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(System21): support different entry name lengths.

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This commit is contained in:
morkt 2019-01-04 06:52:11 +04:00
parent 056e36813b
commit 7b1e3c0031
1 changed files with 27 additions and 7 deletions
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34
Legacy/System21/ArcPAK.cs
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@ -30,6 +30,7 @@ using System.IO;
// [000114][Excellents] Thanksgiving Special
// [000615][Beenyan] Oyako Donburi
// [010511][Haoh] May Club DX
namespace GameRes.Formats.System21
{
@ -47,30 +48,49 @@ namespace GameRes.Formats.System21
Signatures = new uint[] { 0x978FAD8F, 0x798AF589 }; // '快楽'
}
static readonly byte[] NameSizes = { 0x14, 0x34, 0x64 };
public override ArcFile TryOpen (ArcView file)
{
bool new_version = file.View.ReadUInt32 (0) == 0x798AF589u;
uint name_size = new_version ? 0x34u : 0x64u;
uint data_offset = file.View.ReadUInt32 (4);
int count = (int)((data_offset - 12) / (name_size + 4));
if (!IsSaneCount (count))
return null;
int n = new_version ? 0 : 2;
uint index_size = data_offset - 12;
var dir = new List<Entry>();
for (; n < NameSizes.Length; ++n)
{
uint name_size = NameSizes[n];
if (index_size % (name_size + 4) != 0)
continue;
int count = (int)(index_size / (name_size + 4));
if (!IsSaneCount (count))
continue;
dir.Clear();
if (ReadIndex (file, count, data_offset, dir, name_size))
return new ArcFile (file, this, dir);
}
return null;
}
bool ReadIndex (ArcView file, int count, uint data_offset, List<Entry> dir, uint name_size)
{
uint index_offset = 12;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset, name_size);
if (string.IsNullOrEmpty (name))
return false;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = data_offset;
entry.Size = file.View.ReadUInt32 (index_offset + name_size);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
return false;
dir.Add (entry);
index_offset += name_size + 4;
data_offset += entry.Size;
}
return new ArcFile (file, this, dir);
return true;
}
}
}