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/*****************************************************************************/
/* CascStructs.h Copyright (c) Ladislav Zezula 2019 */
/*---------------------------------------------------------------------------*/
/* On-disk structures for CASC storages */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 28.04.19 1.00 Lad The first version of CascStructs.h */
/*****************************************************************************/
#ifndef __CASC_STRUCTS_H__
#define __CASC_STRUCTS_H__
//-----------------------------------------------------------------------------
// Common definitions
#define CASC_INDEX_COUNT 0x10 // Number of index files
#define CASC_CKEY_SIZE 0x10 // Size of the content key
#define CASC_EKEY_SIZE 0x09 // Size of the encoded key
#define CASC_MAX_DATA_FILES 0x100 // Maximum number of data files
//-----------------------------------------------------------------------------
// The index files structures
#define FILE_INDEX_PAGE_SIZE 0x200 // Number of bytes in one page of EKey items
// Structure describing the 32-bit block size and 32-bit Jenkins hash of the block
typedef struct _BLOCK_SIZE_AND_HASH
{
DWORD cbBlockSize;
DWORD dwBlockHash;
} BLOCK_SIZE_AND_HASH, *PBLOCK_SIZE_AND_HASH;
// Checksum describing a block in the index file (v2)
typedef struct _FILE_INDEX_GUARDED_BLOCK
{
DWORD BlockSize;
DWORD BlockHash;
} FILE_INDEX_GUARDED_BLOCK, *PFILE_INDEX_GUARDED_BLOCK;
// Structure of the header of the index files version 1
typedef struct _FILE_INDEX_HEADER_V1
{
USHORT IndexVersion; // Must be 0x05
BYTE BucketIndex; // The bucket index of this file; should be the same as the first byte of the hex filename.
BYTE align_3;
DWORD field_4;
ULONGLONG field_8;
ULONGLONG SegmentSize; // Size of one data segment (aka data.### file)
BYTE EncodedSizeLength; // Length, in bytes, of the EncodedSize in the EKey entry
BYTE StorageOffsetLength; // Length, in bytes, of the StorageOffset field in the EKey entry
BYTE EKeyLength; // Length of the encoded key (bytes)
BYTE FileOffsetBits; // Number of bits of the archive file offset in StorageOffset field. Rest is data segment index
DWORD EKeyCount1;
DWORD EKeyCount2;
DWORD KeysHash1;
DWORD KeysHash2;
DWORD HeaderHash;
} FILE_INDEX_HEADER_V1, *PFILE_INDEX_HEADER_V1;
typedef struct _FILE_INDEX_HEADER_V2
{
USHORT IndexVersion; // Must be 0x07
BYTE BucketIndex; // The bucket index of this file; should be the same as the first byte of the hex filename.
BYTE ExtraBytes; // Unknown; must be 0
BYTE EncodedSizeLength; // Length, in bytes, of the EncodedSize in the EKey entry
BYTE StorageOffsetLength; // Length, in bytes, of the StorageOffset field in the EKey entry
BYTE EKeyLength; // Length of the encoded key (bytes)
BYTE FileOffsetBits; // Number of bits of the archive file offset in StorageOffset field. Rest is data segment index
ULONGLONG SegmentSize; // Size of one data segment (aka data.### file)
} FILE_INDEX_HEADER_V2, *PFILE_INDEX_HEADER_V2;
// The EKey entry from the ".idx" files. Note that the lengths are optional and controlled by the FILE_INDEX_HEADER_Vx
typedef struct _FILE_EKEY_ENTRY
{
BYTE EKey[CASC_EKEY_SIZE]; // The first 9 bytes of the encoded key
BYTE FileOffsetBE[5]; // Index of data file and offset within (big endian).
BYTE EncodedSize[4]; // Encoded size (big endian). This is the size of encoded header, all file frame headers and all file frames
} FILE_EKEY_ENTRY, *PFILE_EKEY_ENTRY;
//-----------------------------------------------------------------------------
// The archive index (md5.index) files structures
// https://wowdev.wiki/TACT#CDN_File_Organization
template <int CHKSUM_LENGTH>
struct FILE_INDEX_FOOTER
{
BYTE TocHash[MD5_HASH_SIZE]; // Client tries to read with 0x10, then backs off in size when smaller
BYTE Version; // Version of the index header
BYTE Reserved[2]; // Length, in bytes, of the file offset field
BYTE PageSizeKB; // Length, in kilobytes, of the index page
BYTE OffsetBytes; // Normally 4 for archive indices, 6 for group indices, and 0 for loose file indices
BYTE SizeBytes; // Normally 4
BYTE EKeyLength; // Normally 16
BYTE FooterHashBytes; // Normally 8, <= 0x10
BYTE ElementCount[4]; // BigEndian in _old_ versions (e.g. 18179)
BYTE FooterHash[CHKSUM_LENGTH];
};
//-----------------------------------------------------------------------------
// The ENCODING manifest structures
//
// The ENCODING file is in the form of:
// * File header. Fixed length.
// * Encoding Specification (ESpec) in the string form. Length is stored in FILE_ENCODING_HEADER::ESpecBlockSize
// https://wowdev.wiki/CASC#Encoding
// https://wowdev.wiki/TACT#Encoding_table
//
#define FILE_MAGIC_ENCODING 0x4E45 // 'EN'
// File header of the ENCODING manifest
typedef struct _FILE_ENCODING_HEADER
{
USHORT Magic; // FILE_MAGIC_ENCODING ('EN')
BYTE Version; // Expected to be 1 by CascLib
BYTE CKeyLength; // The content key length in ENCODING file. Usually 0x10
BYTE EKeyLength; // The encoded key length in ENCODING file. Usually 0x10
BYTE CKeyPageSize[2]; // Size of the CKey page, in KB (big-endian)
BYTE EKeyPageSize[2]; // Size of the EKey page, in KB (big-endian)
BYTE CKeyPageCount[4]; // Number of CKey pages in the table (big endian)
BYTE EKeyPageCount[4]; // Number of EKey pages in the table (big endian)
BYTE field_11; // Asserted to be zero by the agent
BYTE ESpecBlockSize[4]; // Size of the ESpec string block
} FILE_ENCODING_HEADER, *PFILE_ENCODING_HEADER;
// Page header of the ENCODING manifest
typedef struct _FILE_CKEY_PAGE
{
BYTE FirstKey[MD5_HASH_SIZE]; // The first CKey/EKey in the segment
BYTE SegmentHash[MD5_HASH_SIZE]; // MD5 hash of the entire segment
} FILE_CKEY_PAGE, *PFILE_CKEY_PAGE;
// Single entry in the page
typedef struct _FILE_CKEY_ENTRY
{
USHORT EKeyCount; // Number of EKeys
BYTE ContentSize[4]; // Content file size (big endian)
BYTE CKey[CASC_CKEY_SIZE]; // Content key. This is MD5 of the file content
BYTE EKey[CASC_CKEY_SIZE]; // Encoded key. This is (trimmed) MD5 hash of the file header, containing MD5 hashes of all the logical blocks of the file
} FILE_CKEY_ENTRY, *PFILE_CKEY_ENTRY;
typedef struct _FILE_ESPEC_ENTRY
{
BYTE ESpecKey[MD5_HASH_SIZE]; // The ESpec key of the file
BYTE ESpecIndexBE[4]; // Index of ESPEC entry, assuming zero-terminated strings (big endian)
BYTE FileSizeBE[5]; // Size of the encoded version of the file (big endian)
} FILE_ESPEC_ENTRY, *PFILE_ESPEC_ENTRY;
//-----------------------------------------------------------------------------
// The DOWNLOAD manifest structures
//
// See https://wowdev.wiki/TACT#Download_manifest
//
#define FILE_MAGIC_DOWNLOAD 0x4C44 // 'DL'
// File header of the DOWNLOAD manifest
typedef struct _FILE_DOWNLOAD_HEADER
{
USHORT Magic; // FILE_MAGIC_DOWNLOAD ('DL')
BYTE Version; // Expected to be 1 by CascLib
BYTE EKeyLength; // The content key length in DOWNLOAD file. Expected to be 0x10
BYTE EntryHasChecksum; // If nonzero, then the entry has checksum.
BYTE EntryCount[4]; // Number of entries (big-endian)
BYTE TagCount[2]; // Number of tag entries (big endian)
// Version 2 or newer
BYTE FlagByteSize; // Number of flag bytes
// Verion 3 or newer
BYTE BasePriority;
BYTE Unknown2[3];
} FILE_DOWNLOAD_HEADER, *PFILE_DOWNLOAD_HEADER;
typedef struct _FILE_DOWNLOAD_ENTRY
{
BYTE EKey[MD5_HASH_SIZE]; // Encoding key (variable length)
BYTE FileSize[5]; // File size
BYTE Priority;
// DWORD Checksum [optional]
// BYTE Flags;
} FILE_DOWNLOAD_ENTRY, *PFILE_DOWNLOAD_ENTRY;
//-----------------------------------------------------------------------------
// The INSTALL manifest structures
//
// See https://wowdev.wiki/TACT#Install_manifest
//
#define FILE_MAGIC_INSTALL 0x4E49 // 'IN'
// File header of the INSTALL manifest
typedef struct _FILE_INSTALL_HEADER
{
USHORT Magic; // FILE_MAGIC_INSTALL ('DL')
BYTE Version; // Expected to be 1 by CascLib
BYTE EKeyLength; // The content key length in INSTALL file. Expected to be 0x10
BYTE TagCount[2]; // Number of tag entries (big endian)
BYTE EntryCount[4]; // Number of entries (big-endian)
} FILE_INSTALL_HEADER, *PFILE_INSTALL_HEADER;
//-----------------------------------------------------------------------------
// Data file structures
#define BLTE_HEADER_SIGNATURE 0x45544C42 // 'BLTE' header in the data files
#define BLTE_HEADER_DELTA 0x1E // Distance of BLTE header from begin of the header area
#define MAX_ENCODED_HEADER 0x1000 // Starting size for the frame headers
typedef struct _BLTE_HEADER
{
BYTE Signature[4]; // Must be "BLTE"
BYTE HeaderSize[4]; // Header size in bytes (big endian)
BYTE MustBe0F; // Must be 0x0F. Optional, only if HeaderSize != 0
BYTE FrameCount[3]; // Frame count (big endian). Optional, only if HeaderSize != 0
} BLTE_HEADER, *PBLTE_HEADER;
typedef struct _BLTE_ENCODED_HEADER
{
// Header span.
ENCODED_KEY EKey; // Encoded key of the data beginning with "BLTE" (byte-reversed)
DWORD EncodedSize; // Encoded size of the data data beginning with "BLTE" (little endian)
BYTE field_14; // Seems to be 1 if the header span has no data
BYTE field_15; // Hardcoded to zero (Agent.exe 2.15.0.6296: 01370000->0148E2AA)
BYTE JenkinsHash[4]; // Jenkins hash (hashlittle2) of the preceding fields (EKey + EncodedSize + field_14 + field_15) (little endian)
BYTE Checksum[4]; // Checksum of the previous part. See "VerifyHeaderSpan()" for more information.
// BLTE header. Always present.
BYTE Signature[4]; // Must be "BLTE"
BYTE HeaderSize[4]; // Header size in bytes (big endian)
BYTE MustBe0F; // Must be 0x0F. Optional, only if HeaderSize != 0
BYTE FrameCount[3]; // Frame count (big endian). Optional, only if HeaderSize != 0
} BLTE_ENCODED_HEADER, *PBLTE_ENCODED_HEADER;
typedef struct _BLTE_FRAME
{
BYTE EncodedSize[4]; // Encoded frame size (big endian)
BYTE ContentSize[4]; // Content frame size (big endian)
CONTENT_KEY FrameHash; // Hash of the encoded frame
} BLTE_FRAME, *PBLTE_FRAME;
#endif // __CASC_STRUCTS_H__
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