public override ArcFile TryOpen(ArcView file)
{
if (!file.Name.HasExtension(".ani"))
{
return(null);
}
uint first_offset = file.View.ReadUInt32(0);
if (first_offset < 4 || file.MaxOffset > int.MaxValue || first_offset >= file.MaxOffset || 0 != (first_offset & 3))
{
return(null);
}
int frame_count = (int)(first_offset / 4);
if (frame_count > 10000)
{
return(null);
}
long index_offset = 4;
var frame_table = new uint[frame_count];
frame_table[0] = first_offset;
for (int i = 1; i < frame_count; ++i)
{
var offset = file.View.ReadUInt32(index_offset);
index_offset += 4;
if (offset < first_offset || offset >= file.MaxOffset)
{
return(null);
}
frame_table[i] = offset;
}
var frame_map = new Dictionary <uint, byte>();
foreach (var offset in frame_table)
{
if (!frame_map.ContainsKey(offset))
{
byte frame_type = file.View.ReadByte(offset);
if (frame_type >= 0x20)
{
return(null);
}
frame_map[offset] = frame_type;
}
}
int last_key_frame = 0;
var dir = new List <Entry>();
for (int i = 0; i < frame_count; ++i)
{
var offset = frame_table[i];
int frame_type = frame_map[offset];
if (1 == frame_type)
{
continue;
}
frame_type &= 0xF;
if (0 == frame_type || 0xA == frame_type)
{
last_key_frame = dir.Count;
}
var entry = new AniEntry
{
Name = i.ToString("D4"),
Type = "image",
Offset = offset,
FrameType = frame_type,
KeyFrame = last_key_frame,
FrameIndex = dir.Count,
};
dir.Add(entry);
}
if (0 == dir.Count)
{
return(null);
}
var ordered = dir.OrderBy(e => e.Offset).ToList();
for (int i = 0; i < ordered.Count; ++i)
{
var entry = ordered[i] as AniEntry;
long next_offset = file.MaxOffset;
for (int j = i + 1; j <= ordered.Count; ++j)
{
next_offset = j == ordered.Count ? file.MaxOffset : ordered[j].Offset;
if (next_offset != entry.Offset)
{
break;
}
}
entry.Size = (uint)(next_offset - entry.Offset);
}
return(new ArcFile(file, this, dir));
}
public override ArcFile TryOpen(ArcView file)
{
uint first_offset = file.View.ReadUInt32 (0);
if (first_offset < 4 || file.MaxOffset > int.MaxValue || first_offset >= file.MaxOffset || 0 != (first_offset & 3))
return null;
int frame_count = (int)(first_offset / 4);
if (frame_count > 10000)
return null;
long index_offset = 4;
var frame_table = new uint[frame_count];
frame_table[0] = first_offset;
for (int i = 1; i < frame_count; ++i)
{
var offset = file.View.ReadUInt32 (index_offset);
index_offset += 4;
if (offset < first_offset || offset >= file.MaxOffset)
return null;
frame_table[i] = offset;
}
var frame_map = new Dictionary<uint, byte>();
foreach (var offset in frame_table)
{
if (!frame_map.ContainsKey (offset))
{
byte frame_type = file.View.ReadByte (offset);
if (frame_type >= 0x20)
return null;
frame_map[offset] = frame_type;
}
}
int last_key_frame = 0;
var dir = new List<Entry>();
for (int i = 0; i < frame_count; ++i)
{
var offset = frame_table[i];
int frame_type = frame_map[offset];
if (1 == frame_type)
continue;
frame_type &= 0xF;
if (0 == frame_type || 0xA == frame_type)
last_key_frame = dir.Count;
var entry = new AniEntry
{
Name = string.Format ("{0:D4}.tga", i),
Type = "image",
Offset = offset,
FrameType = frame_type,
KeyFrame = last_key_frame,
FrameIndex = dir.Count,
};
dir.Add (entry);
}
if (0 == dir.Count)
return null;
var ordered = dir.OrderBy (e => e.Offset).ToList();
for (int i = 0; i < ordered.Count; ++i)
{
var entry = ordered[i] as AniEntry;
long next_offset = file.MaxOffset;
for (int j = i+1; j <= ordered.Count; ++j)
{
next_offset = j == ordered.Count ? file.MaxOffset : ordered[j].Offset;
if (next_offset != entry.Offset)
break;
}
entry.Size = (uint)(next_offset - entry.Offset);
}
return new ArcFile (file, this, dir);
}