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/* $Id:$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
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 <string.h>
#include <g3d/stream.h>
typedef struct {
gsize size;
goffset offset;
guint8 *buffer;
gboolean free_buffer;
} G3DStreamBuffer;
static gsize g3d_stream_buffer_read(gpointer ptr, gsize size, gpointer data)
{
G3DStreamBuffer *sbuf = (G3DStreamBuffer *)data;
guint8 *outbufp = (guint8 *)ptr;
gsize max_size;
max_size = MIN(sbuf->size - sbuf->offset, size);
memcpy(outbufp, sbuf->buffer + sbuf->offset, max_size);
sbuf->offset += max_size;
return max_size;
}
static gint g3d_stream_buffer_seek(gpointer data, goffset offset,
GSeekType whence)
{
G3DStreamBuffer *sbuf = (G3DStreamBuffer *)data;
switch(whence) {
case G_SEEK_SET:
if((offset >= sbuf->size) || (offset < 0))
return -1;
sbuf->offset = offset;
break;
case G_SEEK_CUR:
if(((sbuf->offset + offset) >= sbuf->size) ||
((sbuf->offset + offset) < 0))
return -1;
sbuf->offset += offset;
break;
case G_SEEK_END:
if(((sbuf->size - 1 + offset) >= sbuf->size) ||
((sbuf->size - 1 + offset) < 0))
return -1;
sbuf->offset = sbuf->size - 1 + offset;
break;
}
return 0;
}
static goffset g3d_stream_buffer_tell(gpointer data)
{
G3DStreamBuffer *sbuf = (G3DStreamBuffer *)data;
return sbuf->offset;
}
static goffset g3d_stream_buffer_size(gpointer data)
{
G3DStreamBuffer *sbuf = (G3DStreamBuffer *)data;
return sbuf->size;
}
static gboolean g3d_stream_buffer_eof(gpointer data)
{
G3DStreamBuffer *sbuf = (G3DStreamBuffer *)data;
return (sbuf->offset >= sbuf->size);
}
static gint g3d_stream_buffer_close(gpointer data)
{
G3DStreamBuffer *sbuf = (G3DStreamBuffer *)data;
if(sbuf->free_buffer)
g_free(sbuf->buffer);
g_free(sbuf);
return 0;
}
EAPI
G3DStream *g3d_stream_from_buffer(guint8 *buffer, gsize size,
const gchar *title, gboolean free_buffer)
{
G3DStream *stream;
G3DStreamBuffer *sbuf;
guint32 flags = 0;
gchar *uri;
unsigned int usize = ((unsigned int)size);
sbuf = g_new0(G3DStreamBuffer, 1);
sbuf->buffer = buffer;
sbuf->size = size;
sbuf->free_buffer = free_buffer;
flags |= (1 << G3D_STREAM_SEEKABLE) | (1 << G3D_STREAM_READABLE);
uri = g_strdup_printf("buffer://0x%8p:%u/%s", buffer, usize,
(title ? title : "unnamed"));
stream = g3d_stream_new_custom(flags, uri,
g3d_stream_buffer_read,
NULL /* use generic implementation of *_read_line */,
g3d_stream_buffer_seek, g3d_stream_buffer_tell,
g3d_stream_buffer_size, g3d_stream_buffer_eof,
g3d_stream_buffer_close, sbuf, NULL);
g_free(uri);
return stream;
}
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