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#include <qpdf/QUtil.hh>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef _WIN32
#include <Windows.h>
#include <direct.h>
#else
#include <unistd.h>
#endif
std::string
QUtil::int_to_string(int num, int fullpad)
{
// This routine will need to be recompiled if an int can be longer than
// 49 digits.
char t[50];
// -2 or -1 to leave space for the possible negative sign and for NUL...
if (abs(fullpad) > (int)sizeof(t) - ((num < 0)?2:1))
{
throw QEXC::Internal("Util::int_to_string has been called with "
"a padding value greater than its internal "
"limit");
}
if (fullpad)
{
sprintf(t, "%0*d", fullpad, num);
}
else
{
sprintf(t, "%d", num);
}
return std::string(t);
}
std::string
QUtil::double_to_string(double num, int decimal_places)
{
// This routine will need to be recompiled if a double can be longer than
// 99 digits.
char t[100];
std::string lhs = int_to_string((int)num);
// lhs.length() gives us the length of the part on the right hand
// side of the dot + 1 for the dot + decimal_places: total size of
// the required string. -1 on the sizeof side to allow for NUL at
// the end.
//
// If decimal_places <= 0, it is as if no precision was provided
// so trust the buffer is big enough. The following test will
// always pass in those cases.
if (decimal_places + 1 + (int)lhs.length() > (int)sizeof(t) - 1)
{
throw QEXC::Internal("Util::double_to_string has been called with "
"a number and a decimal places specification "
"that would break an internal limit");
}
if (decimal_places)
{
sprintf(t, "%.*f", decimal_places, num);
}
else
{
sprintf(t, "%f", num);
}
return std::string(t);
}
int
QUtil::os_wrapper(std::string const& description, int status) throw (QEXC::System)
{
if (status == -1)
{
throw QEXC::System(description, errno);
}
return status;
}
FILE*
QUtil::fopen_wrapper(std::string const& description, FILE* f) throw (QEXC::System)
{
if (f == 0)
{
throw QEXC::System(description, errno);
}
return f;
}
char*
QUtil::copy_string(std::string const& str)
{
char* result = new char[str.length() + 1];
// Use memcpy in case string contains nulls
result[str.length()] = '\0';
memcpy(result, str.c_str(), str.length());
return result;
}
bool
QUtil::get_env(std::string const& var, std::string* value)
{
// This was basically ripped out of wxWindows.
#ifdef _WIN32
// first get the size of the buffer
DWORD len = ::GetEnvironmentVariable(var.c_str(), NULL, 0);
if (len == 0)
{
// this means that there is no such variable
return false;
}
if (value)
{
char* t = new char[len + 1];
::GetEnvironmentVariable(var.c_str(), t, len);
*value = t;
delete [] t;
}
return true;
#else
char* p = getenv(var.c_str());
if (p == 0)
{
return false;
}
if (value)
{
*value = p;
}
return true;
#endif
}
std::string
QUtil::toUTF8(unsigned long uval)
{
std::string result;
// A UTF-8 encoding of a Unicode value is a single byte for
// Unicode values <= 127. For larger values, the first byte of
// the UTF-8 encoding has '1' as each of its n highest bits and
// '0' for its (n+1)th highest bit where n is the total number of
// bytes required. Subsequent bytes start with '10' and have the
// remaining 6 bits free for encoding. For example, an 11-bit
// unicode value can be stored in two bytes where the first is
// 110zzzzz, the second is 10zzzzzz, and the z's represent the
// remaining bits.
if (uval > 0x7fffffff)
{
throw QEXC::General("bounds error in QUtil::toUTF8");
}
else if (uval < 128)
{
result += (char)(uval);
}
else
{
unsigned char bytes[7];
bytes[6] = '\0';
unsigned char* cur_byte = &bytes[5];
// maximum value that will fit in the current number of bytes
unsigned char maxval = 0x3f; // six bits
while (uval > maxval)
{
// Assign low six bits plus 10000000 to lowest unused
// byte position, then shift
*cur_byte = (unsigned char) (0x80 + (uval & 0x3f));
uval >>= 6;
// Maximum that will fit in high byte now shrinks by one bit
maxval >>= 1;
// Slide to the left one byte
--cur_byte;
if (cur_byte < bytes)
{
throw QEXC::Internal("QUtil::toUTF8: overflow error");
}
}
// If maxval is k bits long, the high (7 - k) bits of the
// resulting byte must be high.
*cur_byte = (unsigned char)((0xff - (1 + (maxval << 1))) + uval);
result += (char*)cur_byte;
}
return result;
}
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