/* * 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. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include "internal.h" static z_stream stream; static int initialized; /* 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 = zlib_inflateReset(&stream); if (err != Z_OK) { pr_err("zlib_inflateReset error %d\n", err); zlib_inflateEnd(&stream); zlib_inflateInit(&stream); } err = zlib_inflate(&stream, Z_FINISH); if (err != Z_STREAM_END) goto err; return stream.total_out; err: pr_err("Error %d while decompressing!\n", err); pr_err("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen); return -EIO; } int cramfs_uncompress_init(void) { if (!initialized++) { stream.workspace = vmalloc(zlib_inflate_workspacesize()); if (!stream.workspace) { initialized = 0; return -ENOMEM; } stream.next_in = NULL; stream.avail_in = 0; zlib_inflateInit(&stream); } return 0; } void cramfs_uncompress_exit(void) { if (!--initialized) { zlib_inflateEnd(&stream); vfree(stream.workspace); } } ate-remove'>logtree commit diff

path: root/net/ethernet/eth.c

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