GZIPOutputStream problem with my class which extending OutputStream
0
I have following problem. I have written Stream class, which extends OutputStream. Here is a code:
import java.io.IOException;
import java.io.OutputStream;
public class ToUpperLetterOutputStream extends OutputStream {
public OutputStream outputStream;
public ToUpperLetterOutputStream(OutputStream outputStream)
{
this.outputStream = outputStream;
}
@Override
public void write(int b) {
char ch = toUpper((char)b);
try {
outputStream.write((int)ch);
} catch (IOException e) {
System.err.println("IO ERROR");
}
}
protected char toUpper(int b)
{
char ch = (char)b;
if (Character.isLowerCase(b))
{
ch = Character.toUpperCase(ch);
}
return ch;
}
}
Now I'm trying to use my stream with GZIPOutputStream:
byte bytes = stringBuilder.toString().getBytes();
try (
GZIPOutputStream g = new GZIPOutputStream( new ToUpperLetterOutputStream(
new FileOutputStream("result")))) {
g.write(bytes, 0, bytes.length);
g.finish();
} catch (FileNotFoundException e) {
System.err.println("Nie znaleziono pliku");
} catch (IOException e) {
System.err.println("IO Error");
}
Program works fine, but when I am trying to decompress my result file, I'm getting following exception:
java.util.zip.ZipException: invalid literal/lengths set
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164)
at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:117)
at java.io.FilterInputStream.read(FilterInputStream.java:107)
at Test.decompressGzipFile(Test.java:36)
at Test.main(Test.java:50)
When I am not using my Stream, decompression works fine. Why is that happening and what should I change to make this code correct?
java outputstream extending gzipoutputstream
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
|
show 1 more comment
0
I have following problem. I have written Stream class, which extends OutputStream. Here is a code:
import java.io.IOException;
import java.io.OutputStream;
public class ToUpperLetterOutputStream extends OutputStream {
public OutputStream outputStream;
public ToUpperLetterOutputStream(OutputStream outputStream)
{
this.outputStream = outputStream;
}
@Override
public void write(int b) {
char ch = toUpper((char)b);
try {
outputStream.write((int)ch);
} catch (IOException e) {
System.err.println("IO ERROR");
}
}
protected char toUpper(int b)
{
char ch = (char)b;
if (Character.isLowerCase(b))
{
ch = Character.toUpperCase(ch);
}
return ch;
}
}
Now I'm trying to use my stream with GZIPOutputStream:
byte bytes = stringBuilder.toString().getBytes();
try (
GZIPOutputStream g = new GZIPOutputStream( new ToUpperLetterOutputStream(
new FileOutputStream("result")))) {
g.write(bytes, 0, bytes.length);
g.finish();
} catch (FileNotFoundException e) {
System.err.println("Nie znaleziono pliku");
} catch (IOException e) {
System.err.println("IO Error");
}
Program works fine, but when I am trying to decompress my result file, I'm getting following exception:
java.util.zip.ZipException: invalid literal/lengths set
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164)
at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:117)
at java.io.FilterInputStream.read(FilterInputStream.java:107)
at Test.decompressGzipFile(Test.java:36)
at Test.main(Test.java:50)
When I am not using my Stream, decompression works fine. Why is that happening and what should I change to make this code correct?
java outputstream extending gzipoutputstream
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
What did you expect to happens? You corrupt stream.
– talex
Nov 21 '18 at 10:25
I do not quite understand why this operation is corrupting stream. If I extend OutputStream and only change small letters to big, what is a reason of corruption of stream?
– MikolajMGT
Nov 21 '18 at 10:30
1
In you exampleGZIPOutputStreamstore data using your stream. Try to zip some file. Open it in editor and replace small letters to big. Then try unzip.
– talex
Nov 21 '18 at 10:38
Okay, so I builded streams in wrong order. I changed it toBufferedOutputStream g = new BufferedOutputStream(new ToUpperLetterOutputStream( new GZIPOutputStream(new FileOutputStream("result")))))But now I am not able to call finish() method from GZIPOutputStream, which also corrupts my result file. Is there any way to handle it?
– MikolajMGT
Nov 21 '18 at 10:52
1
You should forward calls toflush()andclose()to your underlying OutputStream. The best way would be to extend FilterOutputStream, which is made exactly for such situation.
– vanje
Nov 21 '18 at 11:00
|
show 1 more comment
0
0
0
I have following problem. I have written Stream class, which extends OutputStream. Here is a code:
import java.io.IOException;
import java.io.OutputStream;
public class ToUpperLetterOutputStream extends OutputStream {
public OutputStream outputStream;
public ToUpperLetterOutputStream(OutputStream outputStream)
{
this.outputStream = outputStream;
}
@Override
public void write(int b) {
char ch = toUpper((char)b);
try {
outputStream.write((int)ch);
} catch (IOException e) {
System.err.println("IO ERROR");
}
}
protected char toUpper(int b)
{
char ch = (char)b;
if (Character.isLowerCase(b))
{
ch = Character.toUpperCase(ch);
}
return ch;
}
}
Now I'm trying to use my stream with GZIPOutputStream:
byte bytes = stringBuilder.toString().getBytes();
try (
GZIPOutputStream g = new GZIPOutputStream( new ToUpperLetterOutputStream(
new FileOutputStream("result")))) {
g.write(bytes, 0, bytes.length);
g.finish();
} catch (FileNotFoundException e) {
System.err.println("Nie znaleziono pliku");
} catch (IOException e) {
System.err.println("IO Error");
}
Program works fine, but when I am trying to decompress my result file, I'm getting following exception:
java.util.zip.ZipException: invalid literal/lengths set
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164)
at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:117)
at java.io.FilterInputStream.read(FilterInputStream.java:107)
at Test.decompressGzipFile(Test.java:36)
at Test.main(Test.java:50)
When I am not using my Stream, decompression works fine. Why is that happening and what should I change to make this code correct?
java outputstream extending gzipoutputstream
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
I have following problem. I have written Stream class, which extends OutputStream. Here is a code:
import java.io.IOException;
import java.io.OutputStream;
public class ToUpperLetterOutputStream extends OutputStream {
public OutputStream outputStream;
public ToUpperLetterOutputStream(OutputStream outputStream)
{
this.outputStream = outputStream;
}
@Override
public void write(int b) {
char ch = toUpper((char)b);
try {
outputStream.write((int)ch);
} catch (IOException e) {
System.err.println("IO ERROR");
}
}
protected char toUpper(int b)
{
char ch = (char)b;
if (Character.isLowerCase(b))
{
ch = Character.toUpperCase(ch);
}
return ch;
}
}
Now I'm trying to use my stream with GZIPOutputStream:
byte bytes = stringBuilder.toString().getBytes();
try (
GZIPOutputStream g = new GZIPOutputStream( new ToUpperLetterOutputStream(
new FileOutputStream("result")))) {
g.write(bytes, 0, bytes.length);
g.finish();
} catch (FileNotFoundException e) {
System.err.println("Nie znaleziono pliku");
} catch (IOException e) {
System.err.println("IO Error");
}
Program works fine, but when I am trying to decompress my result file, I'm getting following exception:
java.util.zip.ZipException: invalid literal/lengths set
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164)
at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:117)
at java.io.FilterInputStream.read(FilterInputStream.java:107)
at Test.decompressGzipFile(Test.java:36)
at Test.main(Test.java:50)
When I am not using my Stream, decompression works fine. Why is that happening and what should I change to make this code correct?
java outputstream extending gzipoutputstream
java outputstream extending gzipoutputstream
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
asked Nov 21 '18 at 10:18
MikolajMGTMikolajMGT
407
407
What did you expect to happens? You corrupt stream.
– talex
Nov 21 '18 at 10:25
I do not quite understand why this operation is corrupting stream. If I extend OutputStream and only change small letters to big, what is a reason of corruption of stream?
– MikolajMGT
Nov 21 '18 at 10:30
1
In you exampleGZIPOutputStreamstore data using your stream. Try to zip some file. Open it in editor and replace small letters to big. Then try unzip.
– talex
Nov 21 '18 at 10:38
Okay, so I builded streams in wrong order. I changed it toBufferedOutputStream g = new BufferedOutputStream(new ToUpperLetterOutputStream( new GZIPOutputStream(new FileOutputStream("result")))))But now I am not able to call finish() method from GZIPOutputStream, which also corrupts my result file. Is there any way to handle it?
– MikolajMGT
Nov 21 '18 at 10:52
1
You should forward calls toflush()andclose()to your underlying OutputStream. The best way would be to extend FilterOutputStream, which is made exactly for such situation.
– vanje
Nov 21 '18 at 11:00
|
show 1 more comment
What did you expect to happens? You corrupt stream.
– talex
Nov 21 '18 at 10:25
I do not quite understand why this operation is corrupting stream. If I extend OutputStream and only change small letters to big, what is a reason of corruption of stream?
– MikolajMGT
Nov 21 '18 at 10:30
1
In you exampleGZIPOutputStreamstore data using your stream. Try to zip some file. Open it in editor and replace small letters to big. Then try unzip.
– talex
Nov 21 '18 at 10:38
Okay, so I builded streams in wrong order. I changed it toBufferedOutputStream g = new BufferedOutputStream(new ToUpperLetterOutputStream( new GZIPOutputStream(new FileOutputStream("result")))))But now I am not able to call finish() method from GZIPOutputStream, which also corrupts my result file. Is there any way to handle it?
– MikolajMGT
Nov 21 '18 at 10:52
1
You should forward calls toflush()andclose()to your underlying OutputStream. The best way would be to extend FilterOutputStream, which is made exactly for such situation.
– vanje
Nov 21 '18 at 11:00
What did you expect to happens? You corrupt stream.
– talex
Nov 21 '18 at 10:25
What did you expect to happens? You corrupt stream.
– talex
Nov 21 '18 at 10:25
I do not quite understand why this operation is corrupting stream. If I extend OutputStream and only change small letters to big, what is a reason of corruption of stream?
– MikolajMGT
Nov 21 '18 at 10:30
I do not quite understand why this operation is corrupting stream. If I extend OutputStream and only change small letters to big, what is a reason of corruption of stream?
– MikolajMGT
Nov 21 '18 at 10:30
1
1
In you example
GZIPOutputStream store data using your stream. Try to zip some file. Open it in editor and replace small letters to big. Then try unzip.– talex
Nov 21 '18 at 10:38
In you example
GZIPOutputStream store data using your stream. Try to zip some file. Open it in editor and replace small letters to big. Then try unzip.– talex
Nov 21 '18 at 10:38
Okay, so I builded streams in wrong order. I changed it to
BufferedOutputStream g = new BufferedOutputStream(new ToUpperLetterOutputStream( new GZIPOutputStream(new FileOutputStream("result"))))) But now I am not able to call finish() method from GZIPOutputStream, which also corrupts my result file. Is there any way to handle it?– MikolajMGT
Nov 21 '18 at 10:52
Okay, so I builded streams in wrong order. I changed it to
BufferedOutputStream g = new BufferedOutputStream(new ToUpperLetterOutputStream( new GZIPOutputStream(new FileOutputStream("result"))))) But now I am not able to call finish() method from GZIPOutputStream, which also corrupts my result file. Is there any way to handle it?– MikolajMGT
Nov 21 '18 at 10:52
1
1
You should forward calls to
flush() and close() to your underlying OutputStream. The best way would be to extend FilterOutputStream, which is made exactly for such situation.– vanje
Nov 21 '18 at 11:00
You should forward calls to
flush() and close() to your underlying OutputStream. The best way would be to extend FilterOutputStream, which is made exactly for such situation.– vanje
Nov 21 '18 at 11:00
|
show 1 more comment
0
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What did you expect to happens? You corrupt stream.
– talex
Nov 21 '18 at 10:25
I do not quite understand why this operation is corrupting stream. If I extend OutputStream and only change small letters to big, what is a reason of corruption of stream?
– MikolajMGT
Nov 21 '18 at 10:30
1
In you example
GZIPOutputStreamstore data using your stream. Try to zip some file. Open it in editor and replace small letters to big. Then try unzip.– talex
Nov 21 '18 at 10:38
Okay, so I builded streams in wrong order. I changed it to
BufferedOutputStream g = new BufferedOutputStream(new ToUpperLetterOutputStream( new GZIPOutputStream(new FileOutputStream("result")))))But now I am not able to call finish() method from GZIPOutputStream, which also corrupts my result file. Is there any way to handle it?– MikolajMGT
Nov 21 '18 at 10:52
1
You should forward calls to
flush()andclose()to your underlying OutputStream. The best way would be to extend FilterOutputStream, which is made exactly for such situation.– vanje
Nov 21 '18 at 11:00