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87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/* mimepbuf.h --- utilities for buffering a MIME part for later display.
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Created: Jamie Zawinski <jwz@netscape.com>, 24-Sep-96.
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*/
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#ifndef _MIMEPBUF_H_
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#define _MIMEPBUF_H_
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#include "mimei.h"
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/* This file provides the ability to save up the entire contents of a MIME
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object (of arbitrary size), and then emit it all at once later. The
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buffering is done in an efficient way that works well for both very large
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and very small objects.
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This is used in two places:
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= The implementation of multipart/alternative uses this code to do a
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one-part-lookahead. As it traverses its children, it moves forward
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until it finds a part which cannot be displayed; and then it displays
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the *previous* part (the last which *could* be displayed.) This code
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is used to hold the previous part until it is needed.
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*/
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HG89321
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/* An opaque object used to represent the buffered data.
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*/
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typedef struct MimePartBufferData MimePartBufferData;
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/* Create an empty part buffer object.
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*/
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extern MimePartBufferData *MimePartBufferCreate (void);
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/* Assert that the buffer is now full (EOF has been reached on the current
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part.) This will free some resources, but leaves the part in the buffer.
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After calling MimePartBufferReset, the buffer may be used to store a
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different object.
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*/
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void MimePartBufferClose (MimePartBufferData *data);
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/* Reset a part buffer object to the default state, discarding any currently-
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buffered data.
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*/
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extern void MimePartBufferReset (MimePartBufferData *data);
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/* Free the part buffer itself, and discard any buffered data.
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*/
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extern void MimePartBufferDestroy (MimePartBufferData *data);
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/* Push a chunk of a MIME object into the buffer.
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*/
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extern int MimePartBufferWrite (MimePartBufferData *data,
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const char *buf, int32 size);
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/* Read the contents of the buffer back out. This will invoke the provided
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read_fn with successive chunks of data until the buffer has been drained.
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The provided function may be called once, or multiple times.
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*/
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extern int
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MimePartBufferRead (MimePartBufferData *data,
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int (*read_fn) (char *buf, int32 size, void *closure),
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void *closure);
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#endif /* _MIMEPBUF_H_ */
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