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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2006 Jos van den Oever <jos@vandenoever.info>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <strigi/textutils.h>
#include <stdio.h>
#include <cstring>
/**
* Return the position of the first byte that is not valid
* utf8. Return value of 0 means that the entire string is valid.
* If the last character is incomplete the returned value points to the start
* of that character and nb is set to the number of characters that is missing.
**/
bool
Strigi::checkUtf8(const char* p, int32_t length) {
const char* end = p + length;
// check if the text is valid UTF-8
char nb = 0;
uint64_t val = 0;
while (p < end) {
unsigned char c = *p;
if (nb) {
if ((0xC0 & c) != 0x80) {
return false;
}
val = (val << 6) + (c & 0x3F);
if (--nb == 0) {
// check the range of the utf 8 value
if (val == 0xFFFE || val == 0xFFFF // Noncharacters
// surrogate values not allowed in UTF-8
|| (val >= 0xD800 && val <= 0xDFFF)) {
return false;
}
}
} else if (c >= 0xC2 && c <= 0xDF) {
nb = 1;
val = c & 0x1F;
} else if ((0xF0 & c) == 0xE0) {
nb = 2;
val = c & 0x0F;
} else if (c >= 0xF0 && c <= 0xF4) {
nb = 3;
val = c & 0x07;
} else if (c > 0x7F
|| (c < 0x20 && !(c == 0x9 || c == 0xA || c == 0xD))) {
return false;
}
p++;
}
// the string is only valid utf8 if it contains only complete characters
return nb == 0;
}
bool
Strigi::checkUtf8(const std::string& p) {
return checkUtf8(p.c_str(), (int32_t)p.size());
}
// http://www.w3.org/TR/REC-xml/#charsetsa
// http://tools.ietf.org/html/rfc3629
/**
* Return the position of the first byte that is not valid
* utf8. Return value of 0 means that the entire string is valid.
* If the last character is incomplete the returned value points to the start
* of that character and nb is set to the number of characters that is missing.
* If there is an error, nb == 0.
**/
const char*
Strigi::checkUtf8(const char* p, int32_t length, char& nb) {
const char* end = p + length;
const char* cs = p;
uint64_t val = 0;
// check if the text is valid UTF-8
nb = 0;
while (p < end) {
unsigned char c = *p;
//unsigned char d = c & 0xFE;
if (nb) {
if ((0xC0 & c) != 0x80) {
nb = 0;
return p;
}
val = (val << 6) + (c & 0x3F);
if (--nb == 0) {
// check the range of the utf 8 value
if (val == 0xFFFE || val == 0xFFFF // Noncharacters
// surrogate values not allowed in UTF-8
|| (val >= 0xD800 && val <= 0xDFFF)) {
// nb is 0 to signal an error
return p;
}
}
} else if (c >= 0xC2 && c <= 0xDF) {
cs = p;
val = c & 0x1F;
nb = 1;
} else if ((0xF0 & c) == 0xE0) {
cs = p;
val = c & 0x0F;
nb = 2;
} else if (c >= 0xF0 && c <= 0xF4) {
cs = p;
val = c & 0x07;
nb = 3;
} else if (c > 0x7F
|| (c < 0x20 && !(c == 0x9 || c == 0xA || c == 0xD))) {
return p;
}
p++;
}
// the string is only valid utf8 if it contains only complete characters
return (nb) ?cs :0;
}
const char*
Strigi::checkUtf8(const std::string& p, char& nb) {
return checkUtf8(p.c_str(), (int32_t)p.size(), nb);
}
/**
* convert the \r and \n in utf8 strings into spaces
**/
void
Strigi::convertNewLines(char* p) {
size_t len = std::strlen(p);
bool ok = checkUtf8(p, (int32_t)len);
if (!ok) fprintf(stderr, "string is not valid utf8\n");
const char* end = p+len;
char nb = 0;
while (p < end) {
unsigned char c = *p;
if (nb) {
if ((0xC0 & c) != 0x80) {
return;
}
nb--;
} else if (c >= 0xC2 && c <= 0xDF) {
nb = 1;
} else if ((0xF0 & c) == 0xE0) {
nb = 2;
} else if (c >= 0xF0 && c <= 0xF4) {
nb = 3;
} else if (c == '\n' || c == '\r') {
*p = ' ';
}
p++;
}
}
#define swap16(x) \
((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
#define swap32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) \
| (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#define swap64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
#ifdef __BIG_ENDIAN__
int16_t
Strigi::readLittleEndianInt16(const char* c) {
return (int16_t)swap16(*reinterpret_cast<const int16_t*>(c));
}
uint16_t
Strigi::readLittleEndianUInt16(const char* c) {
return swap16(*reinterpret_cast<const uint16_t*>(c));
}
int32_t
Strigi::readLittleEndianInt32(const char* c) {
return swap32(*reinterpret_cast<const int32_t*>(c));
}
uint32_t
Strigi::readLittleEndianUInt32(const char* c) {
return swap32(*reinterpret_cast<const uint32_t*>(c));
}
int64_t
Strigi::readLittleEndianInt64(const char* c) {
return swap64(*reinterpret_cast<const int64_t*>(c));
}
uint64_t
Strigi::readLittleEndianUInt64(const char* c) {
return swap64(*reinterpret_cast<const uint64_t*>(c));
}
#else
int16_t
Strigi::readBigEndianInt16(const char* c) {
return (int16_t)swap16(*reinterpret_cast<const int16_t*>(c));
}
uint16_t
Strigi::readBigEndianUInt16(const char* c) {
return (uint16_t)swap16(*reinterpret_cast<const uint16_t*>(c));
}
int32_t
Strigi::readBigEndianInt32(const char* c) {
return swap32(*reinterpret_cast<const int32_t*>(c));
}
uint32_t
Strigi::readBigEndianUInt32(const char* c) {
return swap32(*reinterpret_cast<const uint32_t*>(c));
}
int64_t
Strigi::readBigEndianInt64(const char* c) {
return swap64(*reinterpret_cast<const int64_t*>(c));
}
uint64_t
Strigi::readBigEndianUInt64(const char* c) {
return swap64(*reinterpret_cast<const uint64_t*>(c));
}
#endif
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