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63 changes: 63 additions & 0 deletions
63
hutool-core/src/main/java/cn/hutool/core/io/LimitedInputStream.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package cn.hutool.core.io; | ||
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| import java.io.FilterInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| /** | ||
| * 限制读取最大长度的{@link FilterInputStream} 实现<br> | ||
| * 来自：https://github.com/skylot/jadx/blob/master/jadx-plugins/jadx-plugins-api/src/main/java/jadx/api/plugins/utils/LimitedInputStream.java | ||
| * | ||
| * @author jadx | ||
| */ | ||
| public class LimitedInputStream extends FilterInputStream { | ||
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| private final long maxSize; | ||
| private long currentPos; | ||
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| /** | ||
| * 构造 | ||
| * @param in {@link InputStream} | ||
| * @param maxSize 限制最大读取量，单位byte | ||
| */ | ||
| public LimitedInputStream(InputStream in, long maxSize) { | ||
| super(in); | ||
| this.maxSize = maxSize; | ||
| } | ||
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| @Override | ||
| public int read() throws IOException { | ||
| final int data = super.read(); | ||
| if (data != -1) { | ||
| currentPos++; | ||
| checkPos(); | ||
| } | ||
| return data; | ||
| } | ||
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| @Override | ||
| public int read(byte[] b, int off, int len) throws IOException { | ||
| final int count = super.read(b, off, len); | ||
| if (count > 0) { | ||
| currentPos += count; | ||
| checkPos(); | ||
| } | ||
| return count; | ||
| } | ||
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| @Override | ||
| public long skip(long n) throws IOException { | ||
| final long skipped = super.skip(n); | ||
| if (skipped != 0) { | ||
| currentPos += skipped; | ||
| checkPos(); | ||
| } | ||
| return skipped; | ||
| } | ||
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| private void checkPos() { | ||
| if (currentPos > maxSize) { | ||
| throw new IllegalStateException("Read limit exceeded"); | ||
| } | ||
| } | ||
| } |
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