/** Reads Graphics Control Extension values */
protected void readGraphicControlExt() {
read(); // block size
final int packed = read(); // packed fields
currentFrame.dispose = (packed & 0x1c) >> 2; // disposal method
if (currentFrame.dispose == 0) {
currentFrame.dispose = 1; // elect to keep old image if discretionary
}
currentFrame.transparency = (packed & 1) != 0;
currentFrame.delay = readShort() * 10; // delay in milliseconds
currentFrame.transIndex = read(); // transparent color index
read(); // block terminator
}
/**
* Reads GIF image from stream
*
* @param is containing GIF file.
* @return read status code (0 = no errors)
*/
public int read(final InputStream is, final int contentLength) {
if (is != null) {
try {
final int capacity = (contentLength > 0) ? (contentLength + 4096) : 4096;
final ByteArrayOutputStream buffer = new ByteArrayOutputStream(capacity);
int nRead;
final byte[] data = new byte[16384];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
read(buffer.toByteArray());
} catch (final IOException e) {
Log.w(TAG, "Error reading data from stream", e);
}
} else {
status = STATUS_OPEN_ERROR;
}
try {
is.close();
} catch (final Exception e) {
Log.w(TAG, "Error closing stream", e);
}
return status;
}
private void skipBitmapData() {
read(); // code size
skip();
}
