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cuberite-2a/src/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
#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 != nullptr);
char buffer[2048];
size_t len;
#ifdef va_copy
va_list argsCopy;
va_copy(argsCopy, args);
#else
#define argsCopy args
#endif
#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, argsCopy)) != -1)
#else // _MSC_VER
if ((len = vsnprintf(buffer, ARRAYCOUNT(buffer), format, argsCopy)) < ARRAYCOUNT(buffer))
#endif // else _MSC_VER
{
// The result did fit into the static buffer
#ifdef va_copy
va_end(argsCopy);
#endif
str.append(buffer, len);
return str;
}
#ifdef va_copy
va_end(argsCopy);
#endif
// The result did not fit into the static buffer, use a dynamic buffer:
#ifdef _MSC_VER
// for MS CRT, we need to calculate the result length
// MS doesn't have va_copy() and does nod need it at all
len = _vscprintf(format, args);
if (len == -1)
{
return str;
}
#endif // _MSC_VER
// Allocate a buffer and printf into it:
#ifdef va_copy
va_copy(argsCopy, args);
#endif
std::vector<char> Buffer(len + 1);
#ifdef _MSC_VER
vsprintf_s((char *)&(Buffer.front()), Buffer.size(), format, argsCopy);
#else // _MSC_VER
vsnprintf((char *)&(Buffer.front()), Buffer.size(), format, argsCopy);
#endif // else _MSC_VER
str.append(&(Buffer.front()), Buffer.size() - 1);
#ifdef va_copy
va_end(argsCopy);
#endif
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 & InPlaceLowercase(AString & s)
{
std::transform(s.begin(), s.end(), s.begin(), ::tolower);
return s;
}
AString & InPlaceUppercase(AString & s)
{
std::transform(s.begin(), s.end(), s.begin(), ::toupper);
return s;
}
AString StrToLower(const AString & s)
{
AString res(s);
std::transform(res.begin(), res.end(), res.begin(), ::tolower);
return res;
}
AString StrToUpper(const AString & s)
{
AString res(s);
std::transform(res.begin(), res.end(), res.begin(), ::toupper);
return res;
}
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 - convert both strings to lowercase:
return StrToLower(s1).compare(StrToLower(s2));
#endif // else _MSC_VER
}
size_t RateCompareString(const AString & s1, const AString & s2)
{
size_t MatchedLetters = 0;
size_t s1Length = s1.length();
if (s1Length > s2.length())
{
// Definitely not a match
return 0;
}
for (size_t 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(const char * a_RawData, size_t a_NumShorts, AString & a_UTF8)
{
a_UTF8.clear();
a_UTF8.reserve(3 * a_NumShorts / 2); // a quick guess of the resulting size
for (size_t i = 0; i < a_NumShorts; i++)
{
int c = GetBEShort(&a_RawData[i * 2]);
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_SUR_HIGH_START 0xD800
#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 UTF16;
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 UTF16;
}
// Do this check whether lenient or strict
if (!isLegalUTF8(source, extraBytesToRead + 1))
{
return UTF16;
}
// 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);
UTF16.append((const char *)&v, 2);
}
else if (ch > UNI_MAX_UTF16)
{
// Invalid value, replace with a space
unsigned short v = htons(' ');
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);
UTF16.append((const char *)&v1, 2);
UTF16.append((const char *)&v2, 2);
}
}
return 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, size_t a_Size, size_t a_BytesPerLine)
{
ASSERT(a_BytesPerLine <= 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_BytesPerLine * (18 + 6 * a_BytesPerLine));
for (size_t i = 0; i < a_Size; i += a_BytesPerLine)
{
size_t k = a_Size - i;
if (k > a_BytesPerLine)
{
k = a_BytesPerLine;
}
#ifdef _MSC_VER
// MSVC provides a "secure" version of sprintf()
int Count = sprintf_s(line, sizeof(line), "%08x:", (unsigned)i);
#else
int Count = sprintf(line, "%08x:", (unsigned)i);
#endif
// Remove the terminating nullptr / leftover garbage in line, after the sprintf-ed value
memset(line + Count, 32, sizeof(line) - Count);
p = line + 10;
q = p + 2 + a_BytesPerLine * 3 + 1;
for (size_t 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;
for (;;)
{
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;
}
AString Base64Encode(const AString & a_Input)
{
static const char BASE64[64] =
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
AString output;
output.resize(((a_Input.size() + 2) / 3) * 4);
size_t output_index = 0;
size_t size_full24 = (a_Input.size() / 3) * 3;
for (size_t i = 0; i < size_full24; i += 3)
{
output[output_index++] = BASE64[(unsigned char)a_Input[i] >> 2];
output[output_index++] = BASE64[((unsigned char)a_Input[i] << 4 | (unsigned char)a_Input[i + 1] >> 4) & 63];
output[output_index++] = BASE64[((unsigned char)a_Input[i + 1] << 2 | (unsigned char)a_Input[i + 2] >> 6) & 63];
output[output_index++] = BASE64[(unsigned char)a_Input[i + 2] & 63];
}
if (size_full24 < a_Input.size())
{
output[output_index++] = BASE64[(unsigned char)a_Input[size_full24] >> 2];
if (size_full24 + 1 == a_Input.size())
{
output[output_index++] = BASE64[((unsigned char)a_Input[size_full24] << 4) & 63];
output[output_index++] = '=';
}
else
{
output[output_index++] = BASE64[((unsigned char)a_Input[size_full24] << 4 | (unsigned char)a_Input[size_full24 + 1] >> 4) & 63];
output[output_index++] = BASE64[((unsigned char)a_Input[size_full24 + 1] << 2) & 63];
}
output[output_index++] = '=';
}
ASSERT(output_index == output.size());
return output;
}
short GetBEShort(const char * a_Mem)
{
const Byte * Bytes = (const Byte *)a_Mem;
return (Bytes[0] << 8) | Bytes[1];
}
int GetBEInt(const char * a_Mem)
{
const Byte * Bytes = (const Byte *)a_Mem;
return (Bytes[0] << 24) | (Bytes[1] << 16) | (Bytes[2] << 8) | Bytes[3];
}
void SetBEInt(char * a_Mem, Int32 a_Value)
{
a_Mem[0] = a_Value >> 24;
a_Mem[1] = (a_Value >> 16) & 0xff;
a_Mem[2] = (a_Value >> 8) & 0xff;
a_Mem[3] = a_Value & 0xff;
}
bool SplitZeroTerminatedStrings(const AString & a_Strings, AStringVector & a_Output)
{
a_Output.clear();
size_t size = a_Strings.size();
size_t start = 0;
bool res = false;
for (size_t i = 0; i < size; i++)
{
if (a_Strings[i] == 0)
{
a_Output.push_back(a_Strings.substr(start, i - start));
start = i + 1;
res = true;
}
}
if (start < size)
{
a_Output.push_back(a_Strings.substr(start, size - start));
res = true;
}
return res;
}
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