MAINT-4744: Eliminate viewer dependency on (old) GNU libstdc++.

To be more accurate, this changeset doesn't actually eliminate the dependency:
it eliminates the use cases for the llifstream / llofstream feature that
requires it.
Currently you can construct an llifstream or llofstream from an open LLFILE*
file handle (or, except on Windows, an int file descriptor). But rather than
containing a streambuf implementation based on FILE*, llfile.h relies on the
fact that the Windows std::filebuf happens to support that as a nonstandard
extension; also on a nonstandard GNU extension __gnu_cxx::stdio_filebuf<char>.
To move from GNU libstdc++ to clang's libc++ (the direction on Mac), we could
code a streambuf that supports FILE*. But before doing that, it's worth asking
whether anyone actually uses this questionable feature.
In fact there were only two methods: LLWearable::exportFile() and importFile()
-- and only one call to either, in LLViewerWearable::saveNewAsset(). The code
in saveNewAsset() opened the LLFILE* immediately before calling exportFile(),
meaning we could reasonably push the open operation down into exportFile().
That logic was complex anyway due to the need for the caller to close the
LLFILE* regardless of the success of the exportFile().
Change LLWearable::exportFile() and importFile() to accept a std::string
filename rather than an open LLFILE*. Change LLViewerWearable::saveNewAsset()
to simply call exportFile(filename) rather than horsing around with an LLFILE*
handle. (This improves the code in another way too: it encapsulates the need
to open the relevant file in binary mode. Previously, each caller had to
remember to do that.)
To prevent inadvertent reintroduction of ll[io]fstream(LLFILE*) code, add
llstream_LLFILE preprocessor macro (default 0) to control access to the
relevant constructors. Also suppress rdbuf() override, the only method whose
signature references llstdio_filebuf.

2 files changed, 9 insertions, 8 deletions

diff --git a/indra/llappearance/llwearable.cpp b/indra/llappearance/llwearable.cpp
index 4bce3f99ed..41c06f4368 100755
--- a/indra/llappearance/llwearable.cpp
+++ b/indra/llappearance/llwearable.cpp
@@ -86,10 +86,10 @@ LLAssetType::EType LLWearable::getAssetType() const
 	return LLWearableType::getAssetType(mType);
 }
 
-BOOL LLWearable::exportFile(LLFILE* fp) const
+BOOL LLWearable::exportFile(const std::string& filename) const
 {
-	llofstream ofs(fp);
-	return exportStream(ofs);
+	llofstream ofs(filename, std::ios_base::out | std::ios_base::trunc | std::ios_base::binary);
+	return ofs.is_open() && exportStream(ofs);
 }
 
 // virtual
@@ -201,10 +201,11 @@ void LLWearable::createLayers(S32 te, LLAvatarAppearance *avatarp)
 	}
 }
 
-LLWearable::EImportResult LLWearable::importFile(LLFILE* fp, LLAvatarAppearance* avatarp )
+LLWearable::EImportResult LLWearable::importFile(const std::string& filename,
+												 LLAvatarAppearance* avatarp )
 {
-	llifstream ifs(fp);
-	return importStream(ifs, avatarp);
+	llifstream ifs(filename, std::ios_base::in | std::ios_base::binary);
+	return (! ifs.is_open())? FAILURE : importStream(ifs, avatarp);
 }
 
 // virtual
diff --git a/indra/llappearance/llwearable.h b/indra/llappearance/llwearable.h
index 630eb1e3a5..875c2932f1 100755
--- a/indra/llappearance/llwearable.h
+++ b/indra/llappearance/llwearable.h
@@ -81,8 +81,8 @@ public:
 		SUCCESS,
 		BAD_HEADER
 	};
-	BOOL				exportFile(LLFILE* file) const;
-	EImportResult		importFile(LLFILE* file, LLAvatarAppearance* avatarp );
+	BOOL				exportFile(const std::string& filename) const;
+	EImportResult		importFile(const std::string& filename, LLAvatarAppearance* avatarp );
 	virtual BOOL				exportStream( std::ostream& output_stream ) const;
 	virtual EImportResult		importStream( std::istream& input_stream, LLAvatarAppearance* avatarp );