public int read(byte[] buffer, int pos, int len) throws IOException {
if (transparent) {
return (input.read(buffer, pos, len));
}
// [header]
// file [body-start -> body-end]
long start_pos = seek_position;
int start_len = len;
if (seek_position < header.length) {
int rem = (int) (header.length - seek_position);
if (rem > len) {
rem = len;
}
System.arraycopy(header, (int) seek_position, buffer, pos, rem);
pos += rem;
len -= rem;
seek_position += rem;
}
if (len > 0) {
long file_position = body_start + seek_position - header.length;
long rem = body_end - file_position;
if (len < rem) {
rem = len;
}
input.seek(file_position);
int temp = input.read(buffer, pos, (int) rem);
pos += temp;
len -= temp;
seek_position += temp;
}
int read = start_len - len;
seek_position = start_pos + read;
return (read);
}
public void seek(long pos) throws IOException {
if (transparent) {
input.seek(pos);
} else {
seek_position = pos;
}
}
public Atom(FileAccessor input) throws IOException {
offset = input.getFilePointer();
// get atom size
size = input.readInt();
// get atom type
byte[] atomTypeFCC = new byte[4];
input.readFully(atomTypeFCC);
type = new String(atomTypeFCC);
if (size == 1) {
// 64 bit size. Read new size from body and store it
size = input.readLong();
}
// skip back to atom start
input.seek(offset);
}
public QTFastStartRAF(FileAccessor accessor, boolean enable) throws IOException {
input = accessor;
if (enable) {
String name = accessor.getName();
boolean log;
String fail = null;
synchronized (tested) {
log = !tested.contains(name);
if (log) {
tested.add(name);
}
}
try {
Atom ah = null;
Atom ftypAtom = null;
boolean gotFtyp = false;
boolean gotMdat = false;
boolean justCopy = false;
while (input.getFilePointer() < input.length()) {
ah = new Atom(input);
// System.out.println( "got " + ah.type +", size=" + ah.size );
if (!isValidTopLevelAtom(ah)) {
throw new IOException("Non top level QT atom found (" + ah.type + "). File invalid?");
}
if (gotFtyp && !gotMdat && ah.type.equalsIgnoreCase(ATOM_MOOV)) {
justCopy = true;
break;
}
// store ftyp atom to buffer
if (ah.type.equalsIgnoreCase(ATOM_FTYP)) {
ftypAtom = ah;
ftypAtom.fillBuffer(input);
gotFtyp = true;
} else if (ah.type.equalsIgnoreCase(ATOM_MDAT)) {
gotMdat = true;
input.skipBytes((int) ah.size);
} else {
input.skipBytes((int) ah.size);
}
}
if (justCopy) {
transparent = true;
return;
}
if (ftypAtom == null) {
throw new IOException("No FTYP atom found");
}
if (ah == null || !ah.type.equalsIgnoreCase(ATOM_MOOV)) {
throw new IOException("Last QT atom was not the MOOV atom.");
}
input.seek(ah.offset);
Atom moovAtom = ah;
moovAtom.fillBuffer(input);
if (isCompressedMoovAtom(moovAtom)) {
throw new IOException("Compressed MOOV qt atoms are not supported");
}
patchMoovAtom(moovAtom);
body_start = ftypAtom.offset + ftypAtom.size;
body_end = moovAtom.offset;
header = new byte[ftypAtom.buffer.length + moovAtom.buffer.length];
System.arraycopy(ftypAtom.buffer, 0, header, 0, ftypAtom.buffer.length);
System.arraycopy(
moovAtom.buffer, 0, header, ftypAtom.buffer.length, moovAtom.buffer.length);
if (accessor.length() != header.length + (body_end - body_start)) {
throw (new IOException("Inconsistent: file size has changed"));
}
} catch (Throwable e) {
// e.printStackTrace();
fail = Debug.getNestedExceptionMessage(e);
transparent = true;
} finally {
input.seek(0);
if (log) {
String message;
if (fail == null) {
message = transparent ? "Not required" : "Required";
} else {
message = "Failed - " + fail;
}
Debug.outNoStack("MOOV relocation for " + accessor.getName() + ": " + message);
}
}
} else {
transparent = true;
}
}