ref: 6b6b9a236d773c704daaf7f7b5b090111e28ac87
dir: /sys/src/cmd/gzip/zip.h/
typedef struct ZipHead ZipHead;
enum
{
/*
* magic numbers
*/
ZHeader = 0x04034b50,
ZCHeader = 0x02014b50,
ZECHeader = 0x06054b50,
/*
* "general purpose flag" bits
*/
ZEncrypted = 1 << 0,
ZTrailInfo = 1 << 3, /* uncsize, csize, and crc are in trailer */
ZCompPatch = 1 << 5, /* compression patched data */
ZCrcPoly = 0xedb88320,
/*
* compression method
*/
ZDeflate = 8,
/*
* internal file attributes
*/
ZIsText = 1 << 0,
/*
* file attribute interpretation, from high byte of version
*/
ZDos = 0,
ZAmiga = 1,
ZVMS = 2,
ZUnix = 3,
ZVMCMS = 4,
ZAtariST = 5,
ZOS2HPFS = 6,
ZMac = 7,
ZZsys = 8,
ZCPM = 9,
ZNtfs = 10,
/*
* external attribute flags for ZDos
*/
ZDROnly = 0x01,
ZDHidden = 0x02,
ZDSystem = 0x04,
ZDVLable = 0x08,
ZDDir = 0x10,
ZDArch = 0x20,
ZHeadSize = 4 + 2 + 2 + 2 + 2 + 2 + 4 + 4 + 4 + 2 + 2,
ZHeadCrc = 4 + 2 + 2 + 2 + 2 + 2,
ZTrailSize = 4 + 4 + 4,
ZCHeadSize = 4 + 2 + 2 + 2 + 2 + 2 + 2 + 4 + 4 + 4 + 2 + 2 + 2 + 2 + 2 + 4 + 4,
ZECHeadSize = 4 + 2 + 2 + 2 + 2 + 4 + 4 + 2,
};
/*
* interesting info from a zip header
*/
struct ZipHead
{
int madeos; /* version made by */
int madevers;
int extos; /* version needed to extract */
int extvers;
int flags; /* general purpose bit flag */
int meth;
int modtime;
int moddate;
ulong crc;
ulong csize;
ulong uncsize;
int iattr;
ulong eattr;
ulong off;
char *file;
};