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(Silky.ArcOpener): check for duplicate entry offsets.

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This commit is contained in:
morkt 2017-04-10 22:04:23 +04:00
parent 3763a054dd
commit 2fd4d2cf7d
1 changed files with 3 additions and 4 deletions
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7
ArcFormats/Silky/ArcARC.cs
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@ -23,12 +23,8 @@
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Silky
{
@ -56,6 +52,7 @@ namespace GameRes.Formats.Silky
uint index_size = (uint)(count * (name_length + 8));
if (index_size > file.View.Reserve (index_offset, index_size))
return null;
var seen_offsets = new HashSet<uint>();
var dir = new List<Entry>();
for (int i = 0; i < count; ++i)
{
@ -68,6 +65,8 @@ namespace GameRes.Formats.Silky
entry.Size = file.View.ReadUInt32 (index_offset+4);
if (entry.Offset < index_size+4 || !entry.CheckPlacement (file.MaxOffset))
return null;
if (!seen_offsets.Add ((uint)entry.Offset))
return null;
dir.Add (entry);
index_offset += 8;
}