initially checkin

1 files changed, 120 insertions, 0 deletions

diff --git a/include/iobuf.h b/include/iobuf.h
new file mode 100644
index 000000000..328cd8da5
--- /dev/null
+++ b/include/iobuf.h
@@ -0,0 +1,120 @@
+/* iobuf.h - I/O buffer
+ *	Copyright (c) 1997 by Werner Koch (dd9jn)
+ *
+ * This file is part of G10.
+ *
+ * G10 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.
+ *
+ * G10 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 G10_IOBUF_H
+#define G10_IOBUF_H
+
+#include "types.h"
+
+
+#define DBG_IOBUF   iobuf_debug_mode
+
+
+#define IOBUFCTRL_INIT	    1
+#define IOBUFCTRL_FREE	    2
+#define IOBUFCTRL_UNDERFLOW 3
+#define IOBUFCTRL_FLUSH     4
+#define IOBUFCTRL_DESC	    5
+#define IOBUFCTRL_USER	    16
+
+typedef struct iobuf_struct *IOBUF;
+
+struct iobuf_struct {
+    int usage;		 /* 1 input , 2 output, 3 temp */
+    unsigned long nlimit;
+    unsigned long nbytes;
+    struct {
+	size_t size;   /* allocated size */
+	size_t start;  /* number of invalid bytes at the begin of the buffer */
+	size_t len;    /* currently filled to this size */
+	byte *buf;
+    } d;
+    struct {
+	size_t size;
+	size_t len;
+	char *buf;
+    } recorder;
+    int filter_eof;
+    int (*filter)( void *opaque, int control,
+		   IOBUF chain, byte *buf, size_t *len);
+    void *filter_ov;	/* value for opaque */
+    IOBUF chain;	/* next iobuf used for i/o if any (passed to filter) */
+    int no, subno;
+    const char *desc;
+};
+
+int iobuf_debug_mode;
+
+IOBUF iobuf_alloc(int usage, size_t bufsize);
+IOBUF iobuf_temp(void);
+IOBUF iobuf_open( const char *fname );
+IOBUF iobuf_create( const char *fname );
+int   iobuf_close( IOBUF iobuf );
+int   iobuf_cancel( IOBUF iobuf );
+
+int iobuf_push_filter( IOBUF a, int (*f)(void *opaque, int control,
+		       IOBUF chain, byte *buf, size_t *len), void *ov );
+int iobuf_pop_filter( IOBUF a, int (*f)(void *opaque, int control,
+		      IOBUF chain, byte *buf, size_t *len), void *ov );
+int iobuf_flush(IOBUF a);
+void iobuf_clear_eof(IOBUF a);
+
+void iobuf_set_limit( IOBUF a, unsigned long nlimit );
+
+int  iobuf_readbyte(IOBUF a);
+int  iobuf_writebyte(IOBUF a, unsigned c);
+int  iobuf_write(IOBUF a, byte *buf, unsigned buflen );
+
+int  iobuf_write_temp( IOBUF a, IOBUF temp );
+size_t iobuf_temp_to_buffer( IOBUF a, byte *buffer, size_t buflen );
+
+void iobuf_start_recorder( IOBUF a );
+void iobuf_push_recorder( IOBUF a, int c );
+char *iobuf_stop_recorder( IOBUF a, size_t *n );
+
+u32 iobuf_get_filelength( IOBUF a );
+
+void iobuf_set_block_mode( IOBUF a, size_t n );
+int  iobuf_in_block_mode( IOBUF a );
+
+/* get a byte form the iobuf; must check for eof prior to this function
+ * this function returns values in the range 0 .. 255 or -1 to indicate EOF
+ * iobuf_get_noeof() does not return -1 to indicate EOF, but masks the
+ * returned value to be in the range 0 ..255.
+ */
+#define iobuf_get(a)  \
+     (	((a)->recorder.buf || (a)->nlimit \
+	 || (a)->d.start >= (a)->d.len )?  \
+	iobuf_readbyte((a)) : ( (a)->nbytes++, (a)->d.buf[(a)->d.start++] ) )
+#define iobuf_get_noeof(a)    (iobuf_get((a))&0xff)
+
+
+/* write a byte to the iobuf and return true on write error
+ * This macro does only write the low order byte
+ */
+#define iobuf_put(a,c)	iobuf_writebyte(a,c)
+
+#define iobuf_where(a)	"[don't know]"
+#define iobuf_id(a)	((a)->no)
+
+#define iobuf_get_temp_length(a) ( (a)->d.len )
+#define iobuf_is_temp(a)	 ( (a)->usage == 3 )
+
+#endif /*G10_IOBUF_H*/