1 files changed, 271 insertions, 0 deletions

diff --git a/source/OSSupport/File.cpp b/source/OSSupport/File.cpp
new file mode 100644
index 000000000..fdae0b34e
--- /dev/null
+++ b/source/OSSupport/File.cpp
@@ -0,0 +1,271 @@
+
+// cFile.cpp
+
+// Implements the cFile class providing an OS-independent abstraction of a file.
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "File.h"
+
+
+
+
+
+
+/// Simple constructor - creates an unopened file object, use Open() to open / create a real file
+cFile::cFile(void) :
+	#ifdef USE_STDIO_FILE
+	m_File(NULL)
+	#else
+	m_File(INVALID_HANDLE_VALUE)
+	#endif  // USE_STDIO_FILE
+{
+	// Nothing needed yet
+}
+
+
+
+
+
+/// Constructs and opens / creates the file specified, use IsOpen() to check for success
+cFile::cFile(const AString & iFileName, EMode iMode) :
+	#ifdef USE_STDIO_FILE
+	m_File(NULL)
+	#else
+	m_File(INVALID_HANDLE_VALUE)
+	#endif  // USE_STDIO_FILE
+{
+	Open(iFileName, iMode);
+}
+
+
+
+
+
+/// Auto-closes the file, if open
+cFile::~cFile()
+{
+	if (IsOpen())
+	{
+		Close();
+	}
+}
+
+
+
+
+
+bool cFile::Open(const AString & iFileName, EMode iMode)
+{
+	ASSERT(!IsOpen());  // You should close the file before opening another one
+	
+	if (IsOpen())
+	{
+		Close();
+	}
+	
+	const char * Mode = NULL;
+	switch (iMode)
+	{
+		case fmRead:      Mode = "rb";  break;
+		case fmWrite:     Mode = "wb";  break;
+		case fmReadWrite: Mode = "rb+"; break;
+		default:
+		{
+			ASSERT(!"Unhandled file mode");
+			return false;
+		}
+	}
+	m_File = fopen( (FILE_IO_PREFIX + iFileName).c_str(), Mode);
+	if ((m_File == NULL) && (iMode == fmReadWrite))
+	{
+		// Fix for MS not following C spec, opening "a" mode files for writing at the end only
+		// The file open operation has been tried with "read update", fails if file not found
+		// So now we know either the file doesn't exist or we don't have rights, no need to worry about file contents.
+		// Simply re-open for read-writing, erasing existing contents:
+		m_File = fopen( (FILE_IO_PREFIX + iFileName).c_str(), "wb+");
+	}
+	return (m_File != NULL);
+}
+
+
+
+
+
+void cFile::Close(void)
+{
+	ASSERT(IsOpen());  // You should not close file objects that don't have an open file.
+	
+	if (!IsOpen())
+	{
+		return;
+	}
+
+	fclose(m_File);
+	m_File = NULL;
+}
+
+
+
+
+
+bool cFile::IsOpen(void) const
+{
+	return (m_File != NULL);
+}
+
+
+
+
+
+bool cFile::IsEOF(void) const
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		// Unopened files behave as at EOF
+		return true;
+	}
+	
+	return (feof(m_File) != 0);
+}
+
+
+
+
+
+/// Reads  up to iNumBytes bytes into iBuffer, returns the number of bytes actually read,    or -1 on failure; asserts if not open
+int cFile::Read (void * iBuffer, int iNumBytes)
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		return -1;
+	}
+	
+	return fread(iBuffer, 1, iNumBytes, m_File);  // fread() returns the portion of Count parameter actually read, so we need to send iNumBytes as Count
+}
+
+
+
+
+
+/// Writes up to iNumBytes bytes from iBuffer, returns the number of bytes actually written, or -1 on failure; asserts if not open
+int cFile::Write(const void * iBuffer, int iNumBytes)
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		return -1;
+	}
+
+	int res = fwrite(iBuffer, 1, iNumBytes, m_File);  // fwrite() returns the portion of Count parameter actually written, so we need to send iNumBytes as Count
+	return res;
+}
+
+
+
+
+
+/// Seeks to iPosition bytes from file start, returns old position or -1 for failure
+int cFile::Seek (int iPosition)
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		return -1;
+	}
+	
+	if (fseek(m_File, iPosition, SEEK_SET) != 0)
+	{
+		return -1;
+	}
+	return ftell(m_File);
+}
+
+
+
+
+
+
+/// Returns the current position (bytes from file start)
+int cFile::Tell (void) const
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		return -1;
+	}
+	
+	return ftell(m_File);
+}
+
+
+
+
+
+/// Returns the size of file, in bytes, or -1 for failure; asserts if not open
+int cFile::GetSize(void) const
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		return -1;
+	}
+	
+	int CurPos = ftell(m_File);
+	if (CurPos < 0)
+	{
+		return -1;
+	}
+	if (fseek(m_File, 0, SEEK_END) != 0)
+	{
+		return -1;
+	}
+	int res = ftell(m_File);
+	if (fseek(m_File, CurPos, SEEK_SET) != 0)
+	{
+		return -1;
+	}
+	return res;
+}
+
+
+
+
+
+int cFile::ReadRestOfFile(AString & a_Contents)
+{
+	ASSERT(IsOpen());
+	
+	if (!IsOpen())
+	{
+		return -1;
+	}
+	
+	int DataSize = GetSize() - Tell();
+	
+	// HACK: This depends on the internal knowledge that AString's data() function returns the internal buffer directly
+	a_Contents.assign(DataSize, '\0');
+	return Read((void *)a_Contents.data(), DataSize);
+}
+
+
+
+
+
+bool cFile::Exists(const AString & a_FileName)
+{
+	cFile test(a_FileName, fmRead);
+	return test.IsOpen();
+}
+
+
+
+