| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.graphics.pdf; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.graphics.Matrix; |
| import android.graphics.Point; |
| import android.graphics.Rect; |
| import android.os.ParcelFileDescriptor; |
| import android.system.ErrnoException; |
| import android.system.OsConstants; |
| import dalvik.system.CloseGuard; |
| import libcore.io.IoUtils; |
| import libcore.io.Libcore; |
| |
| import java.io.IOException; |
| |
| /** |
| * Class for editing PDF files. |
| * |
| * @hide |
| */ |
| public final class PdfEditor { |
| |
| private final CloseGuard mCloseGuard = CloseGuard.get(); |
| |
| private final long mNativeDocument; |
| |
| private int mPageCount; |
| |
| private ParcelFileDescriptor mInput; |
| |
| /** |
| * Creates a new instance. |
| * <p> |
| * <strong>Note:</strong> The provided file descriptor must be <strong>seekable</strong>, |
| * i.e. its data being randomly accessed, e.g. pointing to a file. After finishing |
| * with this class you must call {@link #close()}. |
| * </p> |
| * <p> |
| * <strong>Note:</strong> This class takes ownership of the passed in file descriptor |
| * and is responsible for closing it when the editor is closed. |
| * </p> |
| * |
| * @param input Seekable file descriptor to read from. |
| * |
| * @throws java.io.IOException If an error occurs while reading the file. |
| * @throws java.lang.SecurityException If the file requires a password or |
| * the security scheme is not supported. |
| * |
| * @see #close() |
| */ |
| public PdfEditor(@NonNull ParcelFileDescriptor input) throws IOException { |
| if (input == null) { |
| throw new NullPointerException("input cannot be null"); |
| } |
| |
| final long size; |
| try { |
| Libcore.os.lseek(input.getFileDescriptor(), 0, OsConstants.SEEK_SET); |
| size = Libcore.os.fstat(input.getFileDescriptor()).st_size; |
| } catch (ErrnoException ee) { |
| throw new IllegalArgumentException("file descriptor not seekable"); |
| } |
| |
| mInput = input; |
| mNativeDocument = nativeOpen(mInput.getFd(), size); |
| mPageCount = nativeGetPageCount(mNativeDocument); |
| mCloseGuard.open("close"); |
| } |
| |
| /** |
| * Gets the number of pages in the document. |
| * |
| * @return The page count. |
| */ |
| public int getPageCount() { |
| throwIfClosed(); |
| return mPageCount; |
| } |
| |
| /** |
| * Removes the page with a given index. |
| * |
| * @param pageIndex The page to remove. |
| */ |
| public void removePage(int pageIndex) { |
| throwIfClosed(); |
| throwIfPageNotInDocument(pageIndex); |
| mPageCount = nativeRemovePage(mNativeDocument, pageIndex); |
| } |
| |
| /** |
| * Sets a transformation and clip for a given page. The transformation matrix if |
| * non-null must be affine as per {@link android.graphics.Matrix#isAffine()}. If |
| * the clip is null, then no clipping is performed. |
| * |
| * @param pageIndex The page whose transform to set. |
| * @param transform The transformation to apply. |
| * @param clip The clip to apply. |
| */ |
| public void setTransformAndClip(int pageIndex, @Nullable Matrix transform, |
| @Nullable Rect clip) { |
| throwIfClosed(); |
| throwIfPageNotInDocument(pageIndex); |
| throwIfNotNullAndNotAfine(transform); |
| if (transform == null) { |
| transform = Matrix.IDENTITY_MATRIX; |
| } |
| if (clip == null) { |
| Point size = new Point(); |
| getPageSize(pageIndex, size); |
| nativeSetTransformAndClip(mNativeDocument, pageIndex, transform.native_instance, |
| 0, 0, size.x, size.y); |
| } else { |
| nativeSetTransformAndClip(mNativeDocument, pageIndex, transform.native_instance, |
| clip.left, clip.top, clip.right, clip.bottom); |
| } |
| } |
| |
| /** |
| * Gets the size of a given page in mils (1/72"). |
| * |
| * @param pageIndex The page index. |
| * @param outSize The size output. |
| */ |
| public void getPageSize(int pageIndex, @NonNull Point outSize) { |
| throwIfClosed(); |
| throwIfOutSizeNull(outSize); |
| throwIfPageNotInDocument(pageIndex); |
| nativeGetPageSize(mNativeDocument, pageIndex, outSize); |
| } |
| |
| /** |
| * Gets the media box of a given page in mils (1/72"). |
| * |
| * @param pageIndex The page index. |
| * @param outMediaBox The media box output. |
| */ |
| public boolean getPageMediaBox(int pageIndex, @NonNull Rect outMediaBox) { |
| throwIfClosed(); |
| throwIfOutMediaBoxNull(outMediaBox); |
| throwIfPageNotInDocument(pageIndex); |
| return nativeGetPageMediaBox(mNativeDocument, pageIndex, outMediaBox); |
| } |
| |
| /** |
| * Sets the media box of a given page in mils (1/72"). |
| * |
| * @param pageIndex The page index. |
| * @param mediaBox The media box. |
| */ |
| public void setPageMediaBox(int pageIndex, @NonNull Rect mediaBox) { |
| throwIfClosed(); |
| throwIfMediaBoxNull(mediaBox); |
| throwIfPageNotInDocument(pageIndex); |
| nativeSetPageMediaBox(mNativeDocument, pageIndex, mediaBox); |
| } |
| |
| /** |
| * Gets the crop box of a given page in mils (1/72"). |
| * |
| * @param pageIndex The page index. |
| * @param outCropBox The crop box output. |
| */ |
| public boolean getPageCropBox(int pageIndex, @NonNull Rect outCropBox) { |
| throwIfClosed(); |
| throwIfOutCropBoxNull(outCropBox); |
| throwIfPageNotInDocument(pageIndex); |
| return nativeGetPageCropBox(mNativeDocument, pageIndex, outCropBox); |
| } |
| |
| /** |
| * Sets the crop box of a given page in mils (1/72"). |
| * |
| * @param pageIndex The page index. |
| * @param cropBox The crop box. |
| */ |
| public void setPageCropBox(int pageIndex, @NonNull Rect cropBox) { |
| throwIfClosed(); |
| throwIfCropBoxNull(cropBox); |
| throwIfPageNotInDocument(pageIndex); |
| nativeSetPageCropBox(mNativeDocument, pageIndex, cropBox); |
| } |
| |
| /** |
| * Gets whether the document prefers to be scaled for printing. |
| * |
| * @return Whether to scale the document. |
| */ |
| public boolean shouldScaleForPrinting() { |
| throwIfClosed(); |
| return nativeScaleForPrinting(mNativeDocument); |
| } |
| |
| /** |
| * Writes the PDF file to the provided destination. |
| * <p> |
| * <strong>Note:</strong> This method takes ownership of the passed in file |
| * descriptor and is responsible for closing it when writing completes. |
| * </p> |
| * @param output The destination. |
| */ |
| public void write(ParcelFileDescriptor output) throws IOException { |
| try { |
| throwIfClosed(); |
| nativeWrite(mNativeDocument, output.getFd()); |
| } finally { |
| IoUtils.closeQuietly(output); |
| } |
| } |
| |
| /** |
| * Closes this editor. You should not use this instance |
| * after this method is called. |
| */ |
| public void close() { |
| throwIfClosed(); |
| doClose(); |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| mCloseGuard.warnIfOpen(); |
| if (mInput != null) { |
| doClose(); |
| } |
| } finally { |
| super.finalize(); |
| } |
| } |
| |
| private void doClose() { |
| nativeClose(mNativeDocument); |
| IoUtils.closeQuietly(mInput); |
| mInput = null; |
| mCloseGuard.close(); |
| } |
| |
| private void throwIfClosed() { |
| if (mInput == null) { |
| throw new IllegalStateException("Already closed"); |
| } |
| } |
| |
| private void throwIfPageNotInDocument(int pageIndex) { |
| if (pageIndex < 0 || pageIndex >= mPageCount) { |
| throw new IllegalArgumentException("Invalid page index"); |
| } |
| } |
| |
| private void throwIfNotNullAndNotAfine(Matrix matrix) { |
| if (matrix != null && !matrix.isAffine()) { |
| throw new IllegalStateException("Matrix must be afine"); |
| } |
| } |
| |
| private void throwIfOutSizeNull(Point outSize) { |
| if (outSize == null) { |
| throw new NullPointerException("outSize cannot be null"); |
| } |
| } |
| |
| private void throwIfOutMediaBoxNull(Rect outMediaBox) { |
| if (outMediaBox == null) { |
| throw new NullPointerException("outMediaBox cannot be null"); |
| } |
| } |
| |
| private void throwIfMediaBoxNull(Rect mediaBox) { |
| if (mediaBox == null) { |
| throw new NullPointerException("mediaBox cannot be null"); |
| } |
| } |
| |
| private void throwIfOutCropBoxNull(Rect outCropBox) { |
| if (outCropBox == null) { |
| throw new NullPointerException("outCropBox cannot be null"); |
| } |
| } |
| |
| private void throwIfCropBoxNull(Rect cropBox) { |
| if (cropBox == null) { |
| throw new NullPointerException("cropBox cannot be null"); |
| } |
| } |
| |
| private static native long nativeOpen(int fd, long size); |
| private static native void nativeClose(long documentPtr); |
| private static native int nativeGetPageCount(long documentPtr); |
| private static native int nativeRemovePage(long documentPtr, int pageIndex); |
| private static native void nativeWrite(long documentPtr, int fd); |
| private static native void nativeSetTransformAndClip(long documentPtr, int pageIndex, |
| long transformPtr, int clipLeft, int clipTop, int clipRight, int clipBottom); |
| private static native void nativeGetPageSize(long documentPtr, int pageIndex, Point outSize); |
| private static native boolean nativeGetPageMediaBox(long documentPtr, int pageIndex, |
| Rect outMediaBox); |
| private static native void nativeSetPageMediaBox(long documentPtr, int pageIndex, |
| Rect mediaBox); |
| private static native boolean nativeGetPageCropBox(long documentPtr, int pageIndex, |
| Rect outMediaBox); |
| private static native void nativeSetPageCropBox(long documentPtr, int pageIndex, |
| Rect mediaBox); |
| private static native boolean nativeScaleForPrinting(long documentPtr); |
| } |