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cuberite-2a/src/StringUtils.cpp
Alexander Harkness c3cd436ec3 Merge remote-tracking branch 'origin/master' into foldermove2 
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2013-11-24 14:37:03 +00:00

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// StringUtils.cpp
// Implements the various string helper functions:
#include "Globals.h"
#if defined(ANDROID_NDK)
#include <ctype.h>
#endif
#ifdef _MSC_VER
// Under MSVC, link to WinSock2 (needed by RawBEToUTF8's byteswapping)
#pragma comment(lib, "ws2_32.lib")
#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 Printf(const char * format, ...)
{
AString res;
va_list args;
va_start(args, format);
AppendVPrintf(res, format, args);
va_end(args);
return res;
}
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 + 1;
}
if (Prev < str.length())
{
results.push_back(str.substr(Prev));
}
return results;
}
AStringVector StringSplitAndTrim(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(TrimString(str.substr(Prev, cutAt - Prev)));
Prev = cutAt + 1;
}
if (Prev < str.length())
{
results.push_back(TrimString(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;
}
AString & StrToLower(AString & s)
{
AString::iterator i = s.begin();
AString::iterator end = s.end();
while (i != end)
{
*i = (char)tolower(*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);
}
}
// 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
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Begin of Unicode, Inc.'s code / information
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*
Notice from the original file:
* Copyright 2001-2004 Unicode, Inc.
*
* Disclaimer
*
* This source code is provided as is by Unicode, Inc. No claims are
* made as to fitness for any particular purpose. No warranties of any
* kind are expressed or implied. The recipient agrees to determine
* applicability of information provided. If this file has been
* purchased on magnetic or optical media from Unicode, Inc., the
* sole remedy for any claim will be exchange of defective media
* within 90 days of receipt.
*
* Limitations on Rights to Redistribute This Code
*
* Unicode, Inc. hereby grants the right to freely use the information
* supplied in this file in the creation of products supporting the
* Unicode Standard, and to make copies of this file in any form
* for internal or external distribution as long as this notice
* remains attached.
*/
#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);
}
---------------------------------------------------------------------
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// End of Unicode, Inc.'s code / information
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#define HEX(x) ((x) > 9 ? (x) + 'A' - 10 : (x) + '0')
/**
format binary data this way:
00001234: 31 32 33 34 35 36 37 38 39 30 61 62 63 64 65 66 1234567890abcdef
*/
AString & CreateHexDump(AString & a_Out, const void * a_Data, int a_Size, int a_LineLength)
{
ASSERT(a_LineLength <= 120); // Due to using a fixed size line buffer; increase line[]'s size to lift this max
char line[512];
char * p;
char * q;
a_Out.reserve(a_Size / a_LineLength * (18 + 6 * a_LineLength));
for (int i = 0; i < a_Size; i += a_LineLength)
{
int k = a_Size - i;
if (k > a_LineLength)
{
k = a_LineLength;
}
#ifdef _MSC_VER
// MSVC provides a "secure" version of sprintf()
int Count = sprintf_s(line, sizeof(line), "%08x:", i);
#else
int Count = sprintf(line, "%08x:", i);
#endif
// Remove the terminating NULL / leftover garbage in line, after the sprintf-ed value
memset(line + Count, 32, sizeof(line) - Count);
p = line + 10;
q = p + 2 + a_LineLength * 3 + 1;
for (int j = 0; j < k; j++)
{
unsigned char c = ((unsigned char *)a_Data)[i + j];
p[0] = HEX(c >> 4);
p[1] = HEX(c & 0xf);
p[2] = ' ';
if (c >= ' ')
{
q[0] = (char)c;
}
else
{
q[0] = '.';
}
p += 3;
q ++;
} // for j
q[0] = '\n';
q[1] = 0;
a_Out.append(line);
} // for i
return a_Out;
}
AString EscapeString(const AString & a_Message)
{
AString EscapedMsg;
size_t len = a_Message.size();
size_t last = 0;
EscapedMsg.reserve(len);
for (size_t i = 0; i < len; i++)
{
char ch = a_Message[i];
switch (ch)
{
case '\'':
case '\"':
case '\\':
{
if (i > last)
{
EscapedMsg.append(a_Message, last, i - last);
}
EscapedMsg.push_back('\\');
EscapedMsg.push_back(ch);
last = i + 1;
break;
}
} // switch (ch)
} // for i - a_Message[]
if (len > last)
{
EscapedMsg.append(a_Message, last, len - last);
}
return EscapedMsg;
}
AString StripColorCodes(const AString & a_Message)
{
AString res(a_Message);
size_t idx = 0;
while (true)
{
idx = res.find("\xc2\xa7", idx);
if (idx == AString::npos)
{
return res;
}
res.erase(idx, 3);
}
}
AString URLDecode(const AString & a_String)
{
AString res;
size_t len = a_String.length();
res.reserve(len);
for (size_t i = 0; i < len; i++)
{
char ch = a_String[i];
if ((ch != '%') || (i > len - 3))
{
res.push_back(ch);
continue;
}
// Decode the hex value:
char hi = a_String[i + 1], lo = a_String[i + 2];
if ((hi >= '0') && (hi <= '9'))
{
hi = hi - '0';
}
else if ((hi >= 'a') && (hi <= 'f'))
{
hi = hi - 'a' + 10;
}
else if ((hi >= 'A') && (hi <= 'F'))
{
hi = hi - 'F' + 10;
}
else
{
res.push_back(ch);
continue;
}
if ((lo >= '0') && (lo <= '9'))
{
lo = lo - '0';
}
else if ((lo >= 'a') && (lo <= 'f'))
{
lo = lo - 'a' + 10;
}
else if ((lo >= 'A') && (lo <= 'F'))
{
lo = lo - 'A' + 10;
}
else
{
res.push_back(ch);
continue;
}
res.push_back((hi << 4) | lo);
i += 2;
} // for i - a_String[]
return res;
}
AString ReplaceAllCharOccurrences(const AString & a_String, char a_From, char a_To)
{
AString res(a_String);
std::replace(res.begin(), res.end(), a_From, a_To);
return res;
}
/// Converts one Hex character in a Base64 encoding into the data value
static inline int UnBase64(char c)
{
if (c >='A' && c <= 'Z')
{
return c - 'A';
}
if (c >='a' && c <= 'z')
{
return c - 'a' + 26;
}
if (c >= '0' && c <= '9')
{
return c - '0' + 52;
}
if (c == '+')
{
return 62;
}
if (c == '/')
{
return 63;
}
if (c == '=')
{
return -1;
}
return -2;
}
AString Base64Decode(const AString & a_Base64String)
{
AString res;
size_t i, len = a_Base64String.size();
int o, c;
res.resize((len * 4) / 3 + 5, 0); // Approximate the upper bound on the result length
for (o = 0, i = 0; i < len; i++)
{
c = UnBase64(a_Base64String[i]);
if (c >= 0)
{
switch (o & 7)
{
case 0: res[o >> 3] |= (c << 2); break;
case 6: res[o >> 3] |= (c >> 4); res[(o >> 3) + 1] |= (c << 4); break;
case 4: res[o >> 3] |= (c >> 2); res[(o >> 3) + 1] |= (c << 6); break;
case 2: res[o >> 3] |= c; break;
}
o += 6;
}
if (c == -1)
{
// Error while decoding, invalid input. Return as much as we've decoded:
res.resize(o >> 3);
return res;
}
}
res.resize(o >> 3);
return res;}
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