/*
 * DO NOT EDIT.  THIS FILE IS GENERATED FROM d:/BUILDS/tinderbox/Mozilla1.6/WINNT_5.0_Clobber/mozilla/xpcom/io/nsIInputStream.idl
 */

#ifndef __gen_nsIInputStream_h__
#define __gen_nsIInputStream_h__


#ifndef __gen_nsISupports_h__
#include "nsISupports.h"
#endif

/* For IDL files that don't want to include root IDL files. */
#ifndef NS_NO_VTABLE
#define NS_NO_VTABLE
#endif
class nsIInputStream; /* forward declaration */

/**
 * The signature of the writer function passed to ReadSegments. This
 * is the "consumer" of data that gets read from the stream's buffer.
 *
 * @param aInStream stream being read
 * @param aClosure opaque parameter passed to ReadSegments
 * @param aFromSegment pointer to memory owned by the input stream
 * @param aToOffset amount already read (since ReadSegments was called)
 * @param aCount length of fromSegment
 * @param aWriteCount number of bytes read
 *
 * Implementers should return the following:
 *
 * @return NS_OK and (*aWriteCount > 0) if consumed some data
 * @return <any-error> if not interested in consuming any data
 *
 * Errors are never passed to the caller of ReadSegments.
 *
 * NOTE: returning NS_OK and (*aWriteCount = 0) has undefined behavior.
 *
 * @status FROZEN
 */
typedef NS_CALLBACK(nsWriteSegmentFun)(nsIInputStream *aInStream,
                                       void *aClosure,
                                       const char *aFromSegment,
                                       PRUint32 aToOffset,
                                       PRUint32 aCount,
                                       PRUint32 *aWriteCount);

/* starting interface:    nsIInputStream */
#define NS_IINPUTSTREAM_IID_STR "fa9c7f6c-61b3-11d4-9877-00c04fa0cf4a"

#define NS_IINPUTSTREAM_IID \
  {0xfa9c7f6c, 0x61b3, 0x11d4, \
    { 0x98, 0x77, 0x00, 0xc0, 0x4f, 0xa0, 0xcf, 0x4a }}

class NS_NO_VTABLE nsIInputStream : public nsISupports {
 public: 

  NS_DEFINE_STATIC_IID_ACCESSOR(NS_IINPUTSTREAM_IID)

  /**
 * nsIInputStream
 *
 * @status FROZEN
 */
/** 
     * Close the stream.
     */
  /* void close (); */
  NS_IMETHOD Close(void) = 0;

  /**
     * @return number of bytes currently available in the stream
     */
  /* unsigned long available (); */
  NS_IMETHOD Available(PRUint32 *_retval) = 0;

  /** 
     * Read data from the stream.
     *
     * @param aBuf the buffer into which the data is to be read
     * @param aCount the maximum number of bytes to be read
     *
     * @return number of bytes read (may be less than aCount).
     * @return 0 if reached end of file
     *
     * @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream would
     *   block the calling thread (non-blocking mode only)
     * @throws <other-error> on failure
     */
  /* [noscript] unsigned long read (in charPtr aBuf, in unsigned long aCount); */
  NS_IMETHOD Read(char * aBuf, PRUint32 aCount, PRUint32 *_retval) = 0;

  /**
     * Low-level read method that has access to the stream's underlying buffer.
     * The writer function may be called multiple times for segmented buffers.
     * ReadSegments is expected to keep calling the writer until either there is
     * nothing left to read or the writer returns an error.  ReadSegments should
     * not call the writer with zero bytes to consume.
     *
     * @param aWriter the "consumer" of the data to be read
     * @param aClosure opaque parameter passed to writer 
     * @param aCount the maximum number of bytes to be read
     *
     * @return number of bytes read (may be less than aCount)
     * @return 0 if reached end of file (or if aWriter refused to consume data)
     *
     * @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream would
     *   block the calling thread (non-blocking mode only)
     * @throws <other-error> on failure
     *
     * NOTE: this function may be unimplemented if a stream has no underlying
     * buffer (e.g., socket input stream).
     */
  /* [noscript] unsigned long readSegments (in nsWriteSegmentFun aWriter, in voidPtr aClosure, in unsigned long aCount); */
  NS_IMETHOD ReadSegments(nsWriteSegmentFun aWriter, void * aClosure, PRUint32 aCount, PRUint32 *_retval) = 0;

  /**
     * @return true if stream is non-blocking
     */
  /* boolean isNonBlocking (); */
  NS_IMETHOD IsNonBlocking(PRBool *_retval) = 0;

};

/* Use this macro when declaring classes that implement this interface. */
#define NS_DECL_NSIINPUTSTREAM \
  NS_IMETHOD Close(void); \
  NS_IMETHOD Available(PRUint32 *_retval); \
  NS_IMETHOD Read(char * aBuf, PRUint32 aCount, PRUint32 *_retval); \
  NS_IMETHOD ReadSegments(nsWriteSegmentFun aWriter, void * aClosure, PRUint32 aCount, PRUint32 *_retval); \
  NS_IMETHOD IsNonBlocking(PRBool *_retval); 

/* Use this macro to declare functions that forward the behavior of this interface to another object. */
#define NS_FORWARD_NSIINPUTSTREAM(_to) \
  NS_IMETHOD Close(void) { return _to Close(); } \
  NS_IMETHOD Available(PRUint32 *_retval) { return _to Available(_retval); } \
  NS_IMETHOD Read(char * aBuf, PRUint32 aCount, PRUint32 *_retval) { return _to Read(aBuf, aCount, _retval); } \
  NS_IMETHOD ReadSegments(nsWriteSegmentFun aWriter, void * aClosure, PRUint32 aCount, PRUint32 *_retval) { return _to ReadSegments(aWriter, aClosure, aCount, _retval); } \
  NS_IMETHOD IsNonBlocking(PRBool *_retval) { return _to IsNonBlocking(_retval); } 

/* Use this macro to declare functions that forward the behavior of this interface to another object in a safe way. */
#define NS_FORWARD_SAFE_NSIINPUTSTREAM(_to) \
  NS_IMETHOD Close(void) { return !_to ? NS_ERROR_NULL_POINTER : _to->Close(); } \
  NS_IMETHOD Available(PRUint32 *_retval) { return !_to ? NS_ERROR_NULL_POINTER : _to->Available(_retval); } \
  NS_IMETHOD Read(char * aBuf, PRUint32 aCount, PRUint32 *_retval) { return !_to ? NS_ERROR_NULL_POINTER : _to->Read(aBuf, aCount, _retval); } \
  NS_IMETHOD ReadSegments(nsWriteSegmentFun aWriter, void * aClosure, PRUint32 aCount, PRUint32 *_retval) { return !_to ? NS_ERROR_NULL_POINTER : _to->ReadSegments(aWriter, aClosure, aCount, _retval); } \
  NS_IMETHOD IsNonBlocking(PRBool *_retval) { return !_to ? NS_ERROR_NULL_POINTER : _to->IsNonBlocking(_retval); } 

#if 0
/* Use the code below as a template for the implementation class for this interface. */

/* Header file */
class nsInputStream : public nsIInputStream
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIINPUTSTREAM

  nsInputStream();
  virtual ~nsInputStream();
  /* additional members */
};

/* Implementation file */
NS_IMPL_ISUPPORTS1(nsInputStream, nsIInputStream)

nsInputStream::nsInputStream()
{
  /* member initializers and constructor code */
}

nsInputStream::~nsInputStream()
{
  /* destructor code */
}

/* void close (); */
NS_IMETHODIMP nsInputStream::Close()
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* unsigned long available (); */
NS_IMETHODIMP nsInputStream::Available(PRUint32 *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* [noscript] unsigned long read (in charPtr aBuf, in unsigned long aCount); */
NS_IMETHODIMP nsInputStream::Read(char * aBuf, PRUint32 aCount, PRUint32 *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* [noscript] unsigned long readSegments (in nsWriteSegmentFun aWriter, in voidPtr aClosure, in unsigned long aCount); */
NS_IMETHODIMP nsInputStream::ReadSegments(nsWriteSegmentFun aWriter, void * aClosure, PRUint32 aCount, PRUint32 *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* boolean isNonBlocking (); */
NS_IMETHODIMP nsInputStream::IsNonBlocking(PRBool *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* End of implementation class template. */
#endif


#endif /* __gen_nsIInputStream_h__ */
