/// <summary>
/// Adds slashes before characters '\\', '\0', '\'' and '"'.
/// </summary>
/// <param name="str">The string to add slashes in.</param>
/// <param name="doubleQuotes">Whether to slash double quotes.</param>
/// <param name="singleQuotes">Whether to slash single quotes.</param>
/// <param name="nul">Whether to slash '\0' character.</param>
/// <returns>The slashed string.</returns>
/// <exception cref="ArgumentNullException"><paramref name="str"/> is a <B>null</B> reference.</exception>
public static string /*!*/ AddCSlashes(string /*!*/ str, bool singleQuotes = true, bool doubleQuotes = true, bool nul = true)
{
if (str == null)
{
throw new ArgumentNullException(nameof(str));
}
var result = StringBuilderUtilities.Pool.Get();
string double_quotes = doubleQuotes ? "\\\"" : "\"";
string single_quotes = singleQuotes ? @"\'" : "'";
string slashed_nul = nul ? "\\0" : "\0";
for (int i = 0; i < str.Length; i++)
{
char c = str[i];
switch (c)
{
case '\\': result.Append(@"\\"); break;
case '\0': result.Append(slashed_nul); break;
case '\'': result.Append(single_quotes); break;
case '"': result.Append(double_quotes); break;
default: result.Append(c); break;
}
}
return(StringBuilderUtilities.GetStringAndReturn(result));
}
private static string /*!*/ Unescape(string /*!*/ path, int start)
{
var unescaped = StringBuilderUtilities.Pool.Get();
var inEscape = false;
for (int i = start; i < path.Length; i++)
{
var c = path[i];
if (inEscape)
{
inEscape = false;
}
else if (c == '\\')
{
inEscape = true;
continue;
}
unescaped.Append(c);
}
if (inEscape)
{
unescaped.Append('\\');
}
//
return(StringBuilderUtilities.GetStringAndReturn(unescaped));
}
public static string Serialize(Context ctx, PhpValue variable, JsonEncodeOptions encodeOptions, RuntimeTypeHandle caller)
{
var str = StringBuilderUtilities.Pool.Get();
variable.Accept(new ObjectWriter(ctx, str, encodeOptions, caller));
return(StringBuilderUtilities.GetStringAndReturn(str)); // note: str is cleared
}
public bool Parse(string input, bool isFinal)
{
// the problem is when isFinal == false
// XmlReader (more precisely XmlTextReaderImpl) synchronously waits for data from underlying stream when Read is called
// and there is no way to tell whether we have sufficient amount of data for the next Read call
// and if underlying stream ends prematurely, reader will get into Error state (so these simple workarounds are not possible)
// current solution caches the data until isFinal == true and then performs the parsing
// this is not memory efficient (usually this method gets called in a cycle on small chunks to save memory)
// other way would be to let the reader wait on another thread (in thread pool), which would not be that bad
// since XmlParser gets freed eventually
// theoretically the best way would be to implement XmlReader, that would be able to recognize whether there is enough
// data, but we have not further analyzed this possibility since it seems to result in unappropriate amount of work
// yet another possible way is to use parser for inner element, and let it come into error state (not tested or thought through)
// this does not work since inner parser can only be created when the parser reads an element (not in the beginning)
if (isFinal)
{
input ??= string.Empty;
var sb = StringBuilderUtilities.Pool.Get();
if (_inputQueue != null)
{
foreach (string s in _inputQueue)
{
sb.Append(s);
}
_inputQueue = null;
}
sb.Append(input);
return(ParseInternal(StringBuilderUtilities.GetStringAndReturn(sb), null, null));
}
else
{
//just reset these values - we are still in the beginning
CurrentLineNumber = 0;
CurrentColumnNumber = 0;
if (!string.IsNullOrEmpty(input))
{
if (_inputQueue == null)
{
_inputQueue = new Queue <string>();
}
_inputQueue.Enqueue(input);
}
return(true);
}
}
static string ToString(Rational num, int scale)
{
var numerator = BigInteger.Abs(num.Numerator);
var denominator = BigInteger.Abs(num.Denominator);
var hasdecimal = false;
var result = StringBuilderUtilities.Pool.Get();
if (num.Sign < 0)
{
result.Append('-');
}
for (; ;)
{
var number = BigInteger.DivRem(numerator, denominator, out var rem);
if (number >= 10)
{
var digits = number.ToString(NumberFormatInfo.InvariantInfo);
result.Append(digits);
}
else
{
Debug.Assert(number >= 0);
result.Append((char)('0' + (int)number));
}
if (scale <= 0)
{
break;
}
// .
if (!hasdecimal)
{
hasdecimal = true;
result.Append(NumberFormatInfo.InvariantInfo.NumberDecimalSeparator);
}
// done?
if (rem.IsZero)
{
result.Append('0', scale);
break;
}
// next decimals
numerator = rem * 10;
scale--;
}
//
return(StringBuilderUtilities.GetStringAndReturn(result));
}
/// <summary>
/// Gets stack trace as string.
/// </summary>
public static string GetStackTraceString(this PhpStackTrace trace, int skip = 0)
{
var result = StringBuilderUtilities.Pool.Get();
var lines = trace.GetLines();
for (int i = 1 + skip, order = 0; i < lines.Length; i++, order++)
{
lines[i].GetStackTraceLine(order, result);
result.AppendLine();
}
return(StringBuilderUtilities.GetStringAndReturn(result));
}
/// <summary>
/// Strips slashes from a string.
/// </summary>
/// <param name="str">String.</param>
/// <returns>
/// String where slashes are striped away.
/// Slashed characters with special meaning ("\0") are replaced with their special value.
/// </returns>
public static string /*!*/ StripCSlashes(string /*!*/ str)
{
if (str == null)
{
throw new ArgumentNullException(nameof(str));
}
if (str.Length == 0)
{
return(string.Empty);
}
var result = StringBuilderUtilities.Pool.Get();
int from = 0; // plain chunk start
for (int i = 0; i < str.Length; i++)
{
if (str[i] == '\\')
{
//
result.Append(str, from, i - from);
//
if (++i < str.Length)
{
// PHP strips all slashes, not only quotes and slash
// "\0" has a special meaning => '\0'
var slashed = str[i];
result.Append(slashed == '0' ? '\0' : slashed);
}
from = i + 1;
}
}
//
if (from < str.Length)
{
result.Append(str, from, str.Length - from);
}
//
return(StringBuilderUtilities.GetStringAndReturn(result));
}
/// <summary>
/// Quote regular expression characters.
/// </summary>
/// <remarks>
/// The special regular expression characters are: . \ + * ? [ ^ ] $ ( ) { } = ! < > | : -
/// Note that / is not a special regular expression character.
/// </remarks>
/// <param name="str">The string to be escaped.</param>
/// <param name="delimiter">If the optional delimiter is specified, it will also be escaped.
/// This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter.</param>
public static string preg_quote(string str, string delimiter = null)
{
if (string.IsNullOrEmpty(str))
{
return(str);
}
char delimiterChar = string.IsNullOrEmpty(delimiter)
? char.MaxValue // unused (?)
: delimiter[0];
StringBuilder result = null;
int lastEscape = 0;
for (int i = 0; i < str.Length; i++)
{
char ch = str[i];
bool escape = ch == delimiterChar || IsDelimiterChar(ch);
if (escape)
{
if (result == null)
{
result = StringBuilderUtilities.Pool.Get();
}
result.Append(str, lastEscape, i - lastEscape);
result.Append('\\');
lastEscape = i;
}
}
if (result != null)
{
result.Append(str, lastEscape, str.Length - lastEscape);
return(StringBuilderUtilities.GetStringAndReturn(result));
}
else
{
return(str);
}
}
/// <summary>
/// Gets exception string.
/// </summary>
public static string FormatExceptionString(this PhpStackTrace trace, string exceptionname, string message)
{
var result = StringBuilderUtilities.Pool.Get();
// TODO: texts to resources
// {exceptionname} in {location}
// Stack trace:
// #0 ...
var lines = trace.GetLines();
result.Append(exceptionname);
if (!string.IsNullOrEmpty(message))
{
result.Append(": ");
result.Append(message);
}
if (lines.Length != 0)
{
if (lines[0].HasLocation)
{
result.Append(" in ");
lines[0].GetStackTraceLine(-1, result);
}
if (lines.Length > 1)
{
result.AppendLine();
result.AppendLine("Stack trace:");
for (int i = 1; i < lines.Length; i++)
{
lines[i].GetStackTraceLine(i - 1, result);
result.AppendLine();
}
}
}
//
return(StringBuilderUtilities.GetStringAndReturn(result));
}
/// <summary>
/// Replaces slashed 0 with null character ('\0') and double apostrophe with single apostrophe.
/// </summary>
/// <param name="str">String.</param>
/// <returns>String with replaced characters.</returns>
public static string /*!*/ StripDbSlashes(string /*!*/ str)
{
if (str == null)
{
throw new ArgumentNullException(nameof(str));
}
var result = StringBuilderUtilities.Pool.Get();
int i = 0;
while (i < str.Length - 1)
{
if (str[i] == '\\' && str[i + 1] == '0')
{
result.Append('\0');
i += 2;
}
else if (str[i] == '\'' && str[i + 1] == '\'')
{
result.Append('\'');
i += 2;
}
else
{
result.Append(str[i]);
i++;
}
}
if (i < str.Length)
{
result.Append(str[i]);
}
return(StringBuilderUtilities.GetStringAndReturn(result));
}
/// <summary>
/// Adds slash before '\0' character and duplicates apostrophes.
/// </summary>
/// <param name="str">The string to add slashes in.</param>
/// <returns>The slashed string.</returns>
/// <exception cref="ArgumentNullException"><paramref name="str"/> is a <B>null</B> reference.</exception>
public static string /*!*/ AddDbSlashes(string /*!*/ str)
{
if (str == null)
{
throw new ArgumentNullException(nameof(str));
}
StringBuilder result = StringBuilderUtilities.Pool.Get();
for (int i = 0; i < str.Length; i++)
{
char c = str[i];
switch (c)
{
case '\0': result.Append('\\'); result.Append('0'); break;
case '\'': result.Append('\''); result.Append('\''); break;
default: result.Append(c); break;
}
}
return(StringBuilderUtilities.GetStringAndReturn(result));
}
private static string DoubleToBase(double number, int toBase)
{
if (toBase < 2 || toBase > 36)
{
PhpException.InvalidArgument(nameof(toBase), Resources.LibResources.arg_out_of_bounds);
return(null); // FALSE
}
// Don't try to convert infinity or NaN:
if (double.IsInfinity(number) || double.IsNaN(number))
{
PhpException.InvalidArgument(nameof(number), Resources.LibResources.arg_out_of_bounds);
return(null); // FALSE
}
double fvalue = Math.Floor(number); /* floor it just in case */
if (Math.Abs(fvalue) < 1)
{
return("0");
}
var sb = StringBuilderUtilities.Pool.Get();
while (Math.Abs(fvalue) >= 1)
{
double mod = fmod(fvalue, toBase);
int i = (int)mod;
char c = digitsUnicode[i];
//sb.Append(digits[(int) fmod(fvalue, toBase)]);
sb.Append(c);
fvalue /= toBase;
}
return(Core.Utilities.StringUtils.Reverse(StringBuilderUtilities.GetStringAndReturn(sb)));
}
/// <summary>
/// Unpacks data from a string of bytes into <see cref="PhpArray"/>.
/// </summary>
/// <param name="ctx">Runtime context.</param>
/// <param name="format">The string defining the items of the result. See PHP manual for details.</param>
/// <param name="data">The string of bytes to be unpacked.</param>
/// <returns>The <see cref="PhpArray"/> containing unpacked data.</returns>
public static PhpArray unpack(Context ctx, string format, PhpString data)
{
if (format == null)
{
return(null);
}
byte[] buffer = data.ToBytes(ctx);
var encoding = ctx.StringEncoding;
byte[] reversed = new byte[4]; // used for reversing the order of bytes in buffer
int i = 0;
int pos = 0;
PhpArray result = new PhpArray();
while (i < format.Length)
{
string name;
int repeater;
char specifier;
// parses specifier, repeater, and name from the format string:
ParseFormatToken(format, ref i, out specifier, out repeater, out name);
int remains = buffer.Length - pos; // the number of bytes remaining in the buffer
int size; // a size of data to be extracted corresponding to the specifier
// repeater of '@' specifier has a special meaning:
if (specifier == '@')
{
if (repeater > buffer.Length || repeater == InfiniteRepeater)
{
PhpException.Throw(PhpError.Warning, LibResources.GetString("outside_string", specifier));
}
else
{
pos = repeater;
}
continue;
}
// number of operations:
int op_count;
// gets the size of the data to read and adjust repeater:
if (!GetSizeToUnpack(specifier, remains, repeater, out op_count, out size))
{
PhpException.Throw(PhpError.Warning, LibResources.GetString("unknown_format_code", specifier));
return(null);
}
// repeats operation determined by specifier "op_count" times;
// if op_count is infinite then stops when the number of remaining characters is zero:
for (int j = 0; j < op_count || op_count == InfiniteRepeater; j++)
{
if (size > remains)
{
// infinite means "while data are available":
if (op_count == InfiniteRepeater)
{
break;
}
PhpException.Throw(PhpError.Warning, LibResources.GetString("not_enought_input", specifier, size, remains));
return(null);
}
PhpValue item;
switch (specifier)
{
case 'X': // decreases position, no value stored:
if (pos == 0)
{
PhpException.Throw(PhpError.Warning, LibResources.GetString("outside_string", specifier));
}
else
{
pos--;
}
continue;
case 'x': // advances position, no value stored
pos++;
continue;
case 'a': // NUL-padded string
case 'A': // SPACE-padded string
{
byte pad = (byte)(specifier == 'a' ? 0x00 : 0x20);
int last = pos + size - 1;
while (last >= pos && buffer[last] == pad)
{
last--;
}
item = (PhpValue)encoding.GetString(buffer, pos, last - pos + 1);
break;
}
case 'h': // Hex string, low/high nibble first - converts to a string, takes n hex digits from string:
case 'H':
{
int p = pos;
int nibble_shift = (specifier == 'h') ? 0 : 4;
var sb = StringBuilderUtilities.Pool.Get();
for (int k = 0; k < size; k++)
{
const string hex_digits = "0123456789ABCDEF";
sb.Append(hex_digits[(buffer[p] >> nibble_shift) & 0x0f]);
// beware of odd repeaters!
if (repeater == InfiniteRepeater || repeater > sb.Length)
{
sb.Append(hex_digits[(buffer[p] >> (4 - nibble_shift)) & 0x0f]);
}
p++;
}
item = StringBuilderUtilities.GetStringAndReturn(sb);
break;
}
case 'c': // signed char
item = (PhpValue)(int)unchecked ((sbyte)buffer[pos]);
break;
case 'C': // unsigned char
item = (PhpValue)(int)buffer[pos];
break;
case 's': // signed short (always 16 bit, machine byte order)
item = (PhpValue)(int)BitConverter.ToInt16(buffer, pos);
break;
case 'S': // unsigned short (always 16 bit, machine byte order)
item = (PhpValue)(int)BitConverter.ToUInt16(buffer, pos);
break;
case 'n': // unsigned short (always 16 bit, big endian byte order)
if (BitConverter.IsLittleEndian)
{
item = (PhpValue)(int)BitConverter.ToUInt16(LoadReverseBuffer(reversed, buffer, pos, 2), 0);
}
else
{
item = (PhpValue)(int)BitConverter.ToUInt16(buffer, pos);
}
break;
case 'v': // unsigned short (always 16 bit, little endian byte order)
if (!BitConverter.IsLittleEndian)
{
item = (PhpValue)(int)BitConverter.ToUInt16(LoadReverseBuffer(reversed, buffer, pos, 2), 0);
}
else
{
item = (PhpValue)(int)BitConverter.ToUInt16(buffer, pos);
}
break;
case 'i': // signed integer (machine dependent size and byte order - always 32 bit)
case 'I': // unsigned integer (machine dependent size and byte order - always 32 bit)
case 'l': // signed long (always 32 bit, machine byte order)
case 'L': // unsigned long (always 32 bit, machine byte order)
item = (PhpValue)BitConverter.ToInt32(buffer, pos);
break;
case 'N': // unsigned long (always 32 bit, big endian byte order)
item = (PhpValue) unchecked (((int)buffer[pos] << 24) + (buffer[pos + 1] << 16) + (buffer[pos + 2] << 8) + buffer[pos + 3]);
break;
case 'V': // unsigned long (always 32 bit, little endian byte order)
item = (PhpValue) unchecked (((int)buffer[pos + 3] << 24) + (buffer[pos + 2] << 16) + (buffer[pos + 1] << 8) + buffer[pos + 0]);
break;
case 'f': // float (machine dependent size and representation - size is always 4B)
item = (PhpValue)(double)BitConverter.ToSingle(buffer, pos);
break;
case 'd': // double (machine dependent size and representation - size is always 8B)
item = (PhpValue)BitConverter.ToDouble(buffer, pos);
break;
default:
Debug.Fail("Invalid specifier.");
return(null);
}
AddValue(result, name, item, op_count, j);
pos += size;
remains -= size;
}
}
return(result);
}
public static int ShellExec(Context ctx, string command, OutputHandling handling, PhpArray?arrayOutput, out string?stringOutput)
{
if (!MakeCommandSafe(ref command))
{
stringOutput = null;
return(-1);
}
using (var p = new Process())
{
//IdentitySection identityConfig = null;
//try { identityConfig = WebConfigurationManager.GetSection("system.web/identity") as IdentitySection; }
//catch { }
//if (identityConfig != null)
//{
// p.StartInfo.UserName = identityConfig.UserName;
// if (identityConfig.Password != null)
// {
// p.StartInfo.Password = new SecureString();
// foreach (char c in identityConfig.Password) p.StartInfo.Password.AppendChar(c);
// p.StartInfo.Password.MakeReadOnly();
// }
//}
// prepare arguments
{
var arguments = StringBuilderUtilities.Pool.Get();
if (CurrentPlatform.IsWindows)
{
p.StartInfo.FileName = "cmd.exe";
AppendArgument(arguments, "/c");
}
else
{
p.StartInfo.FileName = "/bin/bash";
AppendArgument(arguments, "-c");
}
AppendArgument(arguments, command);
p.StartInfo.Arguments = StringBuilderUtilities.GetStringAndReturn(arguments);
}
p.StartInfo.UseShellExecute = false;
p.StartInfo.CreateNoWindow = true;
p.StartInfo.RedirectStandardOutput = true;
p.Start();
stringOutput = null;
switch (handling)
{
case OutputHandling.String:
stringOutput = p.StandardOutput.ReadToEnd();
break;
case OutputHandling.ArrayOfLines:
{
string line;
while ((line = p.StandardOutput.ReadLine()) != null)
{
arrayOutput?.Add(line);
stringOutput = line;
}
break;
}
case OutputHandling.FlushLinesToScriptOutput:
{
string line;
while ((line = p.StandardOutput.ReadLine()) != null)
{
stringOutput = line;
ctx.Output.WriteLine(line);
ctx.Output.Flush();
}
break;
}
case OutputHandling.RedirectToScriptOutput:
p.StandardOutput.BaseStream
.CopyToAsync(ctx.OutputStream)
.GetAwaiter()
.GetResult();
break;
}
p.WaitForExit();
//
return(p.ExitCode);
}
}
/// <summary>
/// Accumulates all characters contained or not contained in the set to the string in ascending order.
/// </summary>
/// <param name="first">The lower bound.</param>
/// <param name="last">The upper bound.</param>
/// <param name="complement">Whether to return characters not contained in the string.</param>
/// <returns>
/// Depending on the value of the <paramref name="complement"/> the method returns the string of characters in
/// this instance and a complement of this instance, respectively, intersected with the
/// [<paramref name="first"/>; <paramref name="last"/>] interval.
/// </returns>
/// <exception cref="IndexOutOfRangeException"><paramref name="first"/> or <paramref name="last"/> are not mapped by this instance.</exception>
public string ToString(char first, char last, bool complement)
{
if (first > last)
{
//throw new ArgumentException(CoreResources.GetString("last_is_less_than_first"));
throw new NotImplementedException();
}
int modf = first & 0x1f;
int modl = last & 0x1f;
int f = first >> 5;
int l = last >> 5;
// an optimization:
if (l > lastDirty && !complement)
{
// sets upper bound to the last bit in the lastDirty block:
l = lastDirty;
modl = 31;
// the whole interval is beyond the last set bit:
if (f > l)
{
return(String.Empty);
}
}
// if complementary set is required, we xor each item of the "flags" array by the "invert_equality"
// and so invert the result of comparison with zero in the following if statement:
uint invert_inequality = (complement) ? 0xffffffffU : 0U;
uint flg;
char c = first;
var result = StringBuilderUtilities.Pool.Get();
if (f == l)
{
// the "first" and the "last" points to the same block:
flg = flags[f] ^ invert_inequality;
for (uint mask = (0x80000000U >> modf); mask > (0x80000000U >> modl); mask >>= 1)
{
if ((flg & mask) != 0)
{
result.Append(c);
}
c++;
}
}
else
{
// the first block:
flg = flags[f] ^ invert_inequality;
for (uint mask = 0x80000000U >> modf; mask != 0; mask >>= 1)
{
if ((flg & mask) != 0)
{
result.Append(c);
}
c++;
}
// middle blocks (if any):
for (int i = f + 1; i < l; i++)
{
flg = flags[i] ^ invert_inequality;
for (uint mask = 0x80000000U; mask != 0; mask >>= 1)
{
if ((flg & mask) != 0)
{
result.Append(c);
}
c++;
}
}
// the last block:
flg = flags[l] ^ invert_inequality;
for (uint mask = 0x80000000U; mask >= (0x80000000U >> modl); mask >>= 1)
{
if ((flg & mask) != 0)
{
result.Append(c);
}
c++;
}
}
//
return(StringBuilderUtilities.GetStringAndReturn(result));
}
