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private class AVIChunk {
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 AVIChunk? parent = null;
private const int MAX_STRING_TO_SECTION_LENGTH = 1024;
public AVIChunk(GLib.File file) {
this.file = file;
}
private AVIChunk.with_input_stream(GLib.DataInputStream input, AVIChunk 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.LITTLE_ENDIAN);
section_size = 0;
section_offset = 0;
section_name = "";
}
public void close_file() throws GLib.Error {
if (null != input) {
input.close();
input = null;
}
}
public void nonsection_skip(uint64 skip_amount) throws GLib.Error {
skip_uint64(input, skip_amount);
}
public void skip(uint64 skip_amount) throws GLib.Error {
advance_section_offset(skip_amount);
skip_uint64(input, skip_amount);
}
public AVIChunk get_first_child_chunk() {
return new AVIChunk.with_input_stream(input, this);
}
private void advance_section_offset(uint64 amount) {
if ((section_offset + amount) > section_size)
amount = section_size - section_offset;
section_offset += amount;
if (null != parent) {
parent.advance_section_offset(amount);
}
}
public uchar read_byte() throws GLib.Error {
advance_section_offset(1);
return input.read_byte();
}
public uint16 read_uint16() throws GLib.Error {
advance_section_offset(2);
return input.read_uint16();
}
public void read_chunk() throws GLib.Error {
// don't use checked reads here because they advance the section offset, which we're trying
// to determine here
GLib.StringBuilder sb = new GLib.StringBuilder();
sb.append_c((char) input.read_byte());
sb.append_c((char) input.read_byte());
sb.append_c((char) input.read_byte());
sb.append_c((char) input.read_byte());
section_name = sb.str;
section_size = input.read_uint32();
section_offset = 0;
}
public string read_name() throws GLib.Error {
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());
return sb.str;
}
public void next_chunk() throws GLib.Error {
skip(section_size_remaining());
section_size = 0;
section_offset = 0;
}
public string get_current_chunk_name() {
return section_name;
}
public bool is_last_chunk() {
return section_size == 0;
}
public uint64 section_size_remaining() {
assert(section_size >= section_offset);
return section_size - section_offset;
}
// Reads section contents into a string.
public string section_to_string() throws GLib.Error {
GLib.StringBuilder sb = new GLib.StringBuilder();
while (section_offset < section_size) {
sb.append_c((char) read_byte());
if (sb.len > MAX_STRING_TO_SECTION_LENGTH) {
return sb.str;
}
}
return sb.str;
}
}
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