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bunch of stuff.

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This commit is contained in:
morkt
2023-08-24 01:33:50 +04:00
parent ea096c52ef
commit 77fde27d26
119 changed files with 11078 additions and 619 deletions
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130
ArcFormats/ExeFile.cs
View File

@@ -37,6 +37,8 @@ namespace GameRes.Formats
ArcView m_file;
Dictionary<string, Section> m_section_table;
Section m_overlay;
uint m_image_base = 0;
List<ImageSection> m_section_list;
public ExeFile (ArcView file)
{
@@ -79,6 +81,16 @@ namespace GameRes.Formats
}
}
public uint ImageBase
{
get
{
if (0 == m_image_base)
InitImageBase();
return m_image_base;
}
}
/// <summary>
/// Structure representing section of executable file in the form of its offset and size.
/// </summary>
@@ -88,6 +100,16 @@ namespace GameRes.Formats
public uint Size;
}
public class ImageSection // IMAGE_SECTION_HEADER
{
public string Name;
public uint VirtualSize;
public uint VirtualAddress;
public uint SizeOfRawData;
public uint PointerToRawData;
public uint Characteristics;
}
/// <summary>
/// Returns true if executable file contains section <paramref name="name"/>.
/// </summary>
@@ -140,6 +162,16 @@ namespace GameRes.Formats
return -1;
}
public Section SectionByOffset (long offset)
{
foreach (var section in Sections.Values)
{
if (offset >= section.Offset && offset < section.Offset + section.Size)
return section;
}
return new Section { Offset = Whole.Size, Size = 0 };
}
public long FindAsciiString (Section section, string seq, int step = 1)
{
return FindString (section, Encoding.ASCII.GetBytes (seq), step);
@@ -152,26 +184,101 @@ namespace GameRes.Formats
return FindString (section, bytes, step);
}
/// <summary>
/// Convert virtual address into raw file offset.
/// </summary>
public long GetAddressOffset (uint address)
{
var section = GetAddressSection (address);
if (null == section)
return m_file.MaxOffset;
uint rva = address - ImageBase;
return section.PointerToRawData + (rva - section.VirtualAddress);
}
public string GetCString (uint address)
{
return GetCString (address, Encodings.cp932);
}
static readonly byte[] ZeroByte = new byte[1] { 0 };
/// <summary>
/// Returns null-terminated string from specified virtual address.
/// </summary>
public string GetCString (uint address, Encoding enc)
{
var section = GetAddressSection (address);
if (null == section)
return null;
uint rva = address - ImageBase;
uint offset = section.PointerToRawData + (rva - section.VirtualAddress);
uint size = section.PointerToRawData + section.SizeOfRawData - offset;
long eos = FindString (new Section { Offset = offset, Size = size }, ZeroByte);
if (eos < 0)
return null;
return View.ReadString (offset, (uint)(eos - offset), enc);
}
private ImageSection GetAddressSection (uint address)
{
var img_base = ImageBase;
if (address < img_base)
throw new ArgumentException ("Invalid virtual address.");
if (null == m_section_list)
InitSectionTable();
uint rva = address - img_base;
foreach (var section in m_section_list)
{
if (rva >= section.VirtualAddress && rva < section.VirtualAddress + section.SizeOfRawData)
return section;
}
return null;
}
private void InitImageBase ()
{
long hdr_offset = GetHeaderOffset() + 0x18;
if (View.ReadUInt16 (hdr_offset) != 0x010B)
throw new InvalidFormatException ("File is not a valid Windows 32-bit executable.");
m_image_base = View.ReadUInt32 (hdr_offset+0x1C); // ImageBase
}
private long GetHeaderOffset ()
{
long pe_offset = View.ReadUInt32 (0x3C);
if (pe_offset >= m_file.MaxOffset-0x58 || !View.AsciiEqual (pe_offset, "PE\0\0"))
throw new InvalidFormatException ("File is not a valid Windows 32-bit executable.");
return pe_offset;
}
private void InitSectionTable ()
{
long pe_offset = m_file.View.ReadUInt32 (0x3C);
if (pe_offset >= m_file.MaxOffset-0x58 || !m_file.View.AsciiEqual (pe_offset, "PE\0\0"))
throw new InvalidFormatException ("File is not a valid win32 executable.");
int opt_header = m_file.View.ReadUInt16 (pe_offset+0x14); // SizeOfOptionalHeader
long offset = m_file.View.ReadUInt32 (pe_offset+0x54); // SizeOfHeaders
long pe_offset = GetHeaderOffset();
int opt_header = View.ReadUInt16 (pe_offset+0x14); // SizeOfOptionalHeader
long section_table = pe_offset+opt_header+0x18;
int count = m_file.View.ReadUInt16 (pe_offset+6); // NumberOfSections
long offset = View.ReadUInt32 (pe_offset+0x54); // SizeOfHeaders
int count = View.ReadUInt16 (pe_offset+6); // NumberOfSections
var table = new Dictionary<string, Section> (count);
var list = new List<ImageSection> (count);
if (section_table + 0x28*count < m_file.MaxOffset)
{
for (int i = 0; i < count; ++i)
{
var name = m_file.View.ReadString (section_table, 8);
var section = new Section {
Size = m_file.View.ReadUInt32 (section_table+0x10),
Offset = m_file.View.ReadUInt32 (section_table+0x14)
var name = View.ReadString (section_table, 8);
var img_section = new ImageSection {
Name = name,
VirtualSize = View.ReadUInt32 (section_table+0x08),
VirtualAddress = View.ReadUInt32 (section_table+0x0C),
SizeOfRawData = View.ReadUInt32 (section_table+0x10),
PointerToRawData = View.ReadUInt32 (section_table+0x14),
Characteristics = View.ReadUInt32 (section_table+0x24),
};
var section = new Section {
Offset = img_section.PointerToRawData,
Size = img_section.SizeOfRawData
};
list.Add (img_section);
if (!table.ContainsKey (name))
table.Add (name, section);
if (0 != section.Size)
@@ -183,6 +290,7 @@ namespace GameRes.Formats
m_overlay.Offset = offset;
m_overlay.Size = (uint)(m_file.MaxOffset - offset);
m_section_table = table;
m_section_list = list;
}
/// <summary>