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fix seek error for 0 file size records file

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by add extra check for file size = 0 in cleanlast()
- (http://mantis.tokeek.de/view.php?id=411)
This commit is contained in:
reger 2014-07-06 20:49:01 +02:00
parent 1f2eba977d
commit 2b8cc5832c
1 changed files with 11 additions and 6 deletions
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17
source/net/yacy/kelondro/io/Records.java
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@ -116,7 +116,7 @@ public final class Records {
this.buffer = new byte[buffersize];
this.buffercount = 0;
}
public void clear() {
try {
this.raf.setLength(0);
@ -399,10 +399,14 @@ public final class Records {
return;
}
// read entry from the file
final long endpos = this.raf.length() - this.recordsize;
this.raf.seek(endpos);
this.raf.readFully(b, start, this.recordsize);
long endpos = this.raf.length() - this.recordsize;
if (endpos >= 0) { // prevent seek error for 0 size file
this.raf.seek(endpos);
this.raf.readFully(b, start, this.recordsize);
} else {
endpos = 0;
System.arraycopy(this.zero, 0, b, start, this.recordsize);
}
// write zero bytes to the cache and to the file
this.raf.seek(endpos);
this.raf.write(this.zero, 0, this.recordsize);
@ -434,7 +438,8 @@ public final class Records {
return;
}
// shrink file
this.raf.setLength(this.raf.length() - this.recordsize);
if (this.raf.length() > 0) // already 0 length, nothing to shrink (prevent seek io error)
this.raf.setLength(this.raf.length() - this.recordsize);
}
public final void deleteOnExit() {