New AAIP variable isofs.nt records name truncation parameters.

doc/susp_aaip_isofs_names.txt

@@ -8,7 +8,9 @@
 
 
 The following names are defined for AAIP namespace "isofs." as mentioned in
-specification of AAIP :
+specification of AAIP. Unless explicitly stated otherwise, numbers with
+names like *_LEN are 8 bit unsigned integers, those with *_BYTES are 32 bit
+unsigned integers.
 
 -------------------------------------------------------------------------------
 
@@ -22,7 +24,7 @@ Purpose:
       END is also the block address of the start of the checksum recording
       area in the image.
       See also isofs.cx .
-      This attribute shall eventually be attached to the root directory entry
+      This attribute shall be attached to the root directory entry
       and be global for the whole image.
 
 Format of Value:
@@ -65,8 +67,8 @@ Purpose:
       Records the name of the character set that was used as output character
       set when writing the RRIP name tree of the ISO 9660 image. It shall be
       suitable as parameter for function iconv_open(3).
-      This attribute shall eventually be attached to the root directory entry
+      This attribute shall be attached to the root directory entry and be
-      and be global for the whole image.
+      global for the whole image.
 
 Format of Value:
       Shall hold the character set name without terminating 0-byte.
@@ -107,6 +109,7 @@ Name:
 Purpose:
       Records .st_dev and .st_ino of struct stat of the file source in the
       local filesystem. See man 2 stat.
+      Both values may be unsigned integers up to 255 bytes.
 
 Format of Value:
       DEV_LEN | DEV_BYTES | INO_LEN | INO_BYTES
@@ -172,6 +175,26 @@ Registered:
 
 -------------------------------------------------------------------------------
 
+Name:
+      isofs.nt
+
+Purpose:
+      Records the name truncation mode and the truncation length for Rock Ridge
+      names. See iso_image_set_truncate_mode() in libisofs.h.
+      This attribute shall be attached to the root directory entry and be
+      global for the whole image.
+
+Format of Value:
+      MODE_LEN | MODE_BYTES | LENGTH_LEN | LENGTH_BYTES
+
+Example:
+      { 1, 1, 1, 255 }
+
+Registered:
+      24 Sep 2015 by Thomas Schmitt for libisofs.
+
+-------------------------------------------------------------------------------
+
 Name:
       isofs.st
 
@@ -183,7 +206,7 @@ Purpose:
       The RRIP timestamps have a blind second during which a change after
       node registration would not be recognizable for incremental backups
       which are based in "isofs.di" rather than on content comparison.
-      This attribute shall eventually be attached to the root directory entry
+      This attribute shall be attached to the root directory entry
       and be global for the whole image.
 
 Format of Value:

libisofs/ecma119.c

@@ -2536,6 +2536,12 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *in_opts, Ecma119Image **img)
     break;
        }
 
+    ret = iso_root_set_isofsnt((IsoNode *) (src->root),
+                               (uint32_t) src->truncate_mode,
+                               (uint32_t) src->truncate_length, 0);
+    if (ret < 0)
+       goto target_cleanup;
+
     /*
      * 2. Based on those options, create needed writers: iso, joliet...
      * Each writer inits its structures and stores needed info into

libisofs/fs_image.c

@@ -310,6 +310,12 @@ typedef struct
     int truncate_length;
     unsigned int ecma119_map : 2;
 
+    /**
+     * Values read from isofs.nt (isofsnt_truncate_mode == -1) means none read.
+     */
+    int isofsnt_truncate_mode;
+    int isofsnt_truncate_length;
+
     /** Whether AAIP info shall be loaded if it is present.
      *  1 = yes , 0 = no
      */
@@ -1445,12 +1451,16 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
     unsigned char *aa_string = NULL;
     size_t aa_size = 0, aa_len = 0, prev_field = 0;
     int aa_done = 0;
-    char *cs_value = NULL;
+    char *attr_value = NULL;
-    size_t cs_value_length = 0;
+    size_t attr_value_length = 0;
     char *msg = NULL;
     uint8_t *buffer = NULL;
     char *cpt;
 
+    int len;
+    uint32_t truncate_mode, truncate_length;
+    char *rpt;
+
     int has_px = 0;
 
 #ifdef Libisofs_with_zliB
@@ -1841,27 +1851,40 @@ if (name != NULL && !namecont) {
             goto ex;
         }
 
-        if ((flag & 1)  && aa_string != NULL) {
+        if (fsdata->aaip_load && (flag & 1)  && aa_string != NULL) {
             ret = iso_aa_lookup_attr(aa_string, "isofs.cs",
-                                     &cs_value_length, &cs_value, 0);
+                                     &attr_value_length, &attr_value, 0);
             if (ret == 1) {
                 LIBISO_FREE_MEM(msg);
                 LIBISO_ALLOC_MEM(msg, char, 160);
                 if (fsdata->auto_input_charset & 1) {
                     if (fsdata->input_charset != NULL)
                         free(fsdata->input_charset);
-                    fsdata->input_charset = cs_value;
+                    fsdata->input_charset = attr_value;
                     sprintf(msg,
                          "Learned from ISO image: input character set '%.80s'",
-                         cs_value);
+                         attr_value);
                 } else {
                     sprintf(msg,
                            "Character set name recorded in ISO image: '%.80s'",
-                           cs_value);
+                           attr_value);
-                    free(cs_value);
+                    free(attr_value);
                 }
                 iso_msgs_submit(0, msg, 0, "NOTE", 0);
-                cs_value = NULL;
+                attr_value = NULL;
+            }
+
+            ret = iso_aa_lookup_attr(aa_string, "isofs.nt",
+                                     &attr_value_length, &attr_value, 0);
+            if (ret == 1) {
+                rpt = attr_value;
+                iso_util_decode_len_bytes(&truncate_mode, rpt, &len,
+                                    attr_value_length - (rpt - attr_value), 0);
+                rpt += len + 1;
+                iso_util_decode_len_bytes(&truncate_length, rpt, &len,
+                                    attr_value_length - (rpt - attr_value), 0);
+                fsdata->isofsnt_truncate_mode = truncate_mode;
+                fsdata->isofsnt_truncate_length = truncate_length;
             }
         }
 
@@ -3094,6 +3117,8 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
     data->truncate_mode = opts->truncate_mode;
     data->truncate_length = opts->truncate_length;
     data->ecma119_map = opts->ecma119_map;
+    data->isofsnt_truncate_mode = -1;
+    data->isofsnt_truncate_length = 0;
 
     if (data->input_charset == NULL) {
         if (opts->input_charset != NULL) {
@@ -6007,6 +6032,16 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
         }
     }
 
+    if (data->isofsnt_truncate_mode == image->truncate_mode &&
+        image->truncate_mode == 1 &&
+        image->truncate_length > data->isofsnt_truncate_length &&
+        data->isofsnt_truncate_length >= 64) {
+        iso_msg_submit(image->id, ISO_TRUNCATE_ISOFSNT, 0,
+                "File name truncation length reduced by loaded image info: %d",
+                data->isofsnt_truncate_length);
+        image->truncate_length = data->isofsnt_truncate_length;
+    }
+
     ret = ISO_SUCCESS;
     goto import_cleanup;
 

libisofs/libisofs.h

@@ -3112,6 +3112,13 @@ void *iso_image_get_attached_data(IsoImage *image);
  * exist in the same directory. Best is to only set truncation parameters
  * once with an ISO filesystem and to never change them later.
  * 
+ * If writing of AAIP is enabled, then the mode and length are recorded in
+ * xattr "isofs.nt" of the root node.
+ * If reading of AAIP is enabled and "isofs.nt" is found, then it gets into
+ * effect if both, the truncate mode value from "isofs.nt" and the current
+ * truncate mode of the IsoImage are 1, and if the truncate length from
+ * "isofs.nt" is smaller than the current truncate length ot the IsoImage.
+ * 
  * @param image
  *      The image which shall be manipulated.
  * @param mode
@@ -8694,6 +8701,10 @@ int iso_conv_name_chars(IsoWriteOpts *opts, char *name, size_t name_len,
 /** File name had to be truncated and MD5 marked       (WARNING, HIGH, -412) */
 #define ISO_RR_NAME_TRUNCATED       0xD030FE64
 
+/** File name truncation length reduced by loaded image info
+                                                       (WARNING, HIGH, -413) */
+#define ISO_TRUNCATE_ISOFSNT        0xD030FE63
+
 
 /* Internal developer note: 
    Place new error codes directly above this comment. 

libisofs/messages.c

@@ -537,6 +537,8 @@ const char *iso_error_to_msg(int errcode)
         return "Boot image to large to buffer for writing boot info";
     case ISO_RR_NAME_TRUNCATED:
         return "File name had to be truncated and MD5 marked";
+    case ISO_TRUNCATE_ISOFSNT:
+        return "File name truncation length reduced by loaded image info";
     default:
         return "Unknown error";
     }

libisofs/node.c

@@ -2940,6 +2940,25 @@ ex:;
 }
 
 
+int iso_root_set_isofsnt(IsoNode *node, uint32_t truncate_mode,
+                         uint32_t truncate_length, int flag)
+{
+    char buffer[5 + 5], *wpt = buffer, *valuept = buffer;
+    int result_len, ret;
+    static char *names = "isofs.nt";
+    static size_t value_lengths[1];
+
+    iso_util_encode_len_bytes(truncate_mode, wpt, 0, &result_len, 0);
+    wpt += result_len;
+    iso_util_encode_len_bytes(truncate_length, wpt, 0, &result_len, 0);
+    wpt += result_len;
+    value_lengths[0] = wpt - buffer;
+    ret = iso_node_set_attrs(node, (size_t) 1,
+                             &names, value_lengths, &valuept, 2 | 8);
+    return ret;
+}
+
+
 /* API */
 int iso_file_get_md5(IsoImage *image, IsoFile *file, char md5[16], int flag)
 {

libisofs/node.h

@@ -512,6 +512,13 @@ int iso_root_get_isofsca(IsoNode *node, uint32_t *start_lba, uint32_t *end_lba,
                          int flag);
 
 
+/**
+ * Record parameters of iso_image_set_truncate_mode() by "isofs.nt".
+ */
+int iso_root_set_isofsnt(IsoNode *node, uint32_t truncate_mode,
+                         uint32_t truncate_length, int flag);
+
+
 /**
  * Copy the xinfo list from one node to the another.
  */