Add bin and edit workflow

bin/gems/eventmachine-1.2.7/ext/fastfilereader/mapper.cpp

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+/*****************************************************************************
+
+$Id: mapper.cpp 4527 2007-07-04 10:21:34Z francis $
+
+File:     mapper.cpp
+Date:     02Jul07
+
+Copyright (C) 2007 by Francis Cianfrocca. All Rights Reserved.
+Gmail: garbagecat10
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of either: 1) the GNU General Public License
+as published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version; or 2) Ruby's License.
+
+See the file COPYING for complete licensing information.
+
+*****************************************************************************/
+
+
+//////////////////////////////////////////////////////////////////////
+// UNIX implementation
+//////////////////////////////////////////////////////////////////////
+
+
+#ifdef OS_UNIX
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <iostream>
+#include <string>
+#include <cstring>
+#include <stdexcept>
+
+#include "mapper.h"
+
+/******************
+Mapper_t::Mapper_t
+******************/
+
+Mapper_t::Mapper_t (const std::string &filename)
+{
+	/* We ASSUME we can open the file.
+	 * (More precisely, we assume someone else checked before we got here.)
+	 */
+
+	Fd = open (filename.c_str(), O_RDONLY);
+	if (Fd < 0)
+		throw std::runtime_error (strerror (errno));
+
+	struct stat st;
+	if (fstat (Fd, &st))
+		throw std::runtime_error (strerror (errno));
+	FileSize = st.st_size;
+
+	#ifdef OS_WIN32
+	MapPoint = (char*) mmap (0, FileSize, PROT_READ, MAP_SHARED, Fd, 0);
+	#else
+	MapPoint = (const char*) mmap (0, FileSize, PROT_READ, MAP_SHARED, Fd, 0);
+	#endif
+	if (MapPoint == MAP_FAILED)
+		throw std::runtime_error (strerror (errno));
+}
+
+
+/*******************
+Mapper_t::~Mapper_t
+*******************/
+
+Mapper_t::~Mapper_t()
+{
+	Close();
+}
+
+
+/***************
+Mapper_t::Close
+***************/
+
+void Mapper_t::Close()
+{
+	// Can be called multiple times.
+	// Calls to GetChunk are invalid after a call to Close.
+	if (MapPoint) {
+		#ifdef CC_SUNWspro
+		// TODO: The void * cast works fine on Solaris 11, but
+		// I don't know at what point that changed from older Solaris.
+		munmap ((char*)MapPoint, FileSize);
+		#else
+		munmap ((void*)MapPoint, FileSize);
+		#endif
+		MapPoint = NULL;
+	}
+	if (Fd >= 0) {
+		close (Fd);
+		Fd = -1;
+	}
+}
+
+/******************
+Mapper_t::GetChunk
+******************/
+
+const char *Mapper_t::GetChunk (unsigned start)
+{
+	return MapPoint + start;
+}
+
+
+
+#endif // OS_UNIX
+
+
+//////////////////////////////////////////////////////////////////////
+// WINDOWS implementation
+//////////////////////////////////////////////////////////////////////
+
+#ifdef OS_WIN32
+
+#include <windows.h>
+
+#include <iostream>
+#include <string>
+#include <stdexcept>
+
+#include "mapper.h"
+
+/******************
+Mapper_t::Mapper_t
+******************/
+
+Mapper_t::Mapper_t (const std::string &filename)
+{
+	/* We ASSUME we can open the file.
+	 * (More precisely, we assume someone else checked before we got here.)
+	 */
+
+	hFile = INVALID_HANDLE_VALUE;
+	hMapping = NULL;
+	MapPoint = NULL;
+	FileSize = 0;
+
+	hFile = CreateFile (filename.c_str(), GENERIC_READ|GENERIC_WRITE, FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+
+	if (hFile == INVALID_HANDLE_VALUE)
+		throw std::runtime_error ("File not found");
+
+	BY_HANDLE_FILE_INFORMATION i;
+	if (GetFileInformationByHandle (hFile, &i))
+		FileSize = i.nFileSizeLow;
+
+	hMapping = CreateFileMapping (hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
+	if (!hMapping)
+		throw std::runtime_error ("File not mapped");
+
+	#ifdef OS_WIN32
+	MapPoint = (char*) MapViewOfFile (hMapping, FILE_MAP_WRITE, 0, 0, 0);
+	#else
+	MapPoint = (const char*) MapViewOfFile (hMapping, FILE_MAP_WRITE, 0, 0, 0);
+	#endif
+	if (!MapPoint)
+		throw std::runtime_error ("Mappoint not read");
+}
+
+
+/*******************
+Mapper_t::~Mapper_t
+*******************/
+
+Mapper_t::~Mapper_t()
+{
+	Close();
+}
+
+/***************
+Mapper_t::Close
+***************/
+
+void Mapper_t::Close()
+{
+	// Can be called multiple times.
+	// Calls to GetChunk are invalid after a call to Close.
+	if (MapPoint) {
+		UnmapViewOfFile (MapPoint);
+		MapPoint = NULL;
+	}
+	if (hMapping != NULL) {
+		CloseHandle (hMapping);
+		hMapping = NULL;
+	}
+	if (hFile != INVALID_HANDLE_VALUE) {
+		CloseHandle (hFile);
+		hFile = INVALID_HANDLE_VALUE;
+	}
+}
+
+
+/******************
+Mapper_t::GetChunk
+******************/
+
+const char *Mapper_t::GetChunk (unsigned start)
+{
+	return MapPoint + start;
+}
+
+
+
+#endif // OS_WINDOWS