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typedef struct PaqHeader PaqHeader;
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typedef struct PaqBlock PaqBlock;
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typedef struct PaqTrailer PaqTrailer;
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typedef struct PaqDir PaqDir;
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enum {
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	HeaderMagic = 0x529ab12b,
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	HeaderSize = 44,
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	BigHeaderMagic = 0x25a9,
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	BlockMagic = 0x198a1cbf,
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	BlockSize = 12,
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	BigBlockMagic = 0x91a8,
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	TrailerMagic = 0x6b46e688,
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	TrailerSize = 28,
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	Version = 1,
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	MaxBlockSize = 512*1024,
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	MinBlockSize = 512,
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	MinDirSize = 28,
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};
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/* block types */
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enum {
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	DirBlock,
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	DataBlock,
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	PointerBlock,
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};
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/* encodings */
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enum {
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	NoEnc,
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	DeflateEnc,
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};
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struct PaqHeader
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{
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	ulong	magic;
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	ushort	version;
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	ulong	blocksize;
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	ulong	time;
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	char	label[32];
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};
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struct PaqBlock
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{
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	ulong	magic;
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	ulong	size;		/* data size - always <= blocksize */
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	uchar	type;
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	uchar	encoding;
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	ulong	adler32;	/* applied to unencoded data */
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};
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struct PaqTrailer
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{
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	ulong	magic;
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	ulong	root;
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	uchar	sha1[20];
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};
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struct PaqDir
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{
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	ulong	qid;
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	ulong	mode;
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	ulong	mtime;
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	ulong	length;
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	ulong	offset;		/* to pointer block */
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	char 	*name;
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	char	*uid;
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	char	*gid;
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};