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IsoStream version 3 with cmp_ino(),

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new API call iso_stream_cmp_ino() for proper comparison of filtered streams
This commit is contained in:
Thomas Schmitt
2009-05-12 09:29:06 +02:00
parent 5b073a2f29
commit 8c4682ae92
6 changed files with 156 additions and 24 deletions
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27
libisofs/filters/external.c
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@ -594,8 +594,13 @@ IsoStream *extf_get_input_stream(IsoStream *stream, int flag)
}
static
int extf_cmp_ino(IsoStream *s1, IsoStream *s2);
/* Function is defined after definition of extf_stream_class */
IsoStreamIface extf_stream_class = {
2,
3,
"extf",
extf_stream_open,
extf_stream_close,
@ -605,10 +610,28 @@ IsoStreamIface extf_stream_class = {
extf_stream_get_id,
extf_stream_free,
extf_update_size,
extf_get_input_stream
extf_get_input_stream,
extf_cmp_ino
};
static
int extf_cmp_ino(IsoStream *s1, IsoStream *s2)
{
ExternalFilterStreamData *data1, *data2;
if (s1->class != &extf_stream_class || s2->class != &extf_stream_class)
return iso_stream_cmp_ino(s1, s2, 1);
data1 = (ExternalFilterStreamData*) s1->data;
data2 = (ExternalFilterStreamData*) s2->data;
if (data1->cmd != data2->cmd)
return (data1->cmd < data2->cmd ? -1 : 1);
return iso_stream_cmp_ino(data1->orig, data2->orig, 0);
}
/* ------------------------------------------------------------------------- */
static
void extf_filter_free(FilterContext *filter)
{

28
libisofs/filters/gzip.c
View File

@ -521,8 +521,12 @@ IsoStream *gzip_get_input_stream(IsoStream *stream, int flag)
}
static
int gzip_cmp_ino(IsoStream *s1, IsoStream *s2);
IsoStreamIface gzip_stream_compress_class = {
2,
3,
"gzip",
gzip_stream_open,
gzip_stream_close,
@ -532,12 +536,13 @@ IsoStreamIface gzip_stream_compress_class = {
gzip_stream_get_id,
gzip_stream_free,
gzip_update_size,
gzip_get_input_stream
gzip_get_input_stream,
gzip_cmp_ino
};
IsoStreamIface gzip_stream_uncompress_class = {
2,
3,
"pizg",
gzip_stream_open,
gzip_stream_close,
@ -547,9 +552,24 @@ IsoStreamIface gzip_stream_uncompress_class = {
gzip_stream_get_id,
gzip_stream_free,
gzip_update_size,
gzip_get_input_stream
gzip_get_input_stream,
gzip_cmp_ino
};
static
int gzip_cmp_ino(IsoStream *s1, IsoStream *s2)
{
if (s1->class != s2->class || (s1->class != &gzip_stream_compress_class &&
s2->class != &gzip_stream_compress_class))
return iso_stream_cmp_ino(s1, s2, 1);
return iso_stream_cmp_ino(iso_stream_get_input_stream(s1, 0),
iso_stream_get_input_stream(s2, 0), 0);
}
/* ------------------------------------------------------------------------- */
static
void gzip_filter_free(FilterContext *filter)

28
libisofs/filters/zisofs.c
View File

@ -775,8 +775,12 @@ IsoStream *ziso_get_input_stream(IsoStream *stream, int flag)
}
static
int ziso_cmp_ino(IsoStream *s1, IsoStream *s2);
IsoStreamIface ziso_stream_compress_class = {
2,
3,
"ziso",
ziso_stream_open,
ziso_stream_close,
@ -786,12 +790,13 @@ IsoStreamIface ziso_stream_compress_class = {
ziso_stream_get_id,
ziso_stream_free,
ziso_update_size,
ziso_get_input_stream
ziso_get_input_stream,
ziso_cmp_ino
};
IsoStreamIface ziso_stream_uncompress_class = {
2,
3,
"osiz",
ziso_stream_open,
ziso_stream_close,
@ -801,10 +806,25 @@ IsoStreamIface ziso_stream_uncompress_class = {
ziso_stream_get_id,
ziso_stream_free,
ziso_update_size,
ziso_get_input_stream
ziso_get_input_stream,
ziso_cmp_ino
};
static
int ziso_cmp_ino(IsoStream *s1, IsoStream *s2)
{
if (s1->class != s2->class || (s1->class != &ziso_stream_compress_class &&
s2->class != &ziso_stream_uncompress_class))
iso_stream_cmp_ino(s1, s2, 1);
return iso_stream_cmp_ino(iso_stream_get_input_stream(s1, 0),
iso_stream_get_input_stream(s2, 0), 0);
}
/* ------------------------------------------------------------------------- */
static
void ziso_filter_free(FilterContext *filter)
{

77
libisofs/libisofs.h
View File

@ -759,8 +759,11 @@ typedef struct IsoStream_Iface IsoStreamIface;
extern ino_t serial_id;
/**
* Interface definition for IsoStream methods.
*
* Interface definition for IsoStream methods. It is public to allow
* implementation of own stream types.
* The methods defined here typically make use of stream.data which points
* to the individual state data of stream instances.
*
* @since 0.6.4
*/
struct IsoStream_Iface
@ -773,6 +776,8 @@ struct IsoStream_Iface
* update_size() added.
* Version 2 (since 0.6.18)
* get_input_stream() added. A filter stream must have version 2.
* Version 3 (since 0.6.20)
* compare() added. A filter stream should have version 3.
*/
int version;
@ -856,7 +861,6 @@ struct IsoStream_Iface
void (*free)(IsoStream *stream);
/**
* Present if .version is 1 or higher:
* Updates the size of the IsoStream with the current size of the
* underlying source. After calling this, get_size() will return
* the new size. This should never be called after
@ -869,24 +873,61 @@ struct IsoStream_Iface
* 1 if ok, < 0 on error (has to be a valid libisofs error code)
*
* @since 0.6.8
* Present if .version is 1 or higher.
*/
int (*update_size)(IsoStream *stream);
/**
* Present if .version is 2 or higher:
* Obtains the eventual input stream of a filter stream.
*
* @param stream
* The eventual filter stream to be inquired.
* The eventual filter stream to be inquired.
* @param flag
* Bitfield for control purposes. Submit 0 for now.
* Bitfield for control purposes. Submit 0 for now.
* @return
* The input stream, if one exists. Elsewise NULL.
* No extra reference to the stream is taken by this call.
* The input stream, if one exists. Elsewise NULL.
* No extra reference to the stream is taken by this call.
*
* @since 0.6.18
* Present if .version is 2 or higher.
*/
IsoStream *(*get_input_stream)(IsoStream *stream, int flag);
/* ts A90511 */
/**
* Compare two streams whether they are based on the same input and will
* produce the same output. If in any doubt, then this comparison should
* indicate no match. A match might allow hardlinking of IsoFile objects.
* This function has to establish an equivalence and order relation:
* A = A, if A = B then B = A, if A = B and B = C then A = C,
* if A < B then not B < A, if A < B and B < C then A < C
*
* 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.
*
* If the 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 special comparison algorithm.
* With filter streams the decision whether the underlying chains of
* streams match should be delegated to
* iso_stream_cmp_ino(iso_stream_get_input_stream(s1, 0),
* iso_stream_get_input_stream(s2, 0), 0);
*
* @param s1
* The first stream to compare. Expect foreign stream types.
* @param s2
* The second stream to compare. Expect foreign stream types.
* @return
* -1 if s1 is smaller s2 , 0 if s1 matches s2 , 1 if s1 is larger s2
*
* @since 0.6.20
* Present if .version is 3 or higher.
*/
int (*cmp_ino)(IsoStream *s1, IsoStream *s2);
};
/**
@ -4162,6 +4203,26 @@ void iso_stream_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
*/
char *iso_stream_get_source_path(IsoStream *stream, int flag);
/* ts A90502 */
/**
* Compare two streams whether they are based on the same input and will
* produce the same output. If in any doubt, then this comparison will
* indicate no match.
*
* @param s1
* The first stream to compare.
* @param s2
* The second stream to compare.
* @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())
*
* @since 0.6.20
*/
int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag);
/* --------------------------------- AAIP --------------------------------- */

17
libisofs/stream.c
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@ -728,10 +728,11 @@ int iso_stream_set_image_ino(IsoStream *stream, ino_t ino, int flag)
return 0;
}
/* ts A90502 */
/* The former core of iso_file_src_cmp() */
/* ts A90511 */
/* API */
int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
{
int ret;
unsigned int fs_id1, fs_id2;
dev_t dev_id1, dev_id2;
ino_t ino_id1, ino_id2;
@ -741,9 +742,19 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
static int report_counter = 0;
static int debug = 1;
if (s1 == s2) {
if (s1 == s2)
return 0;
if (s1 == NULL)
return -1;
if (s2 == NULL)
return 1;
if (s1->class->version >= 3 && !(flag & 1)) {
/* Filters may have smarter methods to compare themselves with others */
ret = s1->class->cmp_ino(s1, s2);
return ret;
}
iso_stream_get_id(s1, &fs_id1, &dev_id1, &ino_id1);
iso_stream_get_id(s2, &fs_id2, &dev_id2, &ino_id2);
if (fs_id1 < fs_id2) {

3
libisofs/stream.h
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@ -82,8 +82,5 @@ int iso_stream_get_src_zf(IsoStream *stream, int *header_size_div4,
*/
int iso_stream_set_image_ino(IsoStream *stream, ino_t ino, int flag);
/* ts A90502 */
/* The former core of iso_file_src_cmp() */
int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag);
#endif /*STREAM_H_*/