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/*
* Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/wtf/text/line_ending.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/string_buffer.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace WTF {
namespace {
template <typename CharType>
wtf_size_t RequiredSizeForCRLF(const CharType* data, wtf_size_t length) {
wtf_size_t new_len = 0;
const CharType* p = data;
while (p < data + length) {
CharType c = *p++;
if (c == '\r') {
if (p >= data + length || *p != '\n') {
// Turn CR into CRLF.
new_len += 2;
} else {
// We already have \r\n. We don't count this \r, and the
// following \n will count 2.
}
} else if (c == '\n') {
// Turn LF into CRLF.
new_len += 2;
} else {
// Leave other characters alone.
new_len += 1;
}
}
return new_len;
}
template <typename CharType>
void NormalizeToCRLF(const CharType* src, wtf_size_t src_length, CharType* q) {
const CharType* p = src;
while (p < src + src_length) {
CharType c = *p++;
if (c == '\r') {
if (p >= src + src_length || *p != '\n') {
// Turn CR into CRLF.
*q++ = '\r';
*q++ = '\n';
}
} else if (c == '\n') {
// Turn LF into CRLF.
*q++ = '\r';
*q++ = '\n';
} else {
// Leave other characters alone.
*q++ = c;
}
}
}
#if BUILDFLAG(IS_WIN)
void InternalNormalizeLineEndingsToCRLF(const std::string& from,
Vector<char>& buffer) {
size_t new_len = RequiredSizeForCRLF(from.c_str(), from.length());
if (new_len < from.length())
return;
if (new_len == from.length()) {
buffer.AppendSpan(base::span(from));
return;
}
wtf_size_t old_buffer_size = buffer.size();
buffer.Grow(old_buffer_size + new_len);
char* write_position = buffer.data() + old_buffer_size;
NormalizeToCRLF(from.c_str(), from.length(), write_position);
}
#endif // BUILDFLAG(IS_WIN)
} // namespace
void NormalizeLineEndingsToLF(const std::string& from, Vector<char>& result) {
// Compute the new length.
wtf_size_t new_len = 0;
bool need_fix = false;
const char* p = from.c_str();
char from_ending_char = '\r';
char to_ending_char = '\n';
while (p < from.c_str() + from.length()) {
char c = *p++;
if (c == '\r' && *p == '\n') {
// Turn CRLF into CR or LF.
p++;
need_fix = true;
} else if (c == from_ending_char) {
// Turn CR/LF into LF/CR.
need_fix = true;
}
new_len += 1;
}
// Grow the result buffer.
p = from.c_str();
wtf_size_t old_result_size = result.size();
result.Grow(old_result_size + new_len);
char* q = result.data() + old_result_size;
// If no need to fix the string, just copy the string over.
if (!need_fix) {
memcpy(q, p, from.length());
return;
}
// Make a copy of the string.
while (p < from.c_str() + from.length()) {
char c = *p++;
if (c == '\r' && *p == '\n') {
// Turn CRLF or CR into CR or LF.
p++;
*q++ = to_ending_char;
} else if (c == from_ending_char) {
// Turn CR/LF into LF/CR.
*q++ = to_ending_char;
} else {
// Leave other characters alone.
*q++ = c;
}
}
}
String NormalizeLineEndingsToCRLF(const String& src) {
wtf_size_t length = src.length();
if (length == 0)
return src;
if (src.Is8Bit()) {
wtf_size_t new_length = RequiredSizeForCRLF(src.Characters8(), length);
if (new_length == length)
return src;
StringBuffer<LChar> buffer(new_length);
NormalizeToCRLF(src.Characters8(), length, buffer.Characters());
return String::Adopt(buffer);
}
wtf_size_t new_length = RequiredSizeForCRLF(src.Characters16(), length);
if (new_length == length)
return src;
StringBuffer<UChar> buffer(new_length);
NormalizeToCRLF(src.Characters16(), length, buffer.Characters());
return String::Adopt(buffer);
}
void NormalizeLineEndingsToNative(const std::string& from,
Vector<char>& result) {
#if BUILDFLAG(IS_WIN)
InternalNormalizeLineEndingsToCRLF(from, result);
#else
NormalizeLineEndingsToLF(from, result);
#endif
}
} // namespace WTF
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