I am reading dds textures, but since once built the jar I can't access those textures through url and file and have to use InputStream instead.
So I would need to know how I can obtain a java.nio.ByteBuffer from an java.io.InputStream.
Ps: no matter through 3rd part libraries, I just need it working
For me the best in this case is Apache commons-io to handle this and similar tasks.
The IOUtils type has a static method to read an InputStream and return a byte[].
InputStream is;
byte[] bytes = IOUtils.toByteArray(is);
Internally this creates a ByteArrayOutputStream and copies the bytes to the output, then calls toByteArray().
UPDATE: as long as you have the byte array, as @Peter pointed, you have to convert to ByteBuffer
ByteBuffer.wrap(bytes)
JAVA 9 UPDATE: as stated by @saka1029 if you're using java 9+ you can use the default InputStream API which now includes InputStream::readAllBytes function, so no external libraries needed
InputStream is;
byte[] bytes = is.readAllBytes()
ByteBuffer.wrap(bytes)
What is about:
ReadableByteChannel channel = Channels.newChannel(inputStream);
ByteBuffer buffer = ByteBuffer.allocate(bufferSize);
while (channel.read(buffer) != -1) {
//write buffer
};
read() returns -1 when input stream ends? Sometimes it returns 0.
Returns: The number of bytes read, possibly zero, or -1 if the channel has reached end-of-stream
SocketChannel.compact() is for.A neat solution with no 3rd party library needed is
ByteBuffer byteBuffer = ByteBuffer.allocate(inputStream.available());
Channels.newChannel(inputStream).read(byteBuffer);
read() is enough to read all input stream?
InputStream you are using. If it has all the bytes available then it will work.InputStream.available(), and the Javadoc specifically says so. It does not return the total number of bytes in the stream, and may return zero.From Java 9, there is method readAllBytes (in class java.io.InputStream) that returns a byte array. You pass that byte array to [static] method wrap (in class java.nio.ByteBuffer), for example:
public ByteBuffer fromInputStrem(InputStream is) throws IOException {
return ByteBuffer.wrap(is.readAllBytes());
}
