add gzip, bzip2
'
diff --git a/src/cmd/gzip/zip.h b/src/cmd/gzip/zip.h
new file mode 100644
index 0000000..9b703de
--- /dev/null
+++ b/src/cmd/gzip/zip.h
@@ -0,0 +1,83 @@
+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;
+};
