f4583fda98
git-svn-id: http://mc-server.googlecode.com/svn/trunk@196 0a769ca7-a7f5-676a-18bf-c427514a06d6
232 lines
3.5 KiB
C++
232 lines
3.5 KiB
C++
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// cFile.cpp
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// Implements the cFile class providing an OS-independent abstraction of a file.
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#include "Globals.h" // NOTE: MSVC stupidness requires this to be the same across all modules
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#include "cFile.h"
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/// Simple constructor - creates an unopened file object, use Open() to open / create a real file
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cFile::cFile(void) :
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#ifdef USE_STDIO_FILE
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m_File(NULL)
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#else
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m_File(INVALID_HANDLE_VALUE)
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#endif // USE_STDIO_FILE
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{
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// Nothing needed yet
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}
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/// Constructs and opens / creates the file specified, use IsOpen() to check for success
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cFile::cFile(const char * iFileName, EMode iMode) :
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#ifdef USE_STDIO_FILE
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m_File(NULL)
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#else
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m_File(INVALID_HANDLE_VALUE)
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#endif // USE_STDIO_FILE
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{
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Open(iFileName, iMode);
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}
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/// Auto-closes the file, if open
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cFile::~cFile()
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{
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if (IsOpen())
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{
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Close();
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}
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}
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bool cFile::Open(const char * iFileName, EMode iMode)
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{
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assert(!IsOpen()); // You should close the file before opening another one
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if (IsOpen())
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{
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Close();
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}
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const char * Mode = NULL;
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switch (iMode)
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{
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case fmRead: Mode = "rb"; break;
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case fmWrite: Mode = "wb"; break;
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case fmReadWrite: Mode = "ab+"; break;
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default:
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{
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assert(!"Unhandled file mode");
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return false;
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}
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}
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m_File = fopen(iFileName, Mode);
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return (m_File != NULL);
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}
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void cFile::Close(void)
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{
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assert(IsOpen()); // You should not close file objects that don't have an open file.
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if (!IsOpen())
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{
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return;
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}
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fclose(m_File);
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}
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bool cFile::IsOpen(void) const
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{
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return (m_File != NULL);
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}
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bool cFile::IsEOF(void) const
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{
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assert(IsOpen());
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if (!IsOpen())
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{
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// Unopened files behave as at EOF
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return true;
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}
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return (feof(m_File) != 0);
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}
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/// Reads up to iNumBytes bytes into iBuffer, returns the number of bytes actually read, or -1 on failure; asserts if not open
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int cFile::Read (void * iBuffer, int iNumBytes)
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{
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assert(IsOpen());
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if (!IsOpen())
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{
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return -1;
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}
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return fread(iBuffer, 1, iNumBytes, m_File); // fread() returns the portion of Count parameter actually read, so we need to send iNumBytes as Count
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}
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/// Writes up to iNumBytes bytes from iBuffer, returns the number of bytes actually written, or -1 on failure; asserts if not open
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int cFile::Write(const void * iBuffer, int iNumBytes)
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{
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assert(IsOpen());
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if (!IsOpen())
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{
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return -1;
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}
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return fwrite(iBuffer, 1, iNumBytes, m_File); // fwrite() returns the portion of Count parameter actually written, so we need to send iNumBytes as Count
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}
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/// Seeks to iPosition bytes from file start, returns old position or -1 for failure
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int cFile::Seek (int iPosition)
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{
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assert(IsOpen());
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if (!IsOpen())
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{
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return -1;
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}
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if (fseek(m_File, iPosition, SEEK_SET) != 0)
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{
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return -1;
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}
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return ftell(m_File);
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}
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/// Returns the current position (bytes from file start)
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int cFile::Tell (void) const
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{
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assert(IsOpen());
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if (!IsOpen())
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{
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return -1;
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}
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return ftell(m_File);
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}
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/// Returns the size of file, in bytes, or -1 for failure; asserts if not open
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int cFile::GetSize(void) const
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{
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assert(IsOpen());
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if (!IsOpen())
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{
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return -1;
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}
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int CurPos = ftell(m_File);
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if (CurPos < 0)
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{
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return -1;
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}
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if (fseek(m_File, 0, SEEK_END) != 0)
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{
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return -1;
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}
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int res = ftell(m_File);
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if (fseek(m_File, CurPos, SEEK_SET) != 0)
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{
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return -1;
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}
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return res;
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}
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