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(ExeFile): new class to seek for resources within EXE files.

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This commit is contained in:
morkt
2017-01-23 18:35:16 +04:00
parent c879c60a41
commit 42dce0e586
5 changed files with 290 additions and 129 deletions
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72
ArcFormats/KiriKiri/ArcXP3.cs
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@@ -295,67 +295,23 @@ NextEntry:
private long SkipExeHeader (ArcView file)
{
long offset = 0x10;
long pe_offset = file.View.ReadUInt32 (0x3c);
if (pe_offset < file.MaxOffset && 0x4550 == file.View.ReadUInt32 (pe_offset)) // 'PE'
var exe = new ExeFile (file);
if (exe.ContainsSection (".rsrc"))
{
int opt_header = file.View.ReadUInt16 (pe_offset+0x14); // SizeOfOptionalHeader
offset = file.View.ReadUInt32 (pe_offset+0x54); // SizeOfHeaders
long section_table = pe_offset+opt_header+0x18;
int count = file.View.ReadUInt16 (pe_offset+6); // NumberOfSections
if (section_table + 0x28*count < file.MaxOffset)
{
for (int i = 0; i < count; ++i)
{
uint size = file.View.ReadUInt32 (section_table+0x10);
uint addr = file.View.ReadUInt32 (section_table+0x14);
if (file.View.AsciiEqual (section_table, ".rsrc\0"))
{
// look within EXE resource section
offset = addr;
break;
}
section_table += 0x28;
if (0 != size)
offset = Math.Max ((long)addr + size, offset);
}
}
var offset = exe.FindString (exe.Sections[".rsrc"], s_xp3_header);
if (offset != -1 && 0 != file.View.ReadUInt32 (offset+s_xp3_header.Length))
return offset;
}
unsafe
var section = exe.Overlay;
while (section.Offset < file.MaxOffset)
{
while (offset < file.MaxOffset)
{
uint page_size = (uint)Math.Min (0x10000L, file.MaxOffset - offset);
if (page_size < 0x20)
break;
using (var view = file.CreateViewAccessor (offset, page_size))
{
byte* page_begin = view.GetPointer (offset);
byte* page_end = page_begin + page_size - 0x10;
try {
for (byte* ptr = page_begin; ptr != page_end; ++ptr)
{
// TODO: search every byte only when inside resource section,
// otherwise stick to paragraph boundary.
int i = 0;
while (ptr[i] == s_xp3_header[i])
{
if (++i == s_xp3_header.Length)
{
// check whether index offset is non-zero
if (0 == *(uint*)(ptr+i))
break;
return offset + (ptr - page_begin);
}
}
}
}
finally {
view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
offset += page_size - 0x10;
}
var offset = exe.FindString (section, s_xp3_header, 0x10);
if (-1 == offset)
break;
if (0 != file.View.ReadUInt32 (offset+s_xp3_header.Length))
return offset;
section.Offset = offset + 0x10;
section.Size = (uint)(file.MaxOffset - section.Offset);
}
return 0;
}