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Diffstat (limited to 'CPP/7zip/Archive/Zip/ZipItem.h')
-rwxr-xr-x | CPP/7zip/Archive/Zip/ZipItem.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/CPP/7zip/Archive/Zip/ZipItem.h b/CPP/7zip/Archive/Zip/ZipItem.h new file mode 100755 index 00000000..765bfd85 --- /dev/null +++ b/CPP/7zip/Archive/Zip/ZipItem.h @@ -0,0 +1,191 @@ +// Archive/ZipItem.h + +#ifndef __ARCHIVE_ZIP_ITEM_H +#define __ARCHIVE_ZIP_ITEM_H + +#include "Common/Types.h" +#include "Common/String.h" +#include "Common/Buffer.h" + +#include "ZipHeader.h" + +namespace NArchive { +namespace NZip { + +struct CVersion +{ + Byte Version; + Byte HostOS; +}; + +bool operator==(const CVersion &v1, const CVersion &v2); +bool operator!=(const CVersion &v1, const CVersion &v2); + +struct CExtraSubBlock +{ + UInt16 ID; + CByteBuffer Data; +}; + +struct CWzAesExtraField +{ + UInt16 VendorVersion; // 0x0001 - AE-1, 0x0002 - AE-2, + // UInt16 VendorId; // "AE" + Byte Strength; // 1 - 128-bit , 2 - 192-bit , 3 - 256-bit + UInt16 Method; + + CWzAesExtraField(): VendorVersion(2), Strength(3), Method(0) {} + + bool NeedCrc() const { return (VendorVersion == 1); } + + bool ParseFromSubBlock(const CExtraSubBlock &sb) + { + if (sb.ID != NFileHeader::NExtraID::kWzAES) + return false; + if (sb.Data.GetCapacity() < 7) + return false; + const Byte *p = (const Byte *)sb.Data; + VendorVersion = (((UInt16)p[1]) << 8) | p[0]; + if (p[2] != 'A' || p[3] != 'E') + return false; + Strength = p[4]; + Method = (((UInt16)p[6]) << 16) | p[5]; + return true; + } + void SetSubBlock(CExtraSubBlock &sb) const + { + sb.Data.SetCapacity(7); + sb.ID = NFileHeader::NExtraID::kWzAES; + Byte *p = (Byte *)sb.Data; + p[0] = (Byte)VendorVersion; + p[1] = (Byte)(VendorVersion >> 8); + p[2] = 'A'; + p[3] = 'E'; + p[4] = Strength; + p[5] = (Byte)Method; + p[6] = (Byte)(Method >> 8); + } +}; + +struct CExtraBlock +{ + CObjectVector<CExtraSubBlock> SubBlocks; + void Clear() { SubBlocks.Clear(); } + size_t GetSize() const + { + size_t res = 0; + for (int i = 0; i < SubBlocks.Size(); i++) + res += SubBlocks[i].Data.GetCapacity() + 2 + 2; + return res; + } + bool GetWzAesField(CWzAesExtraField &aesField) const + { + // size_t res = 0; + for (int i = 0; i < SubBlocks.Size(); i++) + if (aesField.ParseFromSubBlock(SubBlocks[i])) + return true; + return false; + } + + bool HasWzAesField() const + { + CWzAesExtraField aesField; + return GetWzAesField(aesField); + } + + void RemoveUnknownSubBlocks() + { + for (int i = SubBlocks.Size() - 1; i >= 0;) + { + const CExtraSubBlock &subBlock = SubBlocks[i]; + if (subBlock.ID != NFileHeader::NExtraID::kWzAES) + SubBlocks.Delete(i); + else + i--; + } + } +}; + + +class CLocalItem +{ +public: + CVersion ExtractVersion; + UInt16 Flags; + UInt16 CompressionMethod; + UInt32 Time; + UInt32 FileCRC; + UInt64 PackSize; + UInt64 UnPackSize; + + AString Name; + + CExtraBlock LocalExtra; + + bool IsEncrypted() const; + + bool IsImplodeBigDictionary() const; + bool IsImplodeLiteralsOn() const; + + bool IsDirectory() const; + bool IgnoreItem() const { return false; } + UInt32 GetWinAttributes() const; + + bool HasDescriptor() const; + +private: + void SetFlagBits(int startBitNumber, int numBits, int value); + void SetBitMask(int bitMask, bool enable); +public: + void ClearFlags() { Flags = 0; } + void SetEncrypted(bool encrypted); + + WORD GetCodePage() const + { + return CP_OEMCP; + } +}; + +class CItem: public CLocalItem +{ +public: + CVersion MadeByVersion; + UInt16 InternalAttributes; + UInt32 ExternalAttributes; + + UInt64 LocalHeaderPosition; + + CExtraBlock CentralExtra; + CByteBuffer Comment; + + bool FromLocal; + bool FromCentral; + + bool IsDirectory() const; + UInt32 GetWinAttributes() const; + + bool IsThereCrc() const + { + if (CompressionMethod == NFileHeader::NCompressionMethod::kWzAES) + { + CWzAesExtraField aesField; + if (CentralExtra.GetWzAesField(aesField)) + return aesField.NeedCrc(); + } + return true; + } + + WORD GetCodePage() const + { + return (WORD)((MadeByVersion.HostOS == NFileHeader::NHostOS::kFAT + || MadeByVersion.HostOS == NFileHeader::NHostOS::kNTFS + ) ? CP_OEMCP : CP_ACP); + } + CItem() : FromLocal(false), FromCentral(false) {} +}; + +}} + +#endif + + |