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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /comm/mailnews/mime/src/mimei.h
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
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Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _MIMEI_H_
+#define _MIMEI_H_
+
+/*
+ This module, libmime, implements a general-purpose MIME parser.
+ One of the methods provided by this parser is the ability to emit
+ an HTML representation of it.
+
+ All Mozilla-specific code is (and should remain) isolated in the
+ file mimemoz.c. Generally, if the code involves images, netlib
+ streams it should be in mimemoz.c instead of in the main body of
+ the MIME parser.
+
+ The parser is object-oriented and fully buzzword-compliant.
+ There is a class for each MIME type, and each class is responsible
+ for parsing itself, and/or handing the input data off to one of its
+ child objects.
+
+ The class hierarchy is:
+
+ MimeObject (abstract)
+ |
+ +--- MimeContainer (abstract)
+ | |
+ | +--- MimeMultipart (abstract)
+ | | |
+ | | +--- MimeMultipartMixed
+ | | |
+ | | +--- MimeMultipartDigest
+ | | |
+ | | +--- MimeMultipartParallel
+ | | |
+ | | +--- MimeMultipartAlternative
+ | | |
+ | | +--- MimeMultipartRelated
+ | | |
+ | | +--- MimeMultipartAppleDouble
+ | | |
+ | | +--- MimeSunAttachment
+ | | |
+ | | \--- MimeMultipartSigned (abstract)
+ | | |
+ | | \--- MimeMultipartSignedCMS
+ | |
+ | +--- MimeEncrypted (abstract)
+ | | |
+ | | \--- MimeEncryptedPKCS7
+ | |
+ | +--- MimeXlateed (abstract)
+ | | |
+ | | \--- MimeXlateed
+ | |
+ | +--- MimeMessage
+ | |
+ | \--- MimeUntypedText
+ |
+ +--- MimeLeaf (abstract)
+ | |
+ | +--- MimeInlineText (abstract)
+ | | |
+ | | +--- MimeInlineTextPlain
+ | | | |
+ | | | \--- MimeInlineTextHTMLAsPlaintext
+ | | |
+ | | +--- MimeInlineTextPlainFlowed
+ | | |
+ | | +--- MimeInlineTextHTML
+ | | | |
+ | | | +--- MimeInlineTextHTMLParsed
+ | | | |
+ | | | \--- MimeInlineTextHTMLSanitized
+ | | |
+ | | +--- MimeInlineTextRichtext
+ | | | |
+ | | | \--- MimeInlineTextEnriched
+ | | |
+ | | +--- MimeInlineTextVCard
+ | |
+ | +--- MimeInlineImage
+ | |
+ | \--- MimeExternalObject
+ |
+ \--- MimeExternalBody
+
+
+ =========================================================================
+ The definition of these classes is somewhat idiosyncratic, since I defined
+ my own small object system, instead of giving the C++ virus another foothold.
+ (I would have liked to have written this in Java, but our runtime isn't
+ quite ready for prime time yet.)
+
+ There is one header file and one source file for each class (for example,
+ the MimeInlineText class is defined in "mimetext.h" and "mimetext.c".)
+ Each header file follows the following boiler-plate form:
+
+ TYPEDEFS: these come first to avoid circular dependencies.
+
+ typedef struct FoobarClass FoobarClass;
+ typedef struct Foobar Foobar;
+
+ CLASS DECLARATION:
+ This structure defines the callback routines and other per-class data
+ of the class defined in this module.
+
+ struct FoobarClass {
+ ParentClass superclass;
+ ...any callbacks or class-variables...
+ };
+
+ CLASS DEFINITION:
+ This variable holds an instance of the one-and-only class record; the
+ various instances of this class point to this object. (One interrogates
+ the type of an instance by comparing the value of its class pointer with
+ the address of this variable.)
+
+ extern FoobarClass foobarClass;
+
+ INSTANCE DECLARATION:
+ This structure defines the per-instance data of an object, and a pointer
+ to the corresponding class record.
+
+ struct Foobar {
+ Parent parent;
+ ...any instance variables...
+ };
+
+ Then, in the corresponding .c file, the following structure is used:
+
+ CLASS DEFINITION:
+ First we pull in the appropriate include file (which includes all necessary
+ include files for the parent classes) and then we define the class object
+ using the MimeDefClass macro:
+
+ #include "foobar.h"
+ #define MIME_SUPERCLASS parentlClass
+ MimeDefClass(Foobar, FoobarClass, foobarClass, &MIME_SUPERCLASS);
+
+ The definition of MIME_SUPERCLASS is just to move most of the knowledge of the
+ exact class hierarchy up to the file's header, instead of it being scattered
+ through the various methods; see below.
+
+ METHOD DECLARATIONS:
+ We will be putting function pointers into the class object, so we declare
+ them here. They can generally all be static, since nobody outside of this
+ file needs to reference them by name; all references to these routines should
+ be through the class object.
+
+ extern int FoobarMethod(Foobar *);
+ ...etc...
+
+ CLASS INITIALIZATION FUNCTION:
+ The MimeDefClass macro expects us to define a function which will finish up
+ any initialization of the class object that needs to happen before the first
+ time it is instantiated. Its name must be of the form "<class>Initialize",
+ and it should initialize the various method slots in the class as
+ appropriate. Any methods or class variables which this class does not wish
+ to override will be automatically inherited from the parent class (by virtue
+ of its class-initialization function having been run first.) Each class
+ object will only be initialized once.
+
+ static int
+ FoobarClassInitialize(FoobarClass *class)
+ {
+ clazz->method = FoobarMethod.
+ ...etc...
+ }
+
+ METHOD DEFINITIONS:
+ Next come the definitions of the methods we referred to in the class-init
+ function. The way to access earlier methods (methods defined on the
+ superclass) is to simply extract them from the superclass's object.
+ But note that you CANNOT get at methods by indirecting through
+ object->clazz->superclass: that will only work to one level, and will
+ go into a loop if some subclass tries to continue on this method.
+
+ The easiest way to do this is to make use of the MIME_SUPERCLASS macro that
+ was defined at the top of the file, as shown below. The alternative to that
+ involves typing the literal name of the direct superclass of the class
+ defined in this file, which will be a maintenance headache if the class
+ hierarchy changes. If you use the MIME_SUPERCLASS idiom, then a textual
+ change is required in only one place if this class's superclass changes.
+
+ static void
+ Foobar_finalize (MimeObject *object)
+ {
+ ((MimeObjectClass*)&MIME_SUPERCLASS)->finalize(object); // RIGHT
+ parentClass.whatnot.object.finalize(object); // (works...)
+ object->clazz->superclass->finalize(object); // WRONG!!
+ }
+
+ If you write a libmime content type handler, libmime might create several
+ instances of your class at once and call e.g. the same finalize code for
+ 3 different objects in a row.
+ */
+
+#include "mimehdrs.h"
+#include "nsTArray.h"
+
+typedef struct MimeObject MimeObject;
+typedef struct MimeObjectClass MimeObjectClass;
+
+/* (I don't pretend to understand this.) */
+#define cpp_stringify_noop_helper(x) #x
+#define cpp_stringify(x) cpp_stringify_noop_helper(x)
+
+#define MimeObjectClassInitializer(ITYPE, CSUPER) \
+ cpp_stringify(ITYPE), sizeof(ITYPE), (MimeObjectClass*)CSUPER, \
+ (int (*)(MimeObjectClass*))ITYPE##ClassInitialize, 0
+
+/* Macro used for setting up class definitions.
+ */
+#define MimeDefClass(ITYPE, CTYPE, CVAR, CSUPER) \
+ static int ITYPE##ClassInitialize(ITYPE##Class*); \
+ ITYPE##Class CVAR = {ITYPE##ClassInitializer(ITYPE, CSUPER)}
+
+/* Creates a new (subclass of) MimeObject of the given class, with the
+ given headers (which are copied.)
+ */
+extern MimeObject* mime_new(MimeObjectClass* clazz, MimeHeaders* hdrs,
+ const char* override_content_type);
+
+/* Destroys a MimeObject (or subclass) and all data associated with it.
+ */
+extern "C" void mime_free(MimeObject* object);
+
+/* Given a content-type string, finds and returns an appropriate subclass
+ of MimeObject. A class object is returned. If `exact_match_p' is true,
+ then only fully-known types will be returned; that is, if it is true,
+ then "text/x-unknown" will return MimeInlineTextPlainType, but if it is
+ false, it will return NULL.
+ */
+extern MimeObjectClass* mime_find_class(const char* content_type,
+ MimeHeaders* hdrs,
+ MimeDisplayOptions* opts,
+ bool exact_match_p);
+
+/** Given a content-type string, creates and returns an appropriate subclass
+ * of MimeObject. The headers (from which the content-type was presumably
+ * extracted) are copied. forceInline is set to true when the caller wants
+ * the function to ignore opts->show_attachment_inline_p and force inline
+ * display, e.g., mimemalt wants the body part to be shown inline.
+ */
+extern MimeObject* mime_create(const char* content_type, MimeHeaders* hdrs,
+ MimeDisplayOptions* opts,
+ bool forceInline = false);
+
+/* Querying the type hierarchy */
+extern bool mime_subclass_p(MimeObjectClass* child, MimeObjectClass* parent);
+extern bool mime_typep(MimeObject* obj, MimeObjectClass* clazz);
+
+/* Returns a string describing the location of the part (like "2.5.3").
+ This is not a full URL, just a part-number.
+ */
+extern char* mime_part_address(MimeObject* obj);
+
+/* Returns a string describing the location of the *IMAP* part (like "2.5.3").
+ This is not a full URL, just a part-number.
+ This part is explicitly passed in the X-Mozilla-IMAP-Part header.
+ Return value must be freed by the caller.
+ */
+extern char* mime_imap_part_address(MimeObject* obj);
+
+extern char* mime_external_attachment_url(MimeObject* obj);
+
+/* Puts a part-number into a URL. If append_p is true, then the part number
+ is appended to any existing part-number already in that URL; otherwise,
+ it replaces it.
+ */
+extern char* mime_set_url_part(const char* url, const char* part,
+ bool append_p);
+
+/*
+ cut the part of url for display a attachment as a email.
+*/
+extern char* mime_get_base_url(const char* url);
+
+/* Puts an *IMAP* part-number into a URL.
+ */
+extern char* mime_set_url_imap_part(const char* url, const char* part,
+ const char* libmimepart);
+
+/* Given a part ID, looks through the MimeObject tree for a sub-part whose ID
+ number matches, and returns the MimeObject (else NULL.)
+ (part is not a URL -- it's of the form "1.3.5".)
+ */
+extern MimeObject* mime_address_to_part(const char* part, MimeObject* obj);
+
+/* Given a part ID, looks through the MimeObject tree for a sub-part whose ID
+ number matches; if one is found, returns the Content-Name of that part.
+ Else returns NULL. (part is not a URL -- it's of the form "1.3.5".)
+ */
+extern char* mime_find_suggested_name_of_part(const char* part,
+ MimeObject* obj);
+
+/* Given a part ID, looks through the MimeObject tree for a sub-part whose ID
+ number matches; if one is found, returns the Content-Name of that part.
+ Else returns NULL. (part is not a URL -- it's of the form "1.3.5".)
+ */
+extern char* mime_find_content_type_of_part(const char* part, MimeObject* obj);
+
+/* Parse the various "?" options off the URL and into the options struct.
+ */
+extern int mime_parse_url_options(const char* url, MimeDisplayOptions*);
+
+#ifdef ENABLE_SMIME
+
+/* Asks whether the given object is one of the cryptographically signed
+ or encrypted objects that we know about. (MimeMessageClass uses this
+ to decide if the headers need to be presented differently.)
+ */
+extern bool mime_crypto_object_p(MimeHeaders*, bool clearsigned_counts,
+ MimeDisplayOptions*);
+
+/* Tells whether the given MimeObject is a message which has been encrypted
+ or signed. (Helper for MIME_GetMessageCryptoState()).
+ */
+extern void mime_get_crypto_state(MimeObject* obj, bool* signed_p,
+ bool* encrypted_p, bool* signed_ok,
+ bool* encrypted_ok);
+
+/* How the crypto code tells the MimeMessage object what the crypto stamp
+ on it says. */
+extern void mime_set_crypto_stamp(MimeObject* obj, bool signed_p,
+ bool encrypted_p);
+#endif // ENABLE_SMIME
+
+class MimeParseStateObject {
+ public:
+ MimeParseStateObject() {
+ root = 0;
+ separator_queued_p = false;
+ separator_suppressed_p = false;
+ first_part_written_p = false;
+ post_header_html_run_p = false;
+ first_data_written_p = false;
+ strippingPart = false;
+ }
+ MimeObject* root; /* The outermost parser object. */
+
+ bool separator_queued_p; /* Whether a separator should be written out
+ before the next text is written (this lets
+ us write separators lazily, so that one
+ doesn't appear at the end, and so that more
+ than one don't appear in a row.) */
+
+ bool separator_suppressed_p; /* Whether the currently-queued separator
+ should not be printed; this is a kludge to
+ prevent seps from being printed just after
+ a header block... */
+
+ bool first_part_written_p; /* State used for the `Show Attachments As
+ Links' kludge. */
+
+ bool post_header_html_run_p; /* Whether we've run the
+ options->generate_post_header_html_fn */
+
+ bool first_data_written_p; /* State used for Mozilla lazy-stream-
+ creation evilness. */
+
+ nsTArray<nsCString>
+ partsToStrip; /* if we're stripping parts, what parts to strip */
+ nsTArray<nsCString> detachToFiles; /* if we're detaching parts, where each
+ part was detached to */
+ bool strippingPart;
+ nsCString detachedFilePath; /* if we've detached this part, filepath of
+ detached part */
+};
+
+/* Some output-generation utility functions...
+ */
+extern int MimeObject_output_init(MimeObject* obj, const char* content_type);
+
+/* The `user_visible_p' argument says whether the output that has just been
+ written will cause characters or images to show up on the screen, that
+ is, it should be false if the stuff being written is merely structural
+ HTML or whitespace ("<P>", "</TABLE>", etc.) This information is used
+ when making the decision of whether a separating <HR> is needed.
+ */
+extern int MimeObject_write(MimeObject*, const char* data, int32_t length,
+ bool user_visible_p);
+extern int MimeOptions_write(MimeHeaders*, MimeDisplayOptions*,
+ const char* data, int32_t length,
+ bool user_visible_p);
+
+/* Writes out the right kind of HR (or rather, queues it for writing.) */
+extern int MimeObject_write_separator(MimeObject*);
+
+extern bool MimeObjectIsMessageBody(MimeObject* obj);
+
+struct MimeDisplayData { /* This struct is what we hang off of
+ (context)->mime_data, to remember info
+ about the last MIME object we've
+ parsed and displayed. See
+ MimeGuessURLContentName() below.
+ */
+ MimeObject* last_parsed_object;
+ char* last_parsed_url;
+};
+
+#endif /* _MIMEI_H_ */