X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=netatalk.git;a=blobdiff_plain;f=libatalk%2Fadouble%2Fad_read.c;h=17c2361faa99a775fef26c000bfb1ff82a8b2675;hp=b286f5561bd97a100d71d9733c473fcc24209364;hb=2bf71d3ccf20c072bc67a9d075b6ac8b0798021e;hpb=31843674b7bd32eabcce3a1ad6159b4f94921f79

diff --git a/libatalk/adouble/ad_read.c b/libatalk/adouble/ad_read.c
index b286f556..17c2361f 100644
--- a/libatalk/adouble/ad_read.c
+++ b/libatalk/adouble/ad_read.c
@@ -1,4 +1,6 @@
 /*
+ * $Id: ad_read.c,v 1.10 2010-02-10 14:05:37 franklahm Exp $
+ *
  * Copyright (c) 1990,1991 Regents of The University of Michigan.
  * All Rights Reserved.
  *
@@ -12,91 +14,95 @@
  * permission. This software is supplied as is without expressed or
  * implied warranties of any kind.
  *
- *	Research Systems Unix Group
- *	The University of Michigan
- *	c/o Mike Clark
- *	535 W. William Street
- *	Ann Arbor, Michigan
- *	+1-313-763-0525
- *	netatalk@itd.umich.edu
+ *  Research Systems Unix Group
+ *  The University of Michigan
+ *  c/o Mike Clark
+ *  535 W. William Street
+ *  Ann Arbor, Michigan
+ *  +1-313-763-0525
+ *  netatalk@itd.umich.edu
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <atalk/adouble.h>
 #include <string.h>
-#include <sys/types.h>
 #include <sys/param.h>
-#include <atalk/adouble.h>
-#include <unistd.h>
 
 #ifndef MIN
-#define MIN(a,b)	((a)<(b)?(a):(b))
+#define MIN(a,b)    ((a)<(b)?(a):(b))
+#endif /* ! MIN */
+
+ssize_t adf_pread(struct ad_fd *ad_fd, void *buf, size_t count, off_t offset)
+{
+    ssize_t     cc;
+
+#ifndef  HAVE_PREAD
+    if ( ad_fd->adf_off != offset ) {
+        if ( lseek( ad_fd->adf_fd, offset, SEEK_SET ) < 0 ) {
+            return -1;
+        }
+        ad_fd->adf_off = offset;
+    }
+    if (( cc = read( ad_fd->adf_fd, buf, count )) < 0 ) {
+        return -1;
+    }
+    ad_fd->adf_off += cc;
+#else
+    cc = pread(ad_fd->adf_fd, buf, count, offset );
 #endif
+    return cc;
+}
 
-/* XXX: this would probably benefit from pread. 
- *      locks have to be checked before each stream of consecutive 
+/* XXX: locks have to be checked before each stream of consecutive
  *      ad_reads to prevent a denial in the middle from causing
  *      problems. */
-ssize_t ad_read( ad, eid, off, buf, buflen)
-    struct adouble	*ad;
-    const u_int32_t 	eid;
-    off_t               off;
-    char		*buf;
-    const size_t	buflen;
+ssize_t ad_read( struct adouble *ad, const u_int32_t eid, off_t off, char *buf, const size_t buflen)
 {
-    ssize_t		cc;
+    ssize_t     cc;
 
     /* We're either reading the data fork (and thus the data file)
      * or we're reading anything else (and thus the header file). */
     if ( eid == ADEID_DFORK ) {
-	if ( ad->ad_df.adf_off != off ) {
-	    if ( lseek( ad->ad_df.adf_fd, (off_t) off, SEEK_SET ) < 0 ) {
-		return( -1 );
-	    }
-	    ad->ad_df.adf_off = off;
-	}
-	if (( cc = read( ad->ad_df.adf_fd, buf, buflen )) < 0 ) {
-	    return( -1 );
-	}
-	ad->ad_df.adf_off += cc;
+        if (ad->ad_data_fork.adf_syml !=0 ) {
+            /* It's a symlink, we already have the target in adf_syml */
+            cc = strlen(ad->ad_data_fork.adf_syml);
+            if (buflen < cc)
+                /* Request buffersize is too small, force AFPERR_PARAM */
+                return -1;
+            memcpy(buf, ad->ad_data_fork.adf_syml, cc);
+        } else {
+            cc = adf_pread(&ad->ad_data_fork, buf, buflen, off);
+        }
     } else {
-        cc = ad->ad_eid[eid].ade_off + off;
+        off_t r_off;
 
-#ifdef USE_MMAPPED_HEADERS
-	if (eid != ADEID_RFORK) {
-	  memcpy(buf, ad->ad_data + cc, buflen);
-	  cc = buflen;
-	  goto ad_read_done;
-	}
-#endif	
-	if ( ad->ad_hf.adf_off != cc ) {
-	  if ( lseek( ad->ad_hf.adf_fd, (off_t) cc, SEEK_SET ) < 0 ) {
-	      return( -1 );
-	  }
-	  ad->ad_hf.adf_off = cc;
-	}
-	  
-	if (( cc = read( ad->ad_hf.adf_fd, buf, buflen )) < 0 ) {
-	  return( -1 );
-	}
-	  
-#ifndef USE_MMAPPED_HEADERS
-	/*
-	 * We've just read in bytes from the disk that we read earlier
-	 * into ad_data. If we're going to write this buffer out later,
-	 * we need to update ad_data.
-	 */
-	if (ad->ad_hf.adf_off < ad_getentryoff(ad, ADEID_RFORK)) {
-	    if ( ad->ad_hf.adf_flags & O_RDWR ) {
-	      memcpy(buf, ad->ad_data + ad->ad_hf.adf_off,
-		     MIN(sizeof( ad->ad_data ) - ad->ad_hf.adf_off, cc));
-	    } else {
-	      memcpy(ad->ad_data + ad->ad_hf.adf_off, buf,
-		     MIN(sizeof( ad->ad_data ) - ad->ad_hf.adf_off, cc));
-	    }
-	}
-	ad->ad_hf.adf_off += cc;
-#else
-ad_read_done:
-#endif
+        if ( ad_reso_fileno( ad ) == -1 ) {
+            /* resource fork is not open ( cf etc/afp/fork.c) */
+            return 0;
+        }
+        r_off = ad_getentryoff(ad, eid) + off;
+
+        if (( cc = adf_pread( &ad->ad_resource_fork, buf, buflen, r_off )) < 0 ) {
+            return( -1 );
+        }
+        /*
+         * We've just read in bytes from the disk that we read earlier
+         * into ad_data. If we're going to write this buffer out later,
+         * we need to update ad_data.
+         * FIXME : always false?
+         */
+        if (r_off < ad_getentryoff(ad, ADEID_RFORK)) {
+            if ( ad->ad_resource_fork.adf_flags & O_RDWR ) {
+                memcpy(buf, ad->ad_data + r_off,
+                       MIN(sizeof( ad->ad_data ) - r_off, cc));
+            } else {
+                memcpy(ad->ad_data + r_off, buf,
+                       MIN(sizeof( ad->ad_data ) - r_off, cc));
+            }
+        }
     }
 
     return( cc );