Okay, imported the core-http library and got it compiling suspiciously easily.

The unit/integration tests don't work yet as I'm still battling cmake/autobuild
as usual but first milestone passed.

1 files changed, 168 insertions, 0 deletions

diff --git a/indra/llcorehttp/bufferarray.h b/indra/llcorehttp/bufferarray.h
new file mode 100644
index 0000000000..b26ad1b297
--- /dev/null
+++ b/indra/llcorehttp/bufferarray.h
@@ -0,0 +1,168 @@
+/**
+ * @file bufferarray.h
+ * @brief Public-facing declaration for the BufferArray scatter/gather class
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef	_LLCORE_BUFFER_ARRAY_H_
+#define	_LLCORE_BUFFER_ARRAY_H_
+
+
+#include <cstdlib>
+#include <vector>
+
+#include "_refcounted.h"
+
+
+namespace LLCore
+{
+
+
+/// A very simple scatter/gather type map for bulk data.  The motivation
+/// for this class is the writedata callback used by libcurl.  Response
+/// bodies are delivered to the caller in a sequence of sequential write
+/// operations and this class captures them without having to reallocate
+/// and move data.
+///
+/// The interface looks a little like a unix file descriptor but only
+/// just.  There is a notion of a current position, starting from 0,
+/// which is used as the position in the data when performing read and
+/// write operations.  The position also moves after various operations:
+/// - seek(...)
+/// - read(...)
+/// - write(...)
+/// - append(...)
+/// - appendBufferAlloc(...)
+/// The object also keeps a total length value which is updated after
+/// write and append operations and beyond which the current position
+/// cannot be set.
+///
+/// Threading:  not thread-safe
+///
+/// Allocation:  Refcounted, heap only.  Caller of the constructor
+/// is given a single refcount.
+///
+class BufferArray : public LLCoreInt::RefCounted
+{
+public:
+	BufferArray();
+	virtual ~BufferArray();
+
+private:
+	BufferArray(const BufferArray &);			// Not defined
+	void operator=(const BufferArray &);		// Not defined
+
+public:
+	/// Appends the indicated data to the BufferArray
+	/// modifying current position and total size.  New
+	/// position is one beyond the final byte of the buffer.
+	///
+	/// @return			Count of bytes copied to BufferArray
+	size_t append(const char * src, size_t len);
+
+	/// Similar to @see append(), this call guarantees a
+	/// contiguous block of memory of requested size placed
+	/// at the current end of the BufferArray.  On return,
+	/// the data in the memory is considered valid whether
+	/// the caller writes to it or not.
+	///
+	/// @return			Pointer to contiguous region at end
+	///					of BufferArray of 'len' size.
+	char * appendBufferAlloc(size_t len);
+
+	/// Current count of bytes in BufferArray instance.
+	size_t size() const
+		{
+			return mLen;
+		}
+
+	/// Set the current position for subsequent read and
+	/// write operations.  'pos' values before the beginning
+	/// or greater than the size of the buffer are coerced
+	/// to a value within the buffer.
+	///
+	/// @return			Actual current position after seek.
+	size_t seek(size_t pos);
+
+	/// Copies data from the current position in the instance
+	/// to the caller's buffer.  Will return a short count of
+	/// bytes copied if the 'len' extends beyond the data.
+	size_t read(char * dst, size_t len);
+
+	/// Copies data from the caller's buffer to the instance
+	/// at the current position.  May overwrite existing data,
+	/// append data when current position is equal to the
+	/// size of the instance or do a mix of both.
+	size_t write(const char * src, size_t len);
+	
+protected:
+	int findBlock(size_t pos, size_t * ret_offset);
+	
+protected:
+	class Block;
+	typedef std::vector<Block *> container_t;
+
+	container_t			mBlocks;
+	size_t				mPos;
+	size_t				mLen;
+};  // end class BufferArray
+
+
+#if 0
+
+// Conceptual for now.  Another possibility is going with
+// something like Boost::asio's buffers interface.  They're
+// trying to achieve the same thing above and below....
+
+class BufferStream : public std::streambuf
+{
+public:
+	BufferStream(BufferArray * buffer);
+	virtual ~BufferStream();
+
+private:
+	BufferStream(const BufferStream &);			// Not defined
+	void operator=(const BufferStream &);		// Not defined
+
+public:
+	// Types
+	typedef std::streambuf::pos_type pos_type;
+	typedef std::streambuf::off_type off_type;
+
+	virtual int underflow();
+
+	virtual int overflow(int c);
+
+	virtual int sync();
+
+	virtual pos_type seekoff(off_type off, std::ios::seekdir way, std::ios::openmode which);
+
+protected:
+	BufferArray *		mBufferArray;
+};  // end class BufferStream
+
+#endif // 0
+
+}  // end namespace LLCore
+
+#endif	// _LLCORE_BUFFER_ARRAY_H_