summaryrefslogtreecommitdiffstats
path: root/src/libs/7zip/unix/CPP/7zip/Archive/ApmHandler.cpp
blob: a3b5e19b972e23be91f9c2fdca07e2af50ed0cfe (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
// ApmHandler.cpp

#include "StdAfx.h"

#include "../../../C/CpuArch.h"

#include "Common/ComTry.h"
#include "Common/IntToString.h"
#include "Common/MyString.h"

#include "Windows/PropVariant.h"

#include "../Common/LimitedStreams.h"
#include "../Common/ProgressUtils.h"
#include "../Common/RegisterArc.h"
#include "../Common/StreamUtils.h"

#include "../Compress/CopyCoder.h"

#define Get16(p) GetBe16(p)
#define Get32(p) GetBe32(p)

using namespace NWindows;

namespace NArchive {
namespace NApm {

struct CItem
{
  UInt32 StartBlock;
  UInt32 NumBlocks;
  char Name[32];
  char Type[32];
  /*
  UInt32 DataStartBlock;
  UInt32 NumDataBlocks;
  UInt32 Status;
  UInt32 BootStartBlock;
  UInt32 BootSize;
  UInt32 BootAddr;
  UInt32 BootEntry;
  UInt32 BootChecksum;
  char Processor[16];
  */

  bool Parse(const Byte *p, UInt32 &numBlocksInMap)
  {
    if (p[0] != 0x50 || p[1] != 0x4D || p[2] != 0 || p[3] != 0)
      return false;
    numBlocksInMap = Get32(p + 4);
    StartBlock = Get32(p + 8);
    NumBlocks = Get32(p + 0xC);
    memcpy(Name, p + 0x10, 32);
    memcpy(Type, p + 0x30, 32);
    /*
    DataStartBlock = Get32(p + 0x50);
    NumDataBlocks = Get32(p + 0x54);
    Status = Get32(p + 0x58);
    BootStartBlock = Get32(p + 0x5C);
    BootSize = Get32(p + 0x60);
    BootAddr = Get32(p + 0x64);
    if (Get32(p + 0x68) != 0)
      return false;
    BootEntry = Get32(p + 0x6C);
    if (Get32(p + 0x70) != 0)
      return false;
    BootChecksum = Get32(p + 0x74);
    memcpy(Processor, p + 0x78, 16);
    */
    return true;
  }
};

class CHandler:
  public IInArchive,
  public IInArchiveGetStream,
  public CMyUnknownImp
{
  CMyComPtr<IInStream> _stream;
  CRecordVector<CItem> _items;

  int _blockSizeLog;
  UInt32 _numBlocks;

  HRESULT ReadTables(IInStream *stream);
  UInt64 BlocksToBytes(UInt32 i) const { return (UInt64)i << _blockSizeLog; }
  UInt64 GetItemSize(const CItem &item) { return BlocksToBytes(item.NumBlocks); }
public:
  MY_UNKNOWN_IMP2(IInArchive, IInArchiveGetStream)
  INTERFACE_IInArchive(;)
  STDMETHOD(GetStream)(UInt32 index, ISequentialInStream **stream);
};

static inline int GetLog(UInt32 num)
{
  for (int i = 0; i < 31; i++)
    if (((UInt32)1 << i) == num)
      return i;
  return -1;
}

HRESULT CHandler::ReadTables(IInStream *stream)
{
  const UInt32 kSectorSize = 512;
  Byte buf[kSectorSize];
  {
    RINOK(ReadStream_FALSE(stream, buf, kSectorSize));
    if (buf[0] != 0x45 || buf[1] != 0x52)
      return S_FALSE;
    _blockSizeLog = GetLog(Get16(buf + 2));
    if (_blockSizeLog < 9 || _blockSizeLog > 14)
      return S_FALSE;
    _numBlocks = Get32(buf + 4);
    for (int i = 8; i < 16; i++)
      if (buf[i] != 0)
        return S_FALSE;
  }

  unsigned numSkips = (unsigned)1 << (_blockSizeLog - 9);
  for (unsigned j = 1; j < numSkips; j++)
  {
    RINOK(ReadStream_FALSE(stream, buf, kSectorSize));
  }

  UInt32 numBlocksInMap = 0;
  for (unsigned i = 0;;)
  {
    RINOK(ReadStream_FALSE(stream, buf, kSectorSize));
 
    CItem item;
    
    UInt32 numBlocksInMap2;
    if (!item.Parse(buf, numBlocksInMap2))
      return S_FALSE;
    if (i == 0)
    {
      numBlocksInMap = numBlocksInMap2;
      if (numBlocksInMap > (1 << 8))
        return S_FALSE;
    }
    else if (numBlocksInMap2 != numBlocksInMap)
      return S_FALSE;

    UInt32 finish = item.StartBlock + item.NumBlocks;
    if (finish < item.StartBlock)
      return S_FALSE;
    _numBlocks = MyMax(_numBlocks, finish);
    
    _items.Add(item);
    for (unsigned j = 1; j < numSkips; j++)
    {
      RINOK(ReadStream_FALSE(stream, buf, kSectorSize));
    }
    if (++i == numBlocksInMap)
      break;
  }
  return S_OK;
}

STDMETHODIMP CHandler::Open(IInStream *stream,
    const UInt64 * /* maxCheckStartPosition */,
    IArchiveOpenCallback * /* openArchiveCallback */)
{
  COM_TRY_BEGIN
  Close();
  RINOK(ReadTables(stream));
  _stream = stream;
  return S_OK;
  COM_TRY_END
}

STDMETHODIMP CHandler::Close()
{
  _items.Clear();
  _stream.Release();
  return S_OK;
}

STATPROPSTG kProps[] =
{
  { NULL, kpidPath, VT_BSTR},
  { NULL, kpidSize, VT_UI8},
  { NULL, kpidOffset, VT_UI8}
};

STATPROPSTG kArcProps[] =
{
  { NULL, kpidClusterSize, VT_UI4},
  { NULL, kpidPhySize, VT_UI8}
};

IMP_IInArchive_Props
IMP_IInArchive_ArcProps

static AString GetString(const char *s)
{
  AString res;
  for (int i = 0; i < 32 && s[i] != 0; i++)
    res += s[i];
  return res;
}

STDMETHODIMP CHandler::GetArchiveProperty(PROPID propID, PROPVARIANT *value)
{
  COM_TRY_BEGIN
  NCOM::CPropVariant prop;
  switch(propID)
  {
    case kpidMainSubfile:
    {
      int mainIndex = -1;
      for (int i = 0; i < _items.Size(); i++)
      {
        AString s = GetString(_items[i].Type);
        if (s != "Apple_Free" &&
            s != "Apple_partition_map")
        {
          if (mainIndex >= 0)
          {
            mainIndex = -1;
            break;
          }
          mainIndex = i;
        }
      }
      if (mainIndex >= 0)
        prop = (UInt32)mainIndex;
      break;
    }
    case kpidClusterSize: prop = (UInt32)1 << _blockSizeLog; break;
    case kpidPhySize: prop = BlocksToBytes(_numBlocks); break;
  }
  prop.Detach(value);
  return S_OK;
  COM_TRY_END
}

STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems)
{
  *numItems = _items.Size();
  return S_OK;
}

STDMETHODIMP CHandler::GetProperty(UInt32 index, PROPID propID, PROPVARIANT *value)
{
  COM_TRY_BEGIN
  NCOM::CPropVariant prop;
  const CItem &item = _items[index];
  switch(propID)
  {
    case kpidPath:
    {
      AString s = GetString(item.Name);
      if (s.IsEmpty())
      {
        char s2[32];
        ConvertUInt32ToString(index, s2);
        s = s2;
      }
      AString type = GetString(item.Type);
      if (type == "Apple_HFS")
        type = "hfs";
      if (!type.IsEmpty())
      {
        s += '.';
        s += type;
      }
      prop = s;
      break;
    }
    case kpidSize:
    case kpidPackSize:
      prop = GetItemSize(item);
      break;
    case kpidOffset: prop = BlocksToBytes(item.StartBlock); break;
  }
  prop.Detach(value);
  return S_OK;
  COM_TRY_END
}

STDMETHODIMP CHandler::Extract(const UInt32 *indices, UInt32 numItems,
    Int32 testMode, IArchiveExtractCallback *extractCallback)
{
  COM_TRY_BEGIN
  bool allFilesMode = (numItems == (UInt32)-1);
  if (allFilesMode)
    numItems = _items.Size();
  if (numItems == 0)
    return S_OK;
  UInt64 totalSize = 0;
  UInt32 i;
  for (i = 0; i < numItems; i++)
    totalSize += GetItemSize(_items[allFilesMode ? i : indices[i]]);
  extractCallback->SetTotal(totalSize);

  totalSize = 0;
  
  NCompress::CCopyCoder *copyCoderSpec = new NCompress::CCopyCoder();
  CMyComPtr<ICompressCoder> copyCoder = copyCoderSpec;

  CLocalProgress *lps = new CLocalProgress;
  CMyComPtr<ICompressProgressInfo> progress = lps;
  lps->Init(extractCallback, false);

  CLimitedSequentialInStream *streamSpec = new CLimitedSequentialInStream;
  CMyComPtr<ISequentialInStream> inStream(streamSpec);
  streamSpec->SetStream(_stream);

  for (i = 0; i < numItems; i++)
  {
    lps->InSize = totalSize;
    lps->OutSize = totalSize;
    RINOK(lps->SetCur());
    CMyComPtr<ISequentialOutStream> outStream;
    Int32 askMode = testMode ?
        NExtract::NAskMode::kTest :
        NExtract::NAskMode::kExtract;
    Int32 index = allFilesMode ? i : indices[i];
    const CItem &item = _items[index];

    RINOK(extractCallback->GetStream(index, &outStream, askMode));
    UInt64 size = GetItemSize(item);
    totalSize += size;
    if (!testMode && !outStream)
      continue;
    RINOK(extractCallback->PrepareOperation(askMode));

    RINOK(_stream->Seek(BlocksToBytes(item.StartBlock), STREAM_SEEK_SET, NULL));
    streamSpec->Init(size);
    RINOK(copyCoder->Code(inStream, outStream, NULL, NULL, progress));
    outStream.Release();
    RINOK(extractCallback->SetOperationResult(copyCoderSpec->TotalSize == size ?
        NExtract::NOperationResult::kOK:
        NExtract::NOperationResult::kDataError));
  }
  return S_OK;
  COM_TRY_END
}

STDMETHODIMP CHandler::GetStream(UInt32 index, ISequentialInStream **stream)
{
  COM_TRY_BEGIN
  const CItem &item = _items[index];
  return CreateLimitedInStream(_stream, BlocksToBytes(item.StartBlock), GetItemSize(item), stream);
  COM_TRY_END
}

static IInArchive *CreateArc() { return new CHandler; }

static CArcInfo g_ArcInfo =
  { L"APM", L"", 0, 0xD4, { 0x50, 0x4D, 0, 0, 0, 0, 0 }, 7, false, CreateArc, 0 };

REGISTER_ARC(Apm)

}}