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Diffstat (limited to 'gnu/javax/imageio/gif/GIFFile.java')
-rw-r--r--gnu/javax/imageio/gif/GIFFile.java296
1 files changed, 148 insertions, 148 deletions
diff --git a/gnu/javax/imageio/gif/GIFFile.java b/gnu/javax/imageio/gif/GIFFile.java
index ec0a3103d..941397a0e 100644
--- a/gnu/javax/imageio/gif/GIFFile.java
+++ b/gnu/javax/imageio/gif/GIFFile.java
@@ -43,14 +43,14 @@ import java.util.Vector;
/**
* GIFFile - reads a GIF file.
- *
+ *
* This class only does the bare minimum work, and returns the data in raw
* formats (described below). The class is J2ME compatible, and hopefully
* we can keep it that way without any significant overhead.
*
- * @author Sven de Marothy.
+ * @author Sven de Marothy.
*/
-public class GIFFile
+public class GIFFile
{
// "NETSCAPE2.0" - identifier
private final static byte[] nsBlock = new byte[]
@@ -67,7 +67,7 @@ public class GIFFile
* Extension block types
*/
private final static int EXTENSION_COMMENT = 254;
- private final static int EXTENSION_GCONTROL = 249;
+ private final static int EXTENSION_GCONTROL = 249;
private final static int EXTENSION_APPLICATION = 255;
/**
@@ -75,7 +75,7 @@ public class GIFFile
*/
private final static int UNDRAW_OVERWRITE = 1;
private final static int UNDRAW_RESTORE_BACKGROUND = 2;
- private final static int UNDRAW_RESTORE_PREVIOUS = 3;
+ private final static int UNDRAW_RESTORE_PREVIOUS = 3;
/**
* Image position and dimensions (images may be partial)
@@ -121,7 +121,7 @@ public class GIFFile
* Has transparency?
*/
private boolean hasTransparency;
-
+
/**
* Undraw mode (animations)
*/
@@ -181,7 +181,7 @@ public class GIFFile
* @throws IOException if an I/O error occured.
* @throws GIFException if some file parsing error occured
*/
- public GIFFile(InputStream in) throws IOException, GIFException
+ public GIFFile(InputStream in) throws IOException, GIFException
{
// Validate the signature
if( !readSignature( in ) )
@@ -190,7 +190,7 @@ public class GIFFile
{
byte[] data = new byte[7];
if (in.read(data) != 7)
- throw new IOException("Couldn't read global descriptor.");
+ throw new IOException("Couldn't read global descriptor.");
globalWidth = ((data[1] & 0xFF) << 8) | (data[0] & 0xFF);
globalHeight = ((data[3] & 0xFF) << 8) | (data[2] & 0xFF);
@@ -202,37 +202,37 @@ public class GIFFile
if( hasGlobalColorMap )
{
- globalPalette = new byte[ nColors * 3 ];
- if( in.read( globalPalette ) != nColors * 3 )
- throw new IOException("Couldn't read color map.");
+ globalPalette = new byte[ nColors * 3 ];
+ if( in.read( globalPalette ) != nColors * 3 )
+ throw new IOException("Couldn't read color map.");
}
-
+
int c = in.read();
while( c == EXTENSION )
{
- readExtension( in );
- c = in.read();
+ readExtension( in );
+ c = in.read();
}
-
+
if( c != LOCAL )
throw new GIFException("Extension blocks not followed by a local descriptor ("+c+")");
loadImage( in );
- c = in.read();
+ c = in.read();
if( c == TERMINATOR ) // Not an animated GIF.
return;
- // Load animation frames. Just quit if an error occurs instead
+ // Load animation frames. Just quit if an error occurs instead
// of throwing an exception.
animationFrames = new Vector();
- try
+ try
{
- while( c != TERMINATOR )
- {
- animationFrames.add( new GIFFile( this, in, c ) );
- c = in.read();
- }
+ while( c != TERMINATOR )
+ {
+ animationFrames.add( new GIFFile( this, in, c ) );
+ c = in.read();
+ }
}
catch(IOException ioe)
{
@@ -245,8 +245,8 @@ public class GIFFile
/**
* Constructor for additional animation frames.
*/
- private GIFFile(GIFFile parent, InputStream in, int c)
- throws IOException, GIFException
+ private GIFFile(GIFFile parent, InputStream in, int c)
+ throws IOException, GIFException
{
// Copy global properties.
globalWidth = parent.globalWidth;
@@ -261,10 +261,10 @@ public class GIFFile
while( c == EXTENSION )
{
- readExtension( in );
+ readExtension( in );
c = in.read();
}
-
+
if( c != LOCAL )
throw new GIFException("Extension blocks not followed by a local descriptor ("+c+")");
@@ -279,21 +279,21 @@ public class GIFFile
* @throws IOException if the signature could not be read.
*/
public static boolean readSignature( InputStream in ) throws IOException
- {
+ {
byte[] data = new byte[6];
if (in.read(data) != 6)
throw new IOException("Couldn't read signature.");
if( data[0] != 0x47 || data[1] != 0x49 || data[2] != 0x46 ||
- data[3] != 0x38 ) // GIF8
+ data[3] != 0x38 ) // GIF8
return false;
if( (data[4] != 0x39 && data[4] != 0x37) || // 7 | 9
- (data[5] != 0x61 && data[5] != 0x62) ) // 'a' or 'b'
+ (data[5] != 0x61 && data[5] != 0x62) ) // 'a' or 'b'
return false;
return true;
}
-
+
/**
* Loads the image local descriptor and then loads/decodes the image raster,
@@ -306,13 +306,13 @@ public class GIFFile
try
{
- decodeRaster( in );
+ decodeRaster( in );
}
catch(ArrayIndexOutOfBoundsException aioobe)
{
- throw new GIFException("Error decompressing image.");
+ throw new GIFException("Error decompressing image.");
}
-
+
if( interlaced ) // Clean up
deinterlace();
packPixels();
@@ -330,31 +330,31 @@ public class GIFFile
return;
int nbits = 1;
- int ppbyte = 8;
+ int ppbyte = 8;
if( nColors == 4 )
{
- nbits = 2;
- ppbyte = 4;
+ nbits = 2;
+ ppbyte = 4;
}
else if( nColors == 16 )
{
- nbits = 4;
- ppbyte = 2;
+ nbits = 4;
+ ppbyte = 2;
}
int rem = (width & (ppbyte - 1));
- int w = ( rem == 0 ) ? (width / ppbyte) :
- ((width + ppbyte - rem) / ppbyte);
+ int w = ( rem == 0 ) ? (width / ppbyte) :
+ ((width + ppbyte - rem) / ppbyte);
byte[] nr = new byte[ w * height ];
for(int j = 0; j < height; j++)
{
- for(int i = 0; i < width - ppbyte; i += ppbyte)
- for(int k = 0; k < ppbyte; k++)
- nr[ j * w + (i / ppbyte) ] |= (byte)((raster[ width * j + i + k ]
- << (8 - nbits * (1 + k))));
- for(int i = 0; i < rem; i++)
- nr[ j * w + w - 1 ] |= (byte)((raster[ width * j + width - rem + i ]
- << (nbits * (rem - i))));
+ for(int i = 0; i < width - ppbyte; i += ppbyte)
+ for(int k = 0; k < ppbyte; k++)
+ nr[ j * w + (i / ppbyte) ] |= (byte)((raster[ width * j + i + k ]
+ << (8 - nbits * (1 + k))));
+ for(int i = 0; i < rem; i++)
+ nr[ j * w + w - 1 ] |= (byte)((raster[ width * j + width - rem + i ]
+ << (nbits * (rem - i))));
}
raster = nr;
}
@@ -424,23 +424,23 @@ public class GIFFile
int n = 0;
for(int i = 0; i < ((height + 7) >> 3); i++)
{
- System.arraycopy( raster, n, nr, width * i * 8, width );
- n += width;
+ System.arraycopy( raster, n, nr, width * i * 8, width );
+ n += width;
}
for(int i = 0; i < ((height + 3) >> 3); i++)
{
- System.arraycopy( raster, n, nr, width * ( 8 * i + 4 ), width );
- n += width;
+ System.arraycopy( raster, n, nr, width * ( 8 * i + 4 ), width );
+ n += width;
}
for(int i = 0; i < (height >> 2); i++)
{
- System.arraycopy( raster, n, nr, width * (4 * i + 2), width );
- n += width;
+ System.arraycopy( raster, n, nr, width * (4 * i + 2), width );
+ n += width;
}
for(int i = 0; i < (height >> 1); i++)
{
- System.arraycopy( raster, n, nr, width * (2 * i + 1), width );
- n += width;
+ System.arraycopy( raster, n, nr, width * (2 * i + 1), width );
+ n += width;
}
raster = nr;
}
@@ -461,17 +461,17 @@ public class GIFFile
interlaced = (( flags & 0x40 ) != 0);
if( (flags & 0x80) != 0 )
{ // has a local color map
- int nLocalColors = (1 << (( flags & 0x07) + 1));
- if( !hasGlobalColorMap )
- nColors = nLocalColors;
- localPalette = new byte[ nLocalColors * 3 ];
- if( in.read( localPalette ) != nLocalColors * 3 )
- throw new IOException("Couldn't read color map.");
+ int nLocalColors = (1 << (( flags & 0x07) + 1));
+ if( !hasGlobalColorMap )
+ nColors = nLocalColors;
+ localPalette = new byte[ nLocalColors * 3 ];
+ if( in.read( localPalette ) != nLocalColors * 3 )
+ throw new IOException("Couldn't read color map.");
}
- }
+ }
/**
- * Returns the image's palette in raw format
+ * Returns the image's palette in raw format
* (r0,g0,b0,r1,g1,b2..r(Ncolors-1),g(Ncolors-1),b(Ncolors-1))
*/
public byte[] getRawPalette()
@@ -514,41 +514,41 @@ public class GIFFile
/**
* Handles extension blocks.
*/
- private void readExtension(InputStream in) throws IOException, GIFException
+ private void readExtension(InputStream in) throws IOException, GIFException
{
int functionCode = in.read();
byte[] data = readData(in);
switch( functionCode )
{
case EXTENSION_COMMENT: // comment block
- comment = new String(data, "8859_1");
- break;
+ comment = new String(data, "8859_1");
+ break;
case EXTENSION_GCONTROL: // Graphics control extension
- undraw = (data[0] & 0x1C) >> 2;
- // allegedly there can be bad values of this.
- if( undraw < 1 && undraw > 3 ) undraw = 1;
- hasTransparency = ((data[0] & 0x01) == 1);
- transparentIndex = (data[3] & 0xFF);
- duration = ((data[2] & 0xFF) << 8) | (data[1] & 0xFF);
- break;
-
- // Application extension. We only parse the Netscape animation
- // extension here. Which is the only one most use anyway.
+ undraw = (data[0] & 0x1C) >> 2;
+ // allegedly there can be bad values of this.
+ if( undraw < 1 && undraw > 3 ) undraw = 1;
+ hasTransparency = ((data[0] & 0x01) == 1);
+ transparentIndex = (data[3] & 0xFF);
+ duration = ((data[2] & 0xFF) << 8) | (data[1] & 0xFF);
+ break;
+
+ // Application extension. We only parse the Netscape animation
+ // extension here. Which is the only one most use anyway.
case EXTENSION_APPLICATION:
- boolean isNS = true;
- for(int i = 0; i < nsBlock.length; i++ )
- if( nsBlock[i] != data[i] )
- isNS = false;
- if( isNS )
- {
- isLooped = true;
- loops = ((data[12] & 0xFF) << 8) | (data[13] & 0xFF);
- }
- break;
+ boolean isNS = true;
+ for(int i = 0; i < nsBlock.length; i++ )
+ if( nsBlock[i] != data[i] )
+ isNS = false;
+ if( isNS )
+ {
+ isLooped = true;
+ loops = ((data[12] & 0xFF) << 8) | (data[13] & 0xFF);
+ }
+ break;
default:
- break;
+ break;
}
}
@@ -563,11 +563,11 @@ public class GIFFile
int n = in.read();
do
{
- totalBytes += n;
- byte[] block = new byte[ n ];
- in.read(block);
- v.add(block);
- n = in.read();
+ totalBytes += n;
+ byte[] block = new byte[ n ];
+ in.read(block);
+ v.add(block);
+ n = in.read();
}
while( n > 0 );
@@ -575,9 +575,9 @@ public class GIFFile
byte[] bigBuffer = new byte[ totalBytes ];
for( int i = 0; i < v.size(); i++ )
{
- byte[] block = (byte[])v.elementAt(i);
- System.arraycopy(block, 0, bigBuffer, n, block.length);
- n += block.length;
+ byte[] block = (byte[])v.elementAt(i);
+ System.arraycopy(block, 0, bigBuffer, n, block.length);
+ n += block.length;
}
return bigBuffer;
}
@@ -617,65 +617,65 @@ public class GIFFile
for(short i = 0; i < nColors; i ++ )
{
- dictionary[i][0] = i; // color index
- dictionary[i][1] = -1; // parent
- dictionary[i][2] = i; // first
- dictionary[i][3] = 1; // depth
+ dictionary[i][0] = i; // color index
+ dictionary[i][1] = -1; // parent
+ dictionary[i][2] = i; // first
+ dictionary[i][3] = 1; // depth
}
code = getBits( codeSize ); // get second code
raster[ rasterIndex++ ] = (byte)dictionary[code][0];
- int old = code;
+ int old = code;
code = getBits( codeSize ); // start at the third code
int c;
do
{
- if( code == clearCode )
- {
- codeSize = initialCodeSize + 1;
- nextCode = endCode + 1;
- // get and output second code
- code = getBits( codeSize );
- raster[ rasterIndex++ ] = (byte)dictionary[code][0];
- old = code;
- }
- else
- {
- dictionary[nextCode][1] = (short)old; // parent = old
- dictionary[nextCode][2] = dictionary[old][2]; // first pixel
- dictionary[nextCode][3] = (short)(dictionary[old][3] + 1); // depth
-
- // appended pixel = first pixel of c
- if( code < nextCode )
- {
- dictionary[nextCode][0] = dictionary[code][2];
- old = code;
- }
- else // first of old
- {
- dictionary[nextCode][0] = dictionary[old][2];
- old = nextCode;
- }
-
- c = old;
- // output the code c
- int depth = dictionary[c][3];
- for( int i = depth - 1; i >= 0; i-- )
- {
- raster[ rasterIndex + i ] = (byte)dictionary[c][0];
- c = dictionary[c][1]; // go to parent.
- }
- rasterIndex += depth;
- nextCode ++;
-
- if( codeSize < 12 && nextCode >= (1 << codeSize) )
- codeSize++;
- }
- code = getBits( codeSize );
+ if( code == clearCode )
+ {
+ codeSize = initialCodeSize + 1;
+ nextCode = endCode + 1;
+ // get and output second code
+ code = getBits( codeSize );
+ raster[ rasterIndex++ ] = (byte)dictionary[code][0];
+ old = code;
+ }
+ else
+ {
+ dictionary[nextCode][1] = (short)old; // parent = old
+ dictionary[nextCode][2] = dictionary[old][2]; // first pixel
+ dictionary[nextCode][3] = (short)(dictionary[old][3] + 1); // depth
+
+ // appended pixel = first pixel of c
+ if( code < nextCode )
+ {
+ dictionary[nextCode][0] = dictionary[code][2];
+ old = code;
+ }
+ else // first of old
+ {
+ dictionary[nextCode][0] = dictionary[old][2];
+ old = nextCode;
+ }
+
+ c = old;
+ // output the code c
+ int depth = dictionary[c][3];
+ for( int i = depth - 1; i >= 0; i-- )
+ {
+ raster[ rasterIndex + i ] = (byte)dictionary[c][0];
+ c = dictionary[c][1]; // go to parent.
+ }
+ rasterIndex += depth;
+ nextCode ++;
+
+ if( codeSize < 12 && nextCode >= (1 << codeSize) )
+ codeSize++;
+ }
+ code = getBits( codeSize );
}
while( code != endCode && dataBlockIndex < compressedData.length );
-
+
compressedData = null; // throw away compressed data.
}
@@ -686,9 +686,9 @@ public class GIFFile
{
while( nbits > remainingBits )
{
- int c = (compressedData[ dataBlockIndex++ ] & 0xFF) << remainingBits;
- currentBits |= c;
- remainingBits += 8;
+ int c = (compressedData[ dataBlockIndex++ ] & 0xFF) << remainingBits;
+ currentBits |= c;
+ remainingBits += 8;
}
int rval = (currentBits & ((1 << nbits) - 1));
currentBits = (currentBits >> nbits);
@@ -699,7 +699,7 @@ public class GIFFile
/**
* Generic exception used by GIFFile to report decoding errors.
*/
- public static class GIFException extends Exception
+ public static class GIFException extends Exception
{
public GIFException(String message)
{
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