path: root/plugins/mono/Camel.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Runtime.InteropServices;

namespace Camel {
    [StructLayout (LayoutKind.Sequential)]
    public struct CamelException {
        public int id;
        public string desc;
    }

    public class Arg {
        public enum Tag : uint {
            END = 0,
            IGNORE = 1,
            FIRST = 1024,

            TYPE = 0xf0000000, /* type field for tags */
            TAG = 0x0fffffff, /* tag field for args */

            OBJ = 0x00000000, /* object */
            INT = 0x10000000, /* int */
            DBL = 0x20000000, /* double */
            STR = 0x30000000, /* c string */
            PTR = 0x40000000, /* ptr */
            BOO = 0x50000000 /* bool */
        }
    }

    public class Exception : System.ApplicationException {
        public enum Type {
            NONE = 0,
            SYSTEM = 1
        }

        public Type id;
        public string desc;

        public Exception(CamelException ex) {
            id = (Type)ex.id;
            desc = ex.desc;
        }

        public Exception(Type _id, string _desc) {
            id = _id;
            desc = _desc;
        }
    }

    public class Util {
        [DllImport("camel-1.2")] static extern int camel_init(string certdir, bool nss);

        public static void Init(string certdir, bool nss) {
            if (camel_init(certdir, nss) != 0)
                throw new Exception(Exception.Type.SYSTEM, "Init failure");
        }

        public static string [] getUIDArray(IntPtr o) {
            GPtrArray pa = (GPtrArray)Marshal.PtrToStructure(o, typeof(GPtrArray));
            string [] uids = new string[pa.len];

            for (int i=0;i<pa.len;i++) {
                IntPtr x = Marshal.ReadIntPtr(pa.pdata, i * Marshal.SizeOf(typeof(IntPtr)));
                uids[i] = Marshal.PtrToStringAuto(x);
            }

            return uids;
        }
/*
        public static IntPtr setUIDs(string [] uids) {
            
        }
*/
        public struct UIDArray {
            public string [] uids;
            public int len;

            public UIDArray(string [] _uids) {
                uids = _uids;
                len = _uids.Length;
            }
            
            public UIDArray(IntPtr raw) {
                uids = new string[0];
                len = 0;
                Marshal.PtrToStructure(raw, this);
            }
        }
    }

    public class Object {
        // should be library scope
        public IntPtr cobject;
        private int finaliseID = -1;

        protected EventHandlerList events = new EventHandlerList();

        // reffing & wrapping stuff.
        struct CamelObject {
            public IntPtr klass;
        }

        struct CamelObjectClass {
            public IntPtr parent;
            int magic;
            IntPtr next;
            IntPtr prev;
            public string name;
        };

        private static Hashtable types = new Hashtable();
        private static Hashtable objects = new Hashtable();

        [DllImport("camel-1.2")] static extern void camel_object_ref(IntPtr raw);
        [DllImport("camel-1.2")] static extern void camel_object_unref(IntPtr raw);

        public Object(IntPtr raw) {
            // ok this is a hack around c# crap to do with unargumented constructors.
            // we can bypass to a null raw so we can properly instantiate new types
            if (raw != (IntPtr)0) {
                cobject = raw;
                toCamel(this);
            }
        }

        public Object() {
            // this is invalid?
        }

        ~Object() {
            System.Console.WriteLine("object disposed " + cobject + " type " + this);

            // well we can never get a finalised event anyway ...
            if (finalise_id != -1)
                camel_object_remove_event(cobject, finalise_id);
            if (meta_changed_id != -1)
                camel_object_remove_event(cobject, meta_changed_id);

            objects.Remove(cobject);
            camel_object_remove_event(cobject, finaliseID);
            finaliseID = -1;
            camel_object_unref(cobject);
            cobject = (IntPtr)0;

            // FIXME: remove any event hooks too
        }

        static Object() {
            types.Add("CamelObject", typeof(Camel.Object));
            types.Add("CamelSession", typeof(Camel.Session));
            types.Add("CamelFolder", typeof(Camel.Folder));
            types.Add("CamelDataWrapper", typeof(Camel.DataWrapper));
            types.Add("CamelMedium", typeof(Camel.Medium));
            types.Add("CamelMimeMessage", typeof(Camel.MimeMessage));
            types.Add("CamelMimePart", typeof(Camel.MimePart));
            types.Add("CamelMultipart", typeof(Camel.Multipart));

            types.Add("CamelStore", typeof(Camel.Store));
            types.Add("CamelTransport", typeof(Camel.Transport));
            types.Add("CamelAddress", typeof(Camel.Address));
            types.Add("CamelInternetAddress", typeof(Camel.InternetAddress));
            types.Add("CamelStream", typeof(Camel.Stream));
            types.Add("CamelStreamMem", typeof(Camel.StreamMem));
            types.Add("CamelStreamFs", typeof(Camel.StreamFS));
        }

        public static void objectFinalised(IntPtr o, IntPtr info, IntPtr data) {
            System.Console.WriteLine("object finalised " + o);
            objects.Remove(o);
        }

        public static Object fromCamel(IntPtr raw) {
            CamelObject o;
            CamelObjectClass klass;
            WeakReference weak = (WeakReference)objects[raw];

            System.Console.WriteLine("object from camel " + raw);

            if (weak != null)
                return (Object)weak.Target;

            o = (CamelObject)Marshal.PtrToStructure(raw, typeof(CamelObject));
            if ((object)o == null)
                return null;

            klass = (CamelObjectClass)Marshal.PtrToStructure(o.klass, typeof(CamelObjectClass));
            while ((object)klass != null) {
                Console.WriteLine(" checking is " + klass.name);
                if (types.ContainsKey(klass.name)) {
                    Console.WriteLine("  yep!");
                    camel_object_ref(raw);
                    return (Camel.Object)Activator.CreateInstance((Type)types[klass.name], new object [] { raw });
                }

                klass = (CamelObjectClass)Marshal.PtrToStructure(klass.parent, typeof(CamelObjectClass));
            }

            Console.WriteLine("  unknown type?");
            camel_object_unref(raw);
            return null;
        }

        /* this just registers an object created on the cil side */
        public static void toCamel(Object res) {
            System.Console.WriteLine("object to camel " + res.cobject);

            objects.Add(res.cobject, new WeakReference(res));
            res.finaliseID = camel_object_hook_event(res.cobject, "finalize", (CamelEventFunc)objectFinalised, (IntPtr)0);
        }

        // Camel event Wrapper and helpers
        public delegate void CamelEventFunc(IntPtr o, IntPtr info, IntPtr data);

        [DllImport("camel-1.2")] public static extern int camel_object_hook_event(IntPtr raw, string name, CamelEventFunc func, IntPtr data);
        [DllImport("camel-1.2")] public static extern void camel_object_remove_event(IntPtr raw, int id);

        protected void addEvent(String name, ref int hookid, CamelEventFunc hook, Delegate value) {
            if (hookid == -1)
                hookid = camel_object_hook_event(cobject, name, hook, (IntPtr)0);
            events.AddHandler(name, value);
        }

        protected void removeEvent(String name, ref int hookid, Delegate value) {
            events.RemoveHandler(name, value);
            if (events[name] == null) {
                camel_object_remove_event(cobject, hookid);
                hookid = -1;
            }
        }   

        // object events
        public delegate void FinaliseEvent(Camel.Object o);
        public delegate void MetaChangedEvent(Camel.Object o, String name);

        // how to remove these, at dispose time?
        private int finalise_id = -1;
        private int meta_changed_id = -1;

        private static void finaliseHook(IntPtr co, IntPtr info, IntPtr data) {
            Object o = fromCamel(co);
            FinaliseEvent f;

            if (o != null
                && (f = (FinaliseEvent)o.events["finalize"]) != null)
                f(o);
        }

        private static void metaChangedHook(IntPtr co, IntPtr info, IntPtr data) {
            Object o = fromCamel(co);
            MetaChangedEvent f;

            if (o != null
                && (f = (MetaChangedEvent)o.events["finalize"]) != null)
                f(o, Marshal.PtrToStringAnsi(info));
        }

        public event FinaliseEvent Finalise {
            add { addEvent("finalize", ref finalise_id, (CamelEventFunc)finaliseHook, value); }
            remove { removeEvent("finalize", ref finalise_id, value); }
        }

        public event MetaChangedEvent MetaChanged {
            add { addEvent("meta_changed", ref meta_changed_id, (CamelEventFunc)metaChangedHook, value); }
            remove { removeEvent("meta_changed", ref meta_changed_id, value); }
        }

        [DllImport("camel-1.2")] static extern IntPtr camel_object_get_ptr(IntPtr raw, ref CamelException ex, int tag);
        [DllImport("camel-1.2")] static extern void camel_object_free(IntPtr raw, int tag, IntPtr val);
        [DllImport("camel-1.2")] static extern int camel_object_get_int(IntPtr raw, ref CamelException ex, int tag);

        // maybe we want an indexer class to get properties?
        // e.g. name = folder.properties[Folder.Tag.NAME]
        public String getString(int type) {
            String s;
            IntPtr o;
            CamelException ex = new CamelException();

            o = camel_object_get_ptr(cobject, ref ex, type);
            if (ex.id != 0)
                throw new Camel.Exception(ex);

            s = Marshal.PtrToStringAuto(o);
            camel_object_free(cobject, type, o);

            return s;
        }

        public Camel.Object getObject(int type) {
            IntPtr o;
            Camel.Object co;
            CamelException ex = new CamelException();

            o = camel_object_get_ptr(cobject, ref ex, type);
            if (ex.id != 0)
                throw new Camel.Exception(ex);

            co = fromCamel(o);
            camel_object_free(cobject, type, o);

            return co;
        }

        public int getInt(int type) {
            int r;
            CamelException ex = new CamelException();

            r = camel_object_get_int(cobject, ref ex, type);
            if (ex.id != 0)
                throw new Camel.Exception(ex);

            return r;
        }

        // meta-data
        [DllImport("camel-1.2")] static extern String camel_object_meta_get(IntPtr raw, string name);
        [DllImport("camel-1.2")] static extern bool camel_object_meta_set(IntPtr raw, string name, string value);

        public String metaGet(String name) {
            return camel_object_meta_get(cobject, name);
        }

        public bool metaSet(String name, String value) {
            return camel_object_meta_set(cobject, name, value);
        }
    }

    public class Provider {
        public enum Type {
            STORE = 0,
            TRANSPORT = 1
        }
    }

    public class Session : Object {
        public Session(IntPtr raw) : base(raw) { }

        [DllImport("camel-provider-1.2")] static extern IntPtr camel_session_get_service(IntPtr o, string uri, int type, ref CamelException ex);
        [DllImport("camel-provider-1.2")] static extern IntPtr camel_session_get_service_connected(IntPtr o, string uri, int type, ref CamelException ex);

        public Service getService(string uri, Provider.Type type) {
            IntPtr s;
            CamelException ex = new CamelException();

            s = camel_session_get_service(cobject, uri, (int)type, ref ex);
            if (ex.id != 0)
                throw new Camel.Exception(ex);

            return (Service)fromCamel(s);
        }
    }

    public class Service : Object {
        public Service(IntPtr raw) : base(raw) { }
        // wrap service shit
    }

    public class Store : Service {
        public Store(IntPtr raw) : base(raw) { }

        [DllImport("camel-provider-1.2")]
                static extern IntPtr camel_store_get_folder(IntPtr o, string name, int flags, ref CamelException ex);

        Folder getFolder(string name, int flags) {
            IntPtr s;
            CamelException ex = new CamelException();

            s = camel_store_get_folder(cobject, name, flags, ref ex);
            if (ex.id != 0)
                throw new Camel.Exception(ex);

            return (Folder)fromCamel(s);
        }

        void createFolder(string name) {
        }
    }

    public class Transport : Service {
        public Transport(IntPtr raw) : base(raw) { }

        // send to (message, from, reciepients);
    }

    public class Folder : Camel.Object {
        public Folder(IntPtr raw) : base(raw) { }

        ~Folder() {
            if (changed_id != -1)
                camel_object_remove_event(cobject, changed_id);
        }

        public enum Tag {
            NAME = (int) (0x1400 + Arg.Tag.STR),
            FULL_NAME = (int) (0x1401 + Arg.Tag.STR),
            STORE = (int) (0x1402 + Arg.Tag.OBJ),
            PERMANENTFLAGS = (int) (0x1403 + Arg.Tag.INT),
            TOTAL = (int) (0x1404 + Arg.Tag.INT),
            UNREAD = (int) (0x1405 + Arg.Tag.INT),
            DELETED = (int) (0x1406 + Arg.Tag.INT),
            JUNKED = (int) (0x1407 + Arg.Tag.INT),
            VISIBLE = (int) (0x1408 + Arg.Tag.INT),
            UID_ARRAY = (int) (0x1409 + Arg.Tag.PTR),
            INFO_ARRAY = (int) (0x140a + Arg.Tag.PTR), // GPtrArray
            PROPERTIES = (int) (0x140b + Arg.Tag.PTR), // GSList of properties
        }

        [DllImport("camel-provider-1.2")] static extern IntPtr camel_folder_get_message(IntPtr o, string uid, ref CamelException ex);
        [DllImport("camel-provider-1.2")] static extern IntPtr camel_folder_get_uids(IntPtr o);
        [DllImport("camel-provider-1.2")] static extern void camel_folder_free_uids(IntPtr o, IntPtr uids);
        [DllImport("camel-provider-1.2")] static extern IntPtr camel_folder_search_by_expression(IntPtr o, string expr, ref CamelException ex);
        [DllImport("camel-provider-1.2")] static extern IntPtr camel_folder_search_by_uids(IntPtr o, string expr, ref Util.UIDArray uids, ref CamelException ex);
        [DllImport("camel-provider-1.2")] static extern void camel_folder_search_free(IntPtr o, IntPtr uids);

        [DllImport("camel-provider-1.2")] static extern IntPtr camel_folder_get_message_info(IntPtr raw, String uid);

        public MimeMessage getMessage(string uid) {
            CamelException ex = new CamelException();
            IntPtr o = camel_folder_get_message(cobject, uid, ref ex);

            if (ex.id != 0)
                throw new Camel.Exception(ex);

            return (MimeMessage)fromCamel(o);
        }

        public MessageInfo getMessageInfo(string uid) {
            IntPtr o = camel_folder_get_message_info(cobject, uid);

            if (o == (IntPtr)0)
                return null;
            else
                return new MessageInfo(o);
        }

        public string [] getUIDs() {
            IntPtr o = camel_folder_get_uids(cobject);
            Util.UIDArray uids = new Util.UIDArray(o);

            camel_folder_free_uids(cobject, o);

            return uids.uids;
        }

        public string [] search(string expr) {
            CamelException ex = new CamelException();
            IntPtr o = camel_folder_search_by_expression(cobject, expr, ref ex);
            Util.UIDArray uids;

            if (ex.id != 0)
                throw new Camel.Exception(ex);

            uids = new Util.UIDArray(o);
            camel_folder_search_free(cobject, o);

            return uids.uids;
        }

        public string [] searchUIDs(string expr, string [] sub) {
            CamelException ex = new CamelException();
            Util.UIDArray uids = new Util.UIDArray(sub);
            IntPtr o = camel_folder_search_by_uids(cobject, expr, ref uids, ref ex);

            if (ex.id != 0)
                throw new Camel.Exception(ex);

            uids = new Util.UIDArray(o);
            camel_folder_search_free(cobject, o);

            return uids.uids;
        }

        public String name {
            get { return getString((int)Folder.Tag.NAME); }
        }

        public String fullName {
            get { return getString((int)Folder.Tag.FULL_NAME); }
        }

        public Camel.Store store {
            get { return (Camel.Store)getObject((int)Folder.Tag.STORE); }
        }

        // Folder events
        public delegate void ChangedEvent(Camel.Folder f);

        private int changed_id = -1;

        private static void changedHook(IntPtr co, IntPtr info, IntPtr data) {
            Camel.Folder o = (Camel.Folder)fromCamel(co);
            ChangedEvent f;
            
            Console.WriteLine("changed hook called for: " + o.cobject);

            if (o != null
                && (f = (ChangedEvent)o.events["folder_changed"]) != null)
                f(o);
        }

        public event ChangedEvent Changed {
            add { addEvent("folder_changed", ref changed_id, (CamelEventFunc)changedHook, value); }
            remove { removeEvent("folder_changed", ref changed_id, value); }
        }
    }

    public class DataWrapper : Camel.Object {
        public DataWrapper(IntPtr raw) : base(raw) { }

        [DllImport("camel-1.2")] static extern int camel_data_wrapper_write_to_stream(IntPtr o, IntPtr s);
        [DllImport("camel-1.2")] static extern int camel_data_wrapper_decode_to_stream(IntPtr o, IntPtr s);
        [DllImport("camel-1.2")] static extern int camel_data_wrapper_construct_from_stream(IntPtr o, IntPtr s);
        [DllImport("camel-1.2")] static extern IntPtr camel_data_wrapper_get_mime_type_field(IntPtr o);

        public void writeToStream(Camel.Stream stream) {
            int res;

            res = camel_data_wrapper_write_to_stream(cobject, stream.cobject);
            if (res == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO Error");
        }

        public void decodeToStream(Camel.Stream stream) {
            int res;

            res = camel_data_wrapper_decode_to_stream(cobject, stream.cobject);
            if (res == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO Error");
        }

        public void constructFromStream(Camel.Stream stream) {
            int res;

            res = camel_data_wrapper_construct_from_stream(cobject, stream.cobject);
            if (res == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO Error");
        }

        public ContentType mimeType { get { return new ContentType(camel_data_wrapper_get_mime_type_field(cobject)); } }
    }

    public class Medium : Camel.DataWrapper {
        public Medium(IntPtr raw) : base(raw) { }

        [DllImport("camel-1.2")] static extern IntPtr camel_medium_get_content_object(IntPtr o);
        [DllImport("camel-1.2")] static extern void camel_medium_set_content_object(IntPtr o, IntPtr s);

        public DataWrapper content {
            get {
                IntPtr o = camel_medium_get_content_object(cobject);

                if (o != (IntPtr)0)
                    return (DataWrapper)Object.fromCamel(o);
                else
                    return null;
            }
            set {
                camel_medium_set_content_object(cobject, value.cobject);
            }
        }
    }

    public class Multipart : Camel.DataWrapper {
        [DllImport("camel-1.2")] static extern IntPtr camel_multipart_new();
        [DllImport("camel-1.2")] static extern void camel_multipart_add_part(IntPtr o, IntPtr p);
        [DllImport("camel-1.2")] static extern void camel_multipart_remove_part(IntPtr o, IntPtr p);
        [DllImport("camel-1.2")] static extern IntPtr camel_multipart_get_part(IntPtr o, int index);
        [DllImport("camel-1.2")] static extern int camel_multipart_get_number(IntPtr o);

        public Multipart(IntPtr raw) : base(raw) { }

        public void addPart(MimePart part) {
            camel_multipart_add_part(cobject, part.cobject);
        }

        public void removePart(MimePart part) {
            camel_multipart_add_part(cobject, part.cobject);
        }

        public MimePart getPart(int index) {
            IntPtr o;

            o = camel_multipart_get_part(cobject, index);
            if (o != (IntPtr)0)
                return (MimePart)Object.fromCamel(o);
            else
                return null;
        }

        public int getNumber() {
            return camel_multipart_get_number(cobject);
        }

        // FIXME: finish
    }

    public class MimePart : Camel.Medium {
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_part_new();
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_part_get_description(IntPtr o);
        [DllImport("camel-1.2")] static extern void camel_mime_part_set_description(IntPtr o, string s);
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_part_get_disposition(IntPtr o);
        [DllImport("camel-1.2")] static extern void camel_mime_part_set_disposition(IntPtr o, string s);
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_part_get_filename(IntPtr o);
        [DllImport("camel-1.2")] static extern void camel_mime_part_set_filename(IntPtr o, string s);

        public MimePart(IntPtr raw) : base(raw) { }

        public string description {
            get { return Marshal.PtrToStringAuto(camel_mime_part_get_description(cobject)); }
            set { camel_mime_part_set_description(cobject, value); }
        }

        public string disposition {
            get { return Marshal.PtrToStringAuto(camel_mime_part_get_disposition(cobject)); }
            set { camel_mime_part_set_disposition(cobject, value); }
        }

        public string filename {
            get { return Marshal.PtrToStringAuto(camel_mime_part_get_filename(cobject)); }
            set { camel_mime_part_set_filename(cobject, value); }
        }

        // FIXME: finish
    }

    public class MimeMessage : Camel.MimePart {
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_message_new();
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_message_get_subject(IntPtr o);
        [DllImport("camel-1.2")] static extern void camel_mime_message_set_subject(IntPtr o, string s);
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_message_get_from(IntPtr o);
        [DllImport("camel-1.2")] static extern void camel_mime_message_set_from(IntPtr o, IntPtr s);
        [DllImport("camel-1.2")] static extern IntPtr camel_mime_message_get_recipients(IntPtr o, string type);
        [DllImport("camel-1.2")] static extern void camel_mime_message_set_recipients(IntPtr o, string type, IntPtr s);

        public MimeMessage(IntPtr raw) : base(raw) { }

        /* We need to use factories to create new objects otherwise the parent will instantiate an instance
           of itself instead during the constructor setup */
        public MimeMessage() : base((IntPtr)0) {
            cobject = camel_mime_message_new();
            toCamel(this);
        }

        public string subject {
            get { return Marshal.PtrToStringAuto(camel_mime_message_get_subject(cobject)); }
            set { camel_mime_message_set_subject(cobject, value); }
        }

        public InternetAddress from {
            get { return new InternetAddress(camel_mime_message_get_from(cobject)); }
            set { camel_mime_message_set_from(cobject, value.cobject); }
        }
        
        public InternetAddress to {
            get { return new InternetAddress(camel_mime_message_get_recipients(cobject, "to")); }
            set { camel_mime_message_set_recipients(cobject, "to", value.cobject); }
        }

        public InternetAddress cc {
            get { return new InternetAddress(camel_mime_message_get_recipients(cobject, "cc")); }
            set { camel_mime_message_set_recipients(cobject, "cc", value.cobject); }
        }

        public InternetAddress bcc {
            get { return new InternetAddress(camel_mime_message_get_recipients(cobject, "bcc")); }
            set { camel_mime_message_set_recipients(cobject, "bcc", value.cobject); }
        }

        public InternetAddress resentTO {
            get { return new InternetAddress(camel_mime_message_get_recipients(cobject, "resent-to")); }
            set { camel_mime_message_set_recipients(cobject, "resent-to", value.cobject); }
        }

        public InternetAddress resentCC {
            get { return new InternetAddress(camel_mime_message_get_recipients(cobject, "resent-cc")); }
            set { camel_mime_message_set_recipients(cobject, "resent-cc", value.cobject); }
        }

        public InternetAddress resentBCC {
            get { return new InternetAddress(camel_mime_message_get_recipients(cobject, "resent-bcc")); }
            set { camel_mime_message_set_recipients(cobject, "resent-bcc", value.cobject); }
        }
    }

    // subclass real streams?  or real stream interfaces?
    public class Stream : Camel.Object {
        public Stream(IntPtr raw) : base(raw) { }

        [DllImport("camel-1.2")] static extern int camel_stream_write(IntPtr o, byte [] data, int len);
        [DllImport("camel-1.2")] static extern int camel_stream_read(IntPtr o, byte [] data, int len);
        [DllImport("camel-1.2")] static extern int camel_stream_eos(IntPtr o);
        [DllImport("camel-1.2")] static extern int camel_stream_close(IntPtr o);
        [DllImport("camel-1.2")] static extern int camel_stream_flush(IntPtr o);
        [DllImport("camel-1.2")] static extern int camel_stream_reset(IntPtr o);

        public int write(byte [] data, int len) {
            int ret;

            ret = camel_stream_write(cobject, data, len);
            if (ret == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO write Error");

            return ret;
        }

        public int write(string value) {
            int ret;
            byte [] data;
            System.Text.UTF8Encoding enc = new System.Text.UTF8Encoding();

            data = enc.GetBytes(value);
            ret = camel_stream_write(cobject, data, data.Length);
            if (ret == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO write Error");

            return ret;
        }


        public int read(byte [] data, int len) {
            int ret;

            ret = camel_stream_read(cobject, data, len);
            if (ret == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO read Error");

            return ret;
        }

        public void close() {
            if (camel_stream_close(cobject) == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO close Error");
        }

        public void reset() {
            if (camel_stream_reset(cobject) == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO reset Error");
        }

        public void flush() {
            if (camel_stream_flush(cobject) == -1)
                throw new Exception(Exception.Type.SYSTEM, "IO close Error");
        }

        public bool eos() {
            return (camel_stream_eos(cobject) != 0);
        }
    }

    public class SeekableStream : Camel.Stream {
        public SeekableStream(IntPtr raw) : base(raw) { }
    }

    public class StreamFS : Camel.SeekableStream {
        public enum Flags {
            O_RDONLY = 00,
            O_WRONLY = 01,
            O_RDWR   = 02,
            O_CREAT  = 0100,
            O_EXCL   = 0200,
            O_TRUNC  = 01000,
            O_APPEND = 02000
        }

        public static int STDIN_FILENO = 0;
        public static int STDOUT_FILENO = 1;
        public static int STDERR_FILENO = 2;

        public StreamFS(IntPtr raw) : base(raw) { }

        [DllImport("camel-1.2")] static extern IntPtr camel_stream_fs_new_with_name(string name, int flags, int mode);
        [DllImport("camel-1.2")] static extern IntPtr camel_stream_fs_new_with_fd(int fd);

        public StreamFS(string name, Flags flags, int mode) : base((IntPtr)0) {
            cobject = camel_stream_fs_new_with_name(name, (int)flags, mode);
            toCamel(this);
        }

        public StreamFS(int fd) : base((IntPtr)0) {
            cobject = camel_stream_fs_new_with_fd(fd);
            toCamel(this);
        }
    }

    // this should obviously be extracted at build time
    [StructLayout (LayoutKind.Explicit)]
    struct CamelStreamMem {
        [FieldOffset(44)] public IntPtr buffer;
    }

    struct GByteArray {
        public IntPtr data;
        public int len;
    }

    struct GPtrArray {
        public IntPtr pdata;
        public int len;
    }

    public class StreamMem : Camel.SeekableStream {
        public StreamMem(IntPtr raw) : base(raw) { }

        [DllImport("camel-1.2")]
                static extern IntPtr camel_stream_mem_new();

        /* stupid c# */
        public StreamMem() : base((IntPtr)0) {
            cobject = camel_stream_mem_new();
            toCamel(this);
        }

        // should probably have some sort of interface for incremental/range gets too
        public Byte[] getBuffer() {
            CamelStreamMem mem = (CamelStreamMem)Marshal.PtrToStructure(cobject, typeof(CamelStreamMem));
            GByteArray ba = (GByteArray)Marshal.PtrToStructure(mem.buffer, typeof(GByteArray));
            Byte[] res = new Byte[ba.len];

            Marshal.Copy(ba.data, res, 0, ba.len);

            return res;
        }
    }

    // should do iterators etc?
    public class Address : Camel.Object {
        public Address(IntPtr raw) : base (raw) { }

        [DllImport("camel-1.2")] static extern IntPtr camel_address_new();
        [DllImport("camel-1.2")] static extern int camel_address_length(IntPtr raw);
        [DllImport("camel-1.2")] static extern int camel_address_decode(IntPtr raw, string addr);
        [DllImport("camel-1.2")] static extern string camel_address_encode(IntPtr raw);
        [DllImport("camel-1.2")] static extern int camel_address_unformat(IntPtr raw, string addr);
        [DllImport("camel-1.2")] static extern string camel_address_format(IntPtr raw);
        [DllImport("camel-1.2")] static extern int camel_address_cat(IntPtr raw, IntPtr src);
        [DllImport("camel-1.2")] static extern int camel_address_copy(IntPtr raw, IntPtr src);
        [DllImport("camel-1.2")] static extern void camel_address_remove(IntPtr raw, int index);

        public Address() : base((IntPtr)0) {
            cobject = camel_address_new();
            toCamel(this);
        }

        public int length() {
            return camel_address_length(cobject);
        }

        public void decode(string addr) {
            if (camel_address_decode(cobject, addr) == -1)
                throw new Exception(Exception.Type.SYSTEM, "Invalid address: " + addr);
        }

        public string encode() {
            return camel_address_encode(cobject);
        }

        public void unformat(string addr) {
            if (camel_address_unformat(cobject, addr) == -1)
                throw new Exception(Exception.Type.SYSTEM, "Invalid address: " + addr);
        }

        public string format() {
            return camel_address_format(cobject);
        }

        public void cat(Address from) {
            camel_address_cat(cobject, from.cobject);
        }

        public void copy(Address from) {
            camel_address_copy(cobject, from.cobject);
        }
    }

    public class InternetAddress : Camel.Address {
        public InternetAddress(IntPtr raw) : base (raw) { }
        
        [DllImport("camel-1.2")] static extern IntPtr camel_internet_address_new();
        [DllImport("camel-1.2")] static extern int camel_internet_address_add(IntPtr raw, string name, string addr);
        [DllImport("camel-1.2")] static extern bool camel_internet_address_get(IntPtr raw, out string name, out string addr);
        [DllImport("camel-1.2")] static extern int camel_internet_address_find_name(IntPtr raw, string name, out string addr);
        [DllImport("camel-1.2")] static extern int camel_internet_address_find_address(IntPtr raw, string addr, out string name);
        [DllImport("camel-1.2")] static extern string camel_internet_address_encode_address(out int len, string name, string addr);
        [DllImport("camel-1.2")] static extern string camel_internet_address_format_address(string name, string addr);
        
        public InternetAddress() : base((IntPtr)0) {
            cobject = camel_internet_address_new();
            toCamel(this);
        }

        public void add(string name, string addr) {
            camel_internet_address_add(cobject, name, addr);
        }

        public bool get(out string name, out string addr) {
            name = null;
            addr = null;
            return camel_internet_address_get(cobject, out name, out addr);
        }

        // this is a weird arsed interface ...
        public int findName(string name, out string addr) {
            addr = null;
            // FIXME: addr is const, need to marshal to local
            return camel_internet_address_find_name(cobject, name, out addr);
        }

        public int findAddress(string addr, out string name) {
            name = null;
            return camel_internet_address_find_name(cobject, addr, out name);
        }

        public static string encode(string name, string addr) {
            int len = 0;
            // another weird-arsed interface
            return camel_internet_address_encode_address(out len, name, addr);
        }

        public static string format(string name, string addr) {
            return camel_internet_address_format_address(name, addr);
        }
    }

    public class ContentType {
        public IntPtr cobject;

        public ContentType(IntPtr raw) {
            cobject = raw;
        }

        [DllImport("camel-1.2")] static extern bool camel_content_type_is(IntPtr raw, string type, string subtype);

        ~ContentType() {
        }

        public bool isType(string type, string subtype) {
            return camel_content_type_is(cobject, type, subtype);
        }
    }

    public class MessageInfo {
        public IntPtr cobject;
        private Tags user_tags;
        private Flags user_flags;

        private enum Type {
            SUBJECT,
            FROM,
            TO,
            CC,
            MLIST,

            FLAGS,
            SIZE,

            DATE_SENT,
            DATE_RECEIVED,

            MESSAGE_ID,
            REFERENCES,

            USER_FLAGS,
            USER_TAGS,

            LAST,
        }

        public class Tags {
            private MessageInfo mi;

            [DllImport("camel-provider-1.2")] static extern IntPtr camel_message_info_user_tag(IntPtr mi, String name);
            [DllImport("camel-provider-1.2")] static extern bool camel_message_info_set_user_tag(IntPtr mi, String name, String value);

            public Tags(MessageInfo raw) {
                mi = raw;
            }

            public String this [String tag] {
                get {
                    return Marshal.PtrToStringAnsi(camel_message_info_user_tag(mi.cobject, tag));
                }
                set {
                    camel_message_info_set_user_tag(mi.cobject, tag, value);
                }
            }
        }

        public class Flags {
            private MessageInfo mi;

            [DllImport("camel-provider-1.2")] static extern bool camel_message_info_user_flag(IntPtr miptr, String name);
            [DllImport("camel-provider-1.2")] static extern bool camel_message_info_set_user_flag(IntPtr miptr, String name, bool value);

            // note raw is a pointer to a pointer of tags
            public Flags(MessageInfo raw) {
                mi = raw;
            }

            public bool this [String tag] {
                get {
                    return camel_message_info_user_flag(mi.cobject, tag);
                }
                set {
                    camel_message_info_set_user_flag(mi.cobject, tag, value);
                }
            }
        }

        // only used to calculate offsets
        private struct CamelMessageInfo {
            IntPtr summary;
            uint refcount;
            string uid;
        };

        public MessageInfo(IntPtr raw) {
            cobject = raw;
        }

        [DllImport("camel-provider-1.2")] static extern void camel_folder_free_message_info(IntPtr raw, IntPtr info);
        [DllImport("camel-provider-1.2")] static extern void camel_message_info_free(IntPtr info);

        ~MessageInfo() {
            camel_message_info_free(cobject);
        }

        [DllImport("camel-provider-1.2")] static extern IntPtr camel_message_info_ptr(IntPtr raw, int type);
        [DllImport("camel-provider-1.2")] static extern uint camel_message_info_uint32(IntPtr raw, int type);
        [DllImport("camel-provider-1.2")] static extern uint camel_message_info_time(IntPtr raw, int type);

        public String uid { get { return Marshal.PtrToStringAuto(Marshal.ReadIntPtr(cobject, (int)Marshal.OffsetOf(typeof(CamelMessageInfo), "uid"))); } }

        public String subject { get { return Marshal.PtrToStringAnsi(camel_message_info_ptr(cobject, (int)Type.SUBJECT)); } }
        public String from { get { return Marshal.PtrToStringAnsi(camel_message_info_ptr(cobject, (int)Type.FROM)); } }
        public String to { get { return Marshal.PtrToStringAnsi(camel_message_info_ptr(cobject, (int)Type.TO)); } }
        public String cc { get { return Marshal.PtrToStringAnsi(camel_message_info_ptr(cobject, (int)Type.CC)); } }
        public String mlist { get { return Marshal.PtrToStringAnsi(camel_message_info_ptr(cobject, (int)Type.MLIST)); } }

        public uint flags { get { return camel_message_info_uint32(cobject, (int)Type.FLAGS); } }
        public uint size { get { return camel_message_info_uint32(cobject, (int)Type.SIZE); } }

        public Tags userTags {
            get {
                if (user_tags == null)
                    user_tags = new Tags(this);
                return user_tags;
            }
        }

        public Flags userFlags {
            get {
                if (user_flags == null)
                    user_flags = new Flags(this);
                return user_flags;
            }
        }
    }

    public class URL {
        public IntPtr cobject;
        internal Params param_list;

        // we never instantiate this, we just use it to describe the layout
        internal struct CamelURL {
            internal IntPtr protocol;
            internal IntPtr user;
            internal IntPtr authmech;
            internal IntPtr passwd;
            internal IntPtr host;
            internal int    port;
            internal IntPtr path;
            internal IntPtr pparams;
            internal IntPtr query;
            internal IntPtr fragment;
        };

        public class Params {
            private URL parent;

            internal Params(URL _parent) {
                parent = _parent;
            }

            public string this[string name] {
                set { camel_url_set_param(parent.cobject, name, value); }
                get { return Marshal.PtrToStringAnsi(camel_url_get_param(parent.cobject, name)); }
            }
        }

        [DllImport("camel-1.2")] static extern IntPtr camel_url_new_with_base(IntPtr bbase, string url);
        [DllImport("camel-1.2")] static extern IntPtr camel_url_new(string url, ref CamelException ex);
        [DllImport("camel-1.2")] static extern string camel_url_to_string(IntPtr url, int flags);
        [DllImport("camel-1.2")] static extern void camel_url_free(IntPtr url);

        // this is a shit to wrap, needs accessors or other pain
        [DllImport("camel-1.2")] static extern void camel_url_set_protocol(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_user(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_authmech(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_passwd(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_host(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_port(IntPtr url, int p);
        [DllImport("camel-1.2")] static extern void camel_url_set_path(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_param(IntPtr url, string s, string v);
        [DllImport("camel-1.2")] static extern void camel_url_set_query(IntPtr url, string s);
        [DllImport("camel-1.2")] static extern void camel_url_set_fragment(IntPtr url, string s);

        [DllImport("camel-1.2")] static extern IntPtr camel_url_get_param(IntPtr url, string s);

        [DllImport("camel-1.2")] static extern string camel_url_encode(string url, string escape);
        // ugh we can't do this, it writes to its result??
        // -> use StringBuilder
        [DllImport("camel-1.2")] static extern IntPtr camel_url_decode(ref string url);

        public URL(string uri) {
            CamelException ex = new CamelException();

            cobject = camel_url_new(uri, ref ex);
            if (ex.id != 0)
                throw new Exception(ex);
        }

        public URL(URL bbase, string uri) {
            cobject = camel_url_new_with_base(bbase.cobject, uri);
        }

        ~URL() {
            camel_url_free(cobject);
        }

        /* its ugly but it works */
        private string field(string name) {
            return Marshal.PtrToStringAuto(Marshal.ReadIntPtr(cobject, (int)Marshal.OffsetOf(typeof(CamelURL), name)));
        }

        public string protocol {
            set { camel_url_set_protocol(cobject, value); }
            get { return field("protocol"); }
        }

        public string user {
            set { camel_url_set_user(cobject, value); }
            get { return field("user"); }
        }

        public string authmech {
            set { camel_url_set_authmech(cobject, value); }
            get { return field("authmech"); }
        }

        public string passwd {
            set { camel_url_set_passwd(cobject, value); }
            get { return field("passwd"); }
        }

        public string host {
            set { camel_url_set_host(cobject, value); }
            get { return field("host"); }
        }

        public int port {
            set { camel_url_set_port(cobject, value); }
            get { return (int)Marshal.ReadIntPtr(cobject, (int)Marshal.OffsetOf(typeof(CamelURL), "port")); }
        }

        public string path {
            set { camel_url_set_path(cobject, value); }
            get { return field("path"); }
        }

        public string query {
            set { camel_url_set_query(cobject, value); }
            get { return field("query"); }
        }

        public string fragment {
            set { camel_url_set_fragment(cobject, value); }
            get { return field("fragment"); }
        }

        public Params paramlist {
            get {
                if (param_list == null)
                    param_list = new Params(this);
                return param_list;
            }
        }

        public override string ToString() {
            return camel_url_to_string(cobject, 0);
        }

        public static string encode(string val) {
            return camel_url_encode(val, null);
        }

        public static string encode(string val, string escape) {
            return camel_url_encode(val, escape);
        }
    }
}

namespace Camel.Hash {
    public class Stream : System.IO.Stream {
        protected Camel.Stream substream;

        public Stream(Camel.Stream sub) {
            substream = sub;
        }

        public override bool CanSeek { get { return false; } }
        public override bool CanRead { get { return true; } }
        public override bool CanWrite { get { return true; } }
        public override long Length {
            get {
                throw new System.IO.IOException("Cannot get stream length");
            }
        }
        public override long Position {
            get {
                throw new System.IO.IOException("Cannot get stream position");
            }
            set {
                if (value == 0) {
                    substream.reset();
                } else {
                    throw new System.IO.IOException("Cannot set stream position");
                }
            }
        }
    
        public override int Read(byte[] buffer, int offset, int count) {
            // FIXME: how to add the offset to the buffer?
            return substream.read(buffer, count);
        }

        public override void Write(byte[] buffer, int offset, int count) {
            // FIXME: how to add the offset to the buffer?
            substream.write(buffer, count);
        }

        public override void Flush() {
            substream.flush();
        }

        public override long Seek(long offset, System.IO.SeekOrigin seek) {
            throw new System.IO.IOException("Seeking not supported");
        }

        public override void SetLength(long len) {
            throw new System.IO.IOException("Cannot set stream length");
        }
    }
}

/*
namespace Evolution.Mail {
    class Component : GLib.Object {
        public Component(IntPtr raw) : base(raw) {}
        public Component() : base() {}

        ~Component() {
            Dispose();
        }

        [DllImport("libevolution-mail.so")] static extern IntPtr mail_component_peek();
        [DllImport("libevolution-mail.so")] static extern IntPtr mail_component_peek_base_directory(IntPtr component);
        [DllImport("libevolution-mail.so")] static extern IntPtr mail_component_peek();

        public static Component peek() {
            return new Component(mail_component_peek());
        }

        public String baseDirectory {
            get {}
        }
}
*/