src/main/java/org/nustaq/serialization/coders/FSTStreamDecoder.java
@Override
    public Object readFPrimitiveArray(Object array, Class componentType, int len) {
        try {
            if (componentType == byte.class) {
                byte[] arr = (byte[]) array;
                ensureReadAhead(arr.length); // fixme: move this stuff to the stream !
                System.arraycopy(input.buf,input.pos,arr,0,len);
                input.pos += len;
                return arr;
            } else if (componentType == int.class) {
                final int[] arr = (int[]) array;
                readFIntArr(len, arr);
                return arr;
            } else if (componentType == long.class) {
                long[] arr = (long[]) array;
                readFLongArr(len, arr);
                return arr;
            } else if (componentType == char.class) {
                char[] arr = (char[]) array;
                for (int j = 0; j < len; j++) {
                    arr[j] = readFChar();
                }
                return arr;
            } else if (componentType == double.class) {
                double[] arr = (double[]) array;
                ensureReadAhead(arr.length * 8);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFDouble();
                }
                return arr;
            } else if (componentType == short.class) {
                short[] arr = (short[]) array;
                ensureReadAhead(arr.length * 2);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFShort();
                }
                return arr;
            } else if (componentType == float.class) {
                float[] arr = (float[]) array;
                ensureReadAhead(arr.length * 4);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFFloat();
                }
                return arr;
            } else if (componentType == boolean.class) {
                boolean[] arr = (boolean[]) array;
                ensureReadAhead(arr.length);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFByte() == 0 ? false : true;
                }
                return arr;
            } else {
                throw new RuntimeException("unexpected primitive type " + componentType.getName());
            }
        } catch (IOException e) {
            LOGGER.log(FSTLogger.Level.ERROR, "Failed to read primitive array", e);
            FSTUtil.<RuntimeException>rethrow(e);
        }
        return null;
    }
@Override
    public Object readFPrimitiveArray(Object array, Class componentType, int len) {
        try {
            if (componentType == byte.class) {
                byte[] arr = (byte[]) array;
                ensureReadAhead(arr.length); // fixme: move this stuff to the stream !
                System.arraycopy(input.buf,input.pos,arr,0,len);
                input.pos += len;
                return arr;
            } else if (componentType == int.class) {
                final int[] arr = (int[]) array;
                readFIntArr(len, arr);
                return arr;
            } else if (componentType == long.class) {
                long[] arr = (long[]) array;
                readFLongArr(len, arr);
                return arr;
            } else if (componentType == char.class) {
                char[] arr = (char[]) array;
                for (int j = 0; j < len; j++) {
                    arr[j] = readFChar();
                }
                return arr;
            } else if (componentType == double.class) {
                double[] arr = (double[]) array;
                ensureReadAhead(arr.length * 8);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFDouble();
                }
                return arr;
            } else if (componentType == short.class) {
                short[] arr = (short[]) array;
                ensureReadAhead(arr.length * 2);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFShort();
                }
                return arr;
            } else if (componentType == float.class) {
                float[] arr = (float[]) array;
                ensureReadAhead(arr.length * 4);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFFloat();
                }
                return arr;
            } else if (componentType == boolean.class) {
                boolean[] arr = (boolean[]) array;
                ensureReadAhead(arr.length);
                for (int j = 0; j < len; j++) {
                    arr[j] = readFByte() == 0 ? false : true;
                }
                return arr;
            } else {
                throw new RuntimeException("unexpected primitive type " + componentType.getName());
            }
        } catch (IOException e) {
            LOGGER.log(FSTLogger.Level.ERROR, "Failed to read primitive array", e);
            FSTUtil.<RuntimeException>rethrow(e);
        }
        return null;
    }
assumes class header+len already read

@param componentType
@param len
@return