зеркало из https://github.com/mozilla/gecko-dev.git
203 строки
7.9 KiB
C
203 строки
7.9 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* mimeobj.h --- definition of the MimeObject class (see mimei.h)
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Created: Jamie Zawinski <jwz@netscape.com>, 15-May-96.
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*/
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#ifndef _MIMEOBJ_H_
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#define _MIMEOBJ_H_
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#include "mimei.h"
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#include "xp_linebuf.h"
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/* MimeObject is the base-class for the objects representing all other
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MIME types. It provides several methods:
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int initialize (MimeObject *obj)
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This is called from mime_new() when a new instance is allocated.
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Subclasses should do whatever setup is necessary from this method,
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and should call the superclass's initialize method, unless there's
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a specific reason not to.
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void finalize (MimeObject *obj)
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This is called from mime_free() and should free all data associated
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with the object. If the object points to other MIME objects, they
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should be finalized as well (by calling mime_free(), not by calling
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their finalize() methods directly.)
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int parse_buffer (char *buf, int32 size, MimeObject *obj)
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This is the method by which you feed arbitrary data into the parser
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for this object. Most subclasses will probably inherit this method
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from the MimeObject base-class, which line-buffers the data and then
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hands it off to the parse_line() method.
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If this object uses a Content-Transfer-Encoding (base64, qp, uue)
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then the data may be decoded by parse_buffer() before parse_line()
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is called. (The MimeLeaf class provides this functionality.)
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int parse_begin (MimeObject *obj)
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Called after `init' but before `parse_line' or `parse_buffer'.
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Can be used to initialize various parsing machinery.
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int parse_line (char *line, int32 length, MimeObject *obj)
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This method is called (by parse_buffer()) for each complete line of
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data handed to the parser, and is the method which most subclasses
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will override to implement their parsers.
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When handing data off to a MIME object for parsing, one should always
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call the parse_buffer() method, and not call the parse_line() method
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directly, since the parse_buffer() method may do other transformations
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on the data (like base64 decoding.)
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One should generally not call parse_line() directly, since that could
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bypass decoding. One should call parse_buffer() instead.
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int parse_eof (MimeObject *obj, XP_Bool abort_p)
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This is called when there is no more data to be handed to the object:
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when the parent object is done feeding data to an object being parsed.
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Implementors of this method should be sure to also call the parse_eof()
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methods of any sub-objects to which they have pointers.
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This is also called by the finalize() method, just before object
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destruction, if it has not already been called.
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The `closed_p' instance variable is used to prevent multiple calls to
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`parse_eof'.
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int parse_end (MimeObject *obj)
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Called after `parse_eof' but before `finalize'.
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This can be used to free up any memory no longer needed now that parsing
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is done (to avoid surprises due to unexpected method combination, it's
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best to free things in this method in preference to `parse_eof'.)
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Implementors of this method should be sure to also call the parse_end()
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methods of any sub-objects to which they have pointers.
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This is also called by the finalize() method, just before object
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destruction, if it has not already been called.
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The `parsed_p' instance variable is used to prevent multiple calls to
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`parse_end'.
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XP_Bool displayable_inline_p (MimeObjectClass *class, MimeHeaders *hdrs)
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This method should return true if this class of object will be displayed
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directly, as opposed to being displayed as a link. This information is
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used by the "multipart/alternative" parser to decide which of its children
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is the ``best'' one to display. Note that this is a class method, not
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an object method -- there is not yet an instance of this class at the time
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that it is called. The `hdrs' provided are the headers of the object that
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might be instantiated -- from this, the method may extract additional
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infomation that it might need to make its decision.
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*/
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/* this one is typdedef'ed in mimei.h, since it is the base-class. */
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struct MimeObjectClass {
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/* Note: the order of these first five slots is known by MimeDefClass().
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Technically, these are part of the object system, not the MIME code.
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*/
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const char *class_name;
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int instance_size;
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struct MimeObjectClass *superclass;
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int (*class_initialize) (MimeObjectClass *class);
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XP_Bool class_initialized;
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XP_Bool showAttachmentIcon;
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/* These are the methods shared by all MIME objects. See comment above.
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*/
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int (*initialize) (MimeObject *obj);
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void (*finalize) (MimeObject *obj);
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int (*parse_begin) (MimeObject *obj);
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int (*parse_buffer) (char *buf, int32 size, MimeObject *obj);
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int (*parse_line) (char *line, int32 length, MimeObject *obj);
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int (*parse_eof) (MimeObject *obj, XP_Bool abort_p);
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int (*parse_end) (MimeObject *obj, XP_Bool abort_p);
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XP_Bool (*displayable_inline_p) (MimeObjectClass *class, MimeHeaders *hdrs);
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#if defined(DEBUG) && defined(XP_UNIX)
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int (*debug_print) (MimeObject *obj, FILE *stream, int32 depth);
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#endif
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};
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extern MimeObjectClass mimeObjectClass;
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/* this one is typdedef'ed in mimei.h, since it is the base-class. */
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struct MimeObject {
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MimeObjectClass *class; /* Pointer to class object, for `type-of' */
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MimeHeaders *headers; /* The header data associated with this object;
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this is where the content-type, disposition,
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description, and other meta-data live.
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For example, the outermost message/rfc822 object
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would have NULL here (since it has no parent,
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thus no headers to describe it.) However, a
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multipart/mixed object, which was the sole
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child of that message/rfc822 object, would have
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here a copy of the headers which began the
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parent object (the headers which describe the
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child.)
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*/
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char *content_type; /* The MIME content-type and encoding. */
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char *encoding; /* In most cases, these will be the same as the
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values to be found in the `headers' object,
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but in some cases, the values in these slots
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will be more correct than the headers.
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*/
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MimeObject *parent; /* Backpointer to a MimeContainer object. */
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MimeDisplayOptions *options; /* Display preferences set by caller. */
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XP_Bool closed_p; /* Whether it's done being written to. */
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XP_Bool parsed_p; /* Whether the parser has been shut down. */
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XP_Bool output_p; /* Whether it should be written. */
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/* Read-buffer and write-buffer (on input, `parse_buffer' uses ibuffer to
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compose calls to `parse_line'; on output, `obuffer' is used in various
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ways by various routines.) These buffers are created and grow as needed.
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`ibuffer' should be generally be considered hands-off, and `obuffer'
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should generally be considered fair game.
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*/
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char *ibuffer, *obuffer;
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uint32 ibuffer_size, obuffer_size;
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uint32 ibuffer_fp, obuffer_fp;
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};
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#define MimeObject_grow_obuffer(obj, desired_size) \
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(((desired_size) >= (obj)->obuffer_size) ? \
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XP_GrowBuffer ((desired_size), sizeof(char), 1024, \
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&(obj)->obuffer, &(obj)->obuffer_size) \
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: 0)
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#endif /* _MIMEOBJ_H_ */
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