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private class QuickTimeAtom {
private GLib.File file = null;
private string section_name = "";
private uint64 section_size = 0;
private uint64 section_offset = 0;
private GLib.DataInputStream input = null;
private QuickTimeAtom? parent = null;
public QuickTimeAtom(GLib.File file) {
this.file = file;
}
private QuickTimeAtom.with_input_stream(GLib.DataInputStream input, QuickTimeAtom parent) {
this.input = input;
this.parent = parent;
}
public void open_file() throws GLib.Error {
close_file();
input = new GLib.DataInputStream(file.read());
input.set_byte_order(DataStreamByteOrder.BIG_ENDIAN);
section_size = 0;
section_offset = 0;
section_name = "";
}
public void close_file() throws GLib.Error {
if (null != input) {
input.close();
input = null;
}
}
private void advance_section_offset(uint64 amount) {
section_offset += amount;
if (null != parent) {
parent.advance_section_offset(amount);
}
}
public QuickTimeAtom get_first_child_atom() {
// Child will simply have the input stream
// but not the size/offset. This works because
// child atoms follow immediately after a header,
// so no skipping is required to access the child
// from the current position.
return new QuickTimeAtom.with_input_stream(input, this);
}
public uchar read_byte() throws GLib.Error {
advance_section_offset(1);
return input.read_byte();
}
public uint32 read_uint32() throws GLib.Error {
advance_section_offset(4);
return input.read_uint32();
}
public uint64 read_uint64() throws GLib.Error {
advance_section_offset(8);
return input.read_uint64();
}
public void read_atom() throws GLib.Error {
// Read atom size.
section_size = read_uint32();
// Read atom name.
GLib.StringBuilder sb = new GLib.StringBuilder();
sb.append_c((char) read_byte());
sb.append_c((char) read_byte());
sb.append_c((char) read_byte());
sb.append_c((char) read_byte());
section_name = sb.str;
// Check string.
if (section_name.length != 4) {
throw new IOError.NOT_SUPPORTED("QuickTime atom name length is invalid for %s",
file.get_path());
}
for (int i = 0; i < section_name.length; i++) {
if (!section_name[i].isprint()) {
throw new IOError.NOT_SUPPORTED("Bad QuickTime atom in file %s", file.get_path());
}
}
if (1 == section_size) {
// This indicates the section size is a 64-bit
// value, specified below the atom name.
section_size = read_uint64();
}
}
private void skip(uint64 skip_amount) throws GLib.Error {
skip_uint64(input, skip_amount);
}
public uint64 section_size_remaining() {
assert(section_size >= section_offset);
return section_size - section_offset;
}
public void next_atom() throws GLib.Error {
skip(section_size_remaining());
section_size = 0;
section_offset = 0;
}
public string get_current_atom_name() {
return section_name;
}
public bool is_last_atom() {
return 0 == section_size;
}
}
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