*: initial commit of stripped schism stuff

Forking schism tracker's IT playback stuff into a little playback
library for embedding in demos.

1 files changed, 136 insertions, 0 deletions

diff --git a/src/include/disko.h b/src/include/disko.h
new file mode 100644
index 0000000..e7dc14c
--- /dev/null
+++ b/src/include/disko.h
@@ -0,0 +1,136 @@
+/*
+ * Schism Tracker - a cross-platform Impulse Tracker clone
+ * copyright (c) 2003-2005 Storlek <storlek@rigelseven.com>
+ * copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org>
+ * copyright (c) 2009 Storlek & Mrs. Brisby
+ * copyright (c) 2010-2012 Storlek
+ * URL: http://schismtracker.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifndef __disko_h
+#define __disko_h
+
+#include <sys/types.h>
+
+
+typedef struct disko disko_t;
+struct disko {
+	// Functions whose implementation depends on the backend in use
+	// Use disko_write et al. instead of these.
+	void (*_write)(disko_t *ds, const void *buf, size_t len);
+	void (*_putc)(disko_t *ds, int c);
+	void (*_seek)(disko_t *ds, long offset, int whence);
+	long (*_tell)(disko_t *ds);
+
+	// Temporary filename that's being written to
+	char tempname[PATH_MAX];
+
+	// Name to change it to on close (if successful)
+	char filename[PATH_MAX];
+
+	// these could be unionized
+	// file pointer (only exists for disk files)
+	FILE *file;
+	// data for memory buffers (no filename/handle)
+	uint8_t *data;
+
+	// First errno value recorded after something went wrong.
+	int error;
+
+	/* untouched by diskwriter; driver may use for anything */
+	void *userdata;
+
+	// for memory buffers
+	size_t pos, length, allocated;
+};
+
+enum {
+	DW_OK = 1,
+	DW_ERROR = 0,
+	DW_NOT_RUNNING = -1,
+};
+enum {
+	DW_SYNC_DONE = 0,
+	DW_SYNC_ERROR = -1,
+	DW_SYNC_MORE = 1,
+};
+
+/* fopen/fclose-ish writeout/finish wrapper that allocates a structure */
+disko_t *disko_open(const char *filename);
+/* Close the file. If there was no error writing the file, it is renamed
+to the name specified in disko_open; otherwise, the original file is left
+intact and the temporary file is deleted. Returns DW_OK on success,
+DW_ERROR (and sets errno) if there was a file error.
+'backup' parameter:
+	<1  don't backup
+	=1  backup to file~
+	>1  keep numbered backups to file.n~
+(the semantics of this might change later to allow finer control) */
+int disko_close(disko_t *f, int backup);
+
+/* alloc/free a memory buffer
+if free_buffer is 0, the internal buffer is left alone when deallocating,
+so that it can continue to be used later */
+disko_t *disko_memopen(void);
+int disko_memclose(disko_t *f, int free_buffer);
+
+
+/* copy a pattern into a sample */
+int disko_writeout_sample(int smpnum, int pattern, int bind);
+
+/* copy a pattern into multiple samples (split by channel,
+and writing into free slots starting at smpnum) */
+int disko_multiwrite_samples(int firstsmp, int pattern);
+
+/* Wrapper for the above that writes to the current sample,
+and with a confirmation dialog if the sample already has data */
+void song_pattern_to_sample(int pattern, int split, int bind);
+
+/* export the song to a file */
+struct save_format;
+int disko_export_song(const char *filename, const struct save_format *format);
+
+/* call periodically if (status.flags & DISKWRITER_ACTIVE) to write more stuff.
+return: DW_SYNC_*, self explanatory */
+int disko_sync(void);
+
+
+
+/* For use by the diskwriter drivers: */
+
+/* Write data to the file, as in fwrite() */
+void disko_write(disko_t *ds, const void *buf, size_t len);
+
+/* Write one character (unsigned char, cast to int) */
+void disko_putc(disko_t *ds, int c);
+
+/* Change file position. This CAN be used to seek past the end,
+but be cognizant that random data might exist in the "gap". */
+void disko_seek(disko_t *ds, long pos, int whence);
+
+/* Get the position, as set by seek */
+long disko_tell(disko_t *ds);
+
+/* Call this to signal a nonrecoverable error condition. */
+void disko_seterror(disko_t *ds, int err);
+
+/* ------------------------------------------------------------------------- */
+
+/* this call is used by audio/loadsave to send midi data */
+int _disko_writemidi(const void *data, unsigned int len, unsigned int delay);
+
+#endif
+