New API call iso_read_opts_auto_input_charset() allows to obtain

the image tree character set name from root xattr "isofs.cs".

doc/susp_aaip_isofs_names.txt

@@ -8,7 +8,7 @@
 
 
 The following names are defined for AAIP namespace "isofs." as mentioned in
-specification AAIP 1.0 :
+specification of AAIP :
 
 -------------------------------------------------------------------------------
 
@@ -34,3 +34,25 @@ Registered:
                  
 -------------------------------------------------------------------------------
 
+Name:
+      isofs.cs
+
+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
+      and be global for the whole image.
+
+Format of Value:
+      Shall hold the character set name without terminating 0-byte.
+
+Example:
+      { 'I', 'S', 'O', '-', '8', '8', '5', '9' , '-', '1' }
+
+Registered:
+      18 Mar 2009 by Thomas Schmitt for libisofs.
+                 
+-------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
+

libisofs/fs_image.c

@@ -19,6 +19,7 @@
 #include "image.h"
 #include "tree.h"
 #include "eltorito.h"
+#include "node.h"
 #include "aaip_0_2.h"
 
 #include <stdlib.h>
@@ -26,6 +27,7 @@
 #include <locale.h>
 #include <langinfo.h>
 #include <limits.h>
+#include <stdio.h>
 
 
 /**
@@ -77,6 +79,16 @@ struct iso_read_opts
      * Input charset for RR file names. NULL to use default locale charset.
      */
     char *input_charset;
+
+    /* ts A90319 */
+    /**
+     * Enable or disable methods to automatically choose an input charset.
+     * This eventually overrides input_charset.
+     *
+     * bit0= allow to set the input character set automatically from
+     *       attribute "isofs.cs" of root directory
+     */
+    int auto_input_charset;
 };
 
 /**
@@ -112,7 +124,7 @@ static int ifs_fs_open(IsoImageFilesystem *fs);
 static int ifs_fs_close(IsoImageFilesystem *fs);
 static int iso_file_source_new_ifs(IsoImageFilesystem *fs,
            IsoFileSource *parent, struct ecma119_dir_record *record,
-           IsoFileSource **src);
+           IsoFileSource **src, int falg);
 
 /** unique identifier for each image */
 unsigned int fs_dev_id = 0;
@@ -154,6 +166,16 @@ typedef struct
     char *input_charset; /**< Input charset for RR names */
     char *local_charset; /**< For RR names, will be set to the locale one */
 
+    /* ts A90319 */
+    /**
+     * Enable or disable methods to automatically choose an input charset.
+     * This eventually overrides input_charset.
+     *
+     * bit0= allow to set the input character set automatically from
+     *       attribute "isofs.cs" of root directory
+     */
+    int auto_input_charset;
+
     /**
      * Will be filled with the block lba of the extend for the root directory
      * of the hierarchy that will be read, either from the PVD (ISO, RR) or
@@ -463,7 +485,7 @@ int read_dir(ImageFileSourceData *data)
          * We pass a NULL parent instead of dir, to prevent the circular
          * reference from child to parent.
          */
-        ret = iso_file_source_new_ifs(fs, NULL, record, &child);
+        ret = iso_file_source_new_ifs(fs, NULL, record, &child, 0);
         if (ret < 0) {
             if (child) {
                 /*
@@ -1047,6 +1069,12 @@ ino_t fs_give_ino_number(IsoImageFilesystem *fs, int flag)
  * @param src
  *      if not-NULL, it points to a multi-extent file returned by a previous
  *      call to this function.
+ *
+ * ts A90320
+ * @param flag
+ *      bit0= this is the root node attribute load call
+ *            (parameter parent is not reliable for this)
+ *
  * @return
  *      2 node is still incomplete (multi-extent)
  *      1 success, 0 record ignored (not an error, can be a relocated dir),
@@ -1055,7 +1083,7 @@ ino_t fs_give_ino_number(IsoImageFilesystem *fs, int flag)
 static
 int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
                             struct ecma119_dir_record *record,
-                            IsoFileSource **src)
+                            IsoFileSource **src, int flag)
 {
     int ret;
     struct stat atts;
@@ -1077,6 +1105,10 @@ 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;
+    size_t cs_value_length = 0;
+    char msg[160];
+
 
     if (fs == NULL || fs->data == NULL || record == NULL || src == NULL) {
         return ISO_NULL_POINTER;
@@ -1298,7 +1330,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
                  * Ignore this, to prevent the hint message, if we are dealing
                  * with root node (SP is only valid in "." of root node)
                  */
-                if (parent != NULL) {
+                if (!(flag & 1)) {
                     /* notify and continue */
                     ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR, 0,
                                   "SP entry found in a directory entry other "
@@ -1310,7 +1342,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
                  * Ignore this, to prevent the hint message, if we are dealing
                  * with root node (ER is only valid in "." of root node)
                  */
-                if (parent != NULL) {
+                if (!(flag & 1)) {
                     /* notify and continue */
                     ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR, 0,
                                   "ER entry found in a directory entry other "
@@ -1375,6 +1407,28 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
             return ret;
         }
 
+        /* ts A90319 */
+        if ((flag & 1)  && aa_string != NULL) {
+            ret = iso_aa_lookup_attr(aa_string, "isofs.cs",
+                                     &cs_value_length, &cs_value, 0);
+            if (ret == 1) {
+                if (fsdata->auto_input_charset & 1) {
+                    if (fsdata->input_charset != NULL)
+                        free(fsdata->input_charset);
+                    fsdata->input_charset = cs_value;
+                    sprintf(msg,
+                         "Learned from ISO image: input character set '%.80s'",
+                         cs_value);
+                } else {
+                    sprintf(msg,
+                           "Character set name recorded in ISO image: '%.80s'",
+                           cs_value);
+                }
+                iso_msgs_submit(0, msg, 0, "NOTE", 0);
+                cs_value = NULL;
+            }
+        }
+
         /* convert name to needed charset */
         if (strcmp(fsdata->input_charset, fsdata->local_charset) && name) {
             /* we need to convert name charset */
@@ -1483,7 +1537,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
         }
 
         ret = iso_file_source_new_ifs(fs, parent, (struct ecma119_dir_record*)
-                                      buffer, src);
+                                      buffer, src, 0);
         if (ret <= 0) {
             return ret;
         }
@@ -1666,7 +1720,7 @@ int ifs_get_root(IsoFilesystem *fs, IsoFileSource **root)
     /* get root attributes from "." entry */
     *root = NULL;
     ret = iso_file_source_new_ifs((IsoImageFilesystem*)fs, NULL,
-                                   (struct ecma119_dir_record*) buffer, root);
+                                 (struct ecma119_dir_record*) buffer, root, 1);
 
     ifs_fs_close((IsoImageFilesystem*)fs);
     return ret;
@@ -2339,6 +2393,8 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
         ret = ISO_OUT_OF_MEM;
         goto fs_cleanup;
     }
+    /* ts A90319 */
+    data->auto_input_charset = opts->auto_input_charset;
 
     /* and finally return. Note that we keep the DataSource opened */
 
@@ -3078,6 +3134,15 @@ int iso_read_opts_set_input_charset(IsoReadOpts *opts, const char *charset)
     return ISO_SUCCESS;
 }
 
+int iso_read_opts_auto_input_charset(IsoReadOpts *opts, int mode)
+{
+    if (opts == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    opts->auto_input_charset = mode;
+    return ISO_SUCCESS;
+}
+
 /**
  * Destroy an IsoReadImageFeatures object obtained with iso_image_import.
  */

libisofs/libisofs.h

@@ -1162,8 +1162,8 @@ int iso_write_opts_set_iso1999(IsoWriteOpts *opts, int enable);
  * (e.g. the local POSIX filesystem) see iso_image_set_ignore_aclea().
  * For loading of this information from images see iso_read_opts_set_no_aaip().
  *
- * @param enable     1 = do not read AAIP information
+ * @param enable     1 = write AAIP information from nodes into the image
- *                   0 = read AAIP information if available
+ *                   0 = do not write AAIP information into the image
  *                   All other values are reserved.
  * @since 0.6.14
  */
@@ -1677,6 +1677,29 @@ int iso_read_opts_set_default_permissions(IsoReadOpts *opts, mode_t file_perm,
  */
 int iso_read_opts_set_input_charset(IsoReadOpts *opts, const char *charset);
 
+
+/* ts A90319 */
+#define Libisofs_has_auto_input_charseT yes
+/**
+ * Enable or disable methods to automatically choose an input charset.
+ * This eventually overrides the name set via iso_read_opts_set_input_charset()
+ *
+ * @param mode
+ *       Bitfield for control purposes:
+ *       bit0= Allow to use the input character set name which is eventually
+ *             stored in attribute "isofs.cs" of the root directory.
+ *             Applications may attach this xattr by iso_node_set_attrs() to
+ *             the root node, call iso_write_opts_set_output_charset() with the
+ *             same name and enable iso_write_opts_set_aaip() when writing
+ *             an image.
+ *       Submit any other bits with value 0.
+ *
+ * @since 0.6.18
+ *
+ */
+int iso_read_opts_auto_input_charset(IsoReadOpts *opts, int mode);
+
+
 /**
  * Import a previous session or image, for growing or modify.
  *
@@ -4394,7 +4417,7 @@ mode_t iso_node_get_perms_wo_acl(const IsoNode *node);
  * @param value_lengths
  *      Will return an arry with the lenghts of values
  * @param values
- *      Will return an array of pointers to 8-bit values
+ *      Will return an array of pointers to strings of 8-bit bytes
  * @param flag
  *      Bitfield for control purposes
  *      bit0=  obtain eventual ACLs as attribute with empty name
@@ -4434,7 +4457,7 @@ int iso_node_get_attrs(IsoNode *node, size_t *num_attrs,
  *      bit1= Do not clear the existing attribute list but merge it with
  *            the list given by this call
  *      bit2= Delete the attributes with the given names
- *      bit3= Allow non-user attributes.
+ *      bit3= Allow to affect non-user attributes.
  *            I.e. those with a non-empty name which does not begin by "user."
  *            (The empty name is always allowed and governed by bit0.) This
  *            deletes all previously existing attributes if not bit1 is set.
@@ -4806,6 +4829,11 @@ struct burn_source {
 #define Libisofs_avoid_using_allocA yes
 
 
+/* Cleanup : make call setlocale() at init time resp. never
+*/
+#define Libisofs_setlocale_in_iniT yes
+
+
 /* ---------------------------- Experiments ---------------------------- */
 
 
@@ -4840,11 +4868,7 @@ struct burn_source {
                They can print errno messages and they
                can avoid iconv() if the identical mapping is desired.
                One could install own simple conversion capabilities.
+*/
 #define Libisofs_with_iso_iconV yes
-*/
-
-/* Cleanup : make call setlocale() at init time resp. never
-*/
-#define Libisofs_setlocale_in_iniT yes
 
 #endif /*LIBISO_LIBISOFS_H_*/

libisofs/messages.c

@@ -64,9 +64,13 @@ struct libiso_msgs *libiso_msgr = NULL;
 */
 int iso_init_with_flag(int flag)
 {
+
+#ifdef Libisofs_setlocale_in_iniT
     if (! (flag & 1)) {
         iso_init_locale(0);
     }
+#endif
+
     if (libiso_msgr == NULL) {
         if (libiso_msgs_new(&libiso_msgr, 0) <= 0)
             return ISO_FATAL_ERROR;

libisofs/node.c

@@ -1375,7 +1375,6 @@ int attrs_cleanout_name(char *del_name, size_t *num_attrs, char **names,
  * AA string from where to get the attribute list.
  * All other parameter specs apply.
  */
-static
 int iso_aa_get_attrs(unsigned char *aa_string, size_t *num_attrs,
               char ***names, size_t **value_lengths, char ***values, int flag)
 {
@@ -1447,6 +1446,43 @@ ex:;
 }
 
 
+/* ts A90319 */
+/**
+ * Search given name. Eventually calloc() and copy value. Add trailing 0 byte
+ * for caller convenience.
+ *
+ * @return 1= found , 0= not found , <0 error
+ */
+int iso_aa_lookup_attr(unsigned char *aa_string, char *name,
+                       size_t *value_length, char **value, int flag)
+{
+    size_t num_attrs = 0, *value_lengths = NULL;
+    char **names = NULL, **values = NULL;
+    int i, ret = 0;
+
+    ret = iso_aa_get_attrs(aa_string, &num_attrs, &names,
+                           &value_lengths, &values, 0);
+    for (i = 0; i < num_attrs; i++) {
+        if (strcmp(names[i], name))
+    continue;
+        *value_length = value_lengths[i];
+        *value = calloc(*value_length + 1, 1);
+        if (*value == NULL) {
+            ret = ISO_OUT_OF_MEM;
+    break;
+        }
+        if (*value_length > 0)
+            memcpy(*value, values[i], *value_length);
+        (*value)[*value_length] = 0;
+        ret = 1;
+    break;
+    }
+    iso_aa_get_attrs(aa_string, &num_attrs, &names,
+                     &value_lengths, &values, 1 << 15);
+    return ret;
+}
+
+
 int iso_node_get_attrs(IsoNode *node, size_t *num_attrs,
               char ***names, size_t **value_lengths, char ***values, int flag)
 {

libisofs/node.h

@@ -348,4 +348,22 @@ int iso_node_set_perms_internal(IsoNode *node, mode_t mode, int flag);
 int iso_aa_get_acl_text(unsigned char *aa_string, mode_t st_mode,
                         char **access_text, char **default_text, int flag);
 
+/**
+ * Backend of iso_node_get_attrs() with parameter node replaced by the
+ * AA string from where to get the attribute list.
+ * All other parameter specs apply.
+ */
+int iso_aa_get_attrs(unsigned char *aa_string, size_t *num_attrs,
+              char ***names, size_t **value_lengths, char ***values, int flag);
+
+/**
+ * Search given name. Eventually calloc() and copy value. Add trailing 0 byte
+ * for caller convenience.
+ *
+ * @return 1= found , 0= not found , <0 error
+ */
+int iso_aa_lookup_attr(unsigned char *aa_string, char *name,
+                       size_t *value_length, char **value, int flag);
+
+
 #endif /*LIBISO_NODE_H_*/