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/*
* uncompress.c
*
* (C) Copyright 1999 Linus Torvalds
*
* cramfs interfaces to the uncompression library. There's really just
* three entrypoints:
*
* - cramfs_uncompress_init() - called to initialize the thing.
* - cramfs_uncompress_exit() - tell me when you're done
* - cramfs_uncompress_block() - uncompress a block.
*
* NOTE NOTE NOTE! The uncompression is entirely single-threaded. We
* only have one stream, and we'll initialize it only once even if it
* then is used by multiple filesystems.
*/
#include <linux/kernel.h>
#include "inflate/zlib.h"
static z_stream stream;
static int initialized = 0;
/* Returns length of decompressed data. */
int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen)
{
int err;
stream.next_in = src;
stream.avail_in = srclen;
stream.next_out = dst;
stream.avail_out = dstlen;
err = cramfs_inflateReset(&stream);
if (err != Z_OK) {
printk("cramfs_inflateReset error %d\n", err);
cramfs_inflateEnd(&stream);
cramfs_inflateInit(&stream);
}
err = cramfs_inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto err;
return stream.total_out;
err:
printk("Error %d while decompressing!\n", err);
printk("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen);
return 0;
}
int cramfs_uncompress_init(void)
{
if (!initialized++) {
stream.next_in = NULL;
stream.avail_in = 0;
cramfs_inflateInit(&stream);
}
return 0;
}
int cramfs_uncompress_exit(void)
{
if (!--initialized)
cramfs_inflateEnd(&stream);
return 0;
}
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