First

2024-07-02 18:12:23 +02:00
commit b344afa9fe
89 changed files with 10568 additions and 0 deletions
@@ -0,0 +1,158 @@
+#pragma once
+#include "tl/flag_set.h"
+#include "fs/Api.h"
+
+namespace fs
+{
+
+class FS_API ZipBase
+{
+public:
+	enum class GeneralBitFlag : uint16_t
+	{
+		Encrypted = 1 << 0,
+		CompressionMethodSpecific1 = 1 << 1,
+		CompressionMethodSpecific2 = 1 << 2,
+		DataDescriptorNeeded = 1 << 3,
+		StrongEncryption = 1 << 6,
+		LanguageEncodingFlag = 1 << 11,
+		LocalHeaderFieldsMasked = 1 << 13,
+	};
+	typedef tl::flag_set<GeneralBitFlag> GeneralBitFlags;
+
+	enum class CompressionMethod : uint16_t
+	{
+		Store = 0,
+		Shrunk = 1,
+		Reduced1 = 2,
+		Reduced2 = 3,
+		Reduced3 = 4,
+		Reduced4 = 5,
+		Implode = 6,
+		//Reserved = 7,
+		Deflate = 8,
+		Deflate64 = 9, 
+		PKWareImplode = 10,
+		//Reserved = 11,
+		BZip2 = 12,
+		//Reserved = 13,
+		LZMA = 14,
+		//Reserved = 15,
+		//Reserved = 16,
+		//Reserved = 17,
+		Terse = 18,
+		LZ77 = 19,
+
+		LZ4 = 20, // non-standard
+		ZStd = 21, // non-standard
+
+		WavPack = 97,
+		PPMd = 98,
+	};
+
+protected:
+	//////////////////////////////////////////////////////////////////////////
+	//These structs follow pretty closely the https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT standard
+
+#pragma pack(push, 1)
+
+	struct LocalFileHeader
+	{
+		static constexpr uint32_t k_signature = 0x04034b50u;
+		uint32_t signature = k_signature;
+		uint16_t versionNeededToExtract = 0;
+		uint16_t generalBitFlag = 0;
+		uint16_t compressionMethod = 0;
+		uint16_t lastModFileTime = 0;
+		uint16_t lastModFileDate = 0;
+		uint32_t crc32 = 0;
+		uint32_t compressedSize = 0;
+		uint32_t uncompressedSize = 0;
+		uint16_t filenameLength = 0;
+		uint16_t extraFieldLength = 0;
+	};
+
+	struct DataDescriptor
+	{
+		uint32_t crc32 = 0;
+		uint32_t compressedSize = 0;
+		uint32_t uncompressedSize = 0;
+	};
+
+	struct CentralDirectoryFileHeader
+	{
+		static constexpr uint32_t k_signature = 0x02014b50u;
+		uint32_t signature = k_signature;
+		uint16_t versionMadeBy = 0;
+		uint16_t versionNeededToExtract = 0;
+		uint16_t generalBitFlag = 0;
+		uint16_t compressionMethod = 0;
+		uint16_t lastModFileTime = 0;
+		uint16_t lastModFileDate = 0;
+		uint32_t crc32 = 0;
+		uint32_t compressedSize = 0;
+		uint32_t uncompressedSize = 0;
+		uint16_t filenameLength = 0;
+		uint16_t extraFieldLength = 0;
+		uint16_t fileCommentLength = 0;
+		uint16_t diskNumberStart = 0;
+		uint16_t internalFileAttributes = 0;
+		uint32_t externalFileAttributes = 0;
+		uint32_t localHeaderOffset = 0;
+	};
+
+	struct EndOfCentralDirectoryRecord
+	{
+		static constexpr uint32_t k_signature = 0x06054b50u;
+		uint32_t signature = k_signature;
+		uint16_t diskNumber = 0;
+		uint16_t centralDirectoryStartDiskNumber = 0;
+		uint16_t centralDirectoryRecordCountOnThisDisk = 0;
+		uint16_t centralDirectoryRecordCount = 0;
+		uint32_t centralDirectorySize = 0;
+		uint32_t centralDirectoryOffset = 0;
+		uint16_t zipFileCommentLength = 0;
+	};
+
+	struct ExtendedInformationExtraField64
+	{
+		static constexpr uint32_t k_tag = 0x0001;
+		uint16_t tag = k_tag;
+		uint16_t size = 0;
+		uint64_t originalSize = 0;
+		uint64_t compressedSize = 0;
+		uint64_t localHeaderOffset = 0;
+		uint32_t diskNumber = 0;
+	};
+
+	struct EndOfCentralDirectoryRecord64
+	{
+		static constexpr uint32_t k_signature = 0x06064b50u;
+		uint32_t signature = k_signature;
+		uint64_t endOfCentralDirectorySize = 0;
+		uint16_t versionMadeBy = 0;
+		uint16_t versionNeededToExtract = 0;
+		uint32_t diskNumber = 0;
+		uint32_t centralDirectoryStartDiskNumber = 0;
+		uint64_t centralDirectoryRecordCountOnThisDisk = 0;
+		uint64_t centralDirectoryRecordCount = 0;
+		uint64_t centralDirectorySize = 0;
+		uint64_t centralDirectoryOffset = 0;
+	};
+
+	struct EndOfCentralDirectoryLocator64
+	{
+		static constexpr uint32_t k_signature = 0x07064b50u;
+		uint32_t signature = k_signature;
+		uint32_t centralDirectoryStartDiskNumber = 0;
+		uint64_t endOfCentralDirectoryRecordOffset = 0;
+		uint32_t diskCount = 0;
+	};
+
+#pragma pack(pop)
+
+	static void computeMsDosTime(time_t time, uint16_t& o_date, uint16_t& o_time);
+	static CentralDirectoryFileHeader computeCentralDirectoryFileHeader(const LocalFileHeader& header, bool zip64);
+};
+
+}