libburnia/libisofs
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Sorted the data file content extents by ECMA-119 tree rather than

Browse Source 
by the red-black tree which shall consolidate files with identical
source object. Discovered and repaired a flaw in transitivity of
iso_stream_cmp_ino().
This commit is contained in:
stacker
2015-07-27 13:50:57 +02:00
parent 94f8503b57
commit 6947bfe5ec
17 changed files with 585 additions and 87 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
libisofs/libisofs.h
View File

@@ -985,7 +985,7 @@ struct IsoStream_Iface
* get_input_stream() added.
* A filter stream must have version 2 at least.
* Version 3 (since 0.6.20)
* compare() added.
* cmp_ino() added.
* A filter stream should have version 3 at least.
* Version 4 (since 1.0.2)
* clone_stream() added.
@@ -1107,11 +1107,15 @@ struct IsoStream_Iface
* produce the same output. If in any doubt, then this comparison should
* indicate no match. A match might allow hardlinking of IsoFile objects.
*
* If this function cannot accept one of the given stream types, then
* the decision must be delegated to
* iso_stream_cmp_ino(s1, s2, 1);
* This is also appropriate if one has reason to implement stream.cmp_ino()
* without having an own special comparison algorithm.
* A pointer value of NULL is permissible. In this case, function
* iso_stream_cmp_ino() will decide on its own.
*
* If not NULL, this function .cmp_ino() will be called by
* iso_stream_cmp_ino() if both compared streams point to it, and if not
* flag bit0 of iso_stream_cmp_ino() prevents it.
* So a .cmp_ino() function must be able to compare any pair of streams
* which name it as their .cmp_ino(). A fallback to iso_stream_cmp_ino(,,1)
* would endanger transitivity of iso_stream_cmp_ino(,,0).
*
* With filter streams, the decision whether the underlying chains of
* streams match, should be delegated to
@@ -1123,16 +1127,9 @@ struct IsoStream_Iface
* cmp_ino(A,A) == 0
* cmp_ino(A,B) == -cmp_ino(B,A)
* if cmp_ino(A,B) == 0 && cmp_ino(B,C) == 0 then cmp_ino(A,C) == 0
* Most tricky is the demand for transitivity:
* if cmp_ino(A,B) < 0 && cmp_ino(B,C) < 0 then cmp_ino(A,C) < 0
*
* A big hazard to the last constraint are tests which do not apply to some
* types of streams.Thus it is mandatory to let iso_stream_cmp_ino(s1,s2,1)
* decide in this case.
*
* A function s1.(*cmp_ino)() must only accept stream s2 if function
* s2.(*cmp_ino)() would accept s1. Best is to accept only the own stream
* type or to have the same function for a family of similar stream types.
*
* @param s1
* The first stream to compare. Expect foreign stream types.
* @param s2
@@ -6639,9 +6636,7 @@ char *iso_stream_get_source_path(IsoStream *stream, int flag);
* @return
* -1 if s1 is smaller s2 , 0 if s1 matches s2 , 1 if s1 is larger s2
* @param flag
* bit0= do not use s1->class->compare() even if available
* (e.g. because iso_stream_cmp_ino(0 is called as fallback
* from said stream->class->compare())
* bit0= do not use s1->class->cmp_ino() even if available
*
* @since 0.6.20
*/
@@ -8313,6 +8308,10 @@ int iso_conv_name_chars(IsoWriteOpts *opts, char *name, size_t name_len,
(WARNING, HIGH, -408) */
#define ISO_INTVL_READ_PROBLEM 0xD030FE68
/** Cannot arrange content of data files in surely reproducible way
(NOTE, HIGH, -409) */
#define ISO_NOT_REPRODUCIBLE 0xB030FE67
/* Internal developer note:
Place new error codes directly above this comment.
@@ -8510,5 +8509,14 @@ struct burn_source {
#define Libisofs_with_rrip_rR yes
*/
/* Experiment : bring representation of BSD installation ISOs near to
their representation by the Linux kernel.
Rock Ridge TF has ctime in CREATE rather than ATTRIBUTES.
Linux accepts this, but not for directories.
Some files only have ECMA-119 names, which Linux maps
to lowercase.
#define Libisofs_for_bsd_inst_isoS yes
*/
#endif /*LIBISO_LIBISOFS_H_*/