Compression/Decompression of byte-array in TupleOutput/TupleInput
Hello,
how do I compress the whole data before I flush everything out? I simply want to write to the internal buffer using TupleOutput methods and after that compress the buffer. The decompressing once using the TupleInput reference.
For instance Snappy.compress(byte[]) and Snappy.decompress(byte[]).
Thanks.
kind regards,
Johannes
Perhaps you're expecting to be able to use TupleInputStream as a FilterInputStream, which is is not.
Have you tried implementing the EntryBinding interface? The entryToObject(DatabaseEntry) method gives you the byte array. You can decompress the byte array and then use the byte array to call your tuple binding's entryToObject(DatabaseEntry) method.
In other words, compose two bindings. One binding does the compression/decompression, the other does the tuple serialize/deserialize using the uncompressed byte array.
--mark
Similar Messages
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Tips for shaving a few bytes off a byte array?
Hi, before you give me the standard solution using Inflator and Deflator, Im doing this on a J2ME device (of which there is no solution already implemented for both compression and decompression).
I have a few byte arrays of length 150-300 bytes and just want to squeeze things all tighter if possible. The header information for decoding them should be stored in the resulting byte[] array also.
I know storing a huffman tree would probably be too large for this so I just want suggestions for any tiny things that can be done (ie looking for repetitions of bytes or nibbles in the array)
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Is there a null value that I can put into a byte array?
I have a byte[] that I'm trying to make smaller, at the moment, in order to do so, i'm writing it byte-by-byte to another byte[] called temp. Both are set to the same size, because I don't know exactly what the initial array will compress to.
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The only thing is then when I come to iterate through the byte array to write it to my output array, it throws up an error that I'm trying to compare a byte to a byte[]:
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Ideas on transforming a byte array?
I'm writing a program to compress files - I read it in, transform it and then write it out again. I'm just having a little confusion with the transforming.
I'm keeping it as basic as possible and just starting with finding and replacing repeating bytes with an instruction of how many times the following byte is repeated. ie a a a a a = 5 a _ _ _
In order to do this I create a temporary array to write to (initialised to the same size as the input) and then check through for repetitions. If something is repeated more than twice (3+), then a marker byte is put in (I wanted to have specific ones for however many times the byte is repeated - within reason - which is the switch statement below), the next byte is the byte to be repeated and then I want to jump forward to the next different byte.
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This is what I have so far, but it doesn't quite do what I want:
public class Transformer {
byte[] input;
byte[] temp;
byte[] output;
byte rep;
public Transformer() {
public byte[] transform(byte[] in) {
input = in;
temp = new byte[in.length];
output = new byte[count(input, temp)];
output = compress(temp, output);
return output;
private int count(byte[] from, byte[] to) {
int k = 0; // total bytes copied so far
byte markerByte = (byte) 0xE1;
for (int i = 0, j = 0; i < from.length; i = j) {
for (j = i+1; j < from.length && from[j] == from[i] && j-i < 128; j++);
if (j-i >= 3) {
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// (the following method isn't finished)
private byte[] compress(byte[] from, byte[] to) {
for (int i = 0; i < from.length; i++) {
if (from[i] == (byte) 0xE1) {
System.out.println("repeat");
System.out.println(from);
return to;
private byte getRepeatByte(int numberOfRepeats) {
byte instruction;
switch (numberOfRepeats) {
case 1: instruction = (byte) 0xE1; break;
case 2: instruction = (byte) 0xE2; break;
case 3: instruction = (byte) 0xE3; break;
case 4: instruction = (byte) 0xE4; break;
case 5: instruction = (byte) 0xE5; break;
case 6: instruction = (byte) 0xE6; break;
case 7: instruction = (byte) 0xE7; break;
case 8: instruction = (byte) 0xE8; break;
case 9: instruction = (byte) 0xE9; break;
case 10: instruction = (byte) 0xEA; break;
case 11: instruction = (byte) 0xEB; break;
case 12: instruction = (byte) 0xEC; break;
case 13: instruction = (byte) 0xED; break;
case 14: instruction = (byte) 0xEE; break;
case 15: instruction = (byte) 0xEF; break;
default: instruction = (byte) 0xE0; break;
return instruction;
At the moment I'm using a marker byte in the transform() but I want to be using the switch statement to work out the right byte to put in first.
Does anyone have any advice on if I'm doing this in a ridiculous way or if my methods won't work.. As I haven't written a decompressor yet, it's pretty hard to test!baftos - thank you for your advice, i will try that and see how it goes.
Jos - it is your method and thank you very much for it! It's part of an ongoing project of mine, which is turning out to be more challenging than i originally thought - when i posted on the other forum your loop did perfectly what I was trying to do at the time. I need all the advice i can get and hence post on multiple forums. -
Is there a memory limitation to byte arrays?
Everyone,
I have a huge(16MB) CMYK source file and I am trying to convert it to a sRGB /JPEG file and then compress it.
When I try to read that file into a byte array it chokes and throws an OutOfMemoryException. Is there a way around this?
thanks,
Barat.The data looks something like this:
CCCCC...MMMMM...YYYYY...KKKKK...
CCCCC...MMMMM...YYYYY...KKKKK...
where each letter represents one byte.
For example, the first cyan byte has cyan information
for 8 pixels -- each bit represents cyan or no cyan, etc.
The point is to get this data in a viewable form on screen.
Have tried increasing the heap to 256
Of course the problem is in a large array that holds the output information, which is ~130M
The original file size is 16M but this was expanded to eight times the size for the PixelInterleavedSampleModel
where one data element (a byte in this case) represents one sample of a pixel
There must be a better way - any suggestions? -
Hi all,
I'm trying to read in an image and get an int / hex array out of it. Basically, I want to get an array that would look like what you see if you open an image in a hex editor. I have no problems getting a byte array using..
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Reading in any file and converting to a byte array
Okay what I am trying to do is to write a program that will read in any file and convert it into a int array so that I can then manipulate the values of the int array and then re-write the file. Once I get the file into an int array I want to try and compress the data with my own algorithm as well as try to write my own encryption algorithm.
What I have been looking for is code samples that essentially read in the file as a byte array and then I have been trying to convert that byte array into an int array which I could then manipulate. So does anyone have any sample code that essentially takes a file and converts it into an int array and then converts it back into a byte array and write the file. I have found code that is close but I guess I am just too new to this. Any help would be appreciated.You can read a whole file into a byte array like this:File f = new File("somefile");
int size = (int) f.length();
byte[] contents = new byte[size];
DataInputStream in = new DataInputStream(
new BufferedInputStream(new FileInputStream(f)));
in.readFully(contents);
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I'm having a problem with loading an animated GIF int a picturebox control in a C# program after it has been converted to a base64 string, then converted to a byte array, then written to binary, then converted to a base64 string again, then converted to
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ImageAnimator.Animate Method
http://msdn.microsoft.com/en-us/library/system.drawing.imageanimator.animate(v=vs.110).aspx
chanmm
chanmm -
Convert XML data to byte array...
Hello All,
In my application, i have an XML file and the corresponding XSD file. This XML file is having some date, which i want to convert into an byte[] and then save it in a file.
How i can convert the XML data in the byte[]? Here as an example of the xml file and the byte[] data which i want to save in a file.
<?xml version="1.0" encoding="utf-8"?>
<HeadersInfo>
<header>
<id>0</id>
<Name>H1</Name>
</header>
<header>
<id>1</id>
<Name>H2</Name>
</header>
</HeasersInfo>
In the above example 'id' field is of type 'uint' and 'name' field is of type 'string' with max length of '5'. So in this case my byte array should be as shown below:
00 00 00 01 48 31 00 00 00
00 00 00 02 48 32 00 00 00
Here underlines values are for the 'id' parameter where as values in bold are for 'Name' parameter for all the header values in sequence. Name parameter is null (0x00) padded.
Thanks in advance,
IamHuMHi,
the following example extract the id, name values using LINQ To Xml and writes it to a memory stream using a binary writer and returns the result as a byte array:
internal static byte[] GetXmlAsByteArray()
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+ " <header><id>2</id><Name>H2</Name></header>"
// additional testing
+ " <header><id>32767</id><Name>H1234</Name></header>"
+ " <header><id>305419896</id><Name>H56789</Name></header>"
+ "</HeadersInfo>");
const int NameLength = 5; // Max length for a name
byte[] zeroBytes = new byte[NameLength]; // Helper to fill name
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
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foreach (var header in document.Root.Elements("header"))
int id = (int)header.Element("id");
string name = (string)header.Element("Name");
byte[] nameBytes = System.Text.Encoding.UTF8.GetBytes(name);
Console.WriteLine("id: {0}, Name: {1}", id, name);
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writer.Write(GetUIntBytes((uint)id));
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| ((value & 0xff000000) >> 24);
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For a general purpose solution you should create a class and split the example into separate methods to extract the data and write the values (integers, strings).
Regards, Elmar -
Convert byte array to table of int
[http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print|http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print] Hello friends.
I'm pretty new with PL/SQL.
I have code that run well on MSSQL and I want to convert it to PL/SQL with no luck.
The code converts byte array to table of int.
The byte array is actually array of int that was converted to bytes in C# for sending it as parameter.
The TSQL code is:
CREATE FUNCTION dbo.GetTableVarchar(@Data image)
RETURNS @DataTable TABLE (RowID int primary key IDENTITY ,
Value Varchar(8000))
AS
BEGIN
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IF(dbo.ValidateExpectedType(103, @Data)<>1) RETURN
--Loop thru the list inserting each
-- item into the variable table.
DECLARE @Ptr int, @Length int,
@VarcharLength smallint, @Value Varchar(8000)
SELECT @Length = DataLength(@Data), @Ptr = 2
WHILE(@Ptr<@Length)
BEGIN
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SET @VarcharLength = SUBSTRING(@Data, @ptr, 2)
SET @Ptr = @Ptr + 2
IF(@VarcharLength<0)
SET @Value = NULL
ELSE
BEGIN
SET @Value = SUBSTRING(@Data, @ptr, @VarcharLength)
SET @Ptr = @Ptr + @VarcharLength
END
INSERT INTO @DataTable (Value) VALUES(@Value)
END
RETURN
END
It's taken from http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print.
The C# code is:
public byte[] Convert2Bytes(int[] list)
if (list == null || list.Length == 0)
return new byte[0];
byte[] data = new byte[list.Length * 4];
int k = 0;
for (int i = 0; i < list.Length; i++)
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for (int j = intBytes.Length - 1; j >= 0; j--)
data[k++] = intBytes[j];
return data;
I tryied to convert the TSQL code to PL/SQL and thats what I've got:
FUNCTION GetTableInt(p_Data blob)
RETURN t_array --t_array is table of int
AS
l_Ptr number;
l_Length number;
l_ID number;
l_data t_array;
BEGIN
l_Length := dbms_lob.getlength(p_Data);
l_Ptr := 1;
WHILE(l_Ptr<=l_Length)
loop
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
IF(l_ID<-2147483646)THEN
IF(l_ID=-2147483648)THEN
l_ID := NULL;
ELSE
l_Ptr := l_Ptr + 4;
l_ID := to_number( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
END IF;
END IF;
l_data(l_data.count) := l_ID;
l_Ptr := l_Ptr + 4;
END loop;
RETURN l_data;
END GetTableInt;
This isn't work.
This is the error:
Error report:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
06502. 00000 - "PL/SQL: numeric or value error%s"
I think the problem is in this line:
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
but I don't know how to fix that.
Thanks,
MTs.I'd found the solution.
I need to write:
l_ID := utl_raw.cast_to_binary_integer( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
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The performance isn't good, it's take 2.8 sec to convert 5000 int, but it's works. -
Converting ASCII text (byte array ending in null) to a String
Hi all,
I am trying to convert a null terminated ascii string stored in a byte array to a java String. When I pass the byte array to the String constructor it
does not detect/interpret the null as a terminator for the ascii string. Is this something I have to manually program in? ie Check for where the null is and then
pass that subarray of everything before the null to the String constructor?
example of problem
// A B C D null F (note F is junk in the array, and should be ignored since it is after null)
byte[] asciiArray = { 65, 66, 67, 68, 0, 70 };
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//this prints ABCD"sqare icon"FWhy do you expect the null character to terminate the string? If you come from a C or C++ background, you need to understand that java.lang.String is not just a mere character array. It's a full-fledged Java object that knows its length without having any need for null terminator. So Ascii 0 is just another character for String object. To achieve what you want to do, you have to manually loop through the byte array and stop when you encounter a null character.
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How do I read directly from file into byte array
I am reading an image from a file into a BuffertedImage then writing it out again into an array of bytes which I store and use later on in the program. Currently Im doing this in two stages is there a way to do it it one go to speed things up.
try
//Read File Contents into a Buffered Image
/** BUG 4705399: There was a problem with some jpegs taking ages to load turns out to be
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* destination colour model. The side effect should be standard colour model in subsequent reading.
BufferedImage bi = null;
ImageReader ir = null;
ImageInputStream stream = ImageIO.createImageInputStream(new File(path));
final Iterator i = ImageIO.getImageReaders(stream);
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ImageTypeSpecifier typeToUse = null;
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ImageTypeSpecifier type = (ImageTypeSpecifier) i2.next();
if (type.getColorModel().getColorSpace().isCS_sRGB())
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if (typeToUse != null)
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final ImageWriter iw = ImageIO.getImageWriter(ir);
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MainWindow.logger.warning("Warning Unable to Write Image as JPEG");
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This is what my java code looks like:
public class streamedData
protected byte[] m_value = null;
public byte[] getByteArray ()
return m_value;
/* code not pertaining to this question snipped. */
jclass streamedDataClass = env->GetObjectClass(jstreamedData);
// Get methodIDs for the various NPKI_Extension methods
value = env->GetMethodID(streamedDataClass, "getByteArray", "()[B");
lstreamedData->value = (unsigned char *)malloc (lstreamedData->length);
if (lstreamedData->value == NULL)
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This is not working.
My question is, how do I get a copy of or read m_value in the JNI layer? Do I have to make the byte array public and access it as a field ID?
Any help would be appreciated. Why oh why can't there be a CallByteArrayMethod????My question is, how do I get a copy of or read m_value in the JNI layer? Do I have to make the byte array public and access it as a field ID?
You can retrieve a handle to the byte array, through a method call, as you're doing now, or by directly accessing it through GetFieldID.
In the case of the method call, you'll want to do:jmethodID getByteArrayMethod = env->GetMethodID(streamedDataClass, "getByteArray", "()[B");
jbyteArray byteArray = static_cast<jbyteArray>( env->CallObjectMethod( jstreamedData, getByteArrayMethod ) );In the case of field access, you can do:jfieldID m_valueFieldID = env->GetFieldID( streamedDataClass, "m_value", "[B" );
jbyteArray byteArray = static_cast<jbyteArray>( env->GetObjectField( jstreamedData, m_valueFieldID ) );Once you have byteArray, you need to access it using the array operations:lstreamedData->value = env->GetByteArrayElements( byteArray, 0 );
// Do what you want to do, then release the array
env->ReleaseByteArrayElements( byteArray, lstreamedData->value, 0 );As always, Jace, http://jace.reyelts.com/jace, makes this easier. For example,void printByteArray( jobject jstreamedData ) {
streamedData data( jstreamedData );
JArray<JByte> byteArray = streamedData.m_value();
for ( int i = 0; i < byteArray.length(); ++i ) {
cout << byteArray[ i ];
}God bless,
-Toby Reyelts -
How do I store an Int, a short, and multiple bytes from file in byte array
I'm attempting to do this for a project but can't figure out how to store the three values in one byte array. This is what i've tried
public void send(byte[] input)
// TODO
ByteArrayInputStream bais = new ByteArrayInputStream(input);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
byte[] pData = new byte[100];
try {
dos.writeShort(checkSum);
dos.writeInt(nextSeqNum);
pData=baos.toByteArray();
bais.read(pData);
} catch (IOException e) {
DatagramPacket dgp = new DatagramPacket(pData, pData.length);When i set pData=baos.toByteArray() it changes the size and then stops me from being able to read the other 94 bytes into the array to send. Any ideas?You don't need the ByteArrayInputStream at all.
dos.writeShort(checkSum);
dos.writeInt(nextSeqNum);
dos.write(input);
pData = baos.toByteArray();
When i set pData=baos.toByteArray() it changes the sizeNo, it makes it refer to a new byte[] array containing what you've written to the BAOS. That's what it's supposed to do.
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