New API calls iso_write_opts_set_record_md5(), iso_read_opts_set_no_md5()

libisofs/ecma119.c

@@ -1038,9 +1038,8 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
 
 #ifdef Libisofs_with_checksumS
 
-    /* >>> need an IsoWriteOpts component to control this */;
+    target->md5_file_checksums = opts->md5_file_checksums;
-    target->md5_checksums = 1;
+    target->md5_session_checksum = opts->md5_session_checksum;
-
     target->checksum_idx_counter = 0;
     target->checksum_ctx = NULL;
     target->checksum_counter = 0;
@@ -1074,7 +1073,7 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
 
 #ifdef Libisofs_with_checksumS
 
-    if (target->md5_checksums) {
+    if (target->md5_file_checksums || target->md5_session_checksum) {
         nwriters++;
         ret = checksum_prepare_image(src, 0);
         if (ret < 0)
@@ -1154,7 +1153,7 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
 
     /* ??? Is it safe to add a writer after the content writer ? */
 
-    if (target->md5_checksums) {
+    if (target->md5_file_checksums || target->md5_session_checksum) {
         ret = checksum_writer_create(target);
         if (ret < 0)
             goto target_cleanup;
@@ -1274,10 +1273,12 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
     /* 4. Create and start writing thread */
 
 #ifdef Libisofs_with_checksumS
+    if (target->md5_session_checksum) {
         /* After any fake writes are done: Initialize image checksum context */
         ret = libisofs_md5(&(target->checksum_ctx), NULL, 0, NULL, 1);
         if (ret < 0)
             return ret;
+    }
 #endif /* Libisofs_with_checksumS */
 
     /* ensure the thread is created joinable */
@@ -1717,6 +1718,19 @@ int iso_write_opts_set_sort_files(IsoWriteOpts *opts, int sort)
     return ISO_SUCCESS;
 }
 
+int iso_write_opts_set_record_md5(IsoWriteOpts *opts, int session, int files)
+{
+
+#ifdef Libisofs_with_checksumS
+
+    opts->md5_session_checksum = !!session;
+    opts->md5_file_checksums = !!files;
+
+#endif /* Libisofs_with_checksumS */
+
+    return ISO_SUCCESS;
+}
+
 int iso_write_opts_set_replace_mode(IsoWriteOpts *opts, int dir_mode,
                                     int file_mode, int uid, int gid)
 {

libisofs/ecma119.h

@@ -147,6 +147,27 @@ struct iso_write_opts {
      */
     unsigned int dir_rec_mtime :1;
 
+#ifdef Libisofs_with_checksumS
+
+    /**
+     * Compute MD5 checksum for the whole session and record it as index 0 of
+     * the checksum blocks after the data area of the session. The layout and
+     * position of these blocks will be recorded in xattr "isofs.ca" of the
+     * root node. See see also API call iso_image_get_session_md5().
+     */
+    unsigned int md5_session_checksum :1;
+
+    /**
+     * Compute MD5 checksums for IsoFile objects and write them to blocks
+     * after the data area of the session. The layout and position of these
+     * blocks will be recorded in xattr "isofs.ca" of the root node.
+     * The indice of the MD5 sums will be recorded with the IsoFile directory
+     * entries as xattr "isofs.cx". See also API call iso_file_get_md5().
+     */
+    unsigned int md5_file_checksums :1;
+
+#endif /* Libisofs_with_checksumS */
+
     /** If files should be sorted based on their weight. */
     unsigned int sort_files :1;
 
@@ -314,7 +335,8 @@ struct ecma119_image
 
 #ifdef Libisofs_with_checksumS
 
-    unsigned int md5_checksums :1;
+    unsigned int md5_session_checksum :1;
+    unsigned int md5_file_checksums :1;
 
 #endif /* Libisofs_with_checksumS */
 

libisofs/filesrc.c

@@ -117,7 +117,7 @@ int iso_file_src_create(Ecma119Image *img, IsoFile *file, IsoFileSrc **src)
 
 #ifdef Libisofs_with_checksumS
 
-    if(img->md5_checksums) {
+    if(img->md5_file_checksums) {
         img->checksum_idx_counter++;
         if (img->checksum_idx_counter < 0x80000000) {
             fsrc->checksum_index= img->checksum_idx_counter;

libisofs/fs_image.c

@@ -62,6 +62,7 @@ struct iso_read_opts
     unsigned int nojoliet : 1; /*< Do not read Joliet extensions */
     unsigned int noiso1999 : 1; /*< Do not read ISO 9660:1999 enhanced tree */
     unsigned int noaaip : 1; /* Do not read AAIP extension for xattr and ACL */
+    unsigned int nomd5 : 1;  /* Do not read MD5 array */
 
     /**
      * Hand out new inode numbers and overwrite eventually read PX inode
@@ -249,6 +250,11 @@ typedef struct
      */
     int aaip_load;
 
+    /** Whether the MD5 array shall be read if available.
+     *  1 = yes , 0 = no
+     */
+    int md5_load;
+
     /** Whether AAIP is present. Version major.minor = major * 100 + minor
      *  Value -1 means that no AAIP ER was detected yet.
      */
@@ -2311,6 +2317,7 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
     data->dir_mode = opts->dir_mode & ~S_IFMT;
     data->msgid = msgid;
     data->aaip_load = !opts->noaaip;
+    data->md5_load = !opts->nomd5;
     data->aaip_version = -1;
     data->make_new_ino = opts->make_new_ino;
     data->inode_counter = 0;
@@ -3149,10 +3156,8 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
 
 #ifdef Libisofs_with_checksumS
 
-    /* Read checksum buffer */
+    if (data->md5_load) {
-
+        /* Read checksum array */
-    /* >>> needs to be controlled by  iso_read_opts  */;
-
         ret = iso_root_get_isofsca((IsoNode *) image->root,
                                    &(image->checksum_start_lba),
                                    &(image->checksum_end_lba),
@@ -3177,6 +3182,7 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
                     goto import_revert;
             }
         }
+    }
 
 #endif /* Libisofs_with_checksumS */
 
@@ -3291,6 +3297,7 @@ int iso_read_opts_new(IsoReadOpts **opts, int profile)
     ropts->file_mode = 0444;
     ropts->dir_mode = 0555;
     ropts->noaaip= 1;
+    ropts->nomd5= 1;
 
     *opts = ropts;
     return ISO_SUCCESS;
@@ -3351,6 +3358,15 @@ int iso_read_opts_set_no_aaip(IsoReadOpts *opts, int noaaip)
     return ISO_SUCCESS;
 }
 
+int iso_read_opts_set_no_md5(IsoReadOpts *opts, int no_md5)
+{
+    if (opts == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    opts->nomd5 = no_md5 ? 1 : 0;
+    return ISO_SUCCESS;
+}
+
 
 int iso_read_opts_set_new_inos(IsoReadOpts *opts, int new_inos)
 {

libisofs/libisofs.h

@@ -1415,6 +1415,22 @@ int iso_write_opts_set_dir_rec_mtime(IsoWriteOpts *opts, int allow);
  */
 int iso_write_opts_set_sort_files(IsoWriteOpts *opts, int sort);
 
+/**
+ * Whether to compute and record MD5 checksums for the whole session and/or
+ * for each single IsoFile object. The checksums represent the data as they
+ * were written into the image output stream, not necessarily as they were
+ * on hard disk at any point of time.
+ * See also calls iso_image_get_session_md5() and iso_file_get_md5().
+ * @param opts
+ *      The option set to be manipulated.
+ * @param session
+ *      If not 0: compute session checksum
+ * @param files
+ *      If not 0: compute a checksum for each single IsoFile object.
+ * @since 0.6.22
+ */
+int iso_write_opts_set_record_md5(IsoWriteOpts *opts, int session, int files);
+
 /**
  * Whether to set default values for files and directory permissions, gid and
  * uid. All these take one of three values: 0, 1 or 2.
@@ -1755,6 +1771,22 @@ int iso_read_opts_set_no_iso1999(IsoReadOpts *opts, int noiso1999);
  */
 int iso_read_opts_set_no_aaip(IsoReadOpts *opts, int noaaip);
 
+/**
+ * Control reading of an array of MD5 checksums which is eventually stored
+ * at the end of a session. See also iso_write_opts_set_record_md5().
+ * Important: Loading of the MD5 array will only work if AAIP is enabled
+ *            because its position and layout is recorded in xattr "isofs.ca".
+ *
+ * @param no_md5
+ *    1 = Do not read MD5 checksum array
+ *    0 = Read Md% array if available
+ *     All other values are reserved.
+ *
+ * @since 0.6.22
+ */
+int iso_read_opts_set_no_md5(IsoReadOpts *opts, int no_md5);
+
+
 /**
  * Control discarding of eventual inode numbers from existing images.
  * Such numbers may come from RRIP 1.12 entries PX. If not discarded they
@@ -4963,7 +4995,7 @@ int iso_gzip_get_refcounts(off_t *gzip_count, off_t *gunzip_count, int flag);
 /**
  * Eventually obtain the recorded MD5 checksum of the session which was
  * loaded as ISO image. Such a checksum may be stored together with others
- * in a contiguous array at the end of the ISO image. The session checksum
+ * in a contiguous array at the end of the session. The session checksum
  * covers the data blocks from address start_lba to address end_lba - 1.
  * It does not cover the recorded array of md5 checksums.
  * Layout, size, and position of the checksum array is recorded in the xattr
@@ -4972,7 +5004,7 @@ int iso_gzip_get_refcounts(off_t *gzip_count, off_t *gunzip_count, int flag);
  *      The image to inquire
  * @param start_lba
  *      Eventually returns the first block address covered by md5
- * @param start_lba
+ * @param end_lba
  *      Eventually returns the first block address not covered by md5 any more
  * @param md5
  *      Eventually returns 16 byte of MD5 checksum 
@@ -4989,8 +5021,8 @@ int iso_image_get_session_md5(IsoImage *image, uint32_t *start_lba,
 /**
  * Eventually obtain the recorded MD5 checksum of a data file from the loaded
  * ISO image. Such a checksum may be stored with others in a contiguous
- * array at the end of the ISO image. The data file eventually has an xattr
+ * array at the end of the loaded session. The data file eventually has an
- * "isofs.cx" which gives the index in that array.
+ * xattr "isofs.cx" which gives the index in that array.
  * @param image
  *      The image from which file stems.
  * @param file
@@ -5516,8 +5548,8 @@ struct burn_source {
                image.
 
                ENABLE ONLY FOR DEVELOPMENT TESTS !
- #define Libisofs_with_checksumS yes
 */
+#define Libisofs_with_checksumS yes
 
 
 #endif /*LIBISO_LIBISOFS_H_*/

libisofs/md5.c

@@ -457,11 +457,15 @@ int checksum_writer_write_data(IsoImageWriter *writer)
     iso_msg_debug(t->image->id, "Writing Checksums...");
 
     /* Write image checksum to index 0 */
+    if (t->checksum_ctx != NULL) {
+
         /* >>> rather fork a result than killing t->checksum_ctx */;
+
         res = libisofs_md5(&(t->checksum_ctx), NULL, 0, t->image_md5,
                            2 | (1 << 15));
         if (res > 0)
             memcpy(t->checksum_buffer + 0, t->image_md5, 16);
+    }
 
     size = (t->checksum_idx_counter + 2) / 128 + 1;