source: vbox/trunk/src/libs/xpcom18a4/xpcom/obsolete/nsFileStream.cpp@ 6542

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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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//      First checked in on 98/12/08 by John R. McMullen.
//  Since nsFileStream.h is entirely templates, common code (such as open())
//  which does not actually depend on the charT, can be placed here.

#include "nsFileStream.h"
#include "nsFileSpec.h"
#include "nsIFileSpec.h"
#include "nsIStringStream.h"
#include "nsInt64.h"
#include <string.h>
#include <stdio.h>


//========================================================================================
//          nsInputStream
//========================================================================================

//----------------------------------------------------------------------------------------
nsInputStream::~nsInputStream()
//----------------------------------------------------------------------------------------
{
}

//----------------------------------------------------------------------------------------
char nsInputStream::get()
//----------------------------------------------------------------------------------------
{
        char c;
    if (read(&c, sizeof(c)) == sizeof(c))
        return c;
    return 0;
}

//----------------------------------------------------------------------------------------
PRInt32 nsInputStream::read(void* s, PRInt32 n)
//----------------------------------------------------------------------------------------
{
  if (!mInputStream)
      return 0;
  PRInt32 result = 0;
  mInputStream->Read((char*)s, n, (PRUint32*)&result);
  if (result == 0)
      set_at_eof(PR_TRUE);
  return result;
} // nsInputStream::read

//----------------------------------------------------------------------------------------
static void TidyEndOfLine(char*& cp)
// Assumes that cp is pointing at \n or \r.  Nulls out the character, checks for
// a second terminator (of the opposite persuasion), and returns cp pointing past the
// entire eol construct (one or two characters).
//----------------------------------------------------------------------------------------
{
    char ch = *cp;
    *cp++ = '\0'; // terminate at the newline, then skip past it
    if ((ch == '\n' && *cp == '\r') || (ch == '\r' && *cp == '\n'))
        cp++; // possibly a pair.
}

//----------------------------------------------------------------------------------------
nsInputStream& nsInputStream::operator >> (char& c)
//----------------------------------------------------------------------------------------
{
        c = get();
        return *this;
}

//========================================================================================
//          nsOutputStream
//========================================================================================

//----------------------------------------------------------------------------------------
nsOutputStream::~nsOutputStream()
//----------------------------------------------------------------------------------------
{
}

//----------------------------------------------------------------------------------------
void nsOutputStream::put(char c)
//----------------------------------------------------------------------------------------
{
    write(&c, sizeof(c));
}

//----------------------------------------------------------------------------------------
PRInt32 nsOutputStream::write(const void* s, PRInt32 n)
//----------------------------------------------------------------------------------------
{
  if (!mOutputStream)
      return 0;
  PRInt32 result = 0;
  mWriteStatus = mOutputStream->Write((char*)s, n, (PRUint32*)&result);
  return result;
} // nsOutputStream::write

//----------------------------------------------------------------------------------------
nsresult nsOutputStream::flush()
//----------------------------------------------------------------------------------------
{
  return NS_OK;
}

//----------------------------------------------------------------------------------------
nsresult nsOutputStream::lastWriteStatus()
//----------------------------------------------------------------------------------------
{
  return mWriteStatus;
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (char c)
//----------------------------------------------------------------------------------------
{
        put(c);
        return *this;
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (const char* s)
//----------------------------------------------------------------------------------------
{
        if (s)
                write(s, strlen(s));
        return *this;
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (short val)
//----------------------------------------------------------------------------------------
{
        char buf[30];
        sprintf(buf, "%hd", val);
        return (*this << buf);
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (unsigned short val)
//----------------------------------------------------------------------------------------
{
        char buf[30];
        sprintf(buf, "%hu", val);
        return (*this << buf);
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (long val)
//----------------------------------------------------------------------------------------
{
        char buf[30];
        sprintf(buf, "%ld", val);
        return (*this << buf);
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (unsigned long val)
//----------------------------------------------------------------------------------------
{
        char buf[30];
        sprintf(buf, "%lu", val);
        return (*this << buf);
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (int val)
//----------------------------------------------------------------------------------------
{
        char buf[30];
        sprintf(buf, "%d", val);
        return (*this << buf);
}

//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (unsigned int val)
//----------------------------------------------------------------------------------------
{
        char buf[30];
        sprintf(buf, "%u", val);
        return (*this << buf);
}

//========================================================================================
//          nsRandomAccessInputStream
//========================================================================================

//----------------------------------------------------------------------------------------
PRBool nsRandomAccessInputStream::readline(char* s, PRInt32 n)
// This will truncate if the buffer is too small.  Result will always be null-terminated.
//----------------------------------------------------------------------------------------
{
    PRBool bufferLargeEnough = PR_TRUE; // result
    if (!s || !n)
        return PR_TRUE;

    nsInt64 position = tell();
    const nsInt64 zero(0);
    if (position < zero)
        return PR_FALSE;
    PRInt32 bytesRead = read(s, n - 1);
    if (failed())
        return PR_FALSE;
    s[bytesRead] = '\0'; // always terminate at the end of the buffer
    char* tp = strpbrk(s, "\n\r");
    if (tp)
    {
        TidyEndOfLine(tp);
        bytesRead = (tp - s);
    }
    else if (!eof() && n-1 == bytesRead)
        bufferLargeEnough = PR_FALSE;
    position += bytesRead;
    seek(position);
    return bufferLargeEnough;
} // nsRandomAccessInputStream::readline

//========================================================================================
//          nsInputStringStream
//========================================================================================

//----------------------------------------------------------------------------------------
nsInputStringStream::nsInputStringStream(const char* stringToRead)
//----------------------------------------------------------------------------------------
{
        nsCOMPtr<nsIInputStream> stream;
        if (NS_FAILED(NS_NewCharInputStream(getter_AddRefs(stream), stringToRead)))
                return;
        mInputStream = stream;
        mStore = do_QueryInterface(stream);
}

//----------------------------------------------------------------------------------------
nsInputStringStream::nsInputStringStream(const nsString& stringToRead)
//----------------------------------------------------------------------------------------
{
        if (NS_FAILED(NS_NewStringInputStream(getter_AddRefs(mInputStream), stringToRead)))
                return;
        mStore = do_QueryInterface(mInputStream);
}


//========================================================================================
//          nsInputFileStream
//========================================================================================

//----------------------------------------------------------------------------------------
nsInputFileStream::nsInputFileStream(
        const nsFileSpec& inFile,
        int nsprMode,
        PRIntn accessMode)
//----------------------------------------------------------------------------------------
{
        nsISupports* stream;
        if (NS_FAILED(NS_NewIOFileStream(&stream, inFile, nsprMode, accessMode)))
        return;
        AssignFrom(stream);
        NS_RELEASE(stream);
} // nsInputFileStream::nsInputFileStream

//----------------------------------------------------------------------------------------
nsInputFileStream::nsInputFileStream(nsIFileSpec* inSpec)
//----------------------------------------------------------------------------------------
{
        nsIInputStream* stream;
        if (NS_FAILED(inSpec->GetInputStream(&stream)))
        return;
        AssignFrom(stream);
        NS_RELEASE(stream);
} // nsInputFileStream::nsInputFileStream

//----------------------------------------------------------------------------------------
nsInputFileStream::~nsInputFileStream()
//----------------------------------------------------------------------------------------
{
//    if (is_open())
//      close();
}

//----------------------------------------------------------------------------------------
void nsInputFileStream::AssignFrom(nsISupports* stream)
//----------------------------------------------------------------------------------------
{
        mFile = do_QueryInterface(stream);
        mInputStream = do_QueryInterface(stream);
        mStore = do_QueryInterface(stream);
        mFileInputStream = do_QueryInterface(stream);
}

//========================================================================================
//          nsOutputFileStream
//========================================================================================

//----------------------------------------------------------------------------------------
nsOutputFileStream::nsOutputFileStream(nsIFileSpec* inSpec)
//----------------------------------------------------------------------------------------
{
        if (!inSpec)
                return;
        nsIOutputStream* stream;
        if (NS_FAILED(inSpec->GetOutputStream(&stream)))
          return;
        AssignFrom(stream);
        NS_RELEASE(stream);
}

//----------------------------------------------------------------------------------------
nsOutputFileStream::~nsOutputFileStream()
//----------------------------------------------------------------------------------------
{
//    if (is_open())
//      close();
}
//----------------------------------------------------------------------------------------
void nsOutputFileStream::AssignFrom(nsISupports* stream)
//----------------------------------------------------------------------------------------
{
    mFile = do_QueryInterface(stream);
    mOutputStream = do_QueryInterface(stream);
    mStore = do_QueryInterface(stream);
    mFileOutputStream = do_QueryInterface(stream);
}

//----------------------------------------------------------------------------------------
nsresult nsOutputFileStream::flush()
//----------------------------------------------------------------------------------------
{
        if (mFileOutputStream)
                mFileOutputStream->Flush();
    return error();
}

//----------------------------------------------------------------------------------------
void nsOutputFileStream::abort()
//----------------------------------------------------------------------------------------
{
        mResult = NS_FILE_FAILURE;
        close();
}

//========================================================================================
//        Manipulators
//========================================================================================

//----------------------------------------------------------------------------------------
nsOutputStream& nsEndl(nsOutputStream& os)
//----------------------------------------------------------------------------------------
{
#if defined(XP_WIN) || defined(XP_OS2)
    os.write("\r\n", 2);
#elif defined (XP_MAC)
    os.put('\r');
#else
    os.put('\n');
#endif
    //os.flush();
    return os;
} // nsEndl