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Making sure that ZF fields get appropriately carried on with multi-session

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even if osiz filters have been removed.
This commit is contained in:
Thomas Schmitt 2009-04-12 13:13:04 +02:00
parent 99ddd5c116
commit ec672ab903
4 changed files with 113 additions and 18 deletions
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27
libisofs/fs_image.c
View File

@ -1008,6 +1008,33 @@ IsoFileSourceIface ifs_class = {
};
/* Used from libisofs/stream.c : iso_stream_get_src_zf() */
int iso_ifs_source_get_zf(IsoFileSource *src, int *header_size_div4,
int *block_size_log2, uint32_t *uncompressed_size,
int flag)
{
#ifdef Libisofs_with_zliB
ImageFileSourceData *data;
if (src->class != &ifs_class)
return 0;
data = src->data;
*header_size_div4 = data->header_size_div4;
*block_size_log2 = data->block_size_log2;
*uncompressed_size = data->uncompressed_size;
return 1;
#else
return 0;
#endif /* ! Libisofs_with_zliB */
}
/**
* Read a file name from a directory record, doing the needed charset
* conversion

68
libisofs/rockridge.c
View File

@ -806,7 +806,8 @@ int add_zf_field(Ecma119Image *t, Ecma119Node *n, struct susp_info *info,
int ret, will_copy = 1, stream_type = 0, do_zf = 0;
int header_size_div4 = 0, block_size_log2 = 0;
uint32_t uncompressed_size = 0;
IsoStream *stream = NULL, *input_stream, *next_stream;
IsoStream *stream = NULL, *input_stream, *last_stream, *first_stream;
IsoStream *first_filter = NULL;
IsoFile *file;
/* Intimate friendship with this function in filters/zisofs.c */
@ -819,18 +820,34 @@ int add_zf_field(Ecma119Image *t, Ecma119Node *n, struct susp_info *info,
return 2;
file = (IsoFile *) n->node;
/* Inspect: last_stream < ... < first_filter < first_stream */
/* The content is in zisofs format if:
It gets copied and
the last stream is a ziso stream,
or it had a ZF entry and is unfiltered
>>> or its last stream delivers a zisofs file header
or it stays uncopied and
the first filter is an osiz stream,
or it had a ZF entry
>>> or its first stream delivers a zisofs file header
*/
if (t->appendable && file->from_old_session)
will_copy = 0;
next_stream = stream = iso_file_get_stream(file);
while (!will_copy) { /* Obtain second-most original stream
(the eventual osiz filter on the image stream) */
input_stream = iso_stream_get_input_stream(next_stream, 0);
first_filter = first_stream = last_stream = iso_file_get_stream(file);
while (1) {
input_stream = iso_stream_get_input_stream(first_stream, 0);
if (input_stream == NULL)
break;
stream = next_stream;
next_stream = input_stream;
first_filter = first_stream;
first_stream = input_stream;
}
if (will_copy) {
stream = last_stream;
} else {
/* (the eventual osiz filter on the image stream) */
stream = first_filter;
}
/* Determine stream type : 1=ziso , -1=osiz , 0=other */
@ -840,18 +857,33 @@ int add_zf_field(Ecma119Image *t, Ecma119Node *n, struct susp_info *info,
return ret;
if (stream_type == 1 && will_copy) {
do_zf = 1;
do_zf = 1;
} else if (stream_type == -1 && !will_copy) {
do_zf = 1;
/* >>> } else if (t->zisofs_magic) { */
/* >>> open stream via temporary osiz filter and read 0 bytes.
If no error: do_zf = 1; */;
/* >>> obtain
header_size_div4, block_size_log2, uncompressed_size */;
do_zf = 1;
} else if(first_stream == last_stream || !will_copy) {
/* Try whether the image side stream remembers a ZF field */
ret = iso_stream_get_src_zf(first_stream, &header_size_div4,
&block_size_log2, &uncompressed_size, 0);
if (ret == 1 && header_size_div4 > 0)
do_zf = 1;
}
#ifdef Libisofs_not_yeT
if (t->zisofs_magic && (flag & 1) && !do_zf) {
if (will_copy) {
stream = last_stream;
} else {
stream = first_stream;
}
/* >>> open stream via temporary osiz filter and read 0 bytes.
If no error: do_zf = 1; */;
/* >>> obtain
header_size_div4, block_size_log2, uncompressed_size */;
/* >>> record info for runs with !(flag&1) : as n->node->xinfo */;
}
#endif
if (!do_zf)
return 2;

24
libisofs/stream.c
View File

@ -225,6 +225,30 @@ int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
return ISO_SUCCESS;
}
int iso_stream_get_src_zf(IsoStream *stream, int *header_size_div4,
int *block_size_log2, uint32_t *uncompressed_size,
int flag)
{
int ret;
FSrcStreamData *data;
IsoFileSource *src;
/* Intimate friendship with libisofs/fs_image.c */
int iso_ifs_source_get_zf(IsoFileSource *src, int *header_size_div4,
int *block_size_log2, uint32_t *uncompressed_size, int flag);
if (stream->class != &fsrc_stream_class)
return 0;
data = stream->data;
src = data->src;
ret = iso_ifs_source_get_zf(src, header_size_div4, block_size_log2,
uncompressed_size, 0);
return ret;
}
struct cut_out_stream
{
IsoFileSource *src;

12
libisofs/stream.h
View File

@ -62,4 +62,16 @@ int iso_cut_out_stream_new(IsoFileSource *src, off_t offset, off_t size,
*/
int iso_memory_stream_new(unsigned char *buf, size_t size, IsoStream **stream);
/**
* Obtain eventual zisofs ZF field entry parameters from a file source out
* of a loaded ISO image.
* To make hope for non-zero reply the stream has to be the original stream
* of an IsoFile with .from_old_session==1. The call is safe with any stream
* type, though, unless fsrc_stream_class would be used without FSrcStreamData.
* @return 1= returned parameters are valid, 0=no ZF info found , <0 error
*/
int iso_stream_get_src_zf(IsoStream *stream, int *header_size_div4,
int *block_size_log2, uint32_t *uncompressed_size,
int flag);
#endif /*STREAM_H_*/