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Implemented reading of AA fields to struct image_fs_data.aa_string

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and defined IsoFileSource_Iface version 1 with access function .get_aa_string()
This commit is contained in:
Thomas Schmitt 2009-01-15 17:43:58 +01:00
parent 3c91c2f333
commit de99f93640
7 changed files with 195 additions and 19 deletions
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2
doc/susp_aaip_0_2.txt
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@ -29,7 +29,7 @@ Since the size of a SUSP field is limited to 255, multiple fields may be
needed to describe one component. The CE mechanism of SUSP shall be used to
address enough storage if needed.
This SUSP field and the ER entry of AAIP shall only be present if the ER entry
The SUSP field and the ER entry of AAIP shall only be present if the ER entry
of RRIP is present.
-------------------------------------------------------------------------------

2
libisofs/aaip_0_2.h
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@ -118,7 +118,7 @@ int aaip_get_attr_list(char *path, size_t *num_attrs, char ***names,
/* This function expects to get submitted a complete chain of AA fields and
determines its size by interpeting the SUSP structure..
determines its size by interpeting the SUSP structure.
@param aa_name The Signature Word (advised is "AA") to be looked for
@param data An arbitrary number of bytes beginning with the
complete chain of AA fields. Trailing trash is ignored.

63
libisofs/fs_image.c
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@ -265,6 +265,20 @@ struct image_fs_data
*/
off_t offset;
} data;
#ifdef Libisofs_with_aaiP
/* ts A90114 */
/**
* malloc() storage for the string of AA fields which represent
* POSIX Extended Attributes and ACLs. (Not to be confused with
* ECMA-119 Extended Attributes.)
*/
unsigned char *aa_string;
#endif /* Libisofs_with_aaiP */
};
struct child_list
@ -907,9 +921,28 @@ void ifs_free(IsoFileSource *src)
free(data->sections);
free(data->name);
#ifdef Libisofs_with_aaiP
/* ts A90115 */
if (data->aa_string != NULL)
free(data->aa_string);
#endif /* Libisofs_with_aaiP */
free(data);
}
#ifdef Libisofs_with_aaiP
/* >>> unsigned char *(*get_aa_string)(IsoFileSource *src,
unsigned char **aa_string, int flag);
*/
#endif /* Libisofs_with_aaiP */
IsoFileSourceIface ifs_class = {
0, /* version */
ifs_get_path,
@ -996,6 +1029,16 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
uint32_t relocated_dir = 0;
#ifdef Libisofs_with_aaiP
/* ts A90115 */
unsigned char *aa_string = NULL;
size_t aa_size = 0, aa_len = 0, prev_field = 0;
int aa_done = 0;
#endif /* Libisofs_with_aaiP */
if (fs == NULL || fs->data == NULL || record == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
@ -1025,7 +1068,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
if (record->len_xa[0]) {
iso_msg_submit(fsdata->msgid, ISO_UNSUPPORTED_ECMA119, 0,
"Unsupported image. This image has at least one file with "
"Extended Attributes, that are not supported");
"ECMA-119 Extended Attributes, that are not supported");
return ISO_UNSUPPORTED_ECMA119;
}
@ -1238,20 +1281,19 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
#ifdef Libisofs_with_aaiP
/* ts A90115 */
} else if (SUSP_SIG(sue, 'A', 'A')) {
ret = ISO_SUCCESS;
/* >>> ts A90112
ret = read_susp_AA(sue, &aa, &aacont);
*/
ret = read_aaip_AA(sue, "AA", &aa_string, &aa_size, &aa_len,
&prev_field, &aa_done, 0);
if (ret < 0) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, ret,
"Invalid NM entry");
"Invalid AA entry");
continue;
}
#endif /* Libisofs_with_aaiP */
@ -1512,6 +1554,13 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
ifsdata->info = atts;
ifsdata->name = name;
#ifdef Libisofs_with_aaiP
ifsdata->aa_string = aa_string;
#endif /* Libisofs_with_aaiP */
/* save extents */
ifsdata->sections = realloc(ifsdata->sections,
(1 + ifsdata->nsections) * sizeof(struct iso_file_section));

34
libisofs/libisofs.h
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@ -459,7 +459,12 @@ struct iso_filesystem
*/
struct IsoFileSource_Iface
{
/* reserved for future usage, set to 0 */
/* ts A90114 */
/**
* Tells the version of the interface:
* Version 0 provides functions up to (*lseek)().
* Version 1 additionally provides function *(get_aa_string)().
*/
int version;
/**
@ -654,13 +659,38 @@ struct IsoFileSource_Iface
* 2 The offset is set to the size of the file plus offset bytes
* (SEEK_END).
* @return
* Absolute offset posistion on the file, or < 0 on error. Cast the
* Absolute offset position of the file, or < 0 on error. Cast the
* returning value to int to get a valid libisofs error.
*
* @since 0.6.4
*/
off_t (*lseek)(IsoFileSource *src, off_t offset, int flag);
/* Add-ons of .version 1 begin here */
/* ts A90114 */
/**
* Valid only if .version is > 0. See above.
* Get the AA string with encoded ACL and/or POSIX Extended Attributes.
* (Not to be confused with ECMA-119 Extended Attributes).
* @param flag Bitfield for control purposes
* bit0= Transfer ownership of AA string data.
* src will free the eventual cached data and might
* not be able to produce it again.
* @param aa_string Returns a pointer to the AA string data. If no AA
* string is available, *aa_string becomes NULL.
* The caller is responsible for finally calling free()
* on non-NULL results.
* (See doc/susp_aaip_0_2.txt for the meaning of AA and
* libisofs/aaip_0_2.h for encoding and decoding.)
* @return 1 means success (*aa_string == NULL is possible)
* <0 means failure and must b a valid libisofs error code
* (e.g. ISO_FILE_ERROR if no better one can be found).
* @since 0.6.14
*/
unsigned char *(*get_aa_string)(IsoFileSource *src,
unsigned char **aa_string, int flag);
/*
* TODO #00004 Add a get_mime_type() function.
* This can be useful for GUI apps, to choose the icon of the file

1
libisofs/rockridge.c
View File

@ -1346,7 +1346,6 @@ int rrip_get_susp_fields(Ecma119Image *t, Ecma119Node *n, int type,
/* Obtain AA field string from node
and write it to directory entry or CE area.
*/
aapt = NULL;
ret = ISO_SUCCESS;
num_aapt = 0;

61
libisofs/rockridge.h
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@ -28,6 +28,17 @@
#include "ecma119.h"
/* ts A90112 : Enable experiments about EA and ACL
*/
#define Libisofs_with_aaiP yes
/* ts A90112
<<< write dummy AAIP fields with any node
# define Libisofs_with_aaip_dummY yes
*/
#define SUSP_SIG(entry, a, b) ((entry->sig[0] == a) && (entry->sig[1] == b))
/**
@ -115,6 +126,18 @@ struct rr_SL {
uint8_t comps[1];
};
#ifdef Libisofs_with_aaiP
/** Arbitrary Attribute (AAIP, see doc/susp_aaip_0_2.txt) */
struct rr_AA {
uint8_t flags[1];
uint8_t comps[1];
};
#endif /* Libisofs_with_aaiP */
/**
* Struct for a SUSP System User Entry (SUSP, 4.1)
*/
@ -133,6 +156,11 @@ struct susp_sys_user_entry
struct rr_NM NM;
struct rr_CL CL;
struct rr_SL SL;
#ifdef Libisofs_with_aaiP
struct rr_AA AA;
#endif /* Libisofs_with_aaiP */
} data; /* 5 to 4+len_sue */
};
@ -265,13 +293,32 @@ int read_rr_SL(struct susp_sys_user_entry *sl, char **dest, int *cont);
int read_rr_PN(struct susp_sys_user_entry *pn, struct stat *st);
/* ts A90112 : Enable experiments about EA and ACL
*/
#define Libisofs_with_aaiP yes
#ifdef Libisofs_with_aaiP
/**
* Collects the AA field string from single AA fields.
* (see doc/susp_aaip_0_2.txt)
* @param aa Signature of fields for inner representation. It will
* replace the signature of of the submitted SUSP field.
* Advised is "AA".
* @param aa_string Storage location of the emerging string.
* Begin with *aa_string == NULL, or own malloc() storage.
* @param aa_size Current allocated size of aa_string.
* Begin with *aa_size == 0, or own storage size.
* @param aa_len Current occupied size of aa_string.
* Begin with *aa_len == 0
* @param prev_field Returns the index of start of the previous field
* in the string.
* @param is_done The current completion state of the AA field string.
* Fields will be ignored as soon as it is 1.
* Begin with *is_done == 0
* @param flag Unused yet. Submit 0.
*/
int read_aaip_AA(struct susp_sys_user_entry *sue, char aa[2],
unsigned char **aa_string, size_t *aa_size, size_t *aa_len,
size_t *prev_field, int *is_done, int flag);
#endif
/* ts A90112
<<< write dummy AAIP fields with any node
# define Libisofs_with_aaip_dummY yes
*/
#endif /* LIBISO_ROCKRIDGE_H */

51
libisofs/rockridge_read.c
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@ -417,3 +417,54 @@ int read_rr_PN(struct susp_sys_user_entry *pn, struct stat *st)
| (dev_t)iso_read_bb(pn->data.PN.low, 4, NULL);
return ISO_SUCCESS;
}
#ifdef Libisofs_with_aaiP
int read_aaip_AA(struct susp_sys_user_entry *sue, char aa[2],
unsigned char **aa_string, size_t *aa_size, size_t *aa_len,
size_t *prev_field, int *is_done, int flag)
{
unsigned char *aapt;
if (*is_done) {
return ISO_WRONG_RR;
}
/* Eventually create or grow storage */
if (*aa_size == 0 || *aa_string == 0) {
*aa_size = *aa_len + sue->len_sue[0];
*aa_string = calloc(*aa_size, 1);
*aa_len = 0;
} else if (*aa_len + sue->len_sue[0] > *aa_size) {
*aa_size += *aa_len + sue->len_sue[0];
*aa_string = realloc(*aa_string, *aa_size);
}
if (*aa_string == NULL)
return ISO_OUT_OF_MEM;
if (*aa_len > 0) {
/* Mark prev_field as being continued */
(*aa_string)[*prev_field + 4] = 1;
}
*prev_field = *aa_len;
/* Compose new SUSP header with signature aa[], cont == 0 */
aapt = *aa_string + *aa_len;
aapt[0] = aa[0];
aapt[1] = aa[1];
aapt[2] = sue->len_sue[0];
aapt[3] = 1;
aapt[4] = 0;
/* Append sue payload */
memcpy(aapt + 5, sue->data.AA.comps, sue->len_sue[0]);
*is_done = sue->data.AA.flags[0] & 1;
return ISO_SUCCESS;
}
#endif /* Libisofs_with_aaiP */