BuildPatchDelta.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "Containers/UnrealString.h"
#include "CoreMinimal.h"
#include "HAL/Platform.h"
#include "Interfaces/IBuildManifest.h"
 
namespace BuildPatchServices
{
    enum class EDeltaPolicy : uint32
    {
        // Try to fetch, but continue without if request fail.
        TryFetchContinueWithout = 0,
 
        // Expect the delta to exist, hard fail the installation if it could not be retrieved.
        Expect,
 
        // Expect the delta to not exist, skipping any attempt to use one.
        Skip,
 
        InvalidOrMax
    };
 
    BUILDPATCHSERVICES_API FString GetChunkDeltaFilename(const IBuildManifestRef& SourceManifest, const IBuildManifestRef& DestinationManifest);
 
    BUILDPATCHSERVICES_API IBuildManifestPtr MergeDeltaManifest(const IBuildManifestRef& Manifest, const IBuildManifestRef& Delta);
}
 
static_assert((uint32)BuildPatchServices::EDeltaPolicy::InvalidOrMax == 3, "Please add support for the extra values to the Lex functions below.");
 
inline const TCHAR* LexToString(BuildPatchServices::EDeltaPolicy DeltaPolicy)
{
#define CASE_ENUM_TO_STR(Value) case BuildPatchServices::EDeltaPolicy::Value: return TEXT(#Value)
        switch (DeltaPolicy)
        {
        CASE_ENUM_TO_STR(TryFetchContinueWithout);
        CASE_ENUM_TO_STR(Expect);
        CASE_ENUM_TO_STR(Skip);
    default: return TEXT("InvalidOrMax");
        }
#undef CASE_ENUM_TO_STR
}
 
inline void LexFromString(BuildPatchServices::EDeltaPolicy& DeltaPolicy, const TCHAR* Buffer)
{
#define RETURN_IF_EQUAL(Value) if (FCString::Stricmp(Buffer, TEXT(#Value)) == 0) { DeltaPolicy = BuildPatchServices::EDeltaPolicy::Value; return; }
    const TCHAR* const Prefix = TEXT("EDeltaPolicy::");
    const SIZE_T PrefixLen = FCString::Strlen(Prefix);
    if (FCString::Strnicmp(Buffer, Prefix, PrefixLen) == 0)
    {
        Buffer += PrefixLen;
    }
    RETURN_IF_EQUAL(TryFetchContinueWithout);
    RETURN_IF_EQUAL(Expect);
    RETURN_IF_EQUAL(Skip);
    // Did not match
    DeltaPolicy = BuildPatchServices::EDeltaPolicy::InvalidOrMax;
#undef RETURN_IF_EQUAL
}