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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_SRC_FXCRT_EXTENSION_H_
#define CORE_SRC_FXCRT_EXTENSION_H_
#include "../../include/fxcrt/fx_safe_types.h"
class IFXCRT_FileAccess
{
public:
virtual ~IFXCRT_FileAccess() {}
virtual FX_BOOL Open(FX_BSTR fileName, FX_DWORD dwMode) = 0;
virtual FX_BOOL Open(FX_WSTR fileName, FX_DWORD dwMode) = 0;
virtual void Close() = 0;
virtual void Release() = 0;
virtual FX_FILESIZE GetSize() const = 0;
virtual FX_FILESIZE GetPosition() const = 0;
virtual FX_FILESIZE SetPosition(FX_FILESIZE pos) = 0;
virtual size_t Read(void* pBuffer, size_t szBuffer) = 0;
virtual size_t Write(const void* pBuffer, size_t szBuffer) = 0;
virtual size_t ReadPos(void* pBuffer, size_t szBuffer, FX_FILESIZE pos) = 0;
virtual size_t WritePos(const void* pBuffer, size_t szBuffer, FX_FILESIZE pos) = 0;
virtual FX_BOOL Flush() = 0;
virtual FX_BOOL Truncate(FX_FILESIZE szFile) = 0;
};
IFXCRT_FileAccess* FXCRT_FileAccess_Create();
class CFX_CRTFileStream final : public IFX_FileStream
{
public:
CFX_CRTFileStream(IFXCRT_FileAccess* pFA) : m_pFile(pFA), m_dwCount(1), m_bUseRange(FALSE), m_nOffset(0), m_nSize(0) {}
~CFX_CRTFileStream()
{
if (m_pFile) {
m_pFile->Release();
}
}
virtual IFX_FileStream* Retain() override
{
m_dwCount ++;
return this;
}
virtual void Release() override
{
FX_DWORD nCount = -- m_dwCount;
if (!nCount) {
delete this;
}
}
virtual FX_FILESIZE GetSize() override
{
return m_bUseRange ? m_nSize : m_pFile->GetSize();
}
virtual FX_BOOL IsEOF() override
{
return GetPosition() >= GetSize();
}
virtual FX_FILESIZE GetPosition() override
{
FX_FILESIZE pos = m_pFile->GetPosition();
if (m_bUseRange) {
pos -= m_nOffset;
}
return pos;
}
virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) override
{
if (offset < 0 || size < 0) {
return FALSE;
}
FX_SAFE_FILESIZE pos = size;
pos += offset;
if (!pos.IsValid() || pos.ValueOrDie() > m_pFile->GetSize()) {
return FALSE;
}
m_nOffset = offset, m_nSize = size;
m_bUseRange = TRUE;
m_pFile->SetPosition(m_nOffset);
return TRUE;
}
virtual void ClearRange() override
{
m_bUseRange = FALSE;
}
virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override
{
if (m_bUseRange && offset < 0) {
return FALSE;
}
FX_SAFE_FILESIZE pos = offset;
if (m_bUseRange) {
pos += m_nOffset;
if (!pos.IsValid() || pos.ValueOrDie() > (size_t)GetSize()) {
return FALSE;
}
}
return (FX_BOOL)m_pFile->ReadPos(buffer, size, pos.ValueOrDie());
}
virtual size_t ReadBlock(void* buffer, size_t size) override
{
if (m_bUseRange) {
FX_FILESIZE availSize = m_nOffset + m_nSize - m_pFile->GetPosition();
if ((size_t)availSize < size) {
size -= size - (size_t)availSize;
}
}
return m_pFile->Read(buffer, size);
}
virtual FX_BOOL WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override
{
if (m_bUseRange) {
offset += m_nOffset;
}
return (FX_BOOL)m_pFile->WritePos(buffer, size, offset);
}
virtual FX_BOOL Flush() override
{
return m_pFile->Flush();
}
IFXCRT_FileAccess* m_pFile;
FX_DWORD m_dwCount;
FX_BOOL m_bUseRange;
FX_FILESIZE m_nOffset;
FX_FILESIZE m_nSize;
};
#define FX_MEMSTREAM_BlockSize (64 * 1024)
#define FX_MEMSTREAM_Consecutive 0x01
#define FX_MEMSTREAM_TakeOver 0x02
class CFX_MemoryStream final : public IFX_MemoryStream
{
public:
CFX_MemoryStream(FX_BOOL bConsecutive)
: m_dwCount(1)
, m_nTotalSize(0)
, m_nCurSize(0)
, m_nCurPos(0)
, m_nGrowSize(FX_MEMSTREAM_BlockSize)
, m_bUseRange(FALSE)
{
m_dwFlags = FX_MEMSTREAM_TakeOver | (bConsecutive ? FX_MEMSTREAM_Consecutive : 0);
}
CFX_MemoryStream(FX_LPBYTE pBuffer, size_t nSize, FX_BOOL bTakeOver)
: m_dwCount(1)
, m_nTotalSize(nSize)
, m_nCurSize(nSize)
, m_nCurPos(0)
, m_nGrowSize(FX_MEMSTREAM_BlockSize)
, m_bUseRange(FALSE)
{
m_Blocks.Add(pBuffer);
m_dwFlags = FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
}
~CFX_MemoryStream()
{
if (m_dwFlags & FX_MEMSTREAM_TakeOver) {
for (FX_INT32 i = 0; i < m_Blocks.GetSize(); i++) {
FX_Free((FX_LPBYTE)m_Blocks[i]);
}
}
m_Blocks.RemoveAll();
}
virtual IFX_FileStream* Retain() override
{
m_dwCount ++;
return this;
}
virtual void Release() override
{
FX_DWORD nCount = -- m_dwCount;
if (nCount) {
return;
}
delete this;
}
virtual FX_FILESIZE GetSize() override
{
return m_bUseRange ? (FX_FILESIZE) m_nSize : (FX_FILESIZE)m_nCurSize;
}
virtual FX_BOOL IsEOF() override
{
return m_nCurPos >= (size_t)GetSize();
}
virtual FX_FILESIZE GetPosition() override
{
FX_FILESIZE pos = (FX_FILESIZE)m_nCurPos;
if (m_bUseRange) {
pos -= (FX_FILESIZE)m_nOffset;
}
return pos;
}
virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) override
{
if (offset < 0 || size < 0) {
return FALSE;
}
FX_SAFE_FILESIZE range = size;
range += offset;
if (!range.IsValid() || range.ValueOrDie() > m_nCurSize) {
return FALSE;
}
m_nOffset = (size_t)offset, m_nSize = (size_t)size;
m_bUseRange = TRUE;
m_nCurPos = m_nOffset;
return TRUE;
}
virtual void ClearRange() override
{
m_bUseRange = FALSE;
}
virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override
{
if (!buffer || !size) {
return FALSE;
}
FX_SAFE_FILESIZE safeOffset = offset;
if (m_bUseRange) {
safeOffset += m_nOffset;
}
if (!safeOffset.IsValid()) {
return FALSE;
}
offset = safeOffset.ValueOrDie();
FX_SAFE_SIZE_T newPos = size;
newPos += offset;
if (!newPos.IsValid() || newPos.ValueOrDefault(0) == 0 || newPos.ValueOrDie() > m_nCurSize) {
return FALSE;
}
m_nCurPos = newPos.ValueOrDie();
if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
FXSYS_memcpy32(buffer, (FX_LPBYTE)m_Blocks[0] + (size_t)offset, size);
return TRUE;
}
size_t nStartBlock = (size_t)offset / m_nGrowSize;
offset -= (FX_FILESIZE)(nStartBlock * m_nGrowSize);
while (size) {
size_t nRead = m_nGrowSize - (size_t)offset;
if (nRead > size) {
nRead = size;
}
FXSYS_memcpy32(buffer, (FX_LPBYTE)m_Blocks[(int)nStartBlock] + (size_t)offset, nRead);
buffer = ((FX_LPBYTE)buffer) + nRead;
size -= nRead;
nStartBlock ++;
offset = 0;
}
return TRUE;
}
virtual size_t ReadBlock(void* buffer, size_t size) override
{
if (m_nCurPos >= m_nCurSize) {
return 0;
}
if (m_bUseRange) {
size_t availSize = m_nOffset + m_nSize - m_nCurPos;
if (availSize < size) {
size -= size - (size_t)availSize;
}
}
size_t nRead = FX_MIN(size, m_nCurSize - m_nCurPos);
if (!ReadBlock(buffer, (FX_INT32)m_nCurPos, nRead)) {
return 0;
}
return nRead;
}
virtual FX_BOOL WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override
{
if (!buffer || !size) {
return FALSE;
}
if (m_bUseRange) {
offset += (FX_FILESIZE)m_nOffset;
}
if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
FX_SAFE_SIZE_T newPos = size;
newPos += offset;
if (!newPos.IsValid())
return FALSE;
m_nCurPos = newPos.ValueOrDie();
if (m_nCurPos > m_nTotalSize) {
m_nTotalSize = (m_nCurPos + m_nGrowSize - 1) / m_nGrowSize * m_nGrowSize;
if (m_Blocks.GetSize() < 1) {
void* block = FX_Alloc(FX_BYTE, m_nTotalSize);
m_Blocks.Add(block);
} else {
m_Blocks[0] = FX_Realloc(FX_BYTE, m_Blocks[0], m_nTotalSize);
}
if (!m_Blocks[0]) {
m_Blocks.RemoveAll();
return FALSE;
}
}
FXSYS_memcpy32((FX_LPBYTE)m_Blocks[0] + (size_t)offset, buffer, size);
if (m_nCurSize < m_nCurPos) {
m_nCurSize = m_nCurPos;
}
return TRUE;
}
FX_SAFE_SIZE_T newPos = size;
newPos += offset;
if (!newPos.IsValid()) {
return FALSE;
}
if (!ExpandBlocks(newPos.ValueOrDie())) {
return FALSE;
}
m_nCurPos = newPos.ValueOrDie();
size_t nStartBlock = (size_t)offset / m_nGrowSize;
offset -= (FX_FILESIZE)(nStartBlock * m_nGrowSize);
while (size) {
size_t nWrite = m_nGrowSize - (size_t)offset;
if (nWrite > size) {
nWrite = size;
}
FXSYS_memcpy32((FX_LPBYTE)m_Blocks[(int)nStartBlock] + (size_t)offset, buffer, nWrite);
buffer = ((FX_LPBYTE)buffer) + nWrite;
size -= nWrite;
nStartBlock ++;
offset = 0;
}
return TRUE;
}
virtual FX_BOOL Flush() override
{
return TRUE;
}
virtual FX_BOOL IsConsecutive() const override
{
return m_dwFlags & FX_MEMSTREAM_Consecutive;
}
virtual void EstimateSize(size_t nInitSize, size_t nGrowSize) override
{
if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
if (m_Blocks.GetSize() < 1) {
FX_LPBYTE pBlock = FX_Alloc(FX_BYTE, FX_MAX(nInitSize, 4096));
m_Blocks.Add(pBlock);
}
m_nGrowSize = FX_MAX(nGrowSize, 4096);
} else if (m_Blocks.GetSize() < 1) {
m_nGrowSize = FX_MAX(nGrowSize, 4096);
}
}
virtual FX_LPBYTE GetBuffer() const override
{
return m_Blocks.GetSize() ? (FX_LPBYTE)m_Blocks[0] : NULL;
}
virtual void AttachBuffer(FX_LPBYTE pBuffer, size_t nSize, FX_BOOL bTakeOver = FALSE) override
{
if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
return;
}
m_Blocks.RemoveAll();
m_Blocks.Add(pBuffer);
m_nTotalSize = m_nCurSize = nSize;
m_nCurPos = 0;
m_dwFlags = FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
ClearRange();
}
virtual void DetachBuffer() override
{
if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
return;
}
m_Blocks.RemoveAll();
m_nTotalSize = m_nCurSize = m_nCurPos = 0;
m_dwFlags = FX_MEMSTREAM_TakeOver;
ClearRange();
}
protected:
CFX_PtrArray m_Blocks;
FX_DWORD m_dwCount;
size_t m_nTotalSize;
size_t m_nCurSize;
size_t m_nCurPos;
size_t m_nGrowSize;
FX_DWORD m_dwFlags;
FX_BOOL m_bUseRange;
size_t m_nOffset;
size_t m_nSize;
FX_BOOL ExpandBlocks(size_t size)
{
if (m_nCurSize < size) {
m_nCurSize = size;
}
if (size <= m_nTotalSize) {
return TRUE;
}
FX_INT32 iCount = m_Blocks.GetSize();
size = (size - m_nTotalSize + m_nGrowSize - 1) / m_nGrowSize;
m_Blocks.SetSize(m_Blocks.GetSize() + (FX_INT32)size);
while (size --) {
FX_LPBYTE pBlock = FX_Alloc(FX_BYTE, m_nGrowSize);
m_Blocks.SetAt(iCount ++, pBlock);
m_nTotalSize += m_nGrowSize;
}
return TRUE;
}
};
#ifdef __cplusplus
extern "C" {
#endif
#define MT_N 848
#define MT_M 456
#define MT_Matrix_A 0x9908b0df
#define MT_Upper_Mask 0x80000000
#define MT_Lower_Mask 0x7fffffff
typedef struct _FX_MTRANDOMCONTEXT {
_FX_MTRANDOMCONTEXT()
{
mti = MT_N + 1;
bHaveSeed = FALSE;
}
FX_DWORD mti;
FX_BOOL bHaveSeed;
FX_DWORD mt[MT_N];
} FX_MTRANDOMCONTEXT, * FX_LPMTRANDOMCONTEXT;
typedef FX_MTRANDOMCONTEXT const * FX_LPCMTRANDOMCONTEXT;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
FX_BOOL FX_GenerateCryptoRandom(FX_LPDWORD pBuffer, FX_INT32 iCount);
#endif
#ifdef __cplusplus
}
#endif
#endif // CORE_SRC_FXCRT_EXTENSION_H_
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