// Asura Engine chunk structure
// Used by Rebellion games: Sniper Elite, AVP 2010, etc.

type asura_chunk [display="Asura Chunk"] byteorder BE
{
    // Chunk header: 4-byte ID + 4-byte size + 4-byte version + 4-byte flags
    chunk_id = ascii(read(4));
    u32 chunk_size;
    u32 version;
    u32 flags;

    chunk_id = chunk_id [ui, readonly, display="Chunk ID"];
    chunk_size = chunk_size [ui, readonly, display="Chunk Size"];
    version = version [ui, readonly, display="Version"];
    flags = flags [ui, readonly, display="Flags"];

    // Calculate remaining data size
    data_size = chunk_size - 16;

    if (data_size > 0) {
        data = read(data_size);
        data = data [ui, display="Chunk Data"];
    }
}

type asura_fcsr_chunk [display="FCSR Resource Chunk"] byteorder BE
{
    // FCSR chunk header
    chunk_id = ascii(read(4));
    u32 chunk_size;
    u32 version;
    u32 flags;

    chunk_id = chunk_id [ui, readonly, display="Chunk ID"];
    chunk_size = chunk_size [ui, readonly, display="Chunk Size"];
    version = version [ui, readonly, display="Version"];
    flags = flags [ui, readonly, display="Flags"];

    // Resource info
    u32 resource_type;
    u32 unknown1;
    u32 resource_size;

    resource_type = resource_type [ui, readonly, display="Resource Type"];
    unknown1 = unknown1 [ui, readonly, display="Unknown1"];
    resource_size = resource_size [ui, readonly, display="Resource Size"];

    // Read null-terminated name
    name = cstring();
    name = name [ui, readonly, display="Resource Name"];
}

type asura_lfsr_chunk [display="LFSR List Resource Chunk"] byteorder BE
{
    // LFSR chunk header (list of file references)
    chunk_id = ascii(read(4));
    u32 chunk_size;
    u32 version;
    u32 flags;

    chunk_id = chunk_id [ui, readonly, display="Chunk ID"];
    chunk_size = chunk_size [ui, readonly, display="Chunk Size"];
    version = version [ui, readonly, display="Version"];
    flags = flags [ui, readonly, display="Flags"];

    // Number of entries
    u32 entry_count;
    entry_count = entry_count [ui, readonly, display="Entry Count"];
}

type asura_tsxt_chunk [display="TSXT Texture Set Chunk"] byteorder BE
{
    // TSXT chunk header (texture set)
    chunk_id = ascii(read(4));
    u32 chunk_size;
    u32 version;
    u32 flags;

    chunk_id = chunk_id [ui, readonly, display="Chunk ID"];
    chunk_size = chunk_size [ui, readonly, display="Chunk Size"];
    version = version [ui, readonly, display="Version"];
    flags = flags [ui, readonly, display="Flags"];

    // Texture count
    u32 texture_count;
    texture_count = texture_count [ui, readonly, display="Texture Count"];
}

type asura_stsa_chunk [display="STSA Asset List Chunk"] byteorder BE
{
    // STSA chunk header (asset list - reversed ASTS)
    chunk_id = ascii(read(4));
    u32 chunk_size;
    u32 version;
    u32 flags;

    chunk_id = chunk_id [ui, readonly, display="Chunk ID"];
    chunk_size = chunk_size [ui, readonly, display="Chunk Size"];
    version = version [ui, readonly, display="Version"];
    flags = flags [ui, readonly, display="Flags"];

    // File count
    u32 file_count;
    file_count = file_count [ui, readonly, display="File Count"];
}