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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
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_fallthrough.h"
#include <algorithm>
#include <cwctype>
float FXSYS_wcstof(const wchar_t* pwsStr, int32_t iLength, int32_t* pUsedLen) {
ASSERT(pwsStr);
if (iLength < 0)
iLength = static_cast<int32_t>(wcslen(pwsStr));
if (iLength == 0)
return 0.0f;
int32_t iUsedLen = 0;
bool bNegtive = false;
switch (pwsStr[iUsedLen]) {
case '-':
bNegtive = true;
FX_FALLTHROUGH;
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 (iUsedLen < iLength &&
(pwsStr[iUsedLen] == 'e' || pwsStr[iUsedLen] == 'E')) {
++iUsedLen;
bool negative_exponent = false;
if (iUsedLen < iLength &&
(pwsStr[iUsedLen] == '-' || pwsStr[iUsedLen] == '+')) {
negative_exponent = pwsStr[iUsedLen] == '-';
++iUsedLen;
}
size_t exp_value = 0;
while (iUsedLen < iLength) {
wchar_t wch = pwsStr[iUsedLen];
if (!std::iswdigit(wch))
break;
exp_value = exp_value * 10.0f + (wch - L'0');
++iUsedLen;
}
for (size_t i = exp_value; i > 0; --i) {
if (exp_value > 0) {
if (negative_exponent)
fValue /= 10;
else
fValue *= 10;
}
}
}
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_towlower(*s1++));
wch2 = static_cast<wchar_t>(FXSYS_towlower(*s2++));
if (wch1 != wch2)
break;
}
return wch1 - wch2;
}
uint32_t FX_HashCode_GetA(const ByteStringView& str, bool bIgnoreCase) {
uint32_t dwHashCode = 0;
if (bIgnoreCase) {
for (const auto& c : str)
dwHashCode = 31 * dwHashCode + tolower(c);
} else {
for (const auto& c : str)
dwHashCode = 31 * dwHashCode + c;
}
return dwHashCode;
}
uint32_t FX_HashCode_GetW(const WideStringView& str, bool bIgnoreCase) {
uint32_t dwHashCode = 0;
if (bIgnoreCase) {
for (const auto& c : str)
dwHashCode = 1313 * dwHashCode + FXSYS_towlower(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;
}
uint32_t GetBits32(pdfium::span<const uint8_t> pData, int bitpos, int nbits) {
ASSERT(0 < nbits && nbits <= 32);
size_t bytepos = bitpos / 8;
int bitShift;
int bitMask;
int dstShift;
int bitCount = bitpos & 0x07;
if (nbits < 8 && nbits + bitCount <= 8) {
bitShift = 8 - nbits - bitCount;
bitMask = (1 << nbits) - 1;
dstShift = 0;
} else {
bitShift = 0;
int bitOffset = 8 - bitCount;
bitMask = (1 << std::min(bitOffset, nbits)) - 1;
dstShift = nbits - bitOffset;
}
uint32_t result = static_cast<uint32_t>(
(pData[bytepos++] >> bitShift & bitMask) << dstShift);
while (dstShift >= 8) {
dstShift -= 8;
result |= pData[bytepos++] << dstShift;
}
if (dstShift > 0) {
bitShift = 8 - dstShift;
bitMask = (1 << dstShift) - 1;
result |= pData[bytepos++] >> bitShift & bitMask;
}
return result;
}
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