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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/types.h>
#include <g3d/stream.h>
#include <zlib.h>
typedef struct {
G3DStream *stream;
gchar *uri;
z_streamp zstream;
gsize cmp_size; /* compressed size */
gsize cmp_read; /* compressed bytes read */
goffset offset; /* offset (decompressed) */
guint8 *inbuf;
guint8 *inbufp;
guint8 *buffer;
guint8 *bufp;
gsize bufpages;
gsize bufavail;
gboolean eof;
} G3DStreamZlib;
#define G3D_Z_CHUNK_SIZE (128 * 1024)
static gsize zlib_refill_buffer(G3DStreamZlib *sz)
{
gint ret;
/* FIXME: don't read beyond inflate stream */
sz->zstream->avail_in = g3d_stream_read(sz->stream, sz->inbuf,
MIN(G3D_Z_CHUNK_SIZE, (sz->cmp_size - sz->cmp_read)));
sz->cmp_read += sz->zstream->avail_in;
sz->zstream->next_in = sz->inbuf;
#if DEBUG > 0
g_debug("ZLIB: %d bytes in input buffer", sz->zstream->avail_in);
#endif
/* clean up previous refill */
if(sz->buffer)
g_free(sz->buffer);
sz->buffer = NULL;
sz->bufp = NULL;
sz->bufpages = 0;
/* decompress */
do {
/* add an output page */
sz->buffer = g_realloc(sz->buffer, (sz->bufpages + 1) *
G3D_Z_CHUNK_SIZE * sizeof(guint8));
sz->bufp = sz->buffer + G3D_Z_CHUNK_SIZE * sz->bufpages;
sz->bufpages ++;
sz->zstream->avail_out = G3D_Z_CHUNK_SIZE;
sz->zstream->next_out = sz->bufp;
ret = inflate(sz->zstream, Z_NO_FLUSH);
switch(ret) {
case Z_STREAM_ERROR:
g_warning("stream error");
return 0;
case Z_DATA_ERROR:
case Z_MEM_ERROR:
g_warning("zlib error: %d", ret);
return 0;
}
sz->bufavail += (G3D_Z_CHUNK_SIZE - sz->zstream->avail_out);
#if DEBUG > 0
g_debug("ZLIB: %d bytes in output buffer", sz->bufavail);
#endif
} while(sz->zstream->avail_out == 0);
sz->bufp = sz->buffer;
return sz->bufavail;
}
static gsize g3d_stream_zlib_read(gpointer ptr, gsize size, gpointer data)
{
G3DStreamZlib *sz = data;
gsize n = size, nc, br = 0;
guint8 *bufp = ptr;
#if DEBUG > 3
g_debug("ZLIB: reading %d bytes...", n);
#endif
while(n > 0) {
if(sz->bufavail == 0)
zlib_refill_buffer(sz);
if(sz->bufavail == 0) {
sz->eof = TRUE;
return 0;
}
nc = MIN(n, sz->bufavail);
memcpy(bufp, sz->bufp, nc);
sz->bufp += nc;
bufp += nc;
sz->bufavail -= nc;
n -= nc;
br += nc;
sz->offset += nc;
#if DEBUG > 3
g_debug("ZLIB: copied %d bytes [%02x]", nc, ((guint8 *)ptr)[0]);
#endif
}
return br;
}
static goffset g3d_stream_zlib_tell(gpointer data)
{
G3DStreamZlib *sz = data;
return sz->offset;
}
static gboolean g3d_stream_zlib_eof(gpointer data)
{
G3DStreamZlib *sz = data;
return sz->eof;
}
static gint g3d_stream_zlib_close(gpointer data)
{
G3DStreamZlib *sz = data;
if(sz->inbuf)
g_free(sz->inbuf);
if(sz->buffer)
g_free(sz->buffer);
inflateEnd(sz->zstream);
g_free(sz->zstream);
g_free(sz->uri);
g_free(sz);
return 0;
}
/*****************************************************************************/
EAPI
G3DStream *g3d_stream_zlib_inflate_stream(G3DStream *stream, gsize cmp_size)
{
G3DStreamZlib *sz;
guint32 flags = 0;
gint ret;
sz = g_new0(G3DStreamZlib, 1);
sz->stream = stream;
sz->cmp_size = cmp_size;
sz->zstream = g_new0(z_stream, 1);
ret = inflateInit(sz->zstream);
if(ret != Z_OK) {
g_warning("stream_zlib: failed to init");
g_free(sz->zstream);
g_free(sz);
}
sz->inbuf = g_new0(guint8, G3D_Z_CHUNK_SIZE);
flags |= (1 << G3D_STREAM_READABLE);
sz->uri = g_strdup_printf("%s:gzipped@0x%08x", stream->uri,
(guint32)g3d_stream_tell(stream));
return g3d_stream_new_custom(flags, sz->uri,
g3d_stream_zlib_read, NULL /* readline */,
NULL /* seek */, g3d_stream_zlib_tell,
NULL /* size */, g3d_stream_zlib_eof,
g3d_stream_zlib_close, sz, NULL);
}
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