/* -*- mode: C; c-basic-offset: 4 -*- */
#include <stdlib.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include <libgnomevfs/gnome-vfs.h>

static unsigned long
vfs_stream_read(FT_Stream stream,
		unsigned long offset,
		unsigned char *buffer,
		unsigned long count)
{
    GnomeVFSHandle *handle = (GnomeVFSHandle *)stream->descriptor.pointer;
    GnomeVFSFileSize bytes_read = 0;

    if (gnome_vfs_seek(handle, GNOME_VFS_SEEK_START, offset) != GNOME_VFS_OK)
	return 0;
    if (count > 0) {
	if (gnome_vfs_read(handle, buffer, count, &bytes_read) != GNOME_VFS_OK)
	    return 0;
    }
    return bytes_read;
}

static void
vfs_stream_close(FT_Stream stream)
{
    GnomeVFSHandle *handle = (GnomeVFSHandle *)stream->descriptor.pointer;

    g_message("closing handle");
    if (!handle)
	return;
    gnome_vfs_close(handle);

    stream->descriptor.pointer = NULL;
    stream->size               = 0;
    stream->base               = 0;    
}

static FT_Error
vfs_stream_open(FT_Stream stream,
		const char *uri)
{
    GnomeVFSHandle *handle;
    GnomeVFSFileInfo *finfo;

    if (!stream)
	return FT_Err_Invalid_Stream_Handle;

    if (gnome_vfs_open(&handle, uri,
	       GNOME_VFS_OPEN_READ | GNOME_VFS_OPEN_RANDOM) != GNOME_VFS_OK) {
	g_message("could not open URI");
	return FT_Err_Cannot_Open_Resource;
    }

    finfo = gnome_vfs_file_info_new();
    if (gnome_vfs_get_file_info_from_handle(handle, finfo,0) != GNOME_VFS_OK) {
	g_warning("could not get file info");
	gnome_vfs_file_info_unref(finfo);
	gnome_vfs_close(handle);
	return FT_Err_Cannot_Open_Resource;
    }

    if ((finfo->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_SIZE) == 0) {
	g_warning("file info did not include file size");
	gnome_vfs_file_info_unref(finfo);
	gnome_vfs_close(handle);
	return FT_Err_Cannot_Open_Resource;
    }	
    stream->size = finfo->size;
    gnome_vfs_file_info_unref(finfo);

    stream->descriptor.pointer = handle;
    stream->pathname.pointer   = NULL;
    stream->pos                = 0;

    stream->read  = vfs_stream_read;
    stream->close = vfs_stream_close;

    return FT_Err_Ok;
}

/* load a typeface from a URI */
FT_Error
FT_New_URI_Face(FT_Library           library,
		const gchar*         uri,
		FT_Long              face_index,
		FT_Face             *aface)
{
    FT_Open_Args args;
    FT_Stream stream;
    FT_Error error;

    if ((stream = calloc(1, sizeof(FT_Stream))) == NULL)
	return FT_Err_Out_Of_Memory;

    error = vfs_stream_open(stream, uri);
    if (error != FT_Err_Ok) {
	free(stream);
	return error;
    }

#ifndef FT_OPEN_STREAM
#  define FT_OPEN_STREAM ft_open_stream
#endif
    args.flags  = FT_OPEN_STREAM;
    args.stream = stream;

    error = FT_Open_Face(library, &args, face_index, aface);

    if (error != FT_Err_Ok) {
	stream->close(stream);
	free(stream);
	return error;
    }

    return error;
}