1 files changed, 99 insertions, 0 deletions
diff --git a/imap/src/osdep/dos/fdstring.c b/imap/src/osdep/dos/fdstring.c
new file mode 100644
index 00000000..7a491f7d
--- /dev/null
+++ b/imap/src/osdep/dos/fdstring.c
@@ -0,0 +1,99 @@
+/* ========================================================================
+ * Copyright 1988-2007 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 
+ * ========================================================================
+ */
+
+/*
+ * Program:	File descriptor string routines
+ *
+ * Author:	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *		Internet: MRC@CAC.Washington.EDU
+ *
+ * Date:	15 April 1997
+ * Last Edited:	4 April 2007
+ */
+
+#include "mail.h"
+#include "osdep.h"
+#include "misc.h"
+#include "fdstring.h"
+
+/* String driver for fd stringstructs */
+
+static void fd_string_init (STRING *s,void *data,unsigned long size);
+static char fd_string_next (STRING *s);
+static void fd_string_setpos (STRING *s,unsigned long i);
+
+STRINGDRIVER fd_string = {
+  fd_string_init,		/* initialize string structure */
+  fd_string_next,		/* get next byte in string structure */
+  fd_string_setpos		/* set position in string structure */
+};
+
+
+/* Initialize string structure for fd stringstruct
+ * Accepts: string structure
+ *	    pointer to string
+ *	    size of string
+ */
+
+static void fd_string_init (STRING *s,void *data,unsigned long size)
+{
+  FDDATA *d = (FDDATA *) data;
+				/* note fd */
+  s->data = (void *) (unsigned long) d->fd;
+  s->data1 = d->pos;		/* note file offset */
+  s->size = size;		/* note size */
+  s->curpos = s->chunk = d->chunk;
+  s->chunksize = (unsigned long) d->chunksize;
+  s->offset = 0;		/* initial position */
+				/* and size of data */
+  s->cursize = min (s->chunksize,size);
+				/* move to that position in the file */
+  lseek (d->fd,d->pos,L_SET);
+  read (d->fd,s->chunk,(size_t) s->cursize);
+}
+
+/* Get next character from fd stringstruct
+ * Accepts: string structure
+ * Returns: character, string structure chunk refreshed
+ */
+
+static char fd_string_next (STRING *s)
+{
+  char c = *s->curpos++;	/* get next byte */
+  SETPOS (s,GETPOS (s));	/* move to next chunk */
+  return c;			/* return the byte */
+}
+
+
+/* Set string pointer position for fd stringstruct
+ * Accepts: string structure
+ *	    new position
+ */
+
+static void fd_string_setpos (STRING *s,unsigned long i)
+{
+  if (i > s->size) i = s->size;	/* don't permit setting beyond EOF */
+  s->offset = i;		/* set new offset */
+  s->curpos = s->chunk;		/* reset position */
+				/* set size of data */
+  if (s->cursize = min (s->chunksize,SIZE (s))) {
+				/* move to that position in the file */
+    lseek ((long) s->data,s->data1 + s->offset,L_SET);
+    read ((long) s->data,s->curpos,(size_t) s->cursize);
+  }
+}