summaryrefslogtreecommitdiff
path: root/core/fxcrt/fx_extension.cpp
blob: 10b568ec9e4fe894d8009061e584fae75fa211b0 (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
// 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

#include "core/fxcrt/fx_extension.h"

#include <cwctype>

#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
#include <wincrypt.h>
#else
#include <ctime>
#endif

#define MT_N 848
#define MT_M 456
#define MT_Matrix_A 0x9908b0df
#define MT_Upper_Mask 0x80000000
#define MT_Lower_Mask 0x7fffffff

namespace {

struct FX_MTRANDOMCONTEXT {
  FX_MTRANDOMCONTEXT() {
    mti = MT_N + 1;
    bHaveSeed = false;
  }

  uint32_t mti;
  bool bHaveSeed;
  uint32_t mt[MT_N];
};

#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
bool GenerateCryptoRandom(uint32_t* pBuffer, int32_t iCount) {
  HCRYPTPROV hCP = 0;
  if (!::CryptAcquireContext(&hCP, nullptr, nullptr, PROV_RSA_FULL, 0) ||
      !hCP) {
    return false;
  }
  ::CryptGenRandom(hCP, iCount * sizeof(uint32_t),
                   reinterpret_cast<uint8_t*>(pBuffer));
  ::CryptReleaseContext(hCP, 0);
  return true;
}
#endif

}  // namespace

float FXSYS_wcstof(const wchar_t* pwsStr, int32_t iLength, int32_t* pUsedLen) {
  ASSERT(pwsStr);
  if (iLength < 0)
    iLength = static_cast<int32_t>(FXSYS_wcslen(pwsStr));
  if (iLength == 0)
    return 0.0f;

  int32_t iUsedLen = 0;
  bool bNegtive = false;
  switch (pwsStr[iUsedLen]) {
    case '-':
      bNegtive = true;
    case '+':
      iUsedLen++;
      break;
  }

  float fValue = 0.0f;
  while (iUsedLen < iLength) {
    wchar_t wch = pwsStr[iUsedLen];
    if (!std::iswdigit(wch))
      break;

    fValue = fValue * 10.0f + (wch - L'0');
    iUsedLen++;
  }

  if (iUsedLen < iLength && pwsStr[iUsedLen] == L'.') {
    float fPrecise = 0.1f;
    while (++iUsedLen < iLength) {
      wchar_t wch = pwsStr[iUsedLen];
      if (!std::iswdigit(wch))
        break;

      fValue += (wch - L'0') * fPrecise;
      fPrecise *= 0.1f;
    }
  }
  if (pUsedLen)
    *pUsedLen = iUsedLen;

  return bNegtive ? -fValue : fValue;
}

wchar_t* FXSYS_wcsncpy(wchar_t* dstStr, const wchar_t* srcStr, size_t count) {
  ASSERT(dstStr && srcStr && count > 0);
  for (size_t i = 0; i < count; ++i)
    if ((dstStr[i] = srcStr[i]) == L'\0')
      break;
  return dstStr;
}

int32_t FXSYS_wcsnicmp(const wchar_t* s1, const wchar_t* s2, size_t count) {
  ASSERT(s1 && s2 && count > 0);
  wchar_t wch1 = 0, wch2 = 0;
  while (count-- > 0) {
    wch1 = static_cast<wchar_t>(FXSYS_tolower(*s1++));
    wch2 = static_cast<wchar_t>(FXSYS_tolower(*s2++));
    if (wch1 != wch2)
      break;
  }
  return wch1 - wch2;
}

uint32_t FX_HashCode_GetA(const CFX_ByteStringC& str, bool bIgnoreCase) {
  uint32_t dwHashCode = 0;
  if (bIgnoreCase) {
    for (const auto& c : str)
      dwHashCode = 31 * dwHashCode + FXSYS_tolower(c);
  } else {
    for (const auto& c : str)
      dwHashCode = 31 * dwHashCode + c;
  }
  return dwHashCode;
}

uint32_t FX_HashCode_GetW(const CFX_WideStringC& str, bool bIgnoreCase) {
  uint32_t dwHashCode = 0;
  if (bIgnoreCase) {
    for (const auto& c : str)
      dwHashCode = 1313 * dwHashCode + FXSYS_tolower(c);
  } else {
    for (const auto& c : str)
      dwHashCode = 1313 * dwHashCode + c;
  }
  return dwHashCode;
}

void FXSYS_IntToTwoHexChars(uint8_t n, char* buf) {
  static const char kHex[] = "0123456789ABCDEF";
  buf[0] = kHex[n / 16];
  buf[1] = kHex[n % 16];
}

void FXSYS_IntToFourHexChars(uint16_t n, char* buf) {
  FXSYS_IntToTwoHexChars(n / 256, buf);
  FXSYS_IntToTwoHexChars(n % 256, buf + 2);
}

size_t FXSYS_ToUTF16BE(uint32_t unicode, char* buf) {
  ASSERT(unicode <= 0xD7FF || (unicode > 0xDFFF && unicode <= 0x10FFFF));
  if (unicode <= 0xFFFF) {
    FXSYS_IntToFourHexChars(unicode, buf);
    return 4;
  }
  unicode -= 0x010000;
  // High ten bits plus 0xD800
  FXSYS_IntToFourHexChars(0xD800 + unicode / 0x400, buf);
  // Low ten bits plus 0xDC00
  FXSYS_IntToFourHexChars(0xDC00 + unicode % 0x400, buf + 4);
  return 8;
}

void* FX_Random_MT_Start(uint32_t dwSeed) {
  FX_MTRANDOMCONTEXT* pContext = FX_Alloc(FX_MTRANDOMCONTEXT, 1);
  pContext->mt[0] = dwSeed;
  uint32_t& i = pContext->mti;
  uint32_t* pBuf = pContext->mt;
  for (i = 1; i < MT_N; i++)
    pBuf[i] = (1812433253UL * (pBuf[i - 1] ^ (pBuf[i - 1] >> 30)) + i);

  pContext->bHaveSeed = true;
  return pContext;
}

uint32_t FX_Random_MT_Generate(void* pContext) {
  ASSERT(pContext);
  FX_MTRANDOMCONTEXT* pMTC = static_cast<FX_MTRANDOMCONTEXT*>(pContext);
  uint32_t v;
  static uint32_t mag[2] = {0, MT_Matrix_A};
  uint32_t& mti = pMTC->mti;
  uint32_t* pBuf = pMTC->mt;
  if ((int)mti < 0 || mti >= MT_N) {
    if (mti > MT_N && !pMTC->bHaveSeed)
      return 0;

    uint32_t kk;
    for (kk = 0; kk < MT_N - MT_M; kk++) {
      v = (pBuf[kk] & MT_Upper_Mask) | (pBuf[kk + 1] & MT_Lower_Mask);
      pBuf[kk] = pBuf[kk + MT_M] ^ (v >> 1) ^ mag[v & 1];
    }
    for (; kk < MT_N - 1; kk++) {
      v = (pBuf[kk] & MT_Upper_Mask) | (pBuf[kk + 1] & MT_Lower_Mask);
      pBuf[kk] = pBuf[kk + (MT_M - MT_N)] ^ (v >> 1) ^ mag[v & 1];
    }
    v = (pBuf[MT_N - 1] & MT_Upper_Mask) | (pBuf[0] & MT_Lower_Mask);
    pBuf[MT_N - 1] = pBuf[MT_M - 1] ^ (v >> 1) ^ mag[v & 1];
    mti = 0;
  }
  v = pBuf[mti++];
  v ^= (v >> 11);
  v ^= (v << 7) & 0x9d2c5680UL;
  v ^= (v << 15) & 0xefc60000UL;
  v ^= (v >> 18);
  return v;
}

void FX_Random_MT_Close(void* pContext) {
  ASSERT(pContext);
  FX_Free(pContext);
}

void FX_Random_GenerateMT(uint32_t* pBuffer, int32_t iCount) {
  uint32_t dwSeed;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
  if (!GenerateCryptoRandom(&dwSeed, 1))
    FX_Random_GenerateBase(&dwSeed, 1);
#else
  FX_Random_GenerateBase(&dwSeed, 1);
#endif
  void* pContext = FX_Random_MT_Start(dwSeed);
  while (iCount-- > 0)
    *pBuffer++ = FX_Random_MT_Generate(pContext);

  FX_Random_MT_Close(pContext);
}

void FX_Random_GenerateBase(uint32_t* pBuffer, int32_t iCount) {
#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
  SYSTEMTIME st1, st2;
  ::GetSystemTime(&st1);
  do {
    ::GetSystemTime(&st2);
  } while (memcmp(&st1, &st2, sizeof(SYSTEMTIME)) == 0);
  uint32_t dwHash1 =
      FX_HashCode_GetA(CFX_ByteStringC((uint8_t*)&st1, sizeof(st1)), true);
  uint32_t dwHash2 =
      FX_HashCode_GetA(CFX_ByteStringC((uint8_t*)&st2, sizeof(st2)), true);
  ::srand((dwHash1 << 16) | (uint32_t)dwHash2);
#else
  time_t tmLast = time(nullptr);
  time_t tmCur;
  while ((tmCur = time(nullptr)) == tmLast)
    continue;

  ::srand((tmCur << 16) | (tmLast & 0xFFFF));
#endif
  while (iCount-- > 0)
    *pBuffer++ = static_cast<uint32_t>((::rand() << 16) | (::rand() & 0xFFFF));
}

#ifdef PDF_ENABLE_XFA
void FX_GUID_CreateV4(FX_GUID* pGUID) {
  FX_Random_GenerateMT((uint32_t*)pGUID, 4);
  uint8_t& b = ((uint8_t*)pGUID)[6];
  b = (b & 0x0F) | 0x40;
}

CFX_ByteString FX_GUID_ToString(const FX_GUID* pGUID, bool bSeparator) {
  CFX_ByteString bsStr;
  char* pBuf = bsStr.GetBuffer(40);
  for (int32_t i = 0; i < 16; i++) {
    uint8_t b = reinterpret_cast<const uint8_t*>(pGUID)[i];
    FXSYS_IntToTwoHexChars(b, pBuf);
    pBuf += 2;
    if (bSeparator && (i == 3 || i == 5 || i == 7 || i == 9))
      *pBuf++ = L'-';
  }
  bsStr.ReleaseBuffer(bSeparator ? 36 : 32);
  return bsStr;
}
#endif  // PDF_ENABLE_XFA