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/*
* Message.cpp
* -----------
* Purpose: Various functions for processing song messages (allocating, reading from file...)
* Notes : Those functions should offer a rather high level of abstraction compared to
* previous ways of reading the song messages. There are still many things to do,
* though. Future versions of ReadMessage() could e.g. offer charset conversion
* and the code is not yet ready for unicode.
* Some functions for preparing the message text to be written to a file would
* also be handy.
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "Message.h"
#include "../common/FileReader.h"
OPENMPT_NAMESPACE_BEGIN
// Read song message from a mapped file.
// [in] data: pointer to the data in memory that is going to be read
// [in] length: number of characters that should be read. Trailing null characters are automatically removed.
// [in] lineEnding: line ending formatting of the text in memory.
// [out] returns true on success.
bool SongMessage::Read(const std::byte *data, size_t length, LineEnding lineEnding)
{
const char *str = mpt::byte_cast<const char *>(data);
while(length != 0 && str[length - 1] == '\0')
{
// Ignore trailing null character.
length--;
}
// Simple line-ending detection algorithm. VERY simple.
if(lineEnding == leAutodetect)
{
size_t nCR = 0, nLF = 0, nCRLF = 0;
// find CRs, LFs and CRLFs
for(size_t i = 0; i < length; i++)
{
char c = str[i];
if(c == '\r')
nCR++;
else if(c == '\n')
nLF++;
if(i && str[i - 1] == '\r' && c == '\n')
nCRLF++;
}
// evaluate findings
if(nCR == nLF && nCR == nCRLF)
lineEnding = leCRLF;
else if(nCR && !nLF)
lineEnding = leCR;
else if(!nCR && nLF)
lineEnding = leLF;
else
lineEnding = leMixed;
}
size_t finalLength = 0;
// calculate the final amount of characters to be allocated.
for(size_t i = 0; i < length; i++)
{
finalLength++;
if(str[i] == '\r' && lineEnding == leCRLF)
i++; // skip the LF
}
clear();
reserve(finalLength);
for(size_t i = 0; i < length; i++)
{
char c = str[i];
switch(c)
{
case '\r':
if(lineEnding != leLF)
c = InternalLineEnding;
else
c = ' ';
if(lineEnding == leCRLF)
i++; // skip the LF
break;
case '\n':
if(lineEnding != leCR && lineEnding != leCRLF)
c = InternalLineEnding;
else
c = ' ';
break;
case '\0':
c = ' ';
break;
default:
break;
}
push_back(c);
}
return true;
}
bool SongMessage::Read(FileReader &file, const size_t length, LineEnding lineEnding)
{
FileReader::off_t readLength = std::min(static_cast<FileReader::off_t>(length), file.BytesLeft());
FileReader::PinnedView fileView = file.ReadPinnedView(readLength);
bool success = Read(fileView.data(), fileView.size(), lineEnding);
return success;
}
// Read comments with fixed line length from a mapped file.
// [in] data: pointer to the data in memory that is going to be read
// [in] length: number of characters that should be read, not including a possible trailing null terminator (it is automatically appended).
// [in] lineLength: The fixed length of a line.
// [in] lineEndingLength: The padding space between two fixed lines. (there could for example be a null char after every line)
// [out] returns true on success.
bool SongMessage::ReadFixedLineLength(const std::byte *data, const size_t length, const size_t lineLength, const size_t lineEndingLength)
{
if(lineLength == 0)
return false;
clear();
reserve(length);
size_t readPos = 0, writePos = 0;
while(readPos < length)
{
size_t thisLineLength = std::min(lineLength, length - readPos);
append(mpt::byte_cast<const char *>(data) + readPos, thisLineLength);
append(1, InternalLineEnding);
// Fix weird chars
for(size_t pos = writePos; pos < writePos + thisLineLength; pos++)
{
switch(operator[](pos))
{
case '\0':
case '\n':
case '\r':
operator[](pos) = ' ';
break;
}
}
readPos += thisLineLength + std::min(lineEndingLength, length - readPos - thisLineLength);
writePos += thisLineLength + 1;
}
return true;
}
bool SongMessage::ReadFixedLineLength(FileReader &file, const size_t length, const size_t lineLength, const size_t lineEndingLength)
{
FileReader::off_t readLength = std::min(static_cast<FileReader::off_t>(length), file.BytesLeft());
FileReader::PinnedView fileView = file.ReadPinnedView(readLength);
bool success = ReadFixedLineLength(fileView.data(), fileView.size(), lineLength, lineEndingLength);
return success;
}
// Retrieve song message.
// [in] lineEnding: line ending formatting of the text in memory.
// [out] returns formatted song message.
std::string SongMessage::GetFormatted(const LineEnding lineEnding) const
{
std::string comments;
comments.reserve(length());
for(auto c : *this)
{
if(c == InternalLineEnding)
{
switch(lineEnding)
{
case leCR:
comments.push_back('\r');
break;
case leCRLF:
comments.push_back('\r');
comments.push_back('\n');
break;
case leLF:
comments.push_back('\n');
break;
default:
comments.push_back('\r');
break;
}
} else
{
comments.push_back(c);
}
}
return comments;
}
bool SongMessage::SetFormatted(std::string message, LineEnding lineEnding)
{
MPT_ASSERT(lineEnding == leLF || lineEnding == leCR || lineEnding == leCRLF);
switch(lineEnding)
{
case leLF:
message = mpt::replace(message, std::string("\n"), std::string(1, InternalLineEnding));
break;
case leCR:
message = mpt::replace(message, std::string("\r"), std::string(1, InternalLineEnding));
break;
case leCRLF:
message = mpt::replace(message, std::string("\r\n"), std::string(1, InternalLineEnding));
break;
default:
MPT_ASSERT_NOTREACHED();
break;
}
if(message == *this)
{
return false;
}
assign(std::move(message));
return true;
}
OPENMPT_NAMESPACE_END
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