Example usage for java.nio ByteBuffer allocate

List of usage examples for java.nio ByteBuffer allocate

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Introduction

In this page you can find the example usage for java.nio ByteBuffer allocate.

Prototype

public static ByteBuffer allocate(int capacity)

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

From source file:haxball.util.Serializer.java

public static byte[] intToByteArray(int value) {
    return ByteBuffer.allocate(4).putInt(value).array();
}

From source file:com.oneguy.recognize.Util.java

public static ByteBuffer doubleSize(ByteBuffer buffer) {
    if (buffer == null) {
        return null;
    }//from  ww w .j ava 2s  .c om
    byte[] content = new byte[buffer.position()];
    buffer.flip();
    buffer.get(content);
    ByteBuffer newBuffer = ByteBuffer.allocate(buffer.capacity() * 2);
    newBuffer.put(content);
    return newBuffer;
}

From source file:Main.java

/**
 * Decode/unescape a portion of a URL, to use with the query part ensure {@code plusAsBlank} is true.
 *
 * @param content     the portion to decode
 * @param charset     the charset to use
 * @param plusAsBlank if {@code true}, then convert '+' to space (e.g. for www-url-form-encoded content), otherwise leave as is.
 * @return encoded string//from w w w  .j a v  a 2  s .  co  m
 */
private static String urldecode(final String content, final Charset charset, final boolean plusAsBlank) {
    if (content == null) {
        return null;
    }
    ByteBuffer bb = ByteBuffer.allocate(content.length());
    CharBuffer cb = CharBuffer.wrap(content);
    while (cb.hasRemaining()) {
        char c = cb.get();
        if (c == '%' && cb.remaining() >= 2) {
            char uc = cb.get();
            char lc = cb.get();
            int u = Character.digit(uc, 16);
            int l = Character.digit(lc, 16);
            if (u != -1 && l != -1) {
                bb.put((byte) ((u << 4) + l));
            } else {
                bb.put((byte) '%');
                bb.put((byte) uc);
                bb.put((byte) lc);
            }
        } else if (plusAsBlank && c == '+') {
            bb.put((byte) ' ');
        } else {
            bb.put((byte) c);
        }
    }
    bb.flip();
    return charset.decode(bb).toString();
}

From source file:haxball.util.Serializer.java

public static byte[] floatToByteArray(float value) {
    return ByteBuffer.allocate(4).putFloat(value).array();
}

From source file:com.astamuse.asta4d.web.util.SecureIdGenerator.java

public static String createEncryptedURLSafeId() {
    try {/*w ww  .  j  a  v  a  2 s . com*/
        byte[] idBytes = IdGenerator.createIdBytes();

        ByteBuffer bb = ByteBuffer.allocate(idBytes.length + 4);
        bb.put(idBytes);

        // add random salt
        bb.putInt(sr.nextInt());

        MessageDigest crypt = MessageDigest.getInstance("SHA-1");
        return Base64.encodeBase64URLSafeString(crypt.digest(bb.array()));

    } catch (NoSuchAlgorithmException e) {
        // impossible
        throw new RuntimeException(e);
    }
}

From source file:com.smartitengineering.cms.api.impl.Utils.java

public static String readStringInUTF8(DataInput in) throws IOException, UnsupportedEncodingException {
    int allocationBlockSize = 2000;
    int capacity = allocationBlockSize;
    int length = 0;
    ByteBuffer buffer = ByteBuffer.allocate(allocationBlockSize);
    boolean notEof = true;
    while (notEof) {
        try {/*from w ww .  j  a v  a2  s.  c  o  m*/
            buffer.put(in.readByte());
            if (++length >= capacity) {
                capacity += allocationBlockSize;
                buffer.limit(capacity);
            }
        } catch (EOFException ex) {
            notEof = false;
        }
    }
    String string = StringUtils.newStringUtf8(Arrays.copyOf(buffer.array(), length));
    return string;
}

From source file:Main.java

/**
 * /*from   w  w  w. j a  v  a 2  s . c o m*/
 * @return Bitmap's RGBA byte array
 */
public static byte[] getImageRGBA(Bitmap inputBitmap) {
    Config config = inputBitmap.getConfig();
    ByteBuffer buffer;

    Bitmap bitmap;
    /**
     * if bitmap size is not 32*32 create scaled bitmap
     */

    if (inputBitmap.getWidth() != 32 || inputBitmap.getHeight() != 32) {
        Log.d(TAG, "bitmap resized to 32x32");
        bitmap = Bitmap.createScaledBitmap(inputBitmap, 32, 32, false);
    } else {
        bitmap = inputBitmap;
    }
    /**
     * if bitmap is not ARGB_8888 format, copy bitmap with ARGB_8888 format
     */
    if (!config.equals(Bitmap.Config.ARGB_8888)) {
        Bitmap bitmapARBG = bitmap.copy(Bitmap.Config.ARGB_8888, false);
        buffer = ByteBuffer.allocate(bitmapARBG.getByteCount());
        bitmapARBG.copyPixelsToBuffer(buffer);
        bitmapARBG.recycle();
    } else {
        buffer = ByteBuffer.allocate(bitmap.getByteCount());
        bitmap.copyPixelsToBuffer(buffer);
    }
    return buffer.array();
}

From source file:Main.java

/**
 * NOTE: Arithmetic operations in primitive types may lead to arithmetic overflow. To retain
 * precision, BigDecimal objects are used.
 *
 * @param rgb/*  w ww  .  j  av  a 2s  .c om*/
 * @return
 */
public static int[] convertRGB_8_8_8_To_HSB_32_32_32(int[] rgb) {
    int[] hsb = new int[3];
    int maxChroma = Math.max(Math.max(rgb[0], rgb[1]), rgb[2]);
    int minChroma = Math.min(Math.min(rgb[0], rgb[1]), rgb[2]);
    int diff = maxChroma - minChroma;

    // Hue
    BigDecimal hue;
    if (diff == 0) {
        hue = BigDecimal.ZERO;
    } else if (maxChroma == rgb[0]) {
        float tmp = (rgb[1] - rgb[2]) / (float) diff;
        if (tmp < 0) {
            tmp += 6 * Math.ceil(-tmp / 6.0);
        } else {
            tmp -= 6 * Math.floor(tmp / 6.0);
        }
        hue = BigDecimal.valueOf(tmp);
    } else if (maxChroma == rgb[1]) {
        hue = BigDecimal.valueOf((rgb[2] - rgb[0]) / (float) diff + 2);
    } else {
        hue = BigDecimal.valueOf((rgb[0] - rgb[1]) / (float) diff + 4);
    }
    // [0, 360] -> [0, 0xffffffff]
    hue = hue.multiply(BigDecimal.valueOf(0xffffffffL));
    hue = hue.divide(BigDecimal.valueOf(6), RoundingMode.FLOOR);
    hsb[0] = ByteBuffer.allocate(8).putLong(hue.longValue()).getInt(4);

    // Saturation
    if (maxChroma == 0) {
        hsb[1] = 0;
    } else {
        // [0, 1] -> [0, 0xffffffff]
        BigDecimal sat = BigDecimal.valueOf(diff);
        sat = sat.multiply(BigDecimal.valueOf(0xffffffffL));
        sat = sat.divide(BigDecimal.valueOf(maxChroma), RoundingMode.FLOOR);
        hsb[1] = ByteBuffer.allocate(8).putLong(sat.longValue()).getInt(4);
    }

    // Brightness
    // [0, 255] -> [0, 0xffffffff]
    BigDecimal brightness = BigDecimal.valueOf(maxChroma);
    brightness = brightness.multiply(BigDecimal.valueOf(0xffffffffL));
    brightness = brightness.divide(BigDecimal.valueOf(0xffL), RoundingMode.FLOOR);
    hsb[2] = ByteBuffer.allocate(8).putLong(brightness.longValue()).getInt(4);

    return hsb;
}

From source file:Main.java

public final static ByteBuffer borrowByteBufferSmall() {
    if (byteBuffersPoolSmall.isEmpty()) {
        return ByteBuffer.allocate(MAX_LINE_BYTES_SMALL);
    } else {/*from www.  j av  a 2s  . c o m*/
        return byteBuffersPoolSmall.remove(0);
    }
}

From source file:Main.java

public final static ByteBuffer borrowByteBufferLarge() {
    if (byteBuffersPoolLarge.isEmpty()) {
        return ByteBuffer.allocate(MAX_LINE_BYTES_LARGE);
    } else {/*from  w w  w  . j ava  2 s . c  om*/
        return byteBuffersPoolLarge.remove(0);
    }
}