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Based the iso_stream_cmp_ino() comparison of streams from the loaded

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ISO filesystem on their data extents rather than on their inode numbers.
This commit is contained in:
Thomas Schmitt 2015-03-09 19:49:39 +01:00
parent e29cd723dd
commit 9e17516e0d
3 changed files with 65 additions and 30 deletions
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53
libisofs/fs_image.c
View File

@ -6298,25 +6298,46 @@ int iso_file_get_old_image_sections(IsoFile *file, int *section_count,
/* Rank two IsoFileSource by their eventual old image LBAs.
Other IsoFileSource classes will be ranked only roughly.
*/
int iso_ifs_sections_cmp(IsoFileSource *s1, IsoFileSource *s2, int flag)
int iso_ifs_sections_cmp(IsoFileSource *s1, IsoFileSource *s2, int *cmp_ret,
int flag)
{
int i;
ImageFileSourceData *d1, *d2;
if (s1->class != s2->class)
return (s1->class < s2->class ? -1 : 1);
if (s1->class != &ifs_class)
return(0);
d1= s1->data;
d2= s2->data;
for (i = 0; i < d1->nsections; i++) {
if (i >= d2->nsections)
return 1;
if (d1->sections[i].block != d2->sections[i].block)
return (d1->sections[i].block < d2->sections[i].block ? -1 : 1);
if (d1->sections[i].size != d2->sections[i].size)
return (d1->sections[i].size < d2->sections[i].size ? -1 : 1);
if (s1->class != s2->class) {
*cmp_ret = (s1->class < s2->class ? -1 : 1);
return 0;
}
return(0);
if (s1->class != &ifs_class) {
*cmp_ret = 0;
return 0;
}
d1 = s1->data;
d2 = s2->data;
if (d1->nsections < 1)
return 0;
if (d1->sections[0].size < 1)
return 0;
for (i = 0; i < d1->nsections; i++) {
if (i >= d2->nsections) {
*cmp_ret = 1;
return 1;
}
if (d1->sections[i].block != d2->sections[i].block) {
*cmp_ret = (d1->sections[i].block < d2->sections[i].block ? -1 : 1);
return 1;
}
if (d1->sections[i].size != d2->sections[i].size) {
*cmp_ret = (d1->sections[i].size < d2->sections[i].size ? -1 : 1);
return 1;
}
}
if (i < d2->nsections) {
*cmp_ret = -1;
return 1;
}
*cmp_ret = 0;
return 1;
}

10
libisofs/fsource.h
View File

@ -1,6 +1,6 @@
/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2009 - 2011 Thomas Schmitt
* Copyright (c) 2009 - 2015 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
@ -34,9 +34,13 @@ int iso_local_filesystem_new(IsoFilesystem **fs);
/* Rank two IsoFileSource of ifs_class by their eventual old image LBAs.
Other IsoFileSource classes will be ranked only roughly.
* @param cmp_ret will return the reply value -1, 0, or 1.
* @return 1= *cmp_ret is a valid reply
* 0= not both streams are of ifs_class,
* *cmp_ret is only a rough estimation.
*/
int iso_ifs_sections_cmp(IsoFileSource *s1, IsoFileSource *s2, int flag);
int iso_ifs_sections_cmp(IsoFileSource *s1, IsoFileSource *s2, int *cmp_ret,
int flag);
/* Create an independent copy of an ifs_class IsoFileSource.

32
libisofs/stream.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2009 - 2011 Thomas Schmitt
* Copyright (c) 2009 - 2015 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
@ -957,6 +957,23 @@ int iso_stream_set_image_ino(IsoStream *stream, ino_t ino, int flag)
return 0;
}
int iso_stream_cmp_ifs_sections(IsoStream *s1, IsoStream *s2, int *cmp_ret,
int flag)
{
int ret;
FSrcStreamData *fssd1, *fssd2;
if (s1->class != &fsrc_stream_class || s2->class != &fsrc_stream_class)
return 0;
/* Compare eventual image data section LBA and sizes */
fssd1= (FSrcStreamData *) s1->data;
fssd2= (FSrcStreamData *) s2->data;
ret = iso_ifs_sections_cmp(fssd1->src, fssd2->src, cmp_ret, 0);
if (ret <= 0)
return 0;
return 1;
}
/* API */
int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
{
@ -965,8 +982,6 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
dev_t dev_id1, dev_id2;
ino_t ino_id1, ino_id2;
off_t size1, size2;
FSrcStreamData *fssd1, *fssd2;
/*
#define Libisofs_stream_cmp_ino_debuG 1
@ -983,6 +998,9 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
if (s2 == NULL)
return 1;
if (iso_stream_cmp_ifs_sections(s1, s2, &ret, 0) > 0)
return ret; /* Both are unfiltered from loaded ISO filesystem */
if (s1->class->version >= 3 && !(flag & 1)) {
/* Filters may have smarter methods to compare themselves with others */
ret = s1->class->cmp_ino(s1, s2);
@ -1042,14 +1060,6 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
if (s1->class != s2->class)
return (s1->class < s2->class ? -1 : 1);
if (s1->class == &fsrc_stream_class) {
/* Compare eventual image data section LBA and sizes */
fssd1= (FSrcStreamData *) s1->data;
fssd2= (FSrcStreamData *) s2->data;
ret = iso_ifs_sections_cmp(fssd1->src, fssd2->src, 0);
if (ret != 0)
return ret;
}
if (fs_id1 == 0 && dev_id1 == 0 && ino_id1 == 0) {
return (s1 < s2 ? -1 : 1);
}