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src/main/java/at/dhyan/open_imaging/GifDecoder.java
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package at.dhyan.open_imaging;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import static java.lang.System.arraycopy;
/*
* Copyright 2014 Dhyan Blum
*
* 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.
*/
/**
* <p>
* A decoder capable of processing a GIF data stream to render the graphics
* contained in it. This implementation follows the official
* <A HREF="http://www.w3.org/Graphics/GIF/spec-gif89a.txt">GIF
* specification</A>.
* </p>
*
* <p>
* Example usage:
* </p>
*
* <p>
*
* <pre>
* final GifImage gifImage = GifDecoder.read(int[] data);
* final int width = gifImage.getWidth();
* final int height = gifImage.getHeight();
* final int frameCount = gifImage.getFrameCount();
* for (int i = 0; i < frameCount; i++) {
* final BufferedImage image = gifImage.getFrame(i);
* final int delay = gif.getDelay(i);
* }
* </pre>
*
* </p>
*
* @author Dhyan Blum
* @version 1.09 November 2017
*/
public final class GifDecoder {
static final class BitReader {
private int nextBitToRead;
private int numberOfBitsToRead;
private int bitMask; // Used to kill unwanted higher bits
private byte[] bytes; // Data array
// To avoid costly bounds checks, 'in' needs 2 more 0-bytes at the end
private void init(final byte[] bytes) {
this.bytes = bytes;
nextBitToRead = 0;
}
private int read() {
// Byte indices: (bitPos / 8), (bitPos / 8) + 1, (bitPos / 8) + 2
int byteIndex = nextBitToRead >>> 3; // Byte = bit / 8
int bitsToShiftRight = nextBitToRead & 7; // & 7 is the same as MODULO 8
int byte0, byte1, byte2;
byte0 = bytes[byteIndex++] & 0xFF; // & 0xFF gives us the unsigned values
byte1 = bytes[byteIndex++] & 0xFF;
byte2 = bytes[byteIndex] & 0xFF;
// Glue the bytes together, don't do more shifting than necessary
int buffer = ((byte2 << 8 | byte1) << 8 | byte0) >>> bitsToShiftRight;
nextBitToRead += numberOfBitsToRead;
return buffer & bitMask; // Kill the unwanted higher bits
}
private void setNumberOfBitsToRead(final int numberOfBitsToRead) {
this.numberOfBitsToRead = numberOfBitsToRead;
bitMask = (1 << numberOfBitsToRead) - 1;
}
}
static final class CodeTable {
private final int[][] table; // Maps codes to lists of colors
private int initTableSize; // Number of colors +2 for CLEAR + EOI
private int initCodeSize; // Initial code size
private int initCodeLimit; // First code limit
private int codeSize; // Current code size, maximum is 12 bits
private int nextCode; // Next available code for a new entry
private int nextCodeLimit; // Increase codeSize when nextCode == limit
private BitReader bitReader; // Notify when code sizes increases
public CodeTable() {
table = new int[4096][1];
}
private int add(final int[] indices) {
if (nextCode < 4096) {
if (nextCode == nextCodeLimit && codeSize < 12) {
codeSize++; // Max code size is 12
bitReader.setNumberOfBitsToRead(codeSize);
nextCodeLimit = (1 << codeSize) - 1; // 2^codeSize - 1
}
table[nextCode++] = indices;
}
return codeSize;
}
private int clear() {
codeSize = initCodeSize;
bitReader.setNumberOfBitsToRead(codeSize);
nextCodeLimit = initCodeLimit;
nextCode = initTableSize; // Don't recreate table, reset pointer
return codeSize;
}
private void init(final GifFrame fr, final int[] activeColTbl, final BitReader br) {
this.bitReader = br;
final int numColors = activeColTbl.length;
initCodeSize = fr.firstCodeSize;
initCodeLimit = (1 << initCodeSize) - 1; // 2^initCodeSize - 1
initTableSize = fr.endOfInfoCode + 1;
nextCode = initTableSize;
for (int c = numColors - 1; c >= 0; c--) {
table[c][0] = activeColTbl[c]; // Translated color
} // A gap may follow with no colors assigned if numCols < CLEAR
table[fr.clearCode] = new int[]{fr.clearCode}; // CLEAR
table[fr.endOfInfoCode] = new int[]{fr.endOfInfoCode}; // EOI
// Locate transparent color in code table and set to 0
if (fr.transpColFlag && fr.transpColIndex < numColors) {
table[fr.transpColIndex][0] = 0;
}
}
}
final class GifFrame {
// Graphic control extension (optional)
// Disposal: 0=NO_ACTION, 1=NO_DISPOSAL, 2=RESTORE_BG, 3=RESTORE_PREV
private int disposalMethod; // 0-3 as above, 4-7 undefined
private boolean transpColFlag; // 1 Bit
private int delay; // Unsigned, LSByte first, n * 1/100 * s
private int transpColIndex; // 1 Byte
// Image descriptor
private int x; // Position on the canvas from the left
private int y; // Position on the canvas from the top
private int w; // May be smaller than the base image
private int h; // May be smaller than the base image
private int wh; // width * height
private boolean hasLocColTbl; // Has local color table? 1 Bit
private boolean interlaceFlag; // Is an interlace image? 1 Bit
@SuppressWarnings("unused")
private boolean sortFlag; // True if local colors are sorted, 1 Bit
private int sizeOfLocColTbl; // Size of the local color table, 3 Bits
private int[] localColTbl; // Local color table (optional)
// Image data
private int firstCodeSize; // LZW minimum code size + 1 for CLEAR & EOI
private int clearCode;
private int endOfInfoCode;
private byte[] data; // Holds LZW encoded data
private BufferedImage img; // Full drawn image, not just the frame area
}
public final class GifImage {
public String header; // Bytes 0-5, GIF87a or GIF89a
private int w; // Unsigned 16 Bit, the least significant byte first
private int h; // Unsigned 16 Bit, the least significant byte first
private int wh; // Image width * image height
public boolean hasGlobColTbl; // 1 Bit
public int colorResolution; // 3 Bits
public boolean sortFlag; // True if global colors are sorted, 1 Bit
public int sizeOfGlobColTbl; // 2^(val(3 Bits) + 1), see spec
public int bgColIndex; // Background color index, 1 Byte
public int pxAspectRatio; // Pixel aspect ratio, 1 Byte
public int[] globalColTbl; // Global color table
private final List<GifFrame> frames = new ArrayList<GifFrame>(64);
public String appId = ""; // 8 Bytes at in[i+3], usually "NETSCAPE"
public String appAuthCode = ""; // 3 Bytes at in[i+11], usually "2.0"
public int repetitions = 0; // 0: infinite loop, N: number of loops
private BufferedImage img = null; // Currently, drawn frame
private final BitReader bits = new BitReader();
private final CodeTable codes = new CodeTable();
private Graphics2D g;
private int[] decode(final GifFrame fr, final int[] activeColTbl) {
codes.init(fr, activeColTbl, bits);
bits.init(fr.data); // Incoming codes
final int clearCode = fr.clearCode, endCode = fr.endOfInfoCode;
final int[] out = new int[wh]; // Target image pixel array
final int[][] tbl = codes.table; // Code table
int outPos = 0; // Next pixel position in the output image array
codes.clear(); // Init code table
bits.read(); // Skip leading clear code
int code = bits.read(); // Read first code
int[] pixels = tbl[code]; // Output pixel for first code
arraycopy(pixels, 0, out, outPos, pixels.length);
outPos += pixels.length;
try {
while (true) {
final int prevCode = code;
code = bits.read(); // Get next code in stream
if (code == clearCode) { // After a CLEAR table, there is
codes.clear(); // no previous code, we need to read
code = bits.read(); // a new one
pixels = tbl[code]; // Output pixels
arraycopy(pixels, 0, out, outPos, pixels.length);
outPos += pixels.length;
continue; // Back to the loop with a valid previous code
} else if (code == endCode) {
break;
}
final int[] prevVals = tbl[prevCode];
final int[] prevValsAndK = new int[prevVals.length + 1];
arraycopy(prevVals, 0, prevValsAndK, 0, prevVals.length);
if (code < codes.nextCode) { // Code table contains code
pixels = tbl[code]; // Output pixels
arraycopy(pixels, 0, out, outPos, pixels.length);
outPos += pixels.length;
prevValsAndK[prevVals.length] = tbl[code][0]; // K
} else {
prevValsAndK[prevVals.length] = prevVals[0]; // K
arraycopy(prevValsAndK, 0, out, outPos, prevValsAndK.length);
outPos += prevValsAndK.length;
}
codes.add(prevValsAndK); // Previous indices + K
}
} catch (final ArrayIndexOutOfBoundsException ignored) {
}
return out;
}
private int[] deinterlace(final int[] src, final GifFrame fr) {
final int w = fr.w, h = fr.h, wh = fr.wh;
final int[] dest = new int[src.length];
// Interlaced images are organized in 4 sets of pixel lines
final int set2Y = (h + 7) >>> 3; // Line no. = ceil(h/8.0)
final int set3Y = set2Y + ((h + 3) >>> 3); // ceil(h-4/8.0)
final int set4Y = set3Y + ((h + 1) >>> 2); // ceil(h-2/4.0)
// Sets' start indices in source array
final int set2 = w * set2Y, set3 = w * set3Y, set4 = w * set4Y;
// Line skips in destination array
final int w2 = w << 1, w4 = w2 << 1, w8 = w4 << 1;
// Group 1 contains every 8th line starting from 0
int from = 0, to = 0;
for (; from < set2; from += w, to += w8) {
arraycopy(src, from, dest, to, w);
} // Group 2 contains every 8th line starting from 4
for (to = w4; from < set3; from += w, to += w8) {
arraycopy(src, from, dest, to, w);
} // Group 3 contains every 4th line starting from 2
for (to = w2; from < set4; from += w, to += w4) {
arraycopy(src, from, dest, to, w);
} // Group 4 contains every 2nd line starting from 1 (biggest group)
for (to = w; from < wh; from += w, to += w2) {
arraycopy(src, from, dest, to, w);
}
return dest; // All pixel lines have now been rearranged
}
private void drawFrame(final GifFrame fr) {
// Determine the color table that will be active for this frame
final int[] activeColTbl = fr.hasLocColTbl ? fr.localColTbl : globalColTbl;
// Get pixels from data stream
int[] pixels = decode(fr, activeColTbl);
if (fr.interlaceFlag) {
pixels = deinterlace(pixels, fr); // Rearrange pixel lines
}
// Create image of type 2=ARGB for frame area
final BufferedImage frame = new BufferedImage(fr.w, fr.h, 2);
arraycopy(pixels, 0, ((DataBufferInt) frame.getRaster().getDataBuffer()).getData(), 0, fr.wh);
// Draw frame area on top of working image
g.drawImage(frame, fr.x, fr.y, null);
// Visualize frame boundaries during testing
// if (DEBUG_MODE) {
// if (prev != null) {
// g.setColor(Color.RED); // Previous frame color
// g.drawRect(prev.x, prev.y, prev.w - 1, prev.h - 1);
// }
// g.setColor(Color.GREEN); // New frame color
// g.drawRect(fr.x, fr.y, fr.w - 1, fr.h - 1);
// }
// Keep a copy of the previous frame's pixels in case we need to restore the frame
int[] prevPx = new int[wh];
arraycopy(((DataBufferInt) img.getRaster().getDataBuffer()).getData(), 0, prevPx, 0, wh);
// Create another copy for the end user to not expose internal state
fr.img = new BufferedImage(w, h, 2); // 2 = ARGB
arraycopy(prevPx, 0, ((DataBufferInt) fr.img.getRaster().getDataBuffer()).getData(), 0, wh);
// Handle disposal of current frame
if (fr.disposalMethod == 2) {
// Restore to background color (clear frame area only)
g.clearRect(fr.x, fr.y, fr.w, fr.h);
} else if (fr.disposalMethod == 3) {
// Restore previous frame
arraycopy(prevPx, 0, ((DataBufferInt) img.getRaster().getDataBuffer()).getData(), 0, wh);
}
}
/**
* Returns the background color of the first frame in this GIF image. If
* the frame has a local color table, the returned color will be from
* that table. If not, the color will be from the global color table.
* Returns 0 if there is neither a local nor a global color table.
*
* @return 32 bit ARGB color in the form 0xAARRGGBB
*/
public final int getBackgroundColor() {
final GifFrame frame = frames.get(0);
if (frame.hasLocColTbl) {
return frame.localColTbl[bgColIndex];
} else if (hasGlobColTbl) {
return globalColTbl[bgColIndex];
}
return 0;
}
/**
* If not 0, the delay specifies how many hundredths (1/100) of a second
* to wait before displaying the frame <i>after</i> the current frame.
*
* @param index Index of the current frame, 0 to N-1
* @return Delay as number of hundredths (1/100) of a second
*/
public final int getDelay(final int index) {
return frames.get(index).delay;
}
/**
* @param index Index of the frame to return as image, starting from 0.
* For incremental calls such as [0, 1, 2, ...] the method's
* run time is O(1) as only one frame is drawn per call. For
* random access calls such as [7, 12, ...] the run time is
* O(N+1) with N being the number of previous frames that
* need to be drawn before N+1 can be drawn on top. Once a
* frame has been drawn it is being cached and the run time
* is more or less O(0) to retrieve it from the list.
* @return A BufferedImage for the specified frame.
*/
public BufferedImage getFrame(final int index) {
if (img == null) { // Init
img = new BufferedImage(w, h, 2); // 2 = ARGB
g = img.createGraphics();
g.setBackground(new Color(0, true)); // Transparent color
}
GifFrame fr = frames.get(index);
if (fr.img == null) {
// Draw all frames until and including the requested frame
for (int i = 0; i <= index; i++) {
fr = frames.get(i);
if (fr.img == null) {
drawFrame(fr);
}
}
}
return fr.img;
}
/**
* @return The number of frames contained in this GIF image
*/
public final int getFrameCount() {
return frames.size();
}
/**
* @return The height of the GIF image
*/
public final int getHeight() {
return h;
}
/**
* @return The width of the GIF image
*/
public final int getWidth() {
return w;
}
}
static final boolean DEBUG_MODE = false;
/**
* @param in Raw image data as a byte[] array
* @return A GifImage object exposing the properties of the GIF image.
* @throws IOException If the image violates the GIF specification or is truncated.
*/
public static GifImage read(final byte[] in) throws IOException {
final GifDecoder decoder = new GifDecoder();
final GifImage img = decoder.new GifImage();
GifFrame frame = null; // Currently open frame
int pos = readHeader(in, img); // Read header, get next byte position
pos = readLogicalScreenDescriptor(img, in, pos);
if (img.hasGlobColTbl) {
img.globalColTbl = new int[img.sizeOfGlobColTbl];
pos = readColTbl(in, img.globalColTbl, pos);
}
while (pos < in.length) {
final int block = in[pos] & 0xFF;
switch (block) {
case 0x21: // Extension introducer
if (pos + 1 >= in.length) {
throw new IOException("Unexpected end of file.");
}
switch (in[pos + 1] & 0xFF) {
case 0xFE: // Comment extension
pos = readTextExtension(in, pos);
break;
case 0xFF: // Application extension
pos = readAppExt(img, in, pos);
break;
case 0x01: // Plain text extension
frame = null; // End of current frame
pos = readTextExtension(in, pos);
break;
case 0xF9: // Graphic control extension
if (frame == null) {
frame = decoder.new GifFrame();
img.frames.add(frame);
}
pos = readGraphicControlExt(frame, in, pos);
break;
default:
throw new IOException("Unknown extension at " + pos);
}
break;
case 0x2C: // Image descriptor
if (frame == null) {
frame = decoder.new GifFrame();
img.frames.add(frame);
}
pos = readImgDescr(frame, in, pos);
if (frame.hasLocColTbl) {
frame.localColTbl = new int[frame.sizeOfLocColTbl];
pos = readColTbl(in, frame.localColTbl, pos);
}
pos = readImgData(frame, in, pos);
frame = null; // End of current frame
break;
case 0x3B: // GIF Trailer
return img; // Found trailer, finished reading.
default:
// Unknown block. The image is corrupted. Strategies: a) Skip
// and wait for a valid block. Experience: It'll get worse. b)
// Throw exception. c) Return gracefully if we are almost done
// processing. The frames we have so far should be error-free.
final double progress = 1.0 * pos / in.length;
if (progress < 0.9) {
throw new IOException("Unknown block at: " + pos);
}
pos = in.length; // Exit loop
}
}
return img;
}
/**
* @param is Image data as input stream. This method will read from the
* input stream's current position. It will not reset the
* position before reading and won't reset or close the stream
* afterwards. Call these methods before and after calling this
* method as needed.
* @return A GifImage object exposing the properties of the GIF image.
* @throws IOException If an I/O error occurs, the image violates the GIF
* specification or the GIF is truncated.
*/
public static GifImage read(final InputStream is) throws IOException {
final byte[] data = new byte[is.available()];
is.read(data, 0, data.length);
return read(data);
}
/**
* @param img GIF image
* @param in Raw data
* @param i Index of the first byte of the application extension
* @return Index of the first byte after this extension
*/
static int readAppExt(final GifImage img, final byte[] in, int i) {
img.appId = new String(in, i + 3, 8); // should be "NETSCAPE"
img.appAuthCode = new String(in, i + 11, 3); // should be "2.0"
i += 14; // Go to sub-block size, it's value should be 3
final int subBlockSize = in[i] & 0xFF;
// The only app extension widely used is NETSCAPE, it's got 3 data bytes
if (subBlockSize == 3) {
// in[i+1] should have value 01, in[i+5] should be block terminator
img.repetitions = in[i + 2] & 0xFF | in[i + 3] & 0xFF << 8; // Short
return i + 5;
} // Skip unknown application extensions
while ((in[i] & 0xFF) != 0) { // While sub-block size != 0
i += (in[i] & 0xFF) + 1; // Skip to next sub-block
}
return i + 1;
}
/**
* @param in Raw data
* @param colors Pre-initialized target array to store ARGB colors
* @param i Index of the color table's first byte
* @return Index of the first byte after the color table
*/
static int readColTbl(final byte[] in, final int[] colors, int i) {
final int numColors = colors.length;
for (int c = 0; c < numColors; c++) {
final int a = 0xFF; // Alpha 255 (opaque)
final int r = in[i++] & 0xFF; // 1st byte is red
final int g = in[i++] & 0xFF; // 2nd byte is green
final int b = in[i++] & 0xFF; // 3rd byte is blue
colors[c] = ((a << 8 | r) << 8 | g) << 8 | b;
}
return i;
}
/**
* @param fr GIF frame
* @param in Raw data
* @param i Index of the extension introducer
* @return Index of the first byte after this block
*/
static int readGraphicControlExt(final GifFrame fr, final byte[] in, final int i) {
fr.disposalMethod = (in[i + 3] & 0b00011100) >>> 2; // Bits 4-2
fr.transpColFlag = (in[i + 3] & 1) == 1; // Bit 0
fr.delay = in[i + 4] & 0xFF | (in[i + 5] & 0xFF) << 8; // 16 bit LSB
fr.transpColIndex = in[i + 6] & 0xFF; // Byte 6
return i + 8; // Skipped byte 7 (blockTerminator), as it's always 0x00
}
/**
* @param in Raw data
* @param img The GifImage object that is currently read
* @return Index of the first byte after this block
* @throws IOException If the GIF header/trailer is missing, incomplete or unknown
*/
static int readHeader(final byte[] in, final GifImage img) throws IOException {
if (in.length < 6) { // Check first 6 bytes
throw new IOException("Image is truncated.");
}
img.header = new String(in, 0, 6);
if (!img.header.equals("GIF87a") && !img.header.equals("GIF89a")) {
throw new IOException("Invalid GIF header.");
}
return 6;
}
/**
* @param fr The GIF frame to whom this image descriptor belongs
* @param in Raw data
* @param i Index of the first byte of this block, i.e. the minCodeSize
* @return Byte index
*/
static int readImgData(final GifFrame fr, final byte[] in, int i) {
final int fileSize = in.length;
final int minCodeSize = in[i++] & 0xFF; // Read code size, go to block
final int clearCode = 1 << minCodeSize; // CLEAR = 2^minCodeSize
fr.firstCodeSize = minCodeSize + 1; // Add 1 bit for CLEAR and EOI
fr.clearCode = clearCode;
fr.endOfInfoCode = clearCode + 1;
final int imgDataSize = readImgDataSize(in, i);
final byte[] imgData = new byte[imgDataSize + 2];
int imgDataPos = 0;
int subBlockSize = in[i] & 0xFF;
while (subBlockSize > 0) { // While block has data
try { // Next line may throw exception if sub-block size is fake
final int nextSubBlockSizePos = i + subBlockSize + 1;
final int nextSubBlockSize = in[nextSubBlockSizePos] & 0xFF;
arraycopy(in, i + 1, imgData, imgDataPos, subBlockSize);
imgDataPos += subBlockSize; // Move output data position
i = nextSubBlockSizePos; // Move to next sub-block size
subBlockSize = nextSubBlockSize;
} catch (final Exception e) {
// Sub-block exceeds file end, only use remaining bytes
subBlockSize = fileSize - i - 1; // Remaining bytes
arraycopy(in, i + 1, imgData, imgDataPos, subBlockSize);
imgDataPos += subBlockSize; // Move output data position
i += subBlockSize + 1; // Move to next sub-block size
break;
}
}
fr.data = imgData; // Holds LZW encoded data
i++; // Skip last sub-block size, should be 0
return i;
}
static int readImgDataSize(final byte[] in, int i) {
final int fileSize = in.length;
int imgDataPos = 0;
int subBlockSize = in[i] & 0xFF;
while (subBlockSize > 0) { // While block has data
try { // Next line may throw exception if sub-block size is fake
final int nextSubBlockSizePos = i + subBlockSize + 1;
final int nextSubBlockSize = in[nextSubBlockSizePos] & 0xFF;
imgDataPos += subBlockSize; // Move output data position
i = nextSubBlockSizePos; // Move to next sub-block size
subBlockSize = nextSubBlockSize;
} catch (final Exception e) {
// Sub-block exceeds file end, only use remaining bytes
subBlockSize = fileSize - i - 1; // Remaining bytes
imgDataPos += subBlockSize; // Move output data position
break;
}
}
return imgDataPos;
}
/**
* @param fr The GIF frame to whom this image descriptor belongs
* @param in Raw data
* @param i Index of the image separator, i.e. the first block byte
* @return Index of the first byte after this block
*/
static int readImgDescr(final GifFrame fr, final byte[] in, int i) {
fr.x = in[++i] & 0xFF | (in[++i] & 0xFF) << 8; // Byte 1-2: left
fr.y = in[++i] & 0xFF | (in[++i] & 0xFF) << 8; // Byte 3-4: top
fr.w = in[++i] & 0xFF | (in[++i] & 0xFF) << 8; // Byte 5-6: width
fr.h = in[++i] & 0xFF | (in[++i] & 0xFF) << 8; // Byte 7-8: height
fr.wh = fr.w * fr.h;
final byte b = in[++i]; // Byte 9 is a packed byte
fr.hasLocColTbl = (b & 0b10000000) >>> 7 == 1; // Bit 7
fr.interlaceFlag = (b & 0b01000000) >>> 6 == 1; // Bit 6
fr.sortFlag = (b & 0b00100000) >>> 5 == 1; // Bit 5
final int colTblSizePower = (b & 7) + 1; // Bits 2-0
fr.sizeOfLocColTbl = 1 << colTblSizePower; // 2^(N+1), As per the spec
return ++i;
}
/**
* @param img GIF image
* @param i Start index of this block.
* @return Index of the first byte after this block.
*/
static int readLogicalScreenDescriptor(final GifImage img, final byte[] in, final int i) {
img.w = in[i] & 0xFF | (in[i + 1] & 0xFF) << 8; // 16 bit, LSB 1st
img.h = in[i + 2] & 0xFF | (in[i + 3] & 0xFF) << 8; // 16 bit
img.wh = img.w * img.h;
final byte b = in[i + 4]; // Byte 4 is a packed byte
img.hasGlobColTbl = (b & 0b10000000) >>> 7 == 1; // Bit 7
final int colResPower = ((b & 0b01110000) >>> 4) + 1; // Bits 6-4
img.colorResolution = 1 << colResPower; // 2^(N+1), As per the spec
img.sortFlag = (b & 0b00001000) >>> 3 == 1; // Bit 3
final int globColTblSizePower = (b & 7) + 1; // Bits 0-2
img.sizeOfGlobColTbl = 1 << globColTblSizePower; // 2^(N+1), see spec
img.bgColIndex = in[i + 5] & 0xFF; // 1 Byte
img.pxAspectRatio = in[i + 6] & 0xFF; // 1 Byte
return i + 7;
}
/**
* @param in Raw data
* @param pos Index of the extension introducer
* @return Index of the first byte after this block
*/
static int readTextExtension(final byte[] in, final int pos) {
int i = pos + 2; // Skip extension introducer and label
int subBlockSize = in[i++] & 0xFF;
while (subBlockSize != 0 && i < in.length) {
i += subBlockSize;
subBlockSize = in[i++] & 0xFF;
}
return i;
}
}
src/main/java/org/auraclient/auraclient/AuraClient.java
+10 -3
View File
@@ -3,6 +3,7 @@ package org.auraclient.auraclient;
import net.fabricmc.api.ModInitializer;
import org.auraclient.auraclient.cloaks.Cloaks;
import org.auraclient.auraclient.event.KeyInputHandler;
import org.auraclient.auraclient.auth.AuraApi;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -17,8 +18,14 @@ public class AuraClient implements ModInitializer {
@Override
public void onInitialize() {
LOGGER.info("Initializing " + MOD_ID);
KeyInputHandler.register();
Cloaks.initialize();
LOGGER.info(MOD_ID + " initialization complete");
// Attempt authentication before initializing other features
if (AuraApi.authenticate()) {
KeyInputHandler.register();
Cloaks.initialize();
LOGGER.info(MOD_ID + " initialization complete");
} else {
LOGGER.error("Failed to authenticate with the server");
}
}
}
src/main/java/org/auraclient/auraclient/auth/AuraApi.java
+118
View File
@@ -0,0 +1,118 @@
package org.auraclient.auraclient.auth;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import net.minecraft.client.MinecraftClient;
import org.auraclient.auraclient.AuraClient;
import org.auraclient.auraclient.cloaks.Cloaks;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
public class AuraApi {
private static final String URL = "http://localhost:3000";
private static String token = null;
private static String uuid = null;
public static boolean authenticate() {
try {
MinecraftClient client = MinecraftClient.getInstance();
if (client.getSession() == null) {
AuraClient.LOGGER.error("No active Minecraft session found");
return false;
}
String accessToken = client.getSession().getAccessToken();
token = URLEncoder.encode(accessToken, StandardCharsets.UTF_8);
String authUrl = String.format("%s/auth?token=%s", URL, token);
AuraClient.LOGGER.info("Authenticating with URL: " + authUrl);
URL url = URI.create(authUrl).toURL();
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
BufferedReader reader = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
JsonObject jsonResponse = JsonParser.parseString(response.toString()).getAsJsonObject();
boolean success = jsonResponse.get("success").getAsBoolean();
uuid = jsonResponse.get("uuid").getAsString();
if (success) {
AuraClient.LOGGER.info("Successfully authenticated");
}
// Update available cloaks list
Cloaks.availableCloaks.clear();
jsonResponse.get("cloaks").getAsJsonArray()
.forEach(element -> Cloaks.availableCloaks.add(element.getAsString()));
String cloak = jsonResponse.get("cloak").getAsString();
if (cloak != null) {
AuraClient.LOGGER.info("Setting cloak to " + cloak + " for " + uuid);
Cloaks.playerCapes.put(uuid, cloak);
}
return success;
} catch (Exception e) {
AuraClient.LOGGER.error("Authentication failed", e);
return false;
}
}
public static void setCloak(String cloak) {
if (token == null) {
AuraClient.LOGGER.error("No token found");
return;
}
try {
String setCloakUrl = String.format("%s/cloak/%s?token=%s", URL, cloak, token);
URL url = URI.create(setCloakUrl).toURL();
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
BufferedReader reader = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
JsonObject jsonResponse = JsonParser.parseString(response.toString()).getAsJsonObject();
boolean success = jsonResponse.get("success").getAsBoolean();
if (success) {
AuraClient.LOGGER.info("Successfully set cloak");
} else {
AuraClient.LOGGER.error("Failed to set cloak");
AuraClient.LOGGER.error(jsonResponse.get("error").getAsString());
}
} catch (Exception e) {
AuraClient.LOGGER.error("Failed to set cloak", e);
}
}
}
src/main/java/org/auraclient/auraclient/cloaks/Cloaks.java
+13 -96
View File
@@ -1,11 +1,9 @@
package org.auraclient.auraclient.cloaks;
import at.dhyan.open_imaging.GifDecoder;
import net.minecraft.util.Identifier;
import org.auraclient.auraclient.AuraClient;
import org.auraclient.auraclient.cloaks.utils.AnimatedCapeData;
import org.auraclient.auraclient.auth.AuraApi;
import org.auraclient.auraclient.cloaks.utils.IdentifierUtils;
import org.auraclient.auraclient.cloaks.utils.RandomUtils;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
@@ -15,16 +13,11 @@ import java.util.*;
/**
* Manages the cloak/cape system for Aura Client.
* Handles loading, caching, and animating player capes.
* Handles loading and caching of player capes.
*/
public class Cloaks {
private static final String CAPES_RESOURCE_PATH = "assets/auraclient/textures/capes/";
private static final List<AnimatedCapeData> animatedCapeFrames = new ArrayList<>();
private static int currentFrameIndex = 0;
private static long lastFrameTime = System.currentTimeMillis();
private static String lastCachedCape = "NoCache";
public static final List<String> availableCapes = new ArrayList<>();
public static final List<String> availableCloaks = new ArrayList<>();
public static Identifier capeCacheIdentifier = null;
public static final Map<String, String> playerCapes = new HashMap<>();
@@ -33,86 +26,26 @@ public class Cloaks {
* Loads cape textures from resources.
*/
public static void initialize() {
availableCapes.clear();
availableCapes.add("");
loadCloakTextures();
}
/**
* Loads cloak textures from the resources.
* Supports both static (.png) and animated (.gif) capes.
*/
private static void loadCloakTextures() {
// In a resource-based system, we would need to manually list available capes
// For now, we can add default capes that we know exist in resources
// This would need to be updated when adding new capes to resources
availableCapes.add("glitch.png");
}
/**
* Updates the cape animation state.
* Called every tick to handle animated capes.
*/
public static void tick() {
String currentCape = playerCapes.values().stream().findFirst().orElse("");
if (!lastCachedCape.equals(currentCape)) {
handleCapeChange(currentCape);
} else if (currentCape.endsWith(".gif")) {
updateAnimatedCape();
}
availableCloaks.add(0, "");
}
/**
* Handles loading and caching of a new cape texture.
*
* @param capeName Name of the cape file to load
*/
private static void handleCapeChange(String capeName) {
public static void setCape(String uuid, String capeName) {
AuraApi.setCloak(capeName);
Cloaks.playerCapes.put(uuid, capeName);
if (!capeName.isEmpty()) {
if (capeName.endsWith(".gif")) {
loadAnimatedCape(capeName);
} else {
loadStaticCape(capeName);
}
lastCachedCape = capeName;
}
}
/**
* Loads and processes an animated cape from a GIF file in resources.
* @param fileName Name of the GIF file to load
*/
private static void loadAnimatedCape(String fileName) {
try {
animatedCapeFrames.clear();
String resourcePath = CAPES_RESOURCE_PATH + fileName;
InputStream inputStream = Cloaks.class.getClassLoader().getResourceAsStream(resourcePath);
if (inputStream != null) {
GifDecoder.GifImage gif = GifDecoder.read(inputStream);
int frameCount = gif.getFrameCount();
for (int i = 0; i < frameCount; i++) {
BufferedImage frame = gif.getFrame(i);
int delay = gif.getDelay(i);
Identifier frameId = Identifier.of(AuraClient.MOD_ID,
"capes_" + RandomUtils.randomStringLowercase(10));
IdentifierUtils.registerBufferedImageTexture(frameId, frame);
animatedCapeFrames.add(new AnimatedCapeData(frameId, delay));
}
currentFrameIndex = 0;
capeCacheIdentifier = animatedCapeFrames.get(0).getTextureId();
}
} catch (IOException e) {
AuraClient.LOGGER.error("Failed to load animated cape from resources: " + fileName, e);
loadStaticCape(capeName);
}
}
/**
* Loads and processes a static cape from a PNG file in resources.
*
* @param fileName Name of the PNG file to load
*/
private static void loadStaticCape(String fileName) {
@@ -124,8 +57,8 @@ public class Cloaks {
BufferedImage image = ImageIO.read(inputStream);
String safeFileName = fileName.toLowerCase(Locale.ROOT)
.replace(' ', '_')
.replaceAll("[^a-z0-9/._-]", "");
.replace(' ', '_')
.replaceAll("[^a-z0-9/._-]", "");
capeCacheIdentifier = Identifier.of(AuraClient.MOD_ID, "capes_" + safeFileName);
IdentifierUtils.registerBufferedImageTexture(capeCacheIdentifier, image);
@@ -135,20 +68,4 @@ public class Cloaks {
AuraClient.LOGGER.error("Failed to load static cape from resources: " + fileName, e);
}
}
/**
* Updates the current frame of an animated cape.
*/
private static void updateAnimatedCape() {
if (currentFrameIndex >= animatedCapeFrames.size()) {
currentFrameIndex = 0;
}
AnimatedCapeData currentFrame = animatedCapeFrames.get(currentFrameIndex);
if (System.currentTimeMillis() > lastFrameTime + currentFrame.getDelayMs()) {
lastFrameTime = System.currentTimeMillis();
capeCacheIdentifier = currentFrame.getTextureId();
currentFrameIndex++;
}
}
}
src/main/java/org/auraclient/auraclient/menus/CloakSelector.java
+6 -23
View File
@@ -1,43 +1,26 @@
package org.auraclient.auraclient.menus;
import org.auraclient.auraclient.AuraClient;
import org.auraclient.auraclient.cloaks.Cloaks;
import net.minecraft.client.gui.screen.Screen;
import net.minecraft.client.gui.widget.ButtonWidget;
import net.minecraft.client.gui.widget.TextFieldWidget;
import net.minecraft.text.Text;
public class CloakSelector extends Screen {
private TextFieldWidget playerNameField;
public CloakSelector() {
super(Text.literal("Cloaks"));
}
@Override
protected void init() {
// Add player name text field at the top
this.playerNameField = new TextFieldWidget(this.textRenderer,
(this.width - 200) / 2, 20, 200, 20, Text.literal("Player Name"));
this.playerNameField.setMaxLength(16);
addDrawableChild(this.playerNameField);
int y = ((this.height - (35 * (Cloaks.availableCloaks.size()))) / 2) + 30;
// Calculate starting Y position for cloak buttons, accounting for text field
int y = ((this.height - (35 * (Cloaks.availableCapes.size()))) / 2) + 30;
for (String cloak : Cloaks.availableCapes) {
for (String cloak : Cloaks.availableCloaks) {
addDrawableChild(ButtonWidget.builder(Text.literal(cloak), (__) -> {
String playerName = this.playerNameField.getText();
if (!playerName.isEmpty() && !playerName.equals("Player Name")) {
if (cloak.isEmpty()) {
Cloaks.playerCapes.remove(playerName);
AuraClient.LOGGER.info("Cape removed for player: " + playerName);
} else {
Cloaks.playerCapes.put(playerName, cloak);
AuraClient.LOGGER.info("Cape set for player: " + playerName + " to " + cloak);
}
}
String uuid = client.player.getUuidAsString().replace("-", "");
Cloaks.setCape(uuid, cloak);
// Cloaks.playerCapes.put(uuid, cloak);
// AuraApi.setCloak(cloak);
}).dimensions((this.width - 50) / 2, y, 50, 30).build());
y += 35;
src/main/java/org/auraclient/auraclient/menus/MainMenu.java
+1 -1
View File
@@ -6,7 +6,7 @@ import net.minecraft.text.Text;
public class MainMenu extends Screen {
public MainMenu() {
super(Text.literal("Custom Screen"));
super(Text.literal("Aura Client"));
}
@Override
src/main/java/org/auraclient/auraclient/mixin/AbstractClientPlayerEntityMixin.java
+17 -16
View File
@@ -4,6 +4,7 @@ import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.client.network.AbstractClientPlayerEntity;
import net.minecraft.client.util.SkinTextures;
import net.minecraft.util.Identifier;
import org.auraclient.auraclient.cloaks.Cloaks;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
@@ -20,28 +21,28 @@ public class AbstractClientPlayerEntityMixin {
/**
* Injects custom cape textures into the player's skin textures.
*
* @param cir Callback containing the original skin textures
*/
@Inject(
method = "getSkinTextures",
at = @At("RETURN"),
cancellable = true
)
@Inject(method = "getSkinTextures", at = @At("RETURN"), cancellable = true)
private void getSkinTextures(CallbackInfoReturnable<SkinTextures> cir) {
AbstractClientPlayerEntity player = (AbstractClientPlayerEntity) (Object) this;
if (Cloaks.playerCapes.containsKey(player.getName().getString()) &&
Cloaks.capeCacheIdentifier != null) {
String uuid = player.getUuidAsString().replace("-", "");
SkinTextures textures = cir.getReturnValue();
cir.setReturnValue(new SkinTextures(
textures.texture(),
textures.textureUrl(),
Cloaks.capeCacheIdentifier,
textures.elytraTexture(),
textures.model(),
textures.secure()
));
if (Cloaks.playerCapes.containsKey(uuid)) {
String cloak = Cloaks.playerCapes.get(uuid);
if (!cloak.isEmpty()) {
SkinTextures textures = cir.getReturnValue();
cir.setReturnValue(new SkinTextures(
textures.texture(),
textures.textureUrl(),
Identifier.of("auraclient", "textures/capes/" + cloak + ".png"),
textures.elytraTexture(),
textures.model(),
textures.secure()));
}
}
}
}
src/main/java/org/auraclient/auraclient/mixin/MinecraftClientMixin.java
-31
View File
@@ -1,31 +0,0 @@
package org.auraclient.auraclient.mixin;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.client.MinecraftClient;
import org.auraclient.auraclient.cloaks.Cloaks;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
/**
* Mixin for the MinecraftClient class.
* Handles the periodic updating of cloaks system.
*/
@Mixin(MinecraftClient.class)
@Environment(EnvType.CLIENT)
public class MinecraftClientMixin {
/**
* Injects into the client tick to update cloaks.
* @param ci Callback info
*/
@Inject(
method = "tick",
at = @At("HEAD")
)
private void tick(CallbackInfo ci) {
Cloaks.tick();
}
}
src/main/resources/auraclient.mixins.json
+1 -4
View File
@@ -3,10 +3,7 @@
"minVersion": "0.8",
"package": "org.auraclient.auraclient.mixin",
"compatibilityLevel": "JAVA_17",
"client": [
"AbstractClientPlayerEntityMixin",
"MinecraftClientMixin"
],
"client": ["AbstractClientPlayerEntityMixin"],
"injectors": {
"defaultRequire": 1
}