--- /dev/null
+/*
+ * The 3D Studio File Format Library
+ * Copyright (C) 1996-2001 by J.E. Hoffmann <je-h@gmx.net>
+ * All rights reserved.
+ *
+ * This program 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 program 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 program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: chunk.c,v 1.14 2001/07/07 19:05:30 jeh Exp $
+ */
+#define LIB3DS_EXPORT
+#include <lib3ds/chunk.h>
+#include <lib3ds/io.h>
+#include <lib3ds/chunktable.h>
+#include <string.h>
+#include <stdarg.h>
+
+
+/*#define LIB3DS_CHUNK_DEBUG*/
+/*#define LIB3DS_CHUNK_WARNING*/
+
+
+/*!
+ * \defgroup chunk Chunk Handling
+ *
+ * \author J.E. Hoffmann <je-h@gmx.net>
+ */
+
+
+static Lib3dsBool enable_dump=LIB3DS_FALSE;
+static Lib3dsBool enable_unknown=LIB3DS_FALSE;
+static char lib3ds_chunk_level[128]="";
+
+
+static void
+lib3ds_chunk_debug_enter(Lib3dsChunk *c)
+{
+ strcat(lib3ds_chunk_level, " ");
+}
+
+
+static void
+lib3ds_chunk_debug_leave(Lib3dsChunk *c)
+{
+ lib3ds_chunk_level[strlen(lib3ds_chunk_level)-2]=0;
+}
+
+
+static void
+lib3ds_chunk_debug_dump(Lib3dsChunk *c)
+{
+ if (enable_dump) {
+ printf("%s%s (0x%X) size=%lu\n",
+ lib3ds_chunk_level,
+ lib3ds_chunk_name(c->chunk),
+ c->chunk,
+ c->size
+ );
+ }
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+void
+lib3ds_chunk_enable_dump(Lib3dsBool enable, Lib3dsBool unknown)
+{
+ enable_dump=enable;
+ enable_unknown=unknown;
+}
+
+
+/*!
+ * \ingroup chunk
+ *
+ * Reads a 3d-Studio chunk header from a little endian file stream.
+ *
+ * \param c The chunk to store the data.
+ * \param f The file stream.
+ *
+ * \return True on success, False otherwise.
+ */
+Lib3dsBool
+lib3ds_chunk_read(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ ASSERT(c);
+ ASSERT(io);
+ c->cur=lib3ds_io_tell(io);
+ c->chunk=lib3ds_io_read_word(io);
+ c->size=lib3ds_io_read_dword(io);
+ c->end=c->cur+c->size;
+ c->cur+=6;
+ if (lib3ds_io_error(io) || (c->size<6)) {
+ return(LIB3DS_FALSE);
+ }
+ return(LIB3DS_TRUE);
+
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+Lib3dsBool
+lib3ds_chunk_read_start(Lib3dsChunk *c, Lib3dsWord chunk, Lib3dsIo *io)
+{
+ ASSERT(c);
+ ASSERT(io);
+ if (!lib3ds_chunk_read(c, io)) {
+ return(LIB3DS_FALSE);
+ }
+ lib3ds_chunk_debug_enter(c);
+ return((chunk==0) || (c->chunk==chunk));
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+void
+lib3ds_chunk_read_tell(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ c->cur=lib3ds_io_tell(io);
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+Lib3dsWord
+lib3ds_chunk_read_next(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ Lib3dsChunk d;
+
+ if (c->cur>=c->end) {
+ ASSERT(c->cur==c->end);
+ return(0);
+ }
+
+ lib3ds_io_seek(io, (long)c->cur, LIB3DS_SEEK_SET);
+ d.chunk=lib3ds_io_read_word(io);
+ d.size=lib3ds_io_read_dword(io);
+ lib3ds_chunk_debug_dump(&d);
+ c->cur+=d.size;
+ return(d.chunk);
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+void
+lib3ds_chunk_read_reset(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ lib3ds_io_seek(io, -6, LIB3DS_SEEK_CUR);
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+void
+lib3ds_chunk_read_end(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ lib3ds_chunk_debug_leave(c);
+ lib3ds_io_seek(io, c->end, LIB3DS_SEEK_SET);
+}
+
+
+/*!
+ * \ingroup chunk
+ *
+ * Writes a 3d-Studio chunk header into a little endian file stream.
+ *
+ * \param c The chunk to be written.
+ * \param f The file stream.
+ *
+ * \return True on success, False otherwise.
+ */
+Lib3dsBool
+lib3ds_chunk_write(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ ASSERT(c);
+ if (!lib3ds_io_write_word(io, c->chunk)) {
+ LIB3DS_ERROR_LOG;
+ return(LIB3DS_FALSE);
+ }
+ if (!lib3ds_io_write_dword(io, c->size)) {
+ LIB3DS_ERROR_LOG;
+ return(LIB3DS_FALSE);
+ }
+ return(LIB3DS_TRUE);
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+Lib3dsBool
+lib3ds_chunk_write_start(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ ASSERT(c);
+ c->size=0;
+ c->cur=lib3ds_io_tell(io);
+ if (!lib3ds_io_write_word(io, c->chunk)) {
+ return(LIB3DS_FALSE);
+ }
+ if (!lib3ds_io_write_dword(io, c->size)) {
+ return(LIB3DS_FALSE);
+ }
+ return(LIB3DS_TRUE);
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+Lib3dsBool
+lib3ds_chunk_write_end(Lib3dsChunk *c, Lib3dsIo *io)
+{
+ ASSERT(c);
+ c->size=lib3ds_io_tell(io) - c->cur;
+ lib3ds_io_seek(io, c->cur+2, LIB3DS_SEEK_SET);
+ if (!lib3ds_io_write_dword(io, c->size)) {
+ LIB3DS_ERROR_LOG;
+ return(LIB3DS_FALSE);
+ }
+
+ c->cur+=c->size;
+ lib3ds_io_seek(io, c->cur, LIB3DS_SEEK_SET);
+ if (lib3ds_io_error(io)) {
+ LIB3DS_ERROR_LOG;
+ return(LIB3DS_FALSE);
+ }
+ return(LIB3DS_TRUE);
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+const char*
+lib3ds_chunk_name(Lib3dsWord chunk)
+{
+ Lib3dsChunkTable *p;
+
+ for (p=lib3ds_chunk_table; p->name!=0; ++p) {
+ if (p->chunk==chunk) {
+ return(p->name);
+ }
+ }
+ return("***UNKNOWN***");
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+void
+lib3ds_chunk_unknown(Lib3dsWord chunk)
+{
+ if (enable_unknown) {
+ printf("%s***WARNING*** Unknown Chunk: %s (0x%X)\n",
+ lib3ds_chunk_level,
+ lib3ds_chunk_name(chunk),
+ chunk
+ );
+ }
+}
+
+
+/*!
+ * \ingroup chunk
+ */
+void
+lib3ds_chunk_dump_info(const char *format, ...)
+{
+ if (enable_dump) {
+ char s[1024];
+ va_list marker;
+
+ va_start(marker, format);
+ vsprintf(s, format, marker);
+ va_end(marker);
+
+ printf("%s%s\n", lib3ds_chunk_level, s);
+ }
+}
+
+
+
+
+
+
+
projects / summerhack / blobdiff