/*
 * Copyright 2016 Hans Leidekker for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "rpc.h"
#include "webservices.h"

#include "wine/debug.h"
#include "wine/list.h"
#include "wine/unicode.h"
#include "webservices_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(webservices);

static const char ns_env_1_1[] = "http://schemas.xmlsoap.org/soap/envelope/";
static const char ns_env_1_2[] = "http://www.w3.org/2003/05/soap-envelope";
static const char ns_addr_0_9[] = "http://schemas.xmlsoap.org/ws/2004/08/addressing";
static const char ns_addr_1_0[] = "http://www.w3.org/2005/08/addressing";

static const struct prop_desc msg_props[] =
{
    { sizeof(WS_MESSAGE_STATE), TRUE },         /* WS_MESSAGE_PROPERTY_STATE */
    { sizeof(WS_HEAP *), TRUE },                /* WS_MESSAGE_PROPERTY_HEAP */
    { sizeof(WS_ENVELOPE_VERSION), TRUE },      /* WS_MESSAGE_PROPERTY_ENVELOPE_VERSION */
    { sizeof(WS_ADDRESSING_VERSION), TRUE },    /* WS_MESSAGE_PROPERTY_ADDRESSING_VERSION */
    { sizeof(WS_XML_BUFFER *), TRUE },          /* WS_MESSAGE_PROPERTY_HEADER_BUFFER */
    { sizeof(WS_XML_NODE_POSITION *), TRUE },   /* WS_MESSAGE_PROPERTY_HEADER_POSITION */
    { sizeof(WS_XML_READER *), TRUE },          /* WS_MESSAGE_PROPERTY_BODY_READER */
    { sizeof(WS_XML_WRITER *), TRUE },          /* WS_MESSAGE_PROPERTY_BODY_WRITER */
    { sizeof(BOOL), TRUE },                     /* WS_MESSAGE_PROPERTY_IS_ADDRESSED */
};

struct header
{
    WS_HEADER_TYPE type;
    BOOL           mapped;
    WS_XML_STRING  name;
    WS_XML_STRING  ns;
    union
    {
        WS_XML_BUFFER *buf;
        WS_XML_STRING *text;
    } u;
};

struct msg
{
    ULONG                               magic;
    CRITICAL_SECTION                    cs;
    WS_MESSAGE_INITIALIZATION           init;
    WS_MESSAGE_STATE                    state;
    GUID                                id;
    WS_ENVELOPE_VERSION                 version_env;
    WS_ADDRESSING_VERSION               version_addr;
    BOOL                                is_addressed;
    WS_STRING                           addr;
    WS_STRING                           action;
    WS_HEAP                            *heap;
    WS_XML_BUFFER                      *buf;
    WS_XML_WRITER                      *writer;
    WS_XML_WRITER                      *writer_body;
    WS_XML_READER                      *reader_body;
    ULONG                               header_count;
    ULONG                               header_size;
    struct header                     **header;
    WS_PROXY_MESSAGE_CALLBACK_CONTEXT   ctx_send;
    WS_PROXY_MESSAGE_CALLBACK_CONTEXT   ctx_receive;
    ULONG                               prop_count;
    struct prop                         prop[sizeof(msg_props)/sizeof(msg_props[0])];
};

#define MSG_MAGIC (('M' << 24) | ('E' << 16) | ('S' << 8) | 'S')
#define HEADER_ARRAY_SIZE 2

static struct msg *alloc_msg(void)
{
    static const ULONG count = sizeof(msg_props)/sizeof(msg_props[0]);
    struct msg *ret;
    ULONG size = sizeof(*ret) + prop_size( msg_props, count );

    if (!(ret = heap_alloc_zero( size ))) return NULL;
    if (!(ret->header = heap_alloc( HEADER_ARRAY_SIZE * sizeof(struct header *) )))
    {
        heap_free( ret );
        return NULL;
    }
    ret->magic       = MSG_MAGIC;
    ret->state       = WS_MESSAGE_STATE_EMPTY;
    ret->header_size = HEADER_ARRAY_SIZE;

    InitializeCriticalSection( &ret->cs );
    ret->cs.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": msg.cs");

    prop_init( msg_props, count, ret->prop, &ret[1] );
    ret->prop_count  = count;
    return ret;
}

static void free_header( struct header *header )
{
    heap_free( header->name.bytes );
    heap_free( header->ns.bytes );
    if (header->mapped) heap_free( header->u.text );
    heap_free( header );
}

static void reset_msg( struct msg *msg )
{
    ULONG i;

    msg->state         = WS_MESSAGE_STATE_EMPTY;
    msg->init          = 0;
    UuidCreate( &msg->id );
    msg->is_addressed  = FALSE;
    heap_free( msg->addr.chars );
    msg->addr.chars    = NULL;
    msg->addr.length   = 0;

    heap_free( msg->action.chars );
    msg->action.chars  = NULL;
    msg->action.length = 0;

    WsResetHeap( msg->heap, NULL );
    msg->buf           = NULL; /* allocated on msg->heap */
    msg->writer_body   = NULL; /* owned by caller */
    msg->reader_body   = NULL; /* owned by caller */

    for (i = 0; i < msg->header_count; i++)
    {
        free_header( msg->header[i] );
        msg->header[i] = NULL;
    }
    msg->header_count  = 0;

    memset( &msg->ctx_send, 0, sizeof(msg->ctx_send) );
    memset( &msg->ctx_receive, 0, sizeof(msg->ctx_receive) );
}

static void free_msg( struct msg *msg )
{
    reset_msg( msg );

    WsFreeWriter( msg->writer );
    WsFreeHeap( msg->heap );
    heap_free( msg->header );

    msg->cs.DebugInfo->Spare[0] = 0;
    DeleteCriticalSection( &msg->cs );
    heap_free( msg );
}

#define HEAP_MAX_SIZE (1 << 16)
static HRESULT create_msg( WS_ENVELOPE_VERSION env_version, WS_ADDRESSING_VERSION addr_version,
                           const WS_MESSAGE_PROPERTY *properties, ULONG count, WS_MESSAGE **handle )
{
    struct msg *msg;
    HRESULT hr;
    ULONG i;

    if (!(msg = alloc_msg())) return E_OUTOFMEMORY;

    for (i = 0; i < count; i++)
    {
        if (properties[i].id == WS_MESSAGE_PROPERTY_ENVELOPE_VERSION ||
            properties[i].id == WS_MESSAGE_PROPERTY_ADDRESSING_VERSION)
        {
            free_msg( msg );
            return E_INVALIDARG;
        }
        hr = prop_set( msg->prop, msg->prop_count, properties[i].id, properties[i].value,
                       properties[i].valueSize );
        if (hr != S_OK)
        {
            free_msg( msg );
            return hr;
        }
    }

    if ((hr = WsCreateHeap( HEAP_MAX_SIZE, 0, NULL, 0, &msg->heap, NULL )) != S_OK)
    {
        free_msg( msg );
        return hr;
    }

    UuidCreate( &msg->id );
    msg->version_env  = env_version;
    msg->version_addr = addr_version;

    *handle = (WS_MESSAGE *)msg;
    return S_OK;
}

/**************************************************************************
 *          WsCreateMessage		[webservices.@]
 */
HRESULT WINAPI WsCreateMessage( WS_ENVELOPE_VERSION env_version, WS_ADDRESSING_VERSION addr_version,
                                const WS_MESSAGE_PROPERTY *properties, ULONG count, WS_MESSAGE **handle,
                                WS_ERROR *error )
{
    TRACE( "%u %u %p %u %p %p\n", env_version, addr_version, properties, count, handle, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!handle || !env_version || !addr_version) return E_INVALIDARG;
    return create_msg( env_version, addr_version, properties, count, handle );
}

/**************************************************************************
 *          WsCreateMessageForChannel		[webservices.@]
 */
HRESULT WINAPI WsCreateMessageForChannel( WS_CHANNEL *channel_handle, const WS_MESSAGE_PROPERTY *properties,
                                          ULONG count, WS_MESSAGE **handle, WS_ERROR *error )
{
    WS_ENVELOPE_VERSION version_env;
    WS_ADDRESSING_VERSION version_addr;
    HRESULT hr;

    TRACE( "%p %p %u %p %p\n", channel_handle, properties, count, handle, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!channel_handle || !handle) return E_INVALIDARG;

    if ((hr = WsGetChannelProperty( channel_handle, WS_CHANNEL_PROPERTY_ENVELOPE_VERSION, &version_env,
                                    sizeof(version_env), NULL )) != S_OK || !version_env)
        version_env = WS_ENVELOPE_VERSION_SOAP_1_2;

    if ((hr = WsGetChannelProperty( channel_handle, WS_CHANNEL_PROPERTY_ADDRESSING_VERSION, &version_addr,
                                    sizeof(version_addr), NULL )) != S_OK || !version_addr)
        version_addr = WS_ADDRESSING_VERSION_1_0;

    return create_msg( version_env, version_addr, properties, count, handle );
}

/**************************************************************************
 *          WsFreeMessage		[webservices.@]
 */
void WINAPI WsFreeMessage( WS_MESSAGE *handle )
{
    struct msg *msg = (struct msg *)handle;

    TRACE( "%p\n", handle );

    if (!msg) return;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return;
    }

    msg->magic = 0;

    LeaveCriticalSection( &msg->cs );
    free_msg( msg );
}

/**************************************************************************
 *          WsResetMessage		[webservices.@]
 */
HRESULT WINAPI WsResetMessage( WS_MESSAGE *handle, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;

    TRACE( "%p %p\n", handle, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    reset_msg( msg );

    LeaveCriticalSection( &msg->cs );
    return S_OK;
}

/**************************************************************************
 *          WsGetMessageProperty		[webservices.@]
 */
HRESULT WINAPI WsGetMessageProperty( WS_MESSAGE *handle, WS_MESSAGE_PROPERTY_ID id, void *buf,
                                     ULONG size, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr = S_OK;

    TRACE( "%p %u %p %u %p\n", handle, id, buf, size, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    switch (id)
    {
    case WS_MESSAGE_PROPERTY_STATE:
        if (!buf || size != sizeof(msg->state)) hr = E_INVALIDARG;
        else *(WS_MESSAGE_STATE *)buf = msg->state;
        break;

    case WS_MESSAGE_PROPERTY_HEAP:
        if (!buf || size != sizeof(msg->heap)) hr = E_INVALIDARG;
        else *(WS_HEAP **)buf = msg->heap;
        break;

    case WS_MESSAGE_PROPERTY_ENVELOPE_VERSION:
        if (!buf || size != sizeof(msg->version_env)) hr = E_INVALIDARG;
        else *(WS_ENVELOPE_VERSION *)buf = msg->version_env;
        break;

    case WS_MESSAGE_PROPERTY_ADDRESSING_VERSION:
        if (!buf || size != sizeof(msg->version_addr)) hr = E_INVALIDARG;
        else *(WS_ADDRESSING_VERSION *)buf = msg->version_addr;
        break;

    case WS_MESSAGE_PROPERTY_HEADER_BUFFER:
        if (!buf || size != sizeof(msg->buf)) hr = E_INVALIDARG;
        else *(WS_XML_BUFFER **)buf = msg->buf;
        break;

    case WS_MESSAGE_PROPERTY_BODY_READER:
        if (!buf || size != sizeof(msg->reader_body)) hr = E_INVALIDARG;
        else *(WS_XML_READER **)buf = msg->reader_body;
        break;

    case WS_MESSAGE_PROPERTY_BODY_WRITER:
        if (!buf || size != sizeof(msg->writer_body)) hr = E_INVALIDARG;
        else *(WS_XML_WRITER **)buf = msg->writer_body;
        break;

    case WS_MESSAGE_PROPERTY_IS_ADDRESSED:
        if (msg->state < WS_MESSAGE_STATE_INITIALIZED) hr = WS_E_INVALID_OPERATION;
        else *(BOOL *)buf = msg->is_addressed;
        break;

    default:
        hr = prop_get( msg->prop, msg->prop_count, id, buf, size );
    }

    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsSetMessageProperty		[webservices.@]
 */
HRESULT WINAPI WsSetMessageProperty( WS_MESSAGE *handle, WS_MESSAGE_PROPERTY_ID id, const void *value,
                                     ULONG size, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %u %p %u\n", handle, id, value, size );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    switch (id)
    {
    case WS_MESSAGE_PROPERTY_STATE:
    case WS_MESSAGE_PROPERTY_ENVELOPE_VERSION:
    case WS_MESSAGE_PROPERTY_ADDRESSING_VERSION:
    case WS_MESSAGE_PROPERTY_IS_ADDRESSED:
        if (msg->state < WS_MESSAGE_STATE_INITIALIZED) hr = WS_E_INVALID_OPERATION;
        else hr = E_INVALIDARG;
        break;

    default:
        hr = prop_set( msg->prop, msg->prop_count, id, value, size );
    }

    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsAddressMessage		[webservices.@]
 */
HRESULT WINAPI WsAddressMessage( WS_MESSAGE *handle, const WS_ENDPOINT_ADDRESS *addr, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr = S_OK;

    TRACE( "%p %p %p\n", handle, addr, error );
    if (error) FIXME( "ignoring error parameter\n" );
    if (addr && (addr->headers || addr->extensions || addr->identity))
    {
        FIXME( "headers, extensions or identity not supported\n" );
        return E_NOTIMPL;
    }

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED || msg->is_addressed)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if (addr && addr->url.length)
    {
        if (!(msg->addr.chars = heap_alloc( addr->url.length * sizeof(WCHAR) ))) hr = E_OUTOFMEMORY;
        else
        {
            memcpy( msg->addr.chars, addr->url.chars, addr->url.length * sizeof(WCHAR) );
            msg->addr.length = addr->url.length;
        }
    }

    if (hr == S_OK) msg->is_addressed = TRUE;

    LeaveCriticalSection( &msg->cs );
    return hr;
}

static HRESULT get_env_namespace( WS_ENVELOPE_VERSION ver, WS_XML_STRING *str )
{
    switch (ver)
    {
    case WS_ENVELOPE_VERSION_SOAP_1_1:
        str->bytes  = (BYTE *)ns_env_1_1;
        str->length = sizeof(ns_env_1_1)/sizeof(ns_env_1_1[0]) - 1;
        return S_OK;

    case WS_ENVELOPE_VERSION_SOAP_1_2:
        str->bytes  = (BYTE *)ns_env_1_2;
        str->length = sizeof(ns_env_1_2)/sizeof(ns_env_1_2[0]) - 1;
        return S_OK;

    default:
        ERR( "unhandled envelope version %u\n", ver );
        return E_NOTIMPL;
    }
}

static HRESULT get_addr_namespace( WS_ADDRESSING_VERSION ver, WS_XML_STRING *str )
{
    switch (ver)
    {
    case WS_ADDRESSING_VERSION_0_9:
        str->bytes  = (BYTE *)ns_addr_0_9;
        str->length = sizeof(ns_addr_0_9)/sizeof(ns_addr_0_9[0]) - 1;
        return S_OK;

    case WS_ADDRESSING_VERSION_1_0:
        str->bytes  = (BYTE *)ns_addr_1_0;
        str->length = sizeof(ns_addr_1_0)/sizeof(ns_addr_1_0[0]) - 1;
        return S_OK;

    case WS_ADDRESSING_VERSION_TRANSPORT:
        str->bytes  = NULL;
        str->length = 0;
        return S_OK;

    default:
        ERR( "unhandled addressing version %u\n", ver );
        return E_NOTIMPL;
    }
}

static const WS_XML_STRING *get_header_name( WS_HEADER_TYPE type )
{
    static const WS_XML_STRING headers[] =
    {
        {6, (BYTE *)"Action"},
        {2, (BYTE *)"To"},
        {9, (BYTE *)"MessageID"},
        {9, (BYTE *)"RelatesTo"},
        {4, (BYTE *)"From"},
        {7, (BYTE *)"ReplyTo"},
        {7, (BYTE *)"FaultTo"},
    };

    if (type < WS_ACTION_HEADER || type > WS_FAULT_TO_HEADER)
    {
        ERR( "unknown type %u\n", type );
        return NULL;
    }

    return &headers[type - 1];
}

static HRESULT write_headers( struct msg *msg, const WS_XML_STRING *ns_env, const WS_XML_STRING *ns_addr,
                              WS_XML_WRITER *writer )
{
    static const char anonymous[] = "http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous";
    static const WS_XML_STRING prefix_s = {1, (BYTE *)"s"}, prefix_a = {1, (BYTE *)"a"};
    static const WS_XML_STRING msgid = {9, (BYTE *)"MessageID"}, replyto = {7, (BYTE *)"ReplyTo"};
    static const WS_XML_STRING address = {7, (BYTE *)"Address"}, header = {6, (BYTE *)"Header"};
    WS_XML_UTF8_TEXT urn, addr;
    HRESULT hr;
    ULONG i;

    if ((hr = WsWriteXmlnsAttribute( writer, &prefix_a, ns_addr, FALSE, NULL )) != S_OK) return hr;
    if ((hr = WsWriteStartElement( writer, &prefix_s, &header, ns_env, NULL )) != S_OK) return hr;

    if ((hr = WsWriteStartElement( writer, &prefix_a, &msgid, ns_addr, NULL )) != S_OK) return hr;
    urn.text.textType = WS_XML_TEXT_TYPE_UNIQUE_ID;
    memcpy( &urn.value, &msg->id, sizeof(msg->id) );
    if ((hr = WsWriteText( writer, &urn.text, NULL )) != S_OK) return hr;
    if ((hr = WsWriteEndElement( writer, NULL )) != S_OK) return hr; /* </a:MessageID> */

    if (msg->version_addr == WS_ADDRESSING_VERSION_0_9)
    {
        if ((hr = WsWriteStartElement( writer, &prefix_a, &replyto, ns_addr, NULL )) != S_OK) return hr;
        if ((hr = WsWriteStartElement( writer, &prefix_a, &address, ns_addr, NULL )) != S_OK) return hr;

        addr.text.textType = WS_XML_TEXT_TYPE_UTF8;
        addr.value.bytes   = (BYTE *)anonymous;
        addr.value.length  = sizeof(anonymous) - 1;
        if ((hr = WsWriteText( writer, &addr.text, NULL )) != S_OK) return hr;
        if ((hr = WsWriteEndElement( writer, NULL )) != S_OK) return hr; /* </a:Address> */
        if ((hr = WsWriteEndElement( writer, NULL )) != S_OK) return hr; /* </a:ReplyTo> */
    }

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->mapped) continue;
        if ((hr = WsWriteXmlBuffer( writer, msg->header[i]->u.buf, NULL )) != S_OK) return hr;
    }

    return WsWriteEndElement( writer, NULL ); /* </s:Header> */
}

static HRESULT write_headers_transport( struct msg *msg, const WS_XML_STRING *ns_env, WS_XML_WRITER *writer )
{
    static const WS_XML_STRING prefix = {1, (BYTE *)"s"}, header = {6, (BYTE *)"Header"};
    HRESULT hr = S_OK;
    ULONG i;

    if ((msg->header_count || !msg->action.length) &&
        (hr = WsWriteStartElement( writer, &prefix, &header, ns_env, NULL )) != S_OK) return hr;

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->mapped) continue;
        if ((hr = WsWriteXmlBuffer( writer, msg->header[i]->u.buf, NULL )) != S_OK) return hr;
    }

    if (msg->header_count || !msg->action.length) hr = WsWriteEndElement( writer, NULL ); /* </s:Header> */
    return hr;
}

static HRESULT write_envelope_start( struct msg *msg, WS_XML_WRITER *writer )
{
    static const WS_XML_STRING envelope = {8, (BYTE *)"Envelope"}, body = {4, (BYTE *)"Body"};
    static const WS_XML_STRING prefix = {1, (BYTE *)"s"};
    WS_XML_STRING ns_env, ns_addr;
    HRESULT hr;

    if ((hr = get_env_namespace( msg->version_env, &ns_env )) != S_OK) return hr;
    if ((hr = get_addr_namespace( msg->version_addr, &ns_addr )) != S_OK) return hr;
    if ((hr = WsWriteStartElement( writer, &prefix, &envelope, &ns_env, NULL )) != S_OK) return hr;

    if (msg->version_addr == WS_ADDRESSING_VERSION_TRANSPORT)
        hr = write_headers_transport( msg, &ns_env, writer );
    else
        hr = write_headers( msg, &ns_env, &ns_addr, writer );
    if (hr != S_OK) return hr;

    return WsWriteStartElement( writer, &prefix, &body, &ns_env, NULL ); /* <s:Body> */
}

static HRESULT write_envelope_end( WS_XML_WRITER *writer )
{
    HRESULT hr;
    if ((hr = WsWriteEndElement( writer, NULL )) != S_OK) return hr; /* </s:Body> */
    return WsWriteEndElement( writer, NULL ); /* </s:Envelope> */
}

static HRESULT write_envelope( struct msg *msg )
{
    HRESULT hr;
    if (!msg->writer && (hr = WsCreateWriter( NULL, 0, &msg->writer, NULL )) != S_OK) return hr;
    if (!msg->buf && (hr = WsCreateXmlBuffer( msg->heap, NULL, 0, &msg->buf, NULL )) != S_OK) return hr;
    if ((hr = WsSetOutputToBuffer( msg->writer, msg->buf, NULL, 0, NULL )) != S_OK) return hr;
    if ((hr = write_envelope_start( msg, msg->writer )) != S_OK) return hr;
    return write_envelope_end( msg->writer );
}

/**************************************************************************
 *          WsWriteEnvelopeStart		[webservices.@]
 */
HRESULT WINAPI WsWriteEnvelopeStart( WS_MESSAGE *handle, WS_XML_WRITER *writer,
                                     WS_MESSAGE_DONE_CALLBACK cb, void *state, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %p %p %p %p\n", handle, writer, cb, state, error );
    if (error) FIXME( "ignoring error parameter\n" );
    if (cb)
    {
        FIXME( "callback not supported\n" );
        return E_NOTIMPL;
    }

    if (!msg || !writer) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state != WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if ((hr = write_envelope( msg )) != S_OK) goto done;
    if ((hr = write_envelope_start( msg, writer )) != S_OK) goto done;

    msg->writer_body = writer;
    msg->state       = WS_MESSAGE_STATE_WRITING;

done:
    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsWriteEnvelopeEnd		[webservices.@]
 */
HRESULT WINAPI WsWriteEnvelopeEnd( WS_MESSAGE *handle, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %p\n", handle, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state != WS_MESSAGE_STATE_WRITING)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if ((hr = write_envelope_end( msg->writer_body )) == S_OK) msg->state = WS_MESSAGE_STATE_DONE;

    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsWriteBody		[webservices.@]
 */
HRESULT WINAPI WsWriteBody( WS_MESSAGE *handle, const WS_ELEMENT_DESCRIPTION *desc, WS_WRITE_OPTION option,
                            const void *value, ULONG size, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %p %08x %p %u %p\n", handle, desc, option, value, size, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || !desc) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state != WS_MESSAGE_STATE_WRITING)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if (desc->elementLocalName &&
        (hr = WsWriteStartElement( msg->writer_body, NULL, desc->elementLocalName, desc->elementNs,
                                   NULL )) != S_OK) goto done;

    if ((hr = WsWriteType( msg->writer_body, WS_ANY_ELEMENT_TYPE_MAPPING, desc->type, desc->typeDescription,
                           option, value, size, NULL )) != S_OK) goto done;

    if (desc->elementLocalName) hr = WsWriteEndElement( msg->writer_body, NULL );

done:
    LeaveCriticalSection( &msg->cs );
    return hr;
}

static BOOL match_current_element( WS_XML_READER *reader, const WS_XML_STRING *localname )
{
    const WS_XML_NODE *node;
    const WS_XML_ELEMENT_NODE *elem;

    if (WsGetReaderNode( reader, &node, NULL ) != S_OK) return FALSE;
    if (node->nodeType != WS_XML_NODE_TYPE_ELEMENT) return FALSE;
    elem = (const WS_XML_ELEMENT_NODE *)node;
    return WsXmlStringEquals( elem->localName, localname, NULL ) == S_OK;
}

static HRESULT read_envelope_start( WS_XML_READER *reader )
{
    static const WS_XML_STRING envelope = {8, (BYTE *)"Envelope"}, body = {4, (BYTE *)"Body"};
    static const WS_XML_STRING header = {6, (BYTE *)"Header"};
    HRESULT hr;

    if ((hr = WsReadNode( reader, NULL )) != S_OK) return hr;
    if (!match_current_element( reader, &envelope )) return WS_E_INVALID_FORMAT;
    if ((hr = WsReadNode( reader, NULL )) != S_OK) return hr;
    if (match_current_element( reader, &header ))
    {
        for (;;)
        {
            /* FIXME: store headers */
            if ((hr = WsReadNode( reader, NULL )) != S_OK) return hr;
            if (match_current_element( reader, &body )) break;
        }
    }
    if (!match_current_element( reader, &body )) return WS_E_INVALID_FORMAT;
    return WsReadNode( reader, NULL );
}

/**************************************************************************
 *          WsReadEnvelopeStart		[webservices.@]
 */
HRESULT WINAPI WsReadEnvelopeStart( WS_MESSAGE *handle, WS_XML_READER *reader, WS_MESSAGE_DONE_CALLBACK cb,
                                    void *state, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %p %p %p %p\n", handle, reader, cb, state, error );
    if (error) FIXME( "ignoring error parameter\n" );
    if (cb)
    {
        FIXME( "callback not supported\n" );
        return E_NOTIMPL;
    }

    if (!msg || !reader) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state != WS_MESSAGE_STATE_EMPTY)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if ((hr = read_envelope_start( reader )) == S_OK)
    {
        msg->reader_body = reader;
        msg->state       = WS_MESSAGE_STATE_READING;
    }

    LeaveCriticalSection( &msg->cs );
    return hr;
}

static HRESULT read_envelope_end( WS_XML_READER *reader )
{
    HRESULT hr;
    if ((hr = WsReadEndElement( reader, NULL )) != S_OK) return hr; /* </s:Body> */
    return WsReadEndElement( reader, NULL ); /* </s:Envelope> */
}

/**************************************************************************
 *          WsReadEnvelopeEnd		[webservices.@]
 */
HRESULT WINAPI WsReadEnvelopeEnd( WS_MESSAGE *handle, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %p\n", handle, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state != WS_MESSAGE_STATE_READING)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if ((hr = read_envelope_end( msg->reader_body )) == S_OK) msg->state = WS_MESSAGE_STATE_DONE;

    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsReadBody		[webservices.@]
 */
HRESULT WINAPI WsReadBody( WS_MESSAGE *handle, const WS_ELEMENT_DESCRIPTION *desc, WS_READ_OPTION option,
                           WS_HEAP *heap, void *value, ULONG size, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %p %08x %p %p %u %p\n", handle, desc, option, heap, value, size, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || !desc) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state != WS_MESSAGE_STATE_READING)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    hr = WsReadElement( msg->reader_body, desc, option, heap, value, size, NULL );

    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsInitializeMessage		[webservices.@]
 */
HRESULT WINAPI WsInitializeMessage( WS_MESSAGE *handle, WS_MESSAGE_INITIALIZATION init,
                                    WS_MESSAGE *src_handle, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr;

    TRACE( "%p %u %p %p\n", handle, init, src_handle, error );
    if (error) FIXME( "ignoring error parameter\n" );
    if (src_handle)
    {
        FIXME( "src message not supported\n" );
        return E_NOTIMPL;
    }

    if (!msg || init > WS_FAULT_MESSAGE) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state >= WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if ((hr = write_envelope( msg )) == S_OK)
    {
        msg->init  = init;
        msg->state = WS_MESSAGE_STATE_INITIALIZED;
    }

    LeaveCriticalSection( &msg->cs );
    return hr;
}

static HRESULT grow_header_array( struct msg *msg, ULONG size )
{
    struct header **tmp;
    if (size <= msg->header_size) return S_OK;
    if (!(tmp = heap_realloc( msg->header, 2 * msg->header_size * sizeof(struct header *) )))
        return E_OUTOFMEMORY;
    msg->header = tmp;
    msg->header_size *= 2;
    return S_OK;
}

static struct header *alloc_header( WS_HEADER_TYPE type, BOOL mapped, const WS_XML_STRING *name,
                                    const WS_XML_STRING *ns )
{
    struct header *ret;
    if (!(ret = heap_alloc_zero( sizeof(*ret) ))) return NULL;
    if (name && name->length)
    {
        if (!(ret->name.bytes = heap_alloc( name->length )))
        {
            free_header( ret );
            return NULL;
        }
        memcpy( ret->name.bytes, name->bytes, name->length );
        ret->name.length = name->length;
    }
    if (ns && ns->length)
    {
        if (!(ret->ns.bytes = heap_alloc( ns->length )))
        {
            free_header( ret );
            return NULL;
        }
        memcpy( ret->ns.bytes, ns->bytes, ns->length );
        ret->ns.length = ns->length;
    }
    ret->type   = type;
    ret->mapped = mapped;
    return ret;
}

static HRESULT write_standard_header( WS_XML_WRITER *writer, const WS_XML_STRING *name, WS_TYPE value_type,
                                      WS_WRITE_OPTION option, const void *value, ULONG size )
{
    static const WS_XML_STRING prefix_s = {1, (BYTE *)"s"}, prefix_a = {1, (BYTE *)"a"};
    static const WS_XML_STRING understand = {14, (BYTE *)"mustUnderstand"}, ns = {0, NULL};
    WS_XML_INT32_TEXT one = {{WS_XML_TEXT_TYPE_INT32}, 1};
    HRESULT hr;

    if ((hr = WsWriteStartElement( writer, &prefix_a, name, &ns, NULL )) != S_OK) return hr;
    if ((hr = WsWriteStartAttribute( writer, &prefix_s, &understand, &ns, FALSE, NULL )) != S_OK) return hr;
    if ((hr = WsWriteText( writer, &one.text, NULL )) != S_OK) return hr;
    if ((hr = WsWriteEndAttribute( writer, NULL )) != S_OK) return hr;
    if ((hr = WsWriteType( writer, WS_ELEMENT_CONTENT_TYPE_MAPPING, value_type, NULL, option, value, size,
                           NULL )) != S_OK) return hr;
    return WsWriteEndElement( writer, NULL );
}

static HRESULT build_standard_header( WS_HEAP *heap, WS_HEADER_TYPE type, WS_TYPE value_type,
                                      WS_WRITE_OPTION option, const void *value, ULONG size,
                                      struct header **ret )
{
    const WS_XML_STRING *name = get_header_name( type );
    struct header *header;
    WS_XML_WRITER *writer;
    WS_XML_BUFFER *buf;
    HRESULT hr;

    if (!(header = alloc_header( type, FALSE, name, NULL ))) return E_OUTOFMEMORY;

    if ((hr = WsCreateWriter( NULL, 0, &writer, NULL )) != S_OK) goto done;
    if ((hr = WsCreateXmlBuffer( heap, NULL, 0, &buf, NULL )) != S_OK) goto done;
    if ((hr = WsSetOutputToBuffer( writer, buf, NULL, 0, NULL )) != S_OK) goto done;
    if ((hr = write_standard_header( writer, name, value_type, option, value, size )) != S_OK)
        goto done;

    header->u.buf = buf;

done:
    if (hr != S_OK) free_header( header );
    else *ret = header;
    WsFreeWriter( writer );
    return hr;
}

/**************************************************************************
 *          WsSetHeader		[webservices.@]
 */
HRESULT WINAPI WsSetHeader( WS_MESSAGE *handle, WS_HEADER_TYPE type, WS_TYPE value_type,
                            WS_WRITE_OPTION option, const void *value, ULONG size, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    struct header *header;
    BOOL found = FALSE;
    HRESULT hr;
    ULONG i;

    TRACE( "%p %u %u %08x %p %u %p\n", handle, type, value_type, option, value, size, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || type < WS_ACTION_HEADER || type > WS_FAULT_TO_HEADER) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->type == type)
        {
            found = TRUE;
            break;
        }
    }

    if (!found)
    {
        if ((hr = grow_header_array( msg, msg->header_count + 1 )) != S_OK) goto done;
        i = msg->header_count;
    }

    if ((hr = build_standard_header( msg->heap, type, value_type, option, value, size, &header )) != S_OK)
        goto done;

    if (!found) msg->header_count++;
    else free_header( msg->header[i] );

    msg->header[i] = header;
    hr = write_envelope( msg );

done:
    LeaveCriticalSection( &msg->cs );
    return hr;
}

static void remove_header( struct msg *msg, ULONG i )
{
    free_header( msg->header[i] );
    memmove( &msg->header[i], &msg->header[i + 1], (msg->header_count - i - 1) * sizeof(struct header *) );
    msg->header_count--;
}

/**************************************************************************
 *          WsRemoveHeader		[webservices.@]
 */
HRESULT WINAPI WsRemoveHeader( WS_MESSAGE *handle, WS_HEADER_TYPE type, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    BOOL removed = FALSE;
    HRESULT hr = S_OK;
    ULONG i;

    TRACE( "%p %u %p\n", handle, type, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if (type < WS_ACTION_HEADER || type > WS_FAULT_TO_HEADER)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->type == type)
        {
            remove_header( msg, i );
            removed = TRUE;
            break;
        }
    }

    if (removed) hr = write_envelope( msg );

    LeaveCriticalSection( &msg->cs );
    return hr;
}

static HRESULT build_mapped_header( const WS_XML_STRING *name, WS_TYPE type, WS_WRITE_OPTION option,
                                    const void *value, ULONG size, struct header **ret )
{
    struct header *header;

    if (!(header = alloc_header( 0, TRUE, name, NULL ))) return E_OUTOFMEMORY;
    switch (type)
    {
    case WS_WSZ_TYPE:
    {
        int len;
        const WCHAR *src;

        if (option != WS_WRITE_REQUIRED_POINTER || size != sizeof(WCHAR *))
        {
            free_header( header );
            return E_INVALIDARG;
        }
        src = *(const WCHAR **)value;
        len = WideCharToMultiByte( CP_UTF8, 0, src, -1, NULL, 0, NULL, NULL ) - 1;
        if (!(header->u.text = alloc_xml_string( NULL, len )))
        {
            free_header( header );
            return E_OUTOFMEMORY;
        }
        WideCharToMultiByte( CP_UTF8, 0, src, -1, (char *)header->u.text->bytes, len, NULL, NULL );
        break;
    }
    case WS_XML_STRING_TYPE:
    {
        const WS_XML_STRING *str = value;

        if (option != WS_WRITE_REQUIRED_VALUE)
        {
            FIXME( "unhandled write option %u\n", option );
            free_header( header );
            return E_NOTIMPL;
        }
        if (size != sizeof(*str))
        {
            free_header( header );
            return E_INVALIDARG;
        }
        if (!(header->u.text = alloc_xml_string( NULL, str->length )))
        {
            free_header( header );
            return E_OUTOFMEMORY;
        }
        memcpy( header->u.text->bytes, str->bytes, str->length );
        break;
    }
    case WS_STRING_TYPE:
    {
        int len;
        const WS_STRING *str = value;

        if (option != WS_WRITE_REQUIRED_VALUE)
        {
            FIXME( "unhandled write option %u\n", option );
            free_header( header );
            return E_NOTIMPL;
        }
        if (size != sizeof(*str))
        {
            free_header( header );
            return E_INVALIDARG;
        }
        len = WideCharToMultiByte( CP_UTF8, 0, str->chars, str->length, NULL, 0, NULL, NULL );
        if (!(header->u.text = alloc_xml_string( NULL, len )))
        {
            free_header( header );
            return E_OUTOFMEMORY;
        }
        WideCharToMultiByte( CP_UTF8, 0, str->chars, str->length, (char *)header->u.text->bytes,
                             len, NULL, NULL );
        break;
    }
    default:
        FIXME( "unhandled type %u\n", type );
        free_header( header );
        return E_NOTIMPL;
    }

    *ret = header;
    return S_OK;
}

/**************************************************************************
 *          WsAddMappedHeader		[webservices.@]
 */
HRESULT WINAPI WsAddMappedHeader( WS_MESSAGE *handle, const WS_XML_STRING *name, WS_TYPE type,
                                  WS_WRITE_OPTION option, const void *value, ULONG size, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    struct header *header;
    BOOL found = FALSE;
    HRESULT hr;
    ULONG i;

    TRACE( "%p %s %u %08x %p %u %p\n", handle, debugstr_xmlstr(name), type, option, value, size, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || !name) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->type || !msg->header[i]->mapped) continue;
        if (WsXmlStringEquals( name, &msg->header[i]->name, NULL ) == S_OK)
        {
            found = TRUE;
            break;
        }
    }

    if (!found)
    {
        if ((hr = grow_header_array( msg, msg->header_count + 1 )) != S_OK) goto done;
        i = msg->header_count;
    }

    if ((hr = build_mapped_header( name, type, option, value, size, &header )) != S_OK) goto done;

    if (!found) msg->header_count++;
    else free_header( msg->header[i] );

    msg->header[i] = header;

done:
    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsRemoveMappedHeader		[webservices.@]
 */
HRESULT WINAPI WsRemoveMappedHeader( WS_MESSAGE *handle, const WS_XML_STRING *name, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    ULONG i;

    TRACE( "%p %s %p\n", handle, debugstr_xmlstr(name), error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || !name) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->type || !msg->header[i]->mapped) continue;
        if (WsXmlStringEquals( name, &msg->header[i]->name, NULL ) == S_OK)
        {
            remove_header( msg, i );
            break;
        }
    }

    LeaveCriticalSection( &msg->cs );
    return S_OK;
}

static HRESULT write_custom_header( WS_XML_WRITER *writer, const WS_XML_STRING *name, const WS_XML_STRING *ns,
                                    WS_TYPE type, const void *desc, WS_WRITE_OPTION option, const void *value,
                                    ULONG size )
{
    HRESULT hr;
    if ((hr = WsWriteStartElement( writer, NULL, name, ns, NULL )) != S_OK) return hr;
    if ((hr = WsWriteType( writer, WS_ELEMENT_CONTENT_TYPE_MAPPING, type, desc, option, value, size,
                           NULL )) != S_OK) return hr;
    return WsWriteEndElement( writer, NULL );
}

static HRESULT build_custom_header( WS_HEAP *heap, const WS_XML_STRING *name, const WS_XML_STRING *ns,
                                    WS_TYPE type, const void *desc, WS_WRITE_OPTION option, const void *value,
                                    ULONG size, struct header **ret )
{
    struct header *header;
    WS_XML_WRITER *writer;
    WS_XML_BUFFER *buf;
    HRESULT hr;

    if (!(header = alloc_header( 0, FALSE, name, ns ))) return E_OUTOFMEMORY;

    if ((hr = WsCreateWriter( NULL, 0, &writer, NULL )) != S_OK) goto done;
    if ((hr = WsCreateXmlBuffer( heap, NULL, 0, &buf, NULL )) != S_OK) goto done;
    if ((hr = WsSetOutputToBuffer( writer, buf, NULL, 0, NULL )) != S_OK) goto done;
    if ((hr = write_custom_header( writer, name, ns, type, desc, option, value, size )) != S_OK) goto done;

    header->u.buf = buf;

done:
    if (hr != S_OK) free_header( header );
    else *ret = header;
    WsFreeWriter( writer );
    return hr;
}

/**************************************************************************
 *          WsAddCustomHeader		[webservices.@]
 */
HRESULT WINAPI WsAddCustomHeader( WS_MESSAGE *handle, const WS_ELEMENT_DESCRIPTION *desc, WS_WRITE_OPTION option,
                                  const void *value, ULONG size, ULONG attrs, WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    struct header *header;
    HRESULT hr;

    TRACE( "%p %p %08x %p %u %08x %p\n", handle, desc, option, value, size, attrs, error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || !desc) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    if ((hr = grow_header_array( msg, msg->header_count + 1 )) != S_OK) goto done;
    if ((hr = build_custom_header( msg->heap, desc->elementLocalName, desc->elementNs, desc->type,
                                   desc->typeDescription, option, value, size, &header )) != S_OK) goto done;
    msg->header[msg->header_count++] = header;
    hr = write_envelope( msg );

done:
    LeaveCriticalSection( &msg->cs );
    return hr;
}

/**************************************************************************
 *          WsRemoveCustomHeader		[webservices.@]
 */
HRESULT WINAPI WsRemoveCustomHeader( WS_MESSAGE *handle, const WS_XML_STRING *name, const WS_XML_STRING *ns,
                                     WS_ERROR *error )
{
    struct msg *msg = (struct msg *)handle;
    BOOL removed = FALSE;
    HRESULT hr = S_OK;
    ULONG i;

    TRACE( "%p %s %s %p\n", handle, debugstr_xmlstr(name), debugstr_xmlstr(ns), error );
    if (error) FIXME( "ignoring error parameter\n" );

    if (!msg || !name || !ns) return E_INVALIDARG;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (msg->state < WS_MESSAGE_STATE_INITIALIZED)
    {
        LeaveCriticalSection( &msg->cs );
        return WS_E_INVALID_OPERATION;
    }

    for (i = 0; i < msg->header_count; i++)
    {
        if (msg->header[i]->type || msg->header[i]->mapped) continue;
        if (WsXmlStringEquals( name, &msg->header[i]->name, NULL ) == S_OK &&
            WsXmlStringEquals( ns, &msg->header[i]->ns, NULL ) == S_OK)
        {
            remove_header( msg, i );
            removed = TRUE;
            i--;
        }
    }

    if (removed) hr = write_envelope( msg );

    LeaveCriticalSection( &msg->cs );
    return hr;
}

static WCHAR *build_http_header( const WCHAR *name, const WCHAR *value, ULONG *ret_len )
{
    static const WCHAR fmtW[] = {'%','s',':',' ','%','s',0};
    WCHAR *ret = heap_alloc( (strlenW(name) + strlenW(value) + 3) * sizeof(WCHAR) );
    if (ret) *ret_len = sprintfW( ret, fmtW, name, value );
    return ret;
}

static inline HRESULT insert_http_header( HINTERNET req, const WCHAR *header, ULONG len, ULONG flags )
{
    if (WinHttpAddRequestHeaders( req, header, len, flags )) return S_OK;
    return HRESULT_FROM_WIN32( GetLastError() );
}

HRESULT message_insert_http_headers( WS_MESSAGE *handle, HINTERNET req )
{
    static const WCHAR contenttypeW[] =
        {'C','o','n','t','e','n','t','-','T','y','p','e',0};
    static const WCHAR soapxmlW[] =
        {'a','p','p','l','i','c','a','t','i','o','n','/','s','o','a','p','+','x','m','l',0};
    static const WCHAR textxmlW[] =
        {'t','e','x','t','/','x','m','l',0};
    static const WCHAR charsetW[] =
        {'c','h','a','r','s','e','t','=','u','t','f','-','8',0};
    struct msg *msg = (struct msg *)handle;
    HRESULT hr = E_OUTOFMEMORY;
    WCHAR *header = NULL, *buf;
    ULONG len;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    switch (msg->version_env)
    {
    case WS_ENVELOPE_VERSION_SOAP_1_1:
        header = build_http_header( contenttypeW, textxmlW, &len );
        break;

    case WS_ENVELOPE_VERSION_SOAP_1_2:
        header = build_http_header( contenttypeW, soapxmlW, &len );
        break;

    default:
        FIXME( "unhandled envelope version %u\n", msg->version_env );
        hr = E_NOTIMPL;
    }
    if (!header) goto done;

    if ((hr = insert_http_header( req, header, len, WINHTTP_ADDREQ_FLAG_ADD )) != S_OK) goto done;
    heap_free( header );

    hr = E_OUTOFMEMORY;
    if (!(header = build_http_header( contenttypeW, charsetW, &len ))) goto done;
    if ((hr = insert_http_header( req, header, len, WINHTTP_ADDREQ_FLAG_COALESCE_WITH_SEMICOLON )) != S_OK)
        goto done;
    heap_free( header );
    header = NULL;

    switch (msg->version_env)
    {
    case WS_ENVELOPE_VERSION_SOAP_1_1:
    {
        static const WCHAR soapactionW[] = {'S','O','A','P','A','c','t','i','o','n',0};

        if (!(len = msg->action.length)) break;

        hr = E_OUTOFMEMORY;
        if (!(buf = heap_alloc( (len + 3) * sizeof(WCHAR) ))) goto done;
        buf[0] = '"';
        memcpy( buf + 1, msg->action.chars, len * sizeof(WCHAR) );
        buf[len + 1] = '"';
        buf[len + 2] = 0;

        header = build_http_header( soapactionW, buf, &len );
        heap_free( buf );
        if (!header) goto done;

        hr = insert_http_header( req, header, len, WINHTTP_ADDREQ_FLAG_ADD );
        break;
    }
    case WS_ENVELOPE_VERSION_SOAP_1_2:
    {
        static const WCHAR actionW[] = {'a','c','t','i','o','n','=','"'};
        ULONG len_action = sizeof(actionW)/sizeof(actionW[0]);

        if (!(len = msg->action.length)) break;

        hr = E_OUTOFMEMORY;
        if (!(buf = heap_alloc( (len + len_action + 2) * sizeof(WCHAR) ))) goto done;
        memcpy( buf, actionW, len_action * sizeof(WCHAR) );
        memcpy( buf + len_action, msg->action.chars, len * sizeof(WCHAR) );
        len += len_action;
        buf[len++] = '"';
        buf[len] = 0;

        header = build_http_header( contenttypeW, buf, &len );
        heap_free( buf );
        if (!header) goto done;

        hr = insert_http_header( req, header, len, WINHTTP_ADDREQ_FLAG_COALESCE_WITH_SEMICOLON );
        break;
    }
    default:
        FIXME( "unhandled envelope version %u\n", msg->version_env );
        hr = E_NOTIMPL;
    }

done:
    heap_free( header );
    LeaveCriticalSection( &msg->cs );
    return hr;
}

void message_set_send_context( WS_MESSAGE *handle, const WS_PROXY_MESSAGE_CALLBACK_CONTEXT *ctx )
{
    struct msg *msg = (struct msg *)handle;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return;
    }

    msg->ctx_send.callback = ctx->callback;
    msg->ctx_send.state    = ctx->state;

    LeaveCriticalSection( &msg->cs );
}

void message_set_receive_context( WS_MESSAGE *handle, const WS_PROXY_MESSAGE_CALLBACK_CONTEXT *ctx )
{
    struct msg *msg = (struct msg *)handle;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return;
    }

    msg->ctx_receive.callback = ctx->callback;
    msg->ctx_receive.state    = ctx->state;

    LeaveCriticalSection( &msg->cs );
}

void message_do_send_callback( WS_MESSAGE *handle )
{
    struct msg *msg = (struct msg *)handle;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return;
    }

    if (msg->ctx_send.callback)
    {
        HRESULT hr;
        TRACE( "executing callback %p\n", msg->ctx_send.callback );
        hr = msg->ctx_send.callback( handle, msg->heap, msg->ctx_send.state, NULL );
        TRACE( "callback %p returned %08x\n", msg->ctx_send.callback, hr );
    }

    LeaveCriticalSection( &msg->cs );
}

void message_do_receive_callback( WS_MESSAGE *handle )
{
    struct msg *msg = (struct msg *)handle;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return;
    }

    if (msg->ctx_receive.callback)
    {
        HRESULT hr;
        TRACE( "executing callback %p\n", msg->ctx_receive.callback );
        hr = msg->ctx_receive.callback( handle, msg->heap, msg->ctx_receive.state, NULL );
        TRACE( "callback %p returned %08x\n", msg->ctx_receive.callback, hr );
    }

    LeaveCriticalSection( &msg->cs );
}

HRESULT message_set_action( WS_MESSAGE *handle, const WS_XML_STRING *action )
{
    struct msg *msg = (struct msg *)handle;
    HRESULT hr = S_OK;

    EnterCriticalSection( &msg->cs );

    if (msg->magic != MSG_MAGIC)
    {
        LeaveCriticalSection( &msg->cs );
        return E_INVALIDARG;
    }

    if (!action || !action->length)
    {
        heap_free( msg->action.chars );
        msg->action.chars  = NULL;
        msg->action.length = 0;
    }
    else
    {
        WCHAR *chars;
        int len = MultiByteToWideChar( CP_UTF8, 0, (char *)action->bytes, action->length, NULL, 0 );
        if (!(chars = heap_alloc( len * sizeof(WCHAR) ))) hr = E_OUTOFMEMORY;
        else
        {
            MultiByteToWideChar( CP_UTF8, 0, (char *)action->bytes, action->length, chars, len );
            heap_free( msg->action.chars );
            msg->action.chars  = chars;
            msg->action.length = len;
        }
    }

    LeaveCriticalSection( &msg->cs );
    return hr;
}
