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DETERMINE BASE SIZE OF STRUCTURE WORLD EDITOR WARCRAFT 3 UPDATE
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after the terminator block, the file is additionally padded to 16,384 bytesĮxample file path: INSTALL_DIR\Data\data\0e00000054.idx.

DETERMINE BASE SIZE OF STRUCTURE WORLD EDITOR WARCRAFT 3 FREE

the free space block has an entry count of zero but is still padded to 1090 entries as usual.

This is misleading: it is still at 340, and the free space block is found at that offset, not at offset 4,096 (340 is indicated by the block size field of the 1st block)

the first block type is set to 5 (instead of 4) with the same layout.

It seems that the client only writes a template file without free space entries and lets the game later complete the file.

DETERMINE BASE SIZE OF STRUCTURE WORLD EDITOR WARCRAFT 3 UPDATE

There is a special case after a game update by the Battle.Net client. The position within the data file where the unused bytes are located. The number of the data file where the unused bytes are located. If there are fewer, the rest of the area is padded. There can be up to 1090 entries of these.

This is the position of the unused bytes.

This is always set to 0 in this part of the block. Each of the two parts will always be 5450 bytes, so if there are fewer than 1090 entries, the rest of the bytes will be padded with '\0'.Ī value indicating what type of block this is. The second part contains entries with the position of the unused bytes. The first part contains entries with the number of unused bytes. IDX filename.Īfter a small header, this structure is split up into two equal parts.

Followed by a number of these entries.

The count can be calculated like this: (NextBlock - 264 - idxFileCount * 4) / 8

When the file is written by the game, it is a relative path (relative from the game executable).

When the file is written by the Battle.Net client, it is an absolute path.

The path uses forward slashes (except the prefix).

If the type is 5, then the free space block contains no entries.

For this block, the value is either 4 or 5. The file is recreated every time a client is started.Ī value indicating what type of block this is. IDX files, and which areas of the data files have unused space. This file contains the path where the data files are stored, which is the current version of each of the. The shared memory file is called 'shmem' and is usually located in the same folder as the data and. It places those four parameters into journal files with the extension '.idx'. The program will record the content hash ( BLTE-compressed hash), size, and position of the file as well as the number of the data file that it is in. It stores the downloaded data fragments in data files in "INSTALL_DIR\Data\data\".

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While many parts of the file system are identical between v1 and v2, there are enough changes to make explaining both formats at once inadvisable.ĭuring the installation process for a Blizzard game, the program will download the required files as requested by root, encoding, download, and install. The remainder of this article will refer exclusively to the system called CASC v2 as 'CASC'. CASC v2 does not, and requires the user to provide names. Essentially CASC v1 has its own listfile (in root). Translating name hashes to file names requires use of the Jenkins Hash function, which in turn requires a listfile to generate the hashes. CASC v2's Root file relates content hashes to name hashes. CASC v1's Root file relates content hashes to file names.This system is completely removed in CASC v2. These packages all have the same root folder, and if all of the files are not properly added with the package's base directory, the extraction process will produce an incredibly mangled directory output. Sections of CASC v1 data files are grouped together in collections of files we call "packages".These are the two most substantial changes between CASC v1 and CASC v2: In contrast, World of Warcraft's "build-playbuild-installer" config line clearly states it is generated by "ngdptool_casc2" (NGDP stands for Next Generation Download Procotol). The form of CASC that Heroes of the Storm uses is designated by Blizzard as "CASC". The CASC file system made its first debut in the Heroes of the Storm Technical Alpha, which was hosted on Blizzard's servers in late January. 2.1.2 Shared Memory Free Space Structure.