| var j = 0 | ||
| for (i in 1 until pattern.size) { | ||
| while (j > 0 && pattern[j] != pattern[i]) { | ||
| j = failure[j - 1] | ||
| } | ||
| if (pattern[j] == pattern[i]) { | ||
| j++ | ||
| } | ||
| failure[i] = j | ||
| } | ||
| return failure | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package io.legado.app.utils | ||
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| import okio.Buffer | ||
| import okio.EOFException | ||
| import okio.GzipSource | ||
| import okio.Source | ||
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| class GzipSourceCompat(source: Source) : Source { | ||
| private val delegate = GzipSource(source) | ||
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| override fun close() = delegate.close() | ||
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| override fun read(sink: Buffer, byteCount: Long): Long { | ||
| try { | ||
| return delegate.read(sink, byteCount) | ||
| } catch (e: EOFException) { | ||
| if (e.message == "source exhausted prematurely") { | ||
| return -1 | ||
| } | ||
| throw e | ||
| } | ||
| } | ||
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| override fun timeout() = delegate.timeout() | ||
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| } |
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