122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
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// Georgy Treshchev 2024.
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#pragma once
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#include "Engine/EngineBaseTypes.h"
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#include "Misc/EngineVersionComparison.h"
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#include "Misc/CString.h"
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// On UE < 5.0, UTF-8 characters are not supported, so we should at least use ANSI characters
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#if UE_VERSION_OLDER_THAN(5, 0, 0)
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using RA_UTF8CHAR = ANSICHAR;
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#else
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using RA_UTF8CHAR = UTF8CHAR;
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#endif
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class FTarChecksumHelper;
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struct FRuntimeArchiveEntry;
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/**
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* Tar header used to denote archived data
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*/
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struct FTarHeader
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{
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friend FTarChecksumHelper;
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FTarHeader();
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private:
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/** Entry name */
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RA_UTF8CHAR Name[100 / sizeof(RA_UTF8CHAR)];
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/** Permission bits */
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ANSICHAR Mode[8];
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/** Owner user ID (UID) */
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ANSICHAR Owner[8];
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/** Group ID (GID) */
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ANSICHAR Group[8];
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/** Size in bytes */
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ANSICHAR Size[12];
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/** Time of last modification */
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ANSICHAR Time[12];
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/** Sum of all bytes in the header block */
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ANSICHAR Checksum[8];
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/** Entry type (e.g. directory or file) */
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ANSICHAR TypeFlag;
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/** Name of target file name. Not used, but denotes some rarely used entry types */
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ANSICHAR LinkName[100];
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/** Unused padding */
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ANSICHAR Padding[255];
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// TODO: Replace Padding with additional fields (Magic, Version, UName, GName, DevMajor, DevMinor, Prefix) for better compatibility
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public:
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/**
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* Convert a tar header to an archive entry
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*
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* @param Header Tar header to convert from
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* @param Index Tar header index
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* @param Entry Filled archive entry
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* @return Whether the conversion was successful or not
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*/
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static bool ToEntry(const FTarHeader& Header, int32 Index, FRuntimeArchiveEntry& Entry);
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/**
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* Convert an archive entry to a tar header
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*
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* @param Entry Archive entry to convert from
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* @param Header Filled tar header
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* @return Whether the conversion was successful or not
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*/
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static bool FromEntry(const FRuntimeArchiveEntry& Entry, FTarHeader& Header);
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/**
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* Generate tar header based on input
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*
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* @param Name Entry name
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* @param Size Data size
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* @param CreationTime Entry creation time
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* @param bIsDirectory Whether the entry is a directory or a file
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* @param Header Filled tar header
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* @return Whether the conversion was successful or not
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*/
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static bool GenerateHeader(const FString& Name, int64 Size, const FDateTime& CreationTime, bool bIsDirectory, FTarHeader& Header);
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//~ Writing and reading tar header data
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const RA_UTF8CHAR* GetName() const;
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bool SetName(const RA_UTF8CHAR* InName);
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uint32 GetMode() const;
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void SetMode(uint32 InMode);
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uint32 GetOwner() const;
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void SetOwner(uint32 InOwner);
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const ANSICHAR* GetGroup() const;
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bool SetGroup(const ANSICHAR* InGroup);
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int64 GetSize() const;
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void SetSize(int64 InSize);
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int64 GetTime() const;
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void SetTime(int64 InTime);
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uint32 GetChecksum() const;
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void SetChecksum(uint32 InChecksum);
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ANSICHAR GetTypeFlag() const;
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void SetTypeFlag(ANSICHAR InTypeFlag);
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const ANSICHAR* GetLinkName() const;
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bool SetLinkName(const ANSICHAR* InLinkName);
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};
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