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cuberite-2a/source/StringUtils.cpp

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// StringUtils.cpp
// Implements the various string helper functions:
#include "Globals.h"
#if defined(ANDROID_NDK)
#include <ctype.h>
#endif
AString & AppendVPrintf(AString & str, const char *format, va_list args)
{
ASSERT(format != NULL);
char buffer[2048];
size_t len;
#ifdef _MSC_VER
// MS CRT provides secure printf that doesn't behave like in the C99 standard
if ((len = _vsnprintf_s(buffer, ARRAYCOUNT(buffer), _TRUNCATE, format, args)) != -1)
#else // _MSC_VER
if ((len = vsnprintf(buffer, ARRAYCOUNT(buffer), format, args)) < ARRAYCOUNT(buffer))
#endif // else _MSC_VER
{
// The result did fit into the static buffer
str.append(buffer, len);
return str;
}
// The result did not fit into the static buffer
#ifdef _MSC_VER
// for MS CRT, we need to calculate the result length
len = _vscprintf(format, args);
if (len == -1)
{
return str;
}
#endif // _MSC_VER
// Allocate a buffer and printf into it:
str.resize(len + 1);
// HACK: we're accessing AString's internal buffer in a way that is NOT guaranteed to always work. But it works on all STL implementations tested.
// I can't think of any other way that is safe, doesn't allocate twice as much space as needed and doesn't use C++11 features like the move constructor
#ifdef _MSC_VER
vsprintf_s((char *)str.data(), len + 1, format, args);
#else // _MSC_VER
vsnprintf((char *)str.data(), len + 1, format, args);
#endif // else _MSC_VER
str.resize(len);
return str;
}
AString & Printf(AString & str, const char *format, ...)
{
str.clear();
va_list args;
va_start(args, format);
std::string &retval = AppendVPrintf(str, format, args);
va_end(args);
return retval;
}
AString & AppendPrintf(AString &str, const char *format, ...)
{
va_list args;
va_start(args, format);
std::string &retval = AppendVPrintf(str, format, args);
va_end(args);
return retval;
}
AStringVector StringSplit(const AString & str, const AString & delim)
{
AStringVector results;
size_t cutAt = 0;
size_t Prev = 0;
while ((cutAt = str.find_first_of(delim, Prev)) != str.npos)
{
results.push_back(str.substr(Prev, cutAt - Prev));
Prev = cutAt + delim.length();
}
if (Prev < str.length())
{
results.push_back(str.substr(Prev));
}
return results;
}
AString TrimString(const AString & str)
{
size_t len = str.length();
size_t start = 0;
while (start < len)
{
if (str[start] > 32)
{
break;
}
++start;
}
if (start == len)
{
return "";
}
size_t end = len;
while (end >= start)
{
if (str[end] > 32)
{
break;
}
--end;
}
return str.substr(start, end - start + 1);
}
AString & StrToUpper(AString & s)
{
AString::iterator i = s.begin();
AString::iterator end = s.end();
while (i != end)
{
*i = (char)toupper(*i);
++i;
}
return s;
}
int NoCaseCompare(const AString & s1, const AString & s2)
{
#ifdef _MSC_VER
// MSVC has stricmp that compares case-insensitive:
return _stricmp(s1.c_str(), s2.c_str());
#else
// Do it the hard way:
AString s1Copy(s1);
AString s2Copy(s2);
return StrToUpper(s1Copy).compare(StrToUpper(s2Copy));
#endif // else _MSC_VER
}
unsigned int RateCompareString(const AString & s1, const AString & s2 )
{
unsigned int MatchedLetters = 0;
unsigned int s1Length = s1.length();
if( s1Length > s2.length() ) return 0; // Definitely not a match
for (unsigned int i = 0; i < s1Length; i++)
{
char c1 = (char)toupper( s1[i] );
char c2 = (char)toupper( s2[i] );
if( c1 == c2 )
{
++MatchedLetters;
}
else
{
break;
}
}
return MatchedLetters;
}
void ReplaceString(AString & iHayStack, const AString & iNeedle, const AString & iReplaceWith)
{
size_t pos1 = iHayStack.find(iNeedle);
while (pos1 != AString::npos)
{
iHayStack.replace( pos1, iNeedle.size(), iReplaceWith);
pos1 = iHayStack.find(iNeedle, pos1);
}
}
AStringList GetDirectoryContents(const char * a_Directory)
{
AStringList AllFiles;
#ifdef _WIN32
AString FileFilter = AString(a_Directory) + "*.*";
HANDLE hFind;
WIN32_FIND_DATA FindFileData;
if ((hFind = FindFirstFile(FileFilter.c_str(), &FindFileData)) != INVALID_HANDLE_VALUE)
{
do
{
AllFiles.push_back(FindFileData.cFileName);
} while (FindNextFile(hFind, &FindFileData));
FindClose(hFind);
}
#else // _WIN32
DIR * dp;
struct dirent *dirp;
if (*a_Directory == 0)
{
a_Directory = ".";
}
if ((dp = opendir(a_Directory)) == NULL)
{
LOGERROR("Error (%i) opening directory \"%s\"\n", errno, a_Directory );
}
else
{
while ((dirp = readdir(dp)) != NULL)
{
AllFiles.push_back(dirp->d_name);
}
closedir(dp);
}
#endif // else _WIN32
return AllFiles;
}
// Converts a stream of BE shorts into UTF-8 string; returns a ref to a_UTF8
AString & RawBEToUTF8(short * a_RawData, int a_NumShorts, AString & a_UTF8)
{
a_UTF8.clear();
a_UTF8.reserve(3 * a_NumShorts / 2); // a quick guess of the resulting size
for (int i = 0; i < a_NumShorts; i++)
{
int c = ntohs(*(a_RawData + i));
if (c < 0x80)
{
a_UTF8.push_back((char)c);
}
else if (c < 0x800)
{
a_UTF8.push_back((char)(192 + c / 64));
a_UTF8.push_back((char)(128 + c % 64));
}
else if (c - 0xd800u < 0x800)
{
// Error, silently drop
}
else if (c < 0x10000)
{
a_UTF8.push_back((char)(224 + c / 4096));
a_UTF8.push_back((char)(128 + c / 64 % 64));
a_UTF8.push_back((char)(128 + c % 64));
}
else if (c < 0x110000)
{
a_UTF8.push_back((char)(240 + c / 262144));
a_UTF8.push_back((char)(128 + c / 4096 % 64));
a_UTF8.push_back((char)(128 + c / 64 % 64));
a_UTF8.push_back((char)(128 + c % 64));
}
else
{
// Error, silently drop
}
}
return a_UTF8;
}
// UTF-8 conversion code adapted from:
// http://stackoverflow.com/questions/2867123/convert-utf-16-to-utf-8-under-windows-and-linux-in-c
#define UNI_MAX_BMP 0x0000FFFF
#define UNI_MAX_UTF16 0x0010FFFF
#define UNI_MAX_UTF32 0x7FFFFFFF
#define UNI_MAX_LEGAL_UTF32 0x0010FFFF
#define UNI_SUR_HIGH_START 0xD800
#define UNI_SUR_HIGH_END 0xDBFF
#define UNI_SUR_LOW_START 0xDC00
#define UNI_SUR_LOW_END 0xDFFF
static const char trailingBytesForUTF8[256] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5
};
static const unsigned int offsetsFromUTF8[6] =
{
0x00000000UL, 0x00003080UL, 0x000E2080UL,
0x03C82080UL, 0xFA082080UL, 0x82082080UL
};
static bool isLegalUTF8(const unsigned char * source, int length)
{
unsigned char a;
const unsigned char * srcptr = source + length;
switch (length)
{
default: return false;
// Everything else falls through when "true"...
case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
case 2:
{
if ((a = (*--srcptr)) > 0xBF) return false;
switch (*source)
{
// no fall-through in this inner switch
case 0xE0: if (a < 0xA0) return false; break;
case 0xED: if (a > 0x9F) return false; break;
case 0xF0: if (a < 0x90) return false; break;
case 0xF4: if (a > 0x8F) return false; break;
default: if (a < 0x80) return false;
}
}
case 1: if (*source >= 0x80 && *source < 0xC2) return false;
}
if (*source > 0xF4) return false;
return true;
}
AString & UTF8ToRawBEUTF16(const char * a_UTF8, size_t a_UTF8Length, AString & a_UTF16)
{
a_UTF16.clear();
a_UTF16.reserve(a_UTF8Length * 3);
const unsigned char * source = (const unsigned char*)a_UTF8;
const unsigned char * sourceEnd = source + a_UTF8Length;
const int halfShift = 10; // used for shifting by 10 bits
const unsigned int halfBase = 0x0010000UL;
const unsigned int halfMask = 0x3FFUL;
while (source < sourceEnd)
{
unsigned int ch = 0;
unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
if (source + extraBytesToRead >= sourceEnd)
{
return a_UTF16;
}
// Do this check whether lenient or strict
if (!isLegalUTF8(source, extraBytesToRead + 1))
{
return a_UTF16;
break;
}
// The cases all fall through. See "Note A" below.
switch (extraBytesToRead)
{
case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
case 3: ch += *source++; ch <<= 6;
case 2: ch += *source++; ch <<= 6;
case 1: ch += *source++; ch <<= 6;
case 0: ch += *source++;
}
ch -= offsetsFromUTF8[extraBytesToRead];
if (ch <= UNI_MAX_BMP)
{
// Target is a character <= 0xFFFF
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END)
{
// UTF-16 surrogate values are illegal in UTF-32
ch = ' ';
}
unsigned short v = htons((unsigned short)ch);
a_UTF16.append((const char *)&v, 2);
}
else if (ch > UNI_MAX_UTF16)
{
// Invalid value, replace with a space
unsigned short v = htons(' ');
a_UTF16.append((const char *)&v, 2);
}
else
{
// target is a character in range 0xFFFF - 0x10FFFF.
ch -= halfBase;
unsigned short v1 = htons((ch >> halfShift) + UNI_SUR_HIGH_START);
unsigned short v2 = htons((ch & halfMask) + UNI_SUR_LOW_START);
a_UTF16.append((const char *)&v1, 2);
a_UTF16.append((const char *)&v2, 2);
}
}
return a_UTF16;
}
/* ---------------------------------------------------------------------
Note A.
The fall-through switches in UTF-8 reading code save a
temp variable, some decrements & conditionals. The switches
are equivalent to the following loop:
{
int tmpBytesToRead = extraBytesToRead+1;
do {
ch += *source++;
--tmpBytesToRead;
if (tmpBytesToRead) ch <<= 6;
} while (tmpBytesToRead > 0);
}
--------------------------------------------------------------------- */
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