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romkazvo
2023-08-07 19:29:24 +08:00
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CrySystem/ZipFileFormat.h Normal file
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// declarations of control structures in Zip File
#ifndef _ZIP_FILE_FORMAT_HDR_
#define _ZIP_FILE_FORMAT_HDR_
#if !defined(LINUX)
#pragma pack(push)
#pragma pack(1)
#define PACK_GCC
#else
#define PACK_GCC __attribute__ ((packed))
#endif
namespace ZipFile
{
typedef unsigned int ulong;
typedef unsigned short ushort;
// General-purpose bit field flags
enum {
GPF_ENCRYPTED = 1, // If set, indicates that the file is encrypted.
GPF_DATA_DESCRIPTOR = 1 << 3, // if set, the CRC32 and sizes aren't set in the file header, but only in the data descriptor following compressed data
GPF_RESERVED_8_ENHANCED_DEFLATING = 1 << 4, // Reserved for use with method 8, for enhanced deflating.
GPF_COMPRESSED_PATCHED = 1 << 5, // the file is compressed patched data
};
// compression methods
enum {
METHOD_STORE = 0, // The file is stored (no compression)
METHOD_SHRINK = 1, // The file is Shrunk
METHOD_REDUCE_1 = 2, // The file is Reduced with compression factor 1
METHOD_REDUCE_2 = 3, // The file is Reduced with compression factor 2
METHOD_REDUCE_3 = 4, // The file is Reduced with compression factor 3
METHOD_REDUCE_4 = 5, // The file is Reduced with compression factor 4
METHOD_IMPLODE = 6, // The file is Imploded
METHOD_TOKENIZE = 7, // Reserved for Tokenizing compression algorithm
METHOD_DEFLATE = 8, // The file is Deflated
METHOD_DEFLATE64 = 9, // Enhanced Deflating using Deflate64(tm)
METHOD_IMPLODE_PKWARE = 10// PKWARE Date Compression Library Imploding
};
// end of Central Directory Record
// followed by the .zip file comment (variable size, can be empty, obtained from nCommentLength)
struct CDREnd
{
enum {SIGNATURE = 0x06054b50};
ulong lSignature; // end of central dir signature 4 bytes (0x06054b50)
ushort nDisk; // number of this disk 2 bytes
ushort nCDRStartDisk; // number of the disk with the start of the central directory 2 bytes
ushort numEntriesOnDisk; // total number of entries in the central directory on this disk 2 bytes
ushort numEntriesTotal; // total number of entries in the central directory 2 bytes
ulong lCDRSize; // size of the central directory 4 bytes
ulong lCDROffset; // offset of start of central directory with respect to the starting disk number 4 bytes
ushort nCommentLength; // .ZIP file comment length 2 bytes
// .ZIP file comment (variable size, can be empty) follows
} PACK_GCC;
// This descriptor exists only if bit 3 of the general
// purpose bit flag is set (see below). It is byte aligned
// and immediately follows the last byte of compressed data.
// This descriptor is used only when it was not possible to
// seek in the output .ZIP file, e.g., when the output .ZIP file
// was standard output or a non seekable device. For Zip64 format
// archives, the compressed and uncompressed sizes are 8 bytes each.
struct DataDescriptor
{
ulong lCRC32; // crc-32 4 bytes
ulong lSizeCompressed; // compressed size 4 bytes
ulong lSizeUncompressed; // uncompressed size 4 bytes
bool operator == (const DataDescriptor& d)const
{
return lCRC32 == d.lCRC32 && lSizeCompressed == d.lSizeCompressed && lSizeUncompressed == d.lSizeUncompressed;
}
bool operator != (const DataDescriptor& d)const
{
return lCRC32 != d.lCRC32 || lSizeCompressed != d.lSizeCompressed || lSizeUncompressed != d.lSizeUncompressed;
}
} PACK_GCC;
// the File Header as it appears in the CDR
// followed by:
// file name (variable size)
// extra field (variable size)
// file comment (variable size)
struct CDRFileHeader
{
enum {SIGNATURE = 0x02014b50};
ulong lSignature; // central file header signature 4 bytes (0x02014b50)
ushort nVersionMadeBy; // version made by 2 bytes
ushort nVersionNeeded; // version needed to extract 2 bytes
ushort nFlags; // general purpose bit flag 2 bytes
ushort nMethod; // compression method 2 bytes
ushort nLastModTime; // last mod file time 2 bytes
ushort nLastModDate; // last mod file date 2 bytes
DataDescriptor desc;
ushort nFileNameLength; // file name length 2 bytes
ushort nExtraFieldLength; // extra field length 2 bytes
ushort nFileCommentLength; // file comment length 2 bytes
ushort nDiskNumberStart; // disk number start 2 bytes
ushort nAttrInternal; // internal file attributes 2 bytes
ulong lAttrExternal; // external file attributes 4 bytes
// This is the offset from the start of the first disk on
// which this file appears, to where the local header should
// be found. If an archive is in zip64 format and the value
// in this field is 0xFFFFFFFF, the size will be in the
// corresponding 8 byte zip64 extended information extra field.
enum {ZIP64_LOCAL_HEADER_OFFSET = 0xFFFFFFFF};
ulong lLocalHeaderOffset; // relative offset of local header 4 bytes
} PACK_GCC;
// this is the local file header that appears before the compressed data
// followed by:
// file name (variable size)
// extra field (variable size)
struct LocalFileHeader
{
enum {SIGNATURE = 0x04034b50};
ulong lSignature; // local file header signature 4 bytes (0x04034b50)
ushort nVersionNeeded; // version needed to extract 2 bytes
ushort nFlags; // general purpose bit flag 2 bytes
ushort nMethod; // compression method 2 bytes
ushort nLastModTime; // last mod file time 2 bytes
ushort nLastModDate; // last mod file date 2 bytes
DataDescriptor desc;
ushort nFileNameLength; // file name length 2 bytes
ushort nExtraFieldLength; // extra field length 2 bytes
} PACK_GCC;
}
#undef PACK_GCC
#if !defined(LINUX)
#pragma pack(pop)
#endif
#endif // _ZIP_FILE_FORMAT_HDR_