/* -*- 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: Theis 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: Theis 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 knowlege 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 "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; #ifdef ENABLE_SMIME class nsICMSMessage; #endif // ENABLE_SMIME /* (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 partsToStrip; /* if we're stripping parts, what parts to strip */ nsTArray 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 ("

", "", etc.) This information is used when making the decision of whether a separating

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_ */