/* * @OPENGROUP_COPYRIGHT@ * COPYRIGHT NOTICE * Copyright (c) 1990, 1991, 1992, 1993 Open Software Foundation, Inc. * Copyright (c) 1996, 1997, 1998, 1999, 2000 The Open Group * ALL RIGHTS RESERVED (MOTIF). See the file named COPYRIGHT.MOTIF for * the full copyright text. * * This software is subject to an open license. It may only be * used on, with or for operating systems which are themselves open * source systems. You must contact The Open Group for a license * allowing distribution and sublicensing of this software on, with, * or for operating systems which are not Open Source programs. * * See http://www.opengroup.org/openmotif/license for full * details of the license agreement. Any use, reproduction, or * distribution of the program constitutes recipient's acceptance of * this agreement. * * EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS * PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY * WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY * OR FITNESS FOR A PARTICULAR PURPOSE * * EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT * NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE * EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ /* * HISTORY */ #ifdef REV_INFO #ifndef lint static char rcsid[] = "$XConsortium: CompresWrite.c /main/7 1995/07/14 11:49:15 drk $" #endif #endif /*********************************************************************** @(#)CompresWrite.c 1.5.1.1 Date:1/22/91 Author: TAT History: 05/24/90 SJS add to SCCS Calls: Summary: This function writes out visual info in compressed form ************************************************************************/ #include "vislib.h" void mvsCompressWrite(fp,buffer,size) FILE *fp; unsigned char buffer[]; int size; { unsigned char *bp = buffer; unsigned char oldchar; long cnt; unsigned char *end_of_buffer = &buffer[size]; unsigned char outbuf[OUTBUF_SIZE]; int i,j; oldchar = *bp++; cnt = 1; i = 0; /* Loop for pointer bp from beginning of buffer until 'size' bytes passed */ while (bp < end_of_buffer) { /* Count number of times oldchar reappears consecutively */ while ((bp < end_of_buffer) && (*bp == oldchar)) { bp++; cnt++; } /* Write out character that repeats */ outbuf[i++] = oldchar; /* Then write out repeat count */ /* Use variable length format where most-sig-bit is set in each byte */ /* to indicate that the next byte contains more bits. Of course this */ /* means that we can only use the 7 least sig bits per byte for data. */ while (cnt > 127) { outbuf[i++] = (cnt & 0x7f)|(0x80); /* Force MSBit to 1 */ cnt >>= 7; } outbuf[i++] = cnt; /* This one is gauranteed to have MSBit set to 0 */ if (i > OUTBUF_SIZE - 10) { /* If buffer full, flush out to file */ if (mvsBigChars) { for (j=0; j