paul chipchase f5c7921948 Add support for generating OnDemandToc data from UToc files on disk rather than downloading the data each time the process is launched. This feature is off by default. ...

#rb PJ.Kack, Per.Larsson
#rnx

### Configuration

- New cvar 's.IasGenerateOnDemandUtoc' which when set to true will tell the IasBackend to generate the OnDemand toc file from all of the utoc files marked as supporting OnDemand currently on disk. Defaults to false.
-- When we ship the IAS feature this will be changed to true.
- Note that both cvars are used before '-dpcvars' is applied so cannot be overriden from the cmdline.
- When UE_VALIDATE_GENERATED_TOC is enabled we will download the ondemand toc from the CDN anyway and check that the generated version from disk has the same values (where important) and trigger an assert if there are differences. This is intended to help debugging future compatibility issues.

## IoDispatcher Changes

- Add new method FIoStoreReader::GetChunkCompressedInfo allowing the caller to get info about a compressed chunk without actually loading it from disk.
- Changed FIoStoreReader::Initialize to take a string view rather than raw string pointer.
- FIoStoreTocResource now has an array of meta data for chunks and another for blocks, specifically for IAS (FIoStoreTocResource::OnDemandChunkMeta/OnDemandCompressedBlockMeta)
-- This data will only be generated for utoc files with OnDemand support to avoid bloating the non-ondemand utocs.
-- This data is considered meta data and will be read when EIoStoreTocReadOptions::ReadTocMeta is enabled.
- Reordered some includes to match the IWYU tool.
- Minor optimization to FIoStoreToc::Initialize

### IAS Changes

- The IoStoreOnDemand module now includes the 'Pak'File' module so that we have access to the pak directories.
- Add FEncryptionKeyManager::GetAllKeys which would be needed if IAS data ends up being encrypted.
-- The encryption path has not yet been tested and probably will need some form of defered mounting (for cases where the encryption keys are applied at a later point)

[CL 28039592 by paul chipchase in ue5-main branch]

2023-09-20 12:06:29 -04:00

..

IO

Add support for generating OnDemandToc data from UToc files on disk rather than downloading the data each time the process is launched. This feature is off by default.

2023-09-20 12:06:29 -04:00

Misc

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