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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/lib/dist/cmd/bzfs/unbflz.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include "bzfs.h"
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int
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Bgetint(Biobuf *b)
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{
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	uchar p[4];
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	if(Bread(b, p, 4) != 4)
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		sysfatal("short read");
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	return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
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}
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/*
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 * memmove but make sure overlap works properly.
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 */
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void
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copy(uchar *dst, uchar *src, int n)
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{
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	while(n-- > 0)
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		*dst++ = *src++;
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}
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int
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unbflz(int in)
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{
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	int rv, out, p[2];
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	Biobuf *b, bin;
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	char buf[5];
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	uchar *data;
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	int i, j, length, n, m, o, sum;
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	ulong *blk;
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	int nblk, mblk;
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	if(pipe(p) < 0)
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		sysfatal("pipe: %r");
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	rv = p[0];
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	out = p[1];
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	switch(rfork(RFPROC|RFFDG|RFNOTEG|RFMEM)){
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	case -1:
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		sysfatal("fork: %r");
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	case 0:
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		close(rv);
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		break;
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	default:
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		close(in);
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		close(out);
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		return rv;
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	}
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	Binit(&bin, in, OREAD);
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	b = &bin;
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	if(Bread(b, buf, 4) != 4)
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		sysfatal("short read");
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	if(memcmp(buf, "BLZ\n", 4) != 0)
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		sysfatal("bad header");
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	length = Bgetint(b);
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	data = malloc(length);
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	if(data == nil)
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		sysfatal("out of memory");
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	sum = 0;
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	nblk = 0;
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	mblk = 0;
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	blk = nil;
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	while(sum < length){
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		if(nblk>=mblk){
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			mblk += 16384;
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			blk = realloc(blk, (mblk+1)*sizeof(blk[0]));
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			if(blk == nil)
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				sysfatal("out of memory");
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		}
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		n = Bgetint(b);
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		blk[nblk++] = n;
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		if(n&(1<<31))
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			n &= ~(1<<31);
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		else
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			blk[nblk++] = Bgetint(b);
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		sum += n;
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	}
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	if(sum != length)
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		sysfatal("bad compressed data %d %d", sum, length);
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	i = 0;
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	j = 0;
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	while(i < length){
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		assert(j < nblk);
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		n = blk[j++];
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		if(n&(1<<31)){
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			n &= ~(1<<31);
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			if((m=Bread(b, data+i, n)) != n)
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				sysfatal("short read %d %d", n, m);
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		}else{
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			o = blk[j++];
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			copy(data+i, data+o, n);
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		}
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		i += n;
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	}
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	write(out, data, length);
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	close(in);
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	close(out);
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	_exits(0);
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	return -1;
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}