sal/rtl/byteseq.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <assert.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23
  24 #include <osl/diagnose.h>
  25 #include <osl/interlck.h>
  26
  27 #include <rtl/byteseq.h>
  28
  29 /* static data to be referenced by all empty strings
  30  * the refCount is predefined to 1 and must never become 0 !
  31  */
  32 static sal_Sequence aEmpty_rtl_ByteSeq =
  33 {
  34     1,      /* sal_Int32    refCount;   */
  35     0,      /* sal_Int32    length;     */
  36     { 0 }   /* sal_Unicode  buffer[1];  */
  37 };
  38
  39 void SAL_CALL rtl_byte_sequence_reference2One(
  40     sal_Sequence ** ppSequence ) SAL_THROW_EXTERN_C()
  41 {
  42     sal_Sequence * pSequence, * pNew;
  43
  44     OSL_ENSURE( ppSequence, "### null ptr!" );
  45     pSequence = *ppSequence;
  46
  47     if (pSequence->nRefCount > 1)
  48     {
  49         sal_Int32 nElements = pSequence->nElements;
  50         if (nElements)
  51         {
  52             pNew = static_cast<sal_Sequence *>(malloc( SAL_SEQUENCE_HEADER_SIZE + nElements ));
  53
  54             if ( pNew != nullptr )
  55                 memcpy( pNew->elements, pSequence->elements, nElements );
  56
  57             if (! osl_atomic_decrement( &pSequence->nRefCount ))
  58                 free( pSequence );
  59         }
  60         else
  61         {
  62             pNew = static_cast<sal_Sequence *>(malloc( SAL_SEQUENCE_HEADER_SIZE ));
  63         }
  64
  65         if ( pNew != nullptr )
  66         {
  67             pNew->nRefCount = 1;
  68             pNew->nElements = nElements;
  69         }
  70
  71         *ppSequence = pNew;
  72     }
  73 }
  74
  75 void SAL_CALL rtl_byte_sequence_realloc(
  76     sal_Sequence ** ppSequence, sal_Int32 nSize ) SAL_THROW_EXTERN_C()
  77 {
  78     sal_Sequence * pSequence, * pNew;
  79     sal_Int32 nElements;
  80
  81     assert(ppSequence && "### null ptr!");
  82     pSequence = *ppSequence;
  83     nElements = pSequence->nElements;
  84
  85     if (nElements == nSize)
  86         return;
  87
  88     if (pSequence->nRefCount > 1) // split
  89     {
  90         pNew = static_cast<sal_Sequence *>(malloc( SAL_SEQUENCE_HEADER_SIZE + nSize ));
  91
  92         if ( pNew != nullptr )
  93         {
  94             if (nSize > nElements)
  95             {
  96                 memcpy( pNew->elements, pSequence->elements, nElements );
  97                 memset( pNew->elements + nElements, 0, nSize - nElements );
  98             }
  99             else
 100             {
 101                 memcpy( pNew->elements, pSequence->elements, nSize );
 102             }
 103         }
 104
 105         if (! osl_atomic_decrement( &pSequence->nRefCount ))
 106             free( pSequence );
 107         pSequence = pNew;
 108     }
 109     else
 110     {
 111         pSequence = static_cast<sal_Sequence *>(realloc(
 112             pSequence, SAL_SEQUENCE_HEADER_SIZE + nSize ));
 113     }
 114
 115     if ( pSequence != nullptr )
 116     {
 117         pSequence->nRefCount = 1;
 118         pSequence->nElements = nSize;
 119     }
 120
 121     *ppSequence = pSequence;
 122 }
 123
 124 void SAL_CALL rtl_byte_sequence_acquire( sal_Sequence *pSequence )
 125     SAL_THROW_EXTERN_C()
 126 {
 127     OSL_ASSERT( pSequence );
 128     osl_atomic_increment( &(pSequence->nRefCount) );
 129 }
 130
 131 void SAL_CALL rtl_byte_sequence_release( sal_Sequence *pSequence )
 132     SAL_THROW_EXTERN_C()
 133 {
 134     if ( pSequence != nullptr )
 135     {
 136         if (! osl_atomic_decrement( &(pSequence->nRefCount )) )
 137         {
 138             free( pSequence );
 139         }
 140     }
 141 }
 142
 143 void SAL_CALL rtl_byte_sequence_construct( sal_Sequence **ppSequence , sal_Int32 nLength )
 144     SAL_THROW_EXTERN_C()
 145 {
 146     OSL_ASSERT( ppSequence );
 147     if( *ppSequence )
 148     {
 149         rtl_byte_sequence_release( *ppSequence );
 150         *ppSequence = nullptr;
 151     }
 152
 153     if( nLength )
 154     {
 155         *ppSequence = static_cast<sal_Sequence *>(rtl_allocateZeroMemory( SAL_SEQUENCE_HEADER_SIZE + nLength ));
 156
 157         if ( *ppSequence != nullptr )
 158         {
 159             (*ppSequence)->nRefCount = 1;
 160             (*ppSequence)->nElements = nLength;
 161         }
 162     }
 163     else
 164     {
 165         *ppSequence = &aEmpty_rtl_ByteSeq;
 166         rtl_byte_sequence_acquire( *ppSequence );
 167     }
 168 }
 169
 170 void SAL_CALL rtl_byte_sequence_constructNoDefault( sal_Sequence **ppSequence , sal_Int32 nLength )
 171     SAL_THROW_EXTERN_C()
 172 {
 173     OSL_ASSERT( ppSequence );
 174     if( *ppSequence )
 175     {
 176         rtl_byte_sequence_release( *ppSequence );
 177         *ppSequence = nullptr;
 178     }
 179
 180     *ppSequence = static_cast<sal_Sequence *>(malloc( SAL_SEQUENCE_HEADER_SIZE + nLength ));
 181
 182     if ( *ppSequence != nullptr )
 183     {
 184         (*ppSequence)->nRefCount = 1;
 185         (*ppSequence)->nElements = nLength;
 186     }
 187 }
 188
 189 void SAL_CALL rtl_byte_sequence_constructFromArray(
 190     sal_Sequence **ppSequence, const sal_Int8 *pData , sal_Int32 nLength )
 191     SAL_THROW_EXTERN_C()
 192 {
 193     rtl_byte_sequence_constructNoDefault( ppSequence , nLength );
 194     if ( *ppSequence != nullptr && nLength != 0 )
 195         memcpy( (*ppSequence)->elements, pData, nLength );
 196 }
 197
 198 void SAL_CALL rtl_byte_sequence_assign( sal_Sequence **ppSequence , sal_Sequence *pSequence )
 199     SAL_THROW_EXTERN_C()
 200 {
 201     if ( *ppSequence != pSequence)
 202     {
 203         if( *ppSequence )
 204         {
 205             rtl_byte_sequence_release( *ppSequence );
 206         }
 207         *ppSequence = pSequence;
 208         rtl_byte_sequence_acquire( *ppSequence );
 209     }
 210 //  else
 211 //      nothing to do
 212
 213 }
 214
 215 sal_Bool SAL_CALL rtl_byte_sequence_equals( sal_Sequence *pSequence1 , sal_Sequence *pSequence2 )
 216     SAL_THROW_EXTERN_C()
 217 {
 218     assert(pSequence1 && pSequence2);
 219     if (pSequence1 == pSequence2)
 220     {
 221         return true;
 222     }
 223     if (pSequence1->nElements != pSequence2->nElements)
 224     {
 225         return false;
 226     }
 227     return
 228         memcmp(
 229             pSequence1->elements, pSequence2->elements, pSequence1->nElements )
 230         == 0;
 231 }
 232
 233 const sal_Int8 *SAL_CALL rtl_byte_sequence_getConstArray( sal_Sequence *pSequence )
 234     SAL_THROW_EXTERN_C()
 235 {
 236     return reinterpret_cast<sal_Int8*>(pSequence->elements);
 237 }
 238
 239 sal_Int32 SAL_CALL rtl_byte_sequence_getLength( sal_Sequence *pSequence )
 240     SAL_THROW_EXTERN_C()
 241 {
 242     return pSequence->nElements;
 243 }
 244
 245 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */