summaryrefslogtreecommitdiff
path: root/store/source/storlckb.cxx
blob: 1aaf2cbc0a776f12acce228277f12c515c559899 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include "storlckb.hxx"

#include <sal/types.h>
#include <rtl/string.h>
#include <rtl/ref.hxx>
#include <osl/mutex.hxx>

#include <store/types.h>

#include "storbase.hxx"
#include "stordata.hxx"
#include "storpage.hxx"

using namespace store;

/*========================================================================
 *
 * OStoreLockBytes implementation.
 *
 *======================================================================*/
const sal_uInt32 OStoreLockBytes::m_nTypeId(0x94190310);

/*
 * OStoreLockBytes.
 */
OStoreLockBytes::OStoreLockBytes()
    : m_xManager   (),
      m_xNode      (),
      m_bWriteable (false)
{
}

/*
 * ~OStoreLockBytes.
 */
OStoreLockBytes::~OStoreLockBytes()
{
    if (m_xManager.is() && m_xNode.is())
    {
        m_xManager->releasePage(m_xNode->m_aDescr);
    }
}

/*
 * isKindOf.
 */
bool OStoreLockBytes::isKindOf (sal_uInt32 nTypeId)
{
    return (nTypeId == m_nTypeId);
}

/*
 * create.
 */
storeError OStoreLockBytes::create (
    OStorePageManager *pManager,
    rtl_String const  *pPath,
    rtl_String const  *pName,
    storeAccessMode    eMode)
{
    rtl::Reference<OStorePageManager> xManager (pManager);
    if (!xManager.is())
        return store_E_InvalidAccess;

    if (!(pPath && pName))
        return store_E_InvalidParameter;

    OStoreDirectoryPageObject aPage;
    storeError eErrCode = xManager->iget (
        aPage, STORE_ATTRIB_ISFILE,
        pPath, pName, eMode);
    if (eErrCode != store_E_None)
        return eErrCode;

    if (!(aPage.attrib() & STORE_ATTRIB_ISFILE))
    {
        // No ISFILE in older versions (backward compatibility).
        if (aPage.attrib() & STORE_ATTRIB_ISLINK)
            return store_E_NotFile;
    }

    inode_holder_type xNode (aPage.get());
    if (eMode != storeAccessMode::ReadOnly)
        eErrCode = xManager->acquirePage (xNode->m_aDescr, storeAccessMode::ReadWrite);
    else
        eErrCode = xManager->acquirePage (xNode->m_aDescr, storeAccessMode::ReadOnly);
    if (eErrCode != store_E_None)
        return eErrCode;

    m_xManager   = xManager;
    m_xNode      = xNode;
    m_bWriteable = (eMode != storeAccessMode::ReadOnly);

    // Check for truncation.
    if (eMode == storeAccessMode::Create)
    {
        // Truncate to zero length.
        eErrCode = setSize(0);
    }
    return eErrCode;
}

/*
 * readAt.
 */
storeError OStoreLockBytes::readAt (
    sal_uInt32  nOffset,
    void       *pBuffer,
    sal_uInt32  nBytes,
    sal_uInt32 &rnDone)
{
    rnDone = 0;

    if (!m_xManager.is())
        return store_E_InvalidAccess;

    if (!pBuffer)
        return store_E_InvalidParameter;
    if (!nBytes)
        return store_E_None;

    // Acquire exclusive access.
    osl::MutexGuard aGuard (*m_xManager);

    // Determine data length.
    OStoreDirectoryPageObject aPage (m_xNode.get());

    sal_uInt32 nDataLen = aPage.dataLength();
    if ((nOffset + nBytes) > nDataLen)
        nBytes = nDataLen - nOffset;

    // Read data.
    OStoreDataPageObject aData;
    sal_uInt8 *pData = static_cast<sal_uInt8*>(pBuffer);
    while ((0 < nBytes) && (nOffset < nDataLen))
    {
        // Determine 'Offset' scope.
        inode::ChunkScope eScope = m_xNode->scope (nOffset);
        if (eScope == inode::SCOPE_INTERNAL)
        {
            // Read from inode page (internal scope).
            inode::ChunkDescriptor aDescr (
                nOffset, m_xNode->capacity());

            sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
            if(nLength > nBytes)
            {
                nLength = nBytes;
            }
            memcpy (
                &pData[rnDone],
                &m_xNode->m_pData[aDescr.m_nOffset],
                nLength);

            // Adjust counters.
            rnDone  += nLength;
            nOffset += nLength;
            nBytes  -= nLength;
        }
        else
        {
            // Read from data page (external scope).
            inode::ChunkDescriptor aDescr (
                nOffset - m_xNode->capacity(), OStoreDataPageData::capacity(m_xNode->m_aDescr)); // @@@

            sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
            if(nLength > nBytes)
            {
                nLength = nBytes;
            }

            storeError eErrCode = aPage.read (aDescr.m_nPage, aData, *m_xManager);
            if (eErrCode != store_E_None)
            {
                if (eErrCode != store_E_NotExists)
                    return eErrCode;

                memset (
                    &pData[rnDone],
                    0,
                    nLength);
            }
            else
            {
                PageHolderObject< data > xData (aData.makeHolder<data>());
                memcpy (
                    &pData[rnDone],
                    &xData->m_pData[aDescr.m_nOffset],
                    nLength);
            }

            // Adjust counters.
            rnDone  += nLength;
            nOffset += nLength;
            nBytes  -= nLength;
        }
    }

    // Done.
    return store_E_None;
}

/*
 * writeAt.
 */
storeError OStoreLockBytes::writeAt (
    sal_uInt32  nOffset,
    const void *pBuffer,
    sal_uInt32  nBytes,
    sal_uInt32 &rnDone)
{
    rnDone = 0;

    if (!m_xManager.is())
        return store_E_InvalidAccess;
    if (!m_bWriteable)
        return store_E_AccessViolation;

    if (!pBuffer)
        return store_E_InvalidParameter;
    if (!nBytes)
        return store_E_None;

    // Acquire exclusive access.
    osl::MutexGuard aGuard (*m_xManager);

    // Write data.
    OStoreDirectoryPageObject aPage (m_xNode.get());
    const sal_uInt8 *pData = static_cast<const sal_uInt8*>(pBuffer);

    storeError eErrCode = store_E_None;
    while (nBytes > 0)
    {
        // Determine 'Offset' scope.
        inode::ChunkScope eScope = m_xNode->scope (nOffset);
        if (eScope == inode::SCOPE_INTERNAL)
        {
            // Write to inode page (internal scope).
            inode::ChunkDescriptor aDescr (
                nOffset, m_xNode->capacity());

            sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
            if(nLength > nBytes)
            {
                nLength = nBytes;
            }

            memcpy (
                &m_xNode->m_pData[aDescr.m_nOffset],
                &pData[rnDone], nLength);

            // Mark inode dirty.
            aPage.touch();

            // Adjust counters.
            rnDone  += nLength;
            nOffset += nLength;
            nBytes  -= nLength;

            // Adjust data length.
            if (aPage.dataLength() < nOffset)
                aPage.dataLength (nOffset);
        }
        else
        {
            // Write to data page (external scope).
            OStoreDataPageObject aData;

            inode::ChunkDescriptor aDescr (
                nOffset - m_xNode->capacity(), OStoreDataPageData::capacity(m_xNode->m_aDescr)); // @@@

            sal_uInt32 nLength = sal_uInt32(aDescr.m_nLength);
            if ((aDescr.m_nOffset > 0) || (nBytes < nLength))
            {
                // Unaligned. Need to load/create data page.
// @@@ loadOrCreate()
                eErrCode = aPage.read (aDescr.m_nPage, aData, *m_xManager);
                if (eErrCode != store_E_None)
                {
                    if (eErrCode != store_E_NotExists)
                        return eErrCode;

                    eErrCode = aData.construct<data>(m_xManager->allocator());
                    if (eErrCode != store_E_None)
                        return eErrCode;
                }
            }

            PageHolderObject< data > xData (aData.makeHolder<data>());
            if (!xData.is())
            {
                eErrCode = aData.construct<data>(m_xManager->allocator());
                if (eErrCode != store_E_None)
                    return eErrCode;
                xData = aData.makeHolder<data>();
            }

            // Modify data page.
            if(nLength > nBytes)
            {
                nLength = nBytes;
            }
            memcpy (
                &xData->m_pData[aDescr.m_nOffset],
                &pData[rnDone], nLength);

            // Save data page.
            eErrCode = aPage.write (aDescr.m_nPage, aData, *m_xManager);
            if (eErrCode != store_E_None)
                return eErrCode;

            // Adjust counters.
            rnDone  += nLength;
            nOffset += nLength;
            nBytes  -= nLength;

            // Adjust data length.
            if (aPage.dataLength() < nOffset)
                aPage.dataLength (nOffset);
        }
    }

    // Check for modified inode.
    if (aPage.dirty())
        return m_xManager->saveObjectAt (aPage, aPage.location());
    else
        return store_E_None;
}

/*
 * setSize.
 */
storeError OStoreLockBytes::setSize (sal_uInt32 nSize)
{
    if (!m_xManager.is())
        return store_E_InvalidAccess;
    if (!m_bWriteable)
        return store_E_AccessViolation;

    // Acquire exclusive access.
    osl::MutexGuard aGuard (*m_xManager);

    // Determine current length.
    OStoreDirectoryPageObject aPage (m_xNode.get());
    sal_uInt32 nDataLen = aPage.dataLength();

    if (nSize == nDataLen)
        return store_E_None;

    if (nSize < nDataLen)
    {
        // Truncate.
        storeError eErrCode = store_E_None;

        // Determine 'Size' scope.
        inode::ChunkScope eSizeScope = m_xNode->scope (nSize);
        if (eSizeScope == inode::SCOPE_INTERNAL)
        {
            // Internal 'Size' scope. Determine 'Data' scope.
            inode::ChunkScope eDataScope = m_xNode->scope (nDataLen);
            if (eDataScope == inode::SCOPE_EXTERNAL)
            {
                // External 'Data' scope. Truncate all external data pages.
                eErrCode = aPage.truncate (0, *m_xManager);
                if (eErrCode != store_E_None)
                    return eErrCode;
            }

            // Truncate internal data page.
            inode::ChunkDescriptor aDescr (nSize, m_xNode->capacity());
            memset (
                &(m_xNode->m_pData[aDescr.m_nOffset]),
                0, aDescr.m_nLength);
        }
        else
        {
            // External 'Size' scope. Truncate external data pages.
            inode::ChunkDescriptor aDescr (
                nSize - m_xNode->capacity(), OStoreDataPageData::capacity(m_xNode->m_aDescr)); // @@@

            sal_uInt32 nPage = aDescr.m_nPage;
            if (aDescr.m_nOffset) nPage += 1;

            eErrCode = aPage.truncate (nPage, *m_xManager);
            if (eErrCode != store_E_None)
                return eErrCode;
        }
    }

    // Set (extended or truncated) size.
    aPage.dataLength (nSize);

    // Save modified inode.
    return m_xManager->saveObjectAt (aPage, aPage.location());
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */