/* $OpenBSD: c_rle.c,v 1.11 2022/12/24 07:12:09 tb Exp $ */ /* * --------------------------------------------------------------------------- * Patches to this file were contributed by * Ulf Moeller and Bodo Moeller . * --------------------------------------------------------------------------- * Copyright (c) 1999, 2011 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * --------------------------------------------------------------------------- * Parts of this file are derived from SSLeay code * which is covered by the following Copyright and license: * --------------------------------------------------------------------------- * Copyright (c) 1998 Eric Young * All rights reserved. * * This package is an SSL implementation written * by Eric Young . * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson . * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given * attribution as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young " * The word 'cryptographic' can be left out if the rouines from the * library being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) * from the apps directory (application code) you must include an * acknowledgement: "This product includes software written * by Tim Hudson " * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version * or derivative of this code cannot be changed. i.e. this code cannot * simply be copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include #include #include #include #include "comp_local.h" static int rle_compress_block(COMP_CTX *ctx, unsigned char *out, unsigned int olen, unsigned char *in, unsigned int ilen); static int rle_expand_block(COMP_CTX *ctx, unsigned char *out, unsigned int olen, unsigned char *in, unsigned int ilen); static COMP_METHOD rle_method = { .type = NID_rle_compression, .name = LN_rle_compression, .compress = rle_compress_block, .expand = rle_expand_block }; COMP_METHOD * COMP_rle(void) { return (&rle_method); } static int rle_compress_block(COMP_CTX *ctx, unsigned char *out, unsigned int olen, unsigned char *in, unsigned int ilen) { if (ilen == 0 || olen < (ilen - 1)) { return (-1); } *(out++) = 0; memcpy(out, in, ilen); return (ilen + 1); } static int rle_expand_block(COMP_CTX *ctx, unsigned char *out, unsigned int olen, unsigned char *in, unsigned int ilen) { int i; if (olen < (ilen - 1)) { return (-1); } i= *(in++); if (i == 0) { memcpy(out, in, ilen - 1); } return (ilen - 1); }