Android apps using directly or indirectly OpenGL cache compiled shaders into com.android.opengl.shaders_cache file.
This page hosts a formal specification of com.android.opengl.shaders_cache file using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for C# generated by Kaitai Struct depends on the C# runtime library. You have to install it before you can parse data.
The C# runtime library is available in the NuGet Gallery. Installation instructions can also be found there.
Parse a local file and get structure in memory:
var data = AndroidOpenglShadersCache.FromFile("path/to/local/file.bin");
Or parse structure from a byte array:
byte[] someArray = new byte[] { ... };
var data = new AndroidOpenglShadersCache(new KaitaiStream(someArray));
After that, one can get various attributes from the structure by accessing properties like:
data.Crc32 // => crc32 of `contents`
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
using System.Collections.Generic;
namespace Kaitai
{
/// <summary>
/// Android apps using directly or indirectly OpenGL cache compiled shaders
/// into com.android.opengl.shaders_cache file.
/// </summary>
/// <remarks>
/// Reference: <a href="https://android.googlesource.com/platform/frameworks/native/+/master/opengl/libs/EGL/FileBlobCache.cpp">Source</a>
/// </remarks>
public partial class AndroidOpenglShadersCache : KaitaiStruct
{
public static AndroidOpenglShadersCache FromFile(string fileName)
{
return new AndroidOpenglShadersCache(new KaitaiStream(fileName));
}
public AndroidOpenglShadersCache(KaitaiStream p__io, KaitaiStruct p__parent = null, AndroidOpenglShadersCache p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root ?? this;
_read();
}
private void _read()
{
_magic = m_io.ReadBytes(4);
if (!((KaitaiStream.ByteArrayCompare(Magic, new byte[] { 69, 71, 76, 36 }) == 0)))
{
throw new ValidationNotEqualError(new byte[] { 69, 71, 76, 36 }, Magic, M_Io, "/seq/0");
}
_crc32 = m_io.ReadU4le();
__raw_contents = m_io.ReadBytesFull();
var io___raw_contents = new KaitaiStream(__raw_contents);
_contents = new Cache(io___raw_contents, this, m_root);
}
public partial class Alignment : KaitaiStruct
{
public static Alignment FromFile(string fileName)
{
return new Alignment(new KaitaiStream(fileName));
}
public Alignment(KaitaiStream p__io, KaitaiStruct p__parent = null, AndroidOpenglShadersCache p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root;
_read();
}
private void _read()
{
_alignment = m_io.ReadBytes(((M_Io.Pos + 3) & (~3 - M_Io.Pos)));
}
private byte[] _alignment;
private AndroidOpenglShadersCache m_root;
private KaitaiStruct m_parent;
/// <summary>
/// garbage from memory
/// </summary>
public byte[] Alignment { get { return _alignment; } }
public AndroidOpenglShadersCache M_Root { get { return m_root; } }
public KaitaiStruct M_Parent { get { return m_parent; } }
}
public partial class PrefixedString : KaitaiStruct
{
public static PrefixedString FromFile(string fileName)
{
return new PrefixedString(new KaitaiStream(fileName));
}
public PrefixedString(KaitaiStream p__io, AndroidOpenglShadersCache.Cache p__parent = null, AndroidOpenglShadersCache p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root;
_read();
}
private void _read()
{
_lenStr = m_io.ReadU4le();
_str = System.Text.Encoding.GetEncoding("ascii").GetString(KaitaiStream.BytesTerminate(m_io.ReadBytes(LenStr), 0, false));
_alignment = new Alignment(m_io, this, m_root);
}
private uint _lenStr;
private string _str;
private Alignment _alignment;
private AndroidOpenglShadersCache m_root;
private AndroidOpenglShadersCache.Cache m_parent;
public uint LenStr { get { return _lenStr; } }
public string Str { get { return _str; } }
public Alignment Alignment { get { return _alignment; } }
public AndroidOpenglShadersCache M_Root { get { return m_root; } }
public AndroidOpenglShadersCache.Cache M_Parent { get { return m_parent; } }
}
/// <remarks>
/// Reference: <a href="https://android.googlesource.com/platform/frameworks/native/+/master/opengl/libs/EGL/BlobCache.cpp">Source</a>
/// </remarks>
public partial class Cache : KaitaiStruct
{
public static Cache FromFile(string fileName)
{
return new Cache(new KaitaiStream(fileName));
}
public Cache(KaitaiStream p__io, AndroidOpenglShadersCache p__parent = null, AndroidOpenglShadersCache p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root;
_read();
}
private void _read()
{
_magic = m_io.ReadBytes(4);
if (!((KaitaiStream.ByteArrayCompare(Magic, new byte[] { 36, 98, 66, 95 }) == 0)))
{
throw new ValidationNotEqualError(new byte[] { 36, 98, 66, 95 }, Magic, M_Io, "/types/cache/seq/0");
}
_version = m_io.ReadU4le();
_deviceVersion = m_io.ReadU4le();
_numEntries = m_io.ReadU4le();
if (Version >= 3) {
_buildId = new PrefixedString(m_io, this, m_root);
}
_entries = new List<Entry>();
for (var i = 0; i < NumEntries; i++)
{
_entries.Add(new Entry(m_io, this, m_root));
}
}
public partial class Entry : KaitaiStruct
{
public static Entry FromFile(string fileName)
{
return new Entry(new KaitaiStream(fileName));
}
public Entry(KaitaiStream p__io, AndroidOpenglShadersCache.Cache p__parent = null, AndroidOpenglShadersCache p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root;
_read();
}
private void _read()
{
_lenKey = m_io.ReadU4le();
_lenValue = m_io.ReadU4le();
_key = m_io.ReadBytes(LenKey);
_value = m_io.ReadBytes(LenValue);
_alignment = new Alignment(m_io, this, m_root);
}
private uint _lenKey;
private uint _lenValue;
private byte[] _key;
private byte[] _value;
private Alignment _alignment;
private AndroidOpenglShadersCache m_root;
private AndroidOpenglShadersCache.Cache m_parent;
public uint LenKey { get { return _lenKey; } }
public uint LenValue { get { return _lenValue; } }
public byte[] Key { get { return _key; } }
public byte[] Value { get { return _value; } }
public Alignment Alignment { get { return _alignment; } }
public AndroidOpenglShadersCache M_Root { get { return m_root; } }
public AndroidOpenglShadersCache.Cache M_Parent { get { return m_parent; } }
}
private byte[] _magic;
private uint _version;
private uint _deviceVersion;
private uint _numEntries;
private PrefixedString _buildId;
private List<Entry> _entries;
private AndroidOpenglShadersCache m_root;
private AndroidOpenglShadersCache m_parent;
public byte[] Magic { get { return _magic; } }
public uint Version { get { return _version; } }
public uint DeviceVersion { get { return _deviceVersion; } }
public uint NumEntries { get { return _numEntries; } }
public PrefixedString BuildId { get { return _buildId; } }
public List<Entry> Entries { get { return _entries; } }
public AndroidOpenglShadersCache M_Root { get { return m_root; } }
public AndroidOpenglShadersCache M_Parent { get { return m_parent; } }
}
private byte[] _magic;
private uint _crc32;
private Cache _contents;
private AndroidOpenglShadersCache m_root;
private KaitaiStruct m_parent;
private byte[] __raw_contents;
public byte[] Magic { get { return _magic; } }
/// <summary>
/// crc32 of `contents`
/// </summary>
public uint Crc32 { get { return _crc32; } }
public Cache Contents { get { return _contents; } }
public AndroidOpenglShadersCache M_Root { get { return m_root; } }
public KaitaiStruct M_Parent { get { return m_parent; } }
public byte[] M_RawContents { get { return __raw_contents; } }
}
}