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/*
* Copyright 2003 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.aowagie.text.pdf.codec;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import com.aowagie.text.ExceptionConverter;
import com.aowagie.text.Image;
import com.aowagie.text.ImgRaw;
import com.aowagie.text.pdf.PdfArray;
import com.aowagie.text.pdf.PdfDictionary;
import com.aowagie.text.pdf.PdfName;
import com.aowagie.text.pdf.PdfNumber;
import com.aowagie.text.pdf.PdfString;
/** Reads gif images of all types. All the images in a gif are read in the constructors
* and can be retrieved with other methods.
* @author Paulo Soares ([email protected])
*/
public class GifImage {
private DataInputStream in;
private int width; // full image width
private int height; // full image height
private boolean gctFlag; // global color table used
private boolean lctFlag; // local color table flag
private boolean interlace; // interlace flag
private int ix, iy, iw, ih; // current image rectangle
private final byte[] block = new byte[256]; // current data block
private int blockSize = 0; // block size
// last graphic control extension info
private int dispose = 0; // 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
private boolean transparency = false; // use transparent color
private int transIndex; // transparent color index
private static final int MaxStackSize = 4096; // max decoder pixel stack size
// LZW decoder working arrays
private short[] prefix;
private byte[] suffix;
private byte[] pixelStack;
private byte m_out[];
private int m_bpc;
private int m_gbpc;
private byte m_global_table[];
private byte m_curr_table[];
private int m_line_stride;
private byte fromData[];
private URL fromUrl;
private final ArrayList frames = new ArrayList(); // frames read from current file
/** Reads gif images from an URL.
* @param url the URL
* @throws IOException on error
*/
public GifImage(final URL url) throws IOException {
this.fromUrl = url;
InputStream is = null;
try {
is = url.openStream();
process(is);
}
finally {
if (is != null) {
is.close();
}
}
}
/** Reads gif images from a byte array.
* @param data the byte array
* @throws IOException on error
*/
public GifImage(final byte data[]) throws IOException {
this.fromData = data;
InputStream is = null;
try {
is = new ByteArrayInputStream(data);
process(is);
}
finally {
if (is != null) {
is.close();
}
}
}
/** Gets the number of frames the gif has.
* @return the number of frames the gif has
*/
public int getFrameCount() {
return this.frames.size();
}
/** Gets the image from a frame. The first frame is 1.
* @param frame the frame to get the image from
* @return the image
*/
public Image getImage(final int frame) {
final GifFrame gf = (GifFrame)this.frames.get(frame - 1);
return gf.image;
}
/** Gets the logical screen. The images may be smaller and placed
* in some position in this screen to playback some animation.
* No image will be be bigger that this.
* @return the logical screen dimensions as [x,y]
*/
public int[] getLogicalScreen() {
return new int[]{this.width, this.height};
}
private void process(final InputStream is) throws IOException {
this.in = new DataInputStream(new BufferedInputStream(is));
readHeader();
readContents();
if (this.frames.isEmpty()) {
throw new IOException("The file does not contain any valid image.");
}
}
/**
* Reads GIF file header information.
*/
private void readHeader() throws IOException {
String id = "";
for (int i = 0; i < 6; i++) {
id += (char)this.in.read();
}
if (!id.startsWith("GIF8")) {
throw new IOException("Gif signature nor found.");
}
readLSD();
if (this.gctFlag) {
this.m_global_table = readColorTable(this.m_gbpc);
}
}
/**
* Reads Logical Screen Descriptor
*/
private void readLSD() throws IOException {
// logical screen size
this.width = readShort();
this.height = readShort();
// packed fields
final int packed = this.in.read();
this.gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
this.m_gbpc = (packed & 7) + 1;
}
/**
* Reads next 16-bit value, LSB first
*/
private int readShort() throws IOException {
// read 16-bit value, LSB first
return this.in.read() | this.in.read() << 8;
}
/**
* Reads next variable length block from input.
*
* @return number of bytes stored in "buffer"
*/
private int readBlock() throws IOException {
this.blockSize = this.in.read();
if (this.blockSize <= 0) {
return this.blockSize = 0;
}
for (int k = 0; k < this.blockSize; ++k) {
final int v = this.in.read();
if (v < 0) {
return this.blockSize = k;
}
this.block[k] = (byte)v;
}
return this.blockSize;
}
private byte[] readColorTable(int bpc) throws IOException {
final int ncolors = 1 << bpc;
final int nbytes = 3*ncolors;
bpc = newBpc(bpc);
final byte table[] = new byte[(1 << bpc) * 3];
this.in.readFully(table, 0, nbytes);
return table;
}
static private int newBpc(final int bpc) {
switch (bpc) {
case 1:
case 2:
case 4:
break;
case 3:
return 4;
default:
return 8;
}
return bpc;
}
private void readContents() throws IOException {
// read GIF file content blocks
boolean done = false;
while (!done) {
int code = this.in.read();
switch (code) {
case 0x2C: // image separator
readImage();
break;
case 0x21: // extension
code = this.in.read();
switch (code) {
case 0xf9: // graphics control extension
readGraphicControlExt();
break;
case 0xff: // application extension
readBlock();
skip(); // don't care
break;
default: // uninteresting extension
skip();
}
break;
default:
done = true;
break;
}
}
}
/**
* Reads next frame image
*/
private void readImage() throws IOException {
this.ix = readShort(); // (sub)image position & size
this.iy = readShort();
this.iw = readShort();
this.ih = readShort();
final int packed = this.in.read();
this.lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
this.interlace = (packed & 0x40) != 0; // 2 - interlace flag
// 3 - sort flag
// 4-5 - reserved
this.m_bpc = newBpc(this.m_gbpc);
if (this.lctFlag) {
this.m_curr_table = readColorTable((packed & 7) + 1); // read table
this.m_bpc = newBpc((packed & 7) + 1);
}
else {
this.m_curr_table = this.m_global_table;
}
if (this.transparency && this.transIndex >= this.m_curr_table.length / 3) {
this.transparency = false;
}
if (this.transparency && this.m_bpc == 1) { // Acrobat 5.05 doesn't like this combination
final byte tp[] = new byte[12];
System.arraycopy(this.m_curr_table, 0, tp, 0, 6);
this.m_curr_table = tp;
this.m_bpc = 2;
}
final boolean skipZero = decodeImageData(); // decode pixel data
if (!skipZero) {
skip();
}
Image img = null;
try {
img = new ImgRaw(this.iw, this.ih, 1, this.m_bpc, this.m_out);
final PdfArray colorspace = new PdfArray();
colorspace.add(PdfName.INDEXED);
colorspace.add(PdfName.DEVICERGB);
final int len = this.m_curr_table.length;
colorspace.add(new PdfNumber(len / 3 - 1));
colorspace.add(new PdfString(this.m_curr_table));
final PdfDictionary ad = new PdfDictionary();
ad.put(PdfName.COLORSPACE, colorspace);
img.setAdditional(ad);
if (this.transparency) {
img.setTransparency(new int[]{this.transIndex, this.transIndex});
}
}
catch (final Exception e) {
throw new ExceptionConverter(e);
}
img.setOriginalType(Image.ORIGINAL_GIF);
img.setOriginalData(this.fromData);
img.setUrl(this.fromUrl);
final GifFrame gf = new GifFrame();
gf.image = img;
this.frames.add(gf); // add image to frame list
//resetFrame();
}
private boolean decodeImageData() throws IOException {
final int NullCode = -1;
final int npix = this.iw * this.ih;
int available, clear, code_mask, code_size, end_of_information, in_code, old_code,
bits, code, count, i, datum, data_size, first, top, bi;
boolean skipZero = false;
if (this.prefix == null) {
this.prefix = new short[MaxStackSize];
}
if (this.suffix == null) {
this.suffix = new byte[MaxStackSize];
}
if (this.pixelStack == null) {
this.pixelStack = new byte[MaxStackSize+1];
}
this.m_line_stride = (this.iw * this.m_bpc + 7) / 8;
this.m_out = new byte[this.m_line_stride * this.ih];
int pass = 1;
int inc = this.interlace ? 8 : 1;
int line = 0;
int xpos = 0;
// Initialize GIF data stream decoder.
data_size = this.in.read();
clear = 1 << data_size;
end_of_information = clear + 1;
available = clear + 2;
old_code = NullCode;
code_size = data_size + 1;
code_mask = (1 << code_size) - 1;
for (code = 0; code < clear; code++) {
this.prefix[code] = 0;
this.suffix[code] = (byte) code;
}
// Decode GIF pixel stream.
datum = bits = count = first = top = bi = 0;
for (i = 0; i < npix; ) {
if (top == 0) {
if (bits < code_size) {
// Load bytes until there are enough bits for a code.
if (count == 0) {
// Read a new data block.
count = readBlock();
if (count <= 0) {
skipZero = true;
break;
}
bi = 0;
}
datum += (this.block[bi] & 0xff) << bits;
bits += 8;
bi++;
count--;
continue;
}
// Get the next code.
code = datum & code_mask;
datum >>= code_size;
bits -= code_size;
// Interpret the code
if (code > available || code == end_of_information) {
break;
}
if (code == clear) {
// Reset decoder.
code_size = data_size + 1;
code_mask = (1 << code_size) - 1;
available = clear + 2;
old_code = NullCode;
continue;
}
if (old_code == NullCode) {
this.pixelStack[top++] = this.suffix[code];
old_code = code;
first = code;
continue;
}
in_code = code;
if (code == available) {
this.pixelStack[top++] = (byte) first;
code = old_code;
}
while (code > clear) {
this.pixelStack[top++] = this.suffix[code];
code = this.prefix[code];
}
first = this.suffix[code] & 0xff;
// Add a new string to the string table,
if (available >= MaxStackSize) {
break;
}
this.pixelStack[top++] = (byte) first;
this.prefix[available] = (short) old_code;
this.suffix[available] = (byte) first;
available++;
if ((available & code_mask) == 0 && available < MaxStackSize) {
code_size++;
code_mask += available;
}
old_code = in_code;
}
// Pop a pixel off the pixel stack.
top--;
i++;
setPixel(xpos, line, this.pixelStack[top]);
++xpos;
if (xpos >= this.iw) {
xpos = 0;
line += inc;
if (line >= this.ih) {
if (this.interlace) {
do {
pass++;
switch (pass) {
case 2:
line = 4;
break;
case 3:
line = 2;
inc = 4;
break;
case 4:
line = 1;
inc = 2;
break;
default: // this shouldn't happen
line = this.ih - 1;
inc = 0;
}
} while (line >= this.ih);
}
else {
line = this.ih - 1; // this shouldn't happen
inc = 0;
}
}
}
}
return skipZero;
}
private void setPixel(final int x, final int y, final int v) {
if (this.m_bpc == 8) {
final int pos = x + this.iw * y;
this.m_out[pos] = (byte)v;
}
else {
final int pos = this.m_line_stride * y + x / (8 / this.m_bpc);
final int vout = v << 8 - this.m_bpc * (x % (8 / this.m_bpc))- this.m_bpc;
this.m_out[pos] |= vout;
}
}
/**
* Reads Graphics Control Extension values
*/
private void readGraphicControlExt() throws IOException {
this.in.read(); // block size
final int packed = this.in.read(); // packed fields
this.dispose = (packed & 0x1c) >> 2; // disposal method
if (this.dispose == 0)
{
this.dispose = 1; // elect to keep old image if discretionary
}
this.transparency = (packed & 1) != 0;
this.transIndex = this.in.read(); // transparent color index
this.in.read(); // block terminator
}
/**
* Skips variable length blocks up to and including
* next zero length block.
*/
private void skip() throws IOException {
do {
readBlock();
} while (this.blockSize > 0);
}
private static class GifFrame {
private Image image;
}
}
