1 // Copyright 2014 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
7 #ifndef _FXCRT_EXTENSION_IMP_
8 #define _FXCRT_EXTENSION_IMP_
10 class IFXCRT_FileAccess
13 virtual ~IFXCRT_FileAccess() {}
14 virtual FX_BOOL Open(FX_BSTR fileName, FX_DWORD dwMode) = 0;
15 virtual FX_BOOL Open(FX_WSTR fileName, FX_DWORD dwMode) = 0;
16 virtual void Close() = 0;
17 virtual void Release() = 0;
18 virtual FX_FILESIZE GetSize() const = 0;
19 virtual FX_FILESIZE GetPosition() const = 0;
20 virtual FX_FILESIZE SetPosition(FX_FILESIZE pos) = 0;
21 virtual size_t Read(void* pBuffer, size_t szBuffer) = 0;
22 virtual size_t Write(const void* pBuffer, size_t szBuffer) = 0;
23 virtual size_t ReadPos(void* pBuffer, size_t szBuffer, FX_FILESIZE pos) = 0;
24 virtual size_t WritePos(const void* pBuffer, size_t szBuffer, FX_FILESIZE pos) = 0;
25 virtual FX_BOOL Flush() = 0;
26 virtual FX_BOOL Truncate(FX_FILESIZE szFile) = 0;
28 IFXCRT_FileAccess* FXCRT_FileAccess_Create();
29 class CFX_CRTFileStream FX_FINAL : public IFX_FileStream, public CFX_Object
32 CFX_CRTFileStream(IFXCRT_FileAccess* pFA) : m_pFile(pFA), m_dwCount(1), m_bUseRange(FALSE), m_nOffset(0), m_nSize(0) {}
39 virtual IFX_FileStream* Retain() FX_OVERRIDE
44 virtual void Release() FX_OVERRIDE
46 FX_DWORD nCount = -- m_dwCount;
51 virtual FX_FILESIZE GetSize() FX_OVERRIDE
53 return m_bUseRange ? m_nSize : m_pFile->GetSize();
55 virtual FX_BOOL IsEOF() FX_OVERRIDE
57 return GetPosition() >= GetSize();
59 virtual FX_FILESIZE GetPosition() FX_OVERRIDE
61 FX_FILESIZE pos = m_pFile->GetPosition();
67 virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) FX_OVERRIDE
69 if (offset < 0 || size < 0) {
73 FX_SAFE_FILESIZE pos = size;
76 if (!pos.IsValid() || pos.ValueOrDie() > m_pFile->GetSize()) {
80 m_nOffset = offset, m_nSize = size;
82 m_pFile->SetPosition(m_nOffset);
85 virtual void ClearRange() FX_OVERRIDE
89 virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) FX_OVERRIDE
91 if (m_bUseRange && offset < 0) {
94 FX_SAFE_FILESIZE pos = offset;
98 if (!pos.IsValid() || pos.ValueOrDie() > (size_t)GetSize()) {
102 return (FX_BOOL)m_pFile->ReadPos(buffer, size, pos.ValueOrDie());
104 virtual size_t ReadBlock(void* buffer, size_t size) FX_OVERRIDE
107 FX_FILESIZE availSize = m_nOffset + m_nSize - m_pFile->GetPosition();
108 if ((size_t)availSize < size) {
109 size -= size - (size_t)availSize;
112 return m_pFile->Read(buffer, size);
114 virtual FX_BOOL WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) FX_OVERRIDE
119 return (FX_BOOL)m_pFile->WritePos(buffer, size, offset);
121 virtual FX_BOOL Flush() FX_OVERRIDE
123 return m_pFile->Flush();
125 IFXCRT_FileAccess* m_pFile;
128 FX_FILESIZE m_nOffset;
131 #define FX_MEMSTREAM_BlockSize (64 * 1024)
132 #define FX_MEMSTREAM_Consecutive 0x01
133 #define FX_MEMSTREAM_TakeOver 0x02
134 class CFX_MemoryStream FX_FINAL : public IFX_MemoryStream, public CFX_Object
137 CFX_MemoryStream(FX_BOOL bConsecutive)
142 , m_nGrowSize(FX_MEMSTREAM_BlockSize)
145 m_dwFlags = FX_MEMSTREAM_TakeOver | (bConsecutive ? FX_MEMSTREAM_Consecutive : 0);
147 CFX_MemoryStream(FX_LPBYTE pBuffer, size_t nSize, FX_BOOL bTakeOver)
149 , m_nTotalSize(nSize)
152 , m_nGrowSize(FX_MEMSTREAM_BlockSize)
155 m_Blocks.Add(pBuffer);
156 m_dwFlags = FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
160 if (m_dwFlags & FX_MEMSTREAM_TakeOver) {
161 for (FX_INT32 i = 0; i < m_Blocks.GetSize(); i++) {
162 FX_Free((FX_LPBYTE)m_Blocks[i]);
165 m_Blocks.RemoveAll();
167 virtual IFX_FileStream* Retain() FX_OVERRIDE
172 virtual void Release() FX_OVERRIDE
174 FX_DWORD nCount = -- m_dwCount;
180 virtual FX_FILESIZE GetSize() FX_OVERRIDE
182 return m_bUseRange ? (FX_FILESIZE) m_nSize : (FX_FILESIZE)m_nCurSize;
184 virtual FX_BOOL IsEOF() FX_OVERRIDE
186 return m_nCurPos >= (size_t)GetSize();
188 virtual FX_FILESIZE GetPosition() FX_OVERRIDE
190 FX_FILESIZE pos = (FX_FILESIZE)m_nCurPos;
192 pos -= (FX_FILESIZE)m_nOffset;
196 virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) FX_OVERRIDE
198 if (offset < 0 || size < 0) {
201 FX_SAFE_FILESIZE range = size;
203 if (!range.IsValid() || range.ValueOrDie() > m_nCurSize) {
207 m_nOffset = (size_t)offset, m_nSize = (size_t)size;
209 m_nCurPos = m_nOffset;
212 virtual void ClearRange() FX_OVERRIDE
216 virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) FX_OVERRIDE
218 if (!buffer || !size) {
222 FX_SAFE_FILESIZE safeOffset = offset;
224 safeOffset += m_nOffset;
227 if (!safeOffset.IsValid()) {
231 offset = safeOffset.ValueOrDie();
233 FX_SAFE_SIZE_T newPos = size;
235 if (!newPos.IsValid() || newPos.ValueOrDefault(0) == 0 || newPos.ValueOrDie() > m_nCurSize) {
239 m_nCurPos = newPos.ValueOrDie();
240 if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
241 FXSYS_memcpy32(buffer, (FX_LPBYTE)m_Blocks[0] + (size_t)offset, size);
244 size_t nStartBlock = (size_t)offset / m_nGrowSize;
245 offset -= (FX_FILESIZE)(nStartBlock * m_nGrowSize);
247 size_t nRead = m_nGrowSize - (size_t)offset;
251 FXSYS_memcpy32(buffer, (FX_LPBYTE)m_Blocks[(int)nStartBlock] + (size_t)offset, nRead);
252 buffer = ((FX_LPBYTE)buffer) + nRead;
259 virtual size_t ReadBlock(void* buffer, size_t size) FX_OVERRIDE
261 if (m_nCurPos >= m_nCurSize) {
265 size_t availSize = m_nOffset + m_nSize - m_nCurPos;
266 if (availSize < size) {
267 size -= size - (size_t)availSize;
270 size_t nRead = FX_MIN(size, m_nCurSize - m_nCurPos);
271 if (!ReadBlock(buffer, (FX_INT32)m_nCurPos, nRead)) {
276 virtual FX_BOOL WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) FX_OVERRIDE
278 if (!buffer || !size) {
282 offset += (FX_FILESIZE)m_nOffset;
284 if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
285 FX_SAFE_SIZE_T newPos = size;
287 if (!newPos.IsValid())
290 m_nCurPos = newPos.ValueOrDie();
291 if (m_nCurPos > m_nTotalSize) {
292 m_nTotalSize = (m_nCurPos + m_nGrowSize - 1) / m_nGrowSize * m_nGrowSize;
293 if (m_Blocks.GetSize() < 1) {
294 void* block = FX_Alloc(FX_BYTE, m_nTotalSize);
297 m_Blocks[0] = FX_Realloc(FX_BYTE, m_Blocks[0], m_nTotalSize);
300 m_Blocks.RemoveAll();
304 FXSYS_memcpy32((FX_LPBYTE)m_Blocks[0] + (size_t)offset, buffer, size);
305 if (m_nCurSize < m_nCurPos) {
306 m_nCurSize = m_nCurPos;
311 FX_SAFE_SIZE_T newPos = size;
313 if (!newPos.IsValid()) {
317 if (!ExpandBlocks(newPos.ValueOrDie())) {
320 m_nCurPos = newPos.ValueOrDie();
321 size_t nStartBlock = (size_t)offset / m_nGrowSize;
322 offset -= (FX_FILESIZE)(nStartBlock * m_nGrowSize);
324 size_t nWrite = m_nGrowSize - (size_t)offset;
328 FXSYS_memcpy32((FX_LPBYTE)m_Blocks[(int)nStartBlock] + (size_t)offset, buffer, nWrite);
329 buffer = ((FX_LPBYTE)buffer) + nWrite;
336 virtual FX_BOOL Flush() FX_OVERRIDE
340 virtual FX_BOOL IsConsecutive() const FX_OVERRIDE
342 return m_dwFlags & FX_MEMSTREAM_Consecutive;
344 virtual void EstimateSize(size_t nInitSize, size_t nGrowSize) FX_OVERRIDE
346 if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
347 if (m_Blocks.GetSize() < 1) {
348 FX_LPBYTE pBlock = FX_Alloc(FX_BYTE, FX_MAX(nInitSize, 4096));
350 m_Blocks.Add(pBlock);
353 m_nGrowSize = FX_MAX(nGrowSize, 4096);
354 } else if (m_Blocks.GetSize() < 1) {
355 m_nGrowSize = FX_MAX(nGrowSize, 4096);
358 virtual FX_LPBYTE GetBuffer() const FX_OVERRIDE
360 return m_Blocks.GetSize() ? (FX_LPBYTE)m_Blocks[0] : NULL;
362 virtual void AttachBuffer(FX_LPBYTE pBuffer, size_t nSize, FX_BOOL bTakeOver = FALSE) FX_OVERRIDE
364 if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
367 m_Blocks.RemoveAll();
368 m_Blocks.Add(pBuffer);
369 m_nTotalSize = m_nCurSize = nSize;
371 m_dwFlags = FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
374 virtual void DetachBuffer() FX_OVERRIDE
376 if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
379 m_Blocks.RemoveAll();
380 m_nTotalSize = m_nCurSize = m_nCurPos = 0;
381 m_dwFlags = FX_MEMSTREAM_TakeOver;
385 CFX_PtrArray m_Blocks;
395 FX_BOOL ExpandBlocks(size_t size)
397 if (m_nCurSize < size) {
400 if (size <= m_nTotalSize) {
403 FX_INT32 iCount = m_Blocks.GetSize();
404 size = (size - m_nTotalSize + m_nGrowSize - 1) / m_nGrowSize;
405 m_Blocks.SetSize(m_Blocks.GetSize() + (FX_INT32)size);
407 FX_LPBYTE pBlock = FX_Alloc(FX_BYTE, m_nGrowSize);
411 m_Blocks.SetAt(iCount ++, pBlock);
412 m_nTotalSize += m_nGrowSize;
422 #define MT_Matrix_A 0x9908b0df
423 #define MT_Upper_Mask 0x80000000
424 #define MT_Lower_Mask 0x7fffffff
425 typedef struct _FX_MTRANDOMCONTEXT {
426 _FX_MTRANDOMCONTEXT()
434 } FX_MTRANDOMCONTEXT, * FX_LPMTRANDOMCONTEXT;
435 typedef FX_MTRANDOMCONTEXT const * FX_LPCMTRANDOMCONTEXT;
436 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
437 FX_BOOL FX_GenerateCryptoRandom(FX_LPDWORD pBuffer, FX_INT32 iCount);