/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ /* * .../c-lib/src/nibble-alloc.c - fast mem allocation for decoded values * * MS Dec 31/91 * * Copyright (C) 1992 Michael Sample and the University of British Columbia * * This library is free software; you can redistribute it and/or * modify it provided that this copyright/license information is retained * in original form. * * If you modify this file, you must clearly indicate your changes. * * This source code is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * $Header: /cvs/Darwin/src/live/Security/SecuritySNACCRuntime/c-lib/src/nibble-alloc.c,v 1.1.1.1 2001/05/18 23:14:08 mb Exp $ * $Log: nibble-alloc.c,v $ * Revision 1.1.1.1 2001/05/18 23:14:08 mb * Move from private repository to open source repository * * Revision 1.2 2001/05/05 00:59:25 rmurphy * Adding darwin license headers * * Revision 1.1.1.1 1999/03/16 18:06:32 aram * Originals from SMIME Free Library. * * Revision 1.4 1997/02/28 13:39:51 wan * Modifications collected for new version 1.3: Bug fixes, tk4.2. * * Revision 1.3 1995/07/27 09:06:37 rj * use memzero that is defined in .../snacc.h to use either memset or bzero. * * changed `_' to `-' in file names. * * Revision 1.2 1994/09/01 00:07:16 rj * more portable .h file inclusion. * * Revision 1.1 1994/08/28 09:46:07 rj * first check-in. for a list of changes to the snacc-1.1 distribution please refer to the ChangeLog. * */ #include "asn-config.h" #if STDC_HEADERS || HAVE_STRING_H #include <string.h> /* An ANSI string.h and pre-ANSI memory.h might conflict. */ #if !STDC_HEADERS && HAVE_MEMORY_H #include <memory.h> #endif /* not STDC_HEADERS and HAVE_MEMORY_H */ #endif /* not STDC_HEADERS and not HAVE_STRING_H */ #include "nibble-alloc.h" NibbleMem *nmG = NULL; void InitNibbleMem PARAMS ((initialSize, incrementSize), unsigned long int initialSize _AND_ unsigned long int incrementSize) { NibbleMem *nm; nm = (NibbleMem*) malloc (sizeof (NibbleMem)); nm->incrementSize = incrementSize; nm->currNibbleBuf = nm->firstNibbleBuf = (NibbleBuf*)malloc (sizeof (NibbleBuf)); nm->firstNibbleBuf->curr = nm->firstNibbleBuf->start = (char*) malloc (initialSize); nm->firstNibbleBuf->end = nm->firstNibbleBuf->start + initialSize; nm->firstNibbleBuf->next = NULL; memzero (nm->currNibbleBuf->start, initialSize); nmG = nm;/* set global */ } /* InitNibbleAlloc */ /* * alloc new nibble buf, link in, reset to curr nibble buf */ void ServiceNibbleFault PARAMS ((size), unsigned long size) { NibbleMem *nm; unsigned long newBufSize; nm = nmG; if (size > nm->incrementSize) newBufSize = size; else newBufSize = nm->incrementSize; nm->currNibbleBuf->next = (NibbleBuf*) malloc (sizeof (NibbleBuf)); nm->currNibbleBuf = nm->currNibbleBuf->next; nm->currNibbleBuf->curr = nm->currNibbleBuf->start = (char*) malloc (newBufSize); nm->currNibbleBuf->end = nm->currNibbleBuf->start + newBufSize; nm->currNibbleBuf->next = NULL; memzero (nm->currNibbleBuf->start, newBufSize); } /* serviceNibbleFault */ /* * returns requested space filled with zeros */ void* NibbleAlloc PARAMS ((size), unsigned long size) { NibbleMem *nm; char *retVal; unsigned long ndiff; nm = nmG; if ((nm->currNibbleBuf->end - nm->currNibbleBuf->curr) < size) ServiceNibbleFault (size); retVal = nm->currNibbleBuf->curr; /* * maintain word alignment */ ndiff = size % sizeof (long); if (ndiff != 0) { nm->currNibbleBuf->curr += size + sizeof (long) - ndiff; /* * this is a fix from Terry Sullivan <FCLTPS@nervm.nerdc.ufl.edu> * * makes sure curr does not go past the end ptr */ if (nm->currNibbleBuf->curr > nm->currNibbleBuf->end) nm->currNibbleBuf->curr = nm->currNibbleBuf->end; } else nm->currNibbleBuf->curr += size; return retVal; } /* NibbleAlloc */ /* * frees all nibble buffers except the first, * resets the first to empty and zero's it */ void ResetNibbleMem() { NibbleMem *nm; NibbleBuf *tmp; NibbleBuf *nextTmp; nm = nmG; /* * reset first nibble buf */ memzero (nm->firstNibbleBuf->start, nm->firstNibbleBuf->curr - nm->firstNibbleBuf->start); nm->firstNibbleBuf->curr = nm->firstNibbleBuf->start; /* * free incrementally added nibble bufs */ for (tmp = nm->firstNibbleBuf->next; tmp != NULL; ) { free (tmp->start); nextTmp = tmp->next; free (tmp); tmp = nextTmp; } /* From ftp://ftp.cs.ubc.ca/pub/local/src/snacc/bugs-in-1.1 */ nm->firstNibbleBuf->next = NULL; nm->currNibbleBuf = nm->firstNibbleBuf; } /* ResetNibbleMem */ /* * frees all nibble buffers, closing this * NibbleMem completely */ void ShutdownNibbleMem() { NibbleMem *nm; NibbleBuf *tmp; NibbleBuf *nextTmp; nm = nmG; nmG = NULL; /* * free nibble bufs */ for (tmp = nm->firstNibbleBuf; tmp != NULL; ) { free (tmp->start); nextTmp = tmp->next; free (tmp); tmp = nextTmp; } free (nm); } /* ShutdownNibbleMem */