/// <summary>
/// Pack all files in folder to a CAMFile Object
/// </summary>
/// <param name="source"></param>
/// <returns></returns>
public static CAMFile Pack(string source)
{
var camFile = new CAMFile();
var extSections = Directory.GetFiles(source).GroupBy(p => Path.GetExtension(p)).Reverse().ToArray();
var sections = new CAMSection[extSections.Length];
var totalFileCount = 0;
var fileShift = 0;
for (int i = 0; i < extSections.Length; ++i)
{
var ext = extSections[i];
var section = new CAMSection();
var list = ext.ToArray();
section.IndexOffset = 12 + 4 + 4 + extSections.Length * 8 + i * 8 + fileShift * (20 + 4 + 4);
section.Extension = ext.Key.TrimStart('.');
section.FilesData = new CAMData[list.Length];
for (int j = 0; j < section.FilesData.Length; ++j)
{
var fs = new FileStream(list[j], FileMode.Open);
var data = new CAMData();
data.FileName = Path.GetFileNameWithoutExtension(list[j]);
data.Size = (int)fs.Length;
data.Data = new byte[fs.Length];
fs.Read(data.Data, 0, data.Size);
section.FilesData[j] = data;
++totalFileCount;
}
sections[i] = section;
fileShift += totalFileCount;
}
camFile.Sections = sections;
camFile.SectionCount = extSections.Length;
camFile.ContentOffset = extSections.Length * 8 + totalFileCount * (20 + 4 + 4); // SectionCount * 8(FileCount) + TotalFileCount * ( 20(text) + 4(offset) + 4(size) )
var fileSizeShift = 0;
foreach (var section in sections)
{
foreach (var fileData in section.FilesData)
{
fileData.Offset = camFile.ContentOffset + fileSizeShift;
fileSizeShift += fileData.Size;
}
}
return(camFile);
}
/// <summary>
/// Generate CAMFile object from a cam File
/// </summary>
/// <param name="fs"></param>
/// <returns></returns>
public static CAMFile Read(Stream fs)
{
using var reader = new BinaryReader(fs);
//Skip file header
reader.BaseStream.Seek(12, SeekOrigin.Begin);
var camFile = new CAMFile();
camFile.SectionCount = reader.ReadInt32(); // How many types.
camFile.ContentOffset = reader.ReadInt32(); // First file offset = 0x12(FileHeader) + 0x04(SectionCount) + 0x04(ContentOffset) + 0x04 * SectionCount + ContentOffset
camFile.Sections = new CAMSection[camFile.SectionCount];
for (int i = 0; i < camFile.Sections.Length; ++i)
{
var item = new CAMSection();
var code = reader.ReadBytes(4);
item.Extension = Encoding.ASCII.GetString(code);
item.IndexOffset = reader.ReadInt32();
camFile.Sections[i] = item;
}
for (int i = 0; i < camFile.Sections.Length; ++i)
{
var length = reader.ReadInt64(); // How many files with this Ext
camFile.Sections[i].FilesData = new CAMData[length];
for (int j = 0; j < length; ++j)
{
var item = new CAMData();
var code = reader.ReadBytes(20);// voodoo
item.FileName = Encoding.ASCII.GetString(code);
item.Offset = reader.ReadInt32();
item.Size = reader.ReadInt32();
var current = fs.Position;// save position
item.Data = new byte[item.Size];
fs.Seek(item.Offset, SeekOrigin.Begin);
fs.Read(item.Data, 0, item.Size);
fs.Seek(current, SeekOrigin.Begin);
camFile.Sections[i].FilesData[j] = item;
}
}
return(camFile);
}
