comprtest.c

这是著名的jffs2嵌入式日志文件系统的源代码

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};
#endif
static unsigned char comprbuf[TESTDATA_LEN];
static unsigned char decomprbuf[TESTDATA_LEN];

int jffs2_decompress(unsigned char comprtype, unsigned char *cdata_in, 
		     unsigned char *data_out, __u32 cdatalen, __u32 datalen);
unsigned char jffs2_compress(unsigned char *data_in, unsigned char *cpage_out, 
			     __u32 *datalen, __u32 *cdatalen);

int init_module(void ) {
	unsigned char comprtype;
	__u32 c, d;
	int ret;

	printk("Original data: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
	       testdata[0],testdata[1],testdata[2],testdata[3], 
	       testdata[4],testdata[5],testdata[6],testdata[7], 
	       testdata[8],testdata[9],testdata[10],testdata[11], 
	       testdata[12],testdata[13],testdata[14],testdata[15]); 
	d = TESTDATA_LEN;
	c = TESTDATA_LEN;
	comprtype = jffs2_compress(testdata, comprbuf, &d, &c);

	printk("jffs2_compress used compression type %d. Compressed size %d, uncompressed size %d\n",
	       comprtype, c, d);
	printk("Compressed data: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
	       comprbuf[0],comprbuf[1],comprbuf[2],comprbuf[3], 
	       comprbuf[4],comprbuf[5],comprbuf[6],comprbuf[7], 
	       comprbuf[8],comprbuf[9],comprbuf[10],comprbuf[11], 
	       comprbuf[12],comprbuf[13],comprbuf[14],comprbuf[15]); 

	ret = jffs2_decompress(comprtype, comprbuf, decomprbuf, c, d);
	printk("jffs2_decompress returned %d\n", ret);
	printk("Decompressed data:  %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
	       decomprbuf[0],decomprbuf[1],decomprbuf[2],decomprbuf[3], 
	       decomprbuf[4],decomprbuf[5],decomprbuf[6],decomprbuf[7], 
	       decomprbuf[8],decomprbuf[9],decomprbuf[10],decomprbuf[11], 
	       decomprbuf[12],decomprbuf[13],decomprbuf[14],decomprbuf[15]); 
	if (memcmp(decomprbuf, testdata, d))
		printk("Compression and decompression corrupted data\n");
	else
		printk("Compression good for %d bytes\n", d);
	return 1;
}