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// **********************************************************************
//
// Copyright (c) 2003-2005 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <Ice/Config.h>
#include <Ice/StringUtil.h>
using namespace std;
static string
toOctalString(unsigned int n)
{
string s;
s.resize(32);
string::size_type charPos = 32;
const int radix = 1 << 3;
int mask = radix - 1;
do
{
s[--charPos] = '0' + (n & mask);
n >>= 3;
}
while(n != 0);
return string(s, charPos, (32 - charPos));
}
static void
encodeChar(string::value_type b, string& s, const string& special)
{
switch(b)
{
case '\\':
{
s.append("\\\\");
break;
}
case '\'':
{
s.append("\\'");
break;
}
case '"':
{
s.append("\\\"");
break;
}
case '\b':
{
s.append("\\b");
break;
}
case '\f':
{
s.append("\\f");
break;
}
case '\n':
{
s.append("\\n");
break;
}
case '\r':
{
s.append("\\r");
break;
}
case '\t':
{
s.append("\\t");
break;
}
default:
{
if(static_cast<signed char>(b) <= 31 || b == 127)
{
s.push_back('\\');
string octal = toOctalString(b);
//
// Add leading zeroes so that we avoid problems during
// decoding. For example, consider the encoded string
// \0013 (i.e., a character with value 1 followed by
// the character '3'). If the leading zeroes were omitted,
// the result would be incorrectly interpreted by the
// decoder as a single character with value 11.
//
for(string::size_type j = octal.size(); j < 3; j++)
{
s.push_back('0');
}
s.append(octal);
}
else if(special.find(b) != string::npos)
{
s.push_back('\\');
encodeChar(b, s, "");
}
else
{
s.push_back(b);
}
}
}
}
//
// Encodes a string into UTF8, escaping all characters outside the range [32-126]
// as well as any special characters determined by the caller.
//
string
IceInternal::encodeString(const string& s, const string& special)
{
string result;
result.reserve(s.size());
for(string::size_type i = 0; i < s.size(); i++)
{
encodeChar(s[i], result, special);
}
return result;
}
//
// Decodes a UTF8 string. Decoding starts at the given start position
// (inclusive) and stops at the given end position (exclusive). Upon success,
// the result parameter holds the decoded string and true is returned.
// A return value of false indicates an error was detected in the encoding.
//
bool
IceInternal::decodeString(const string& s, string::size_type start, string::size_type end, string& result)
{
assert(end <= s.size());
assert(start <= end);
while(start < end)
{
char ch = s[start];
if(ch == '\\')
{
start++;
if(start == end)
{
return false; // Missing character.
}
ch = s[start];
switch(ch)
{
case '\\':
{
result.push_back('\\');
break;
}
case '\'':
case '"':
{
result.push_back(ch);
break;
}
case 'b':
{
result.push_back('\b');
break;
}
case 'f':
{
result.push_back('\f');
break;
}
case 'n':
{
result.push_back('\n');
break;
}
case 'r':
{
result.push_back('\r');
break;
}
case 't':
{
result.push_back('\t');
break;
}
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
int count = 0;
int val = 0;
while(count < 3 && start < end && s[start] >= '0' && s[start] <= '9')
{
val <<= 3;
val |= s[start] - '0';
start++;
count++;
}
if(val > 255)
{
return false; // Octal value out of range.
}
result.push_back((string::value_type)val);
continue; // Don't increment start.
}
default:
{
if(static_cast<signed char>(ch) <= 31 || ch == 127)
{
return false; // Malformed encoding.
}
else
{
result.push_back(ch);
}
}
}
}
else
{
result.push_back(ch);
}
start++;
}
return true;
}
//
// If a single or double quotation mark is found at the start position,
// then the position of the matching closing quote is returned. If no
// quotation mark is found at the start position, then 0 is returned.
// If no matching closing quote is found, then -1 is returned.
//
string::size_type
IceInternal::checkQuote(const string& s, string::size_type start)
{
string::value_type quoteChar = s[start];
if(quoteChar == '"' || quoteChar == '\'')
{
start++;
string::size_type pos;
while(start < s.size() && (pos = s.find(quoteChar, start)) != string::npos)
{
if(s[pos - 1] != '\\')
{
return pos;
}
start = pos + 1;
}
return string::npos; // Unmatched quote.
}
return 0; // Not quoted.
}
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