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Support for reading ISO-9660:1999 images.

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This commit is contained in:
Vreixo Formoso 2008-01-17 00:15:42 +01:00
parent c57a5196a3
commit 57025a614d
6 changed files with 135 additions and 22 deletions
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1
demo/iso_ms.c
View File

@ -59,6 +59,7 @@ int main(int argc, char **argv)
0, /* block */
0, /* norock */
0, /* nojoliet */
0, /* noiso1999 */
0, /* preferjoliet */
0, /* uid; */
0, /* gid; */

1
demo/iso_read.c
View File

@ -116,6 +116,7 @@ int main(int argc, char **argv)
0, /* block */
0, /* norock */
0, /* nojoliet */
0, /* noiso1999 */
0, /* preferjoliet */
0, /* uid; */
0, /* gid; */

103
src/fs_image.c
View File

@ -91,19 +91,18 @@ typedef struct
*/
uint32_t svd_root_block;
/**
* Will be filled with the block lba of the extend for the root directory,
* as read from the enhanced volume descriptor (ISO 9660:1999)
*/
uint32_t evd_root_block;
/**
* If we need to read RR extensions. i.e., if the image contains RR
* extensions, and the user wants to read them.
*/
enum read_rr_ext rr;
/**
* The function used to read the name from a directoy record. For ISO,
* the name is in US-ASCII. For Joliet, in UCS-2BE. Thus, we need
* different functions for both.
*/
char *(*get_name)(const char *, size_t);
/**
* Bytes skipped within the System Use field of a directory record, before
* the beginning of the SUSP system user entries. See IEEE 1281, SUSP. 5.3.
@ -131,6 +130,9 @@ typedef struct
/** If Joliet extensions are available on image */
unsigned int joliet : 1;
/** If ISO 9660:1999 is available on image */
unsigned int iso1999 : 1;
/**
* Number of blocks of the volume, as reported in the PVM.
@ -695,6 +697,40 @@ IsoFileSourceIface ifs_class = {
ifs_free
};
/**
* Read a file name from a directory record, doing the needed charset
* conversion
*/
static
char *get_name(_ImageFsData *fsdata, const char *str, size_t len)
{
int ret;
char *name = NULL;
if (strcmp(fsdata->local_charset, fsdata->input_charset)) {
/* charset conversion needed */
ret = strnconv(str, fsdata->input_charset, fsdata->local_charset, len,
&name);
if (ret == 1) {
return name;
} else {
iso_msg_sorry(fsdata->messenger, LIBISO_CHARSET_ERROR,
"Charset conversion error. Can't convert %s from %s to %s",
str, fsdata->input_charset, fsdata->local_charset);
/* fallback */
}
}
/* we reach here when the charset conversion is not needed or has failed */
name = malloc(len + 1);
if (name == NULL) {
return NULL;
}
memcpy(name, str, len);
name[len] = '\0';
return name;
}
/**
*
* @return
@ -991,7 +1027,8 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
return ISO_WRONG_ECMA119;
}
} else {
name = fsdata->get_name((char*)record->file_id, record->len_fi[0]);
name = get_name(fsdata, (char*)record->file_id, record->len_fi[0]);
if (name == NULL) {
iso_msg_sorry(fsdata->messenger, LIBISO_WRONG_IMG,
"Can't retrieve file name");
@ -1625,15 +1662,6 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
ret = ISO_MEM_ERROR;
goto fs_cleanup;
}
if (opts->input_charset != NULL) {
data->input_charset = strdup(opts->input_charset);
} else {
data->input_charset = strdup(data->local_charset);
}
if (data->input_charset == NULL) {
ret = ISO_MEM_ERROR;
goto fs_cleanup;
}
ifs->open = ifs_fs_open;
ifs->close = ifs_fs_close;
@ -1701,15 +1729,30 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
sup->esc_sequences[2] == 0x45) ) {
/* it's a Joliet Sup. Vol. Desc. */
iso_msg_debug(data->messenger, "Found Joliet extensions");
data->joliet = 1;
root = (struct ecma119_dir_record*)sup->root_dir_record;
data->svd_root_block = iso_read_bb(root->block, 4, NULL);
//TODO maybe we can set the IsoImage attribs from this
//descriptor
//TODO a joliet tree can also have RR extensions. What
//about this?
} else if (sup->vol_desc_version[0] == 2) {
/*
* It is an Enhanced Volume Descriptor, image is an
* ISO 9660:1999
*/
iso_msg_debug(data->messenger, "Found ISO 9660:1999");
data->iso1999 = 1;
root = (struct ecma119_dir_record*)sup->root_dir_record;
data->evd_root_block = iso_read_bb(root->block, 4, NULL);
//TODO an ISO 9660:1999 tree can also have RR extensions.
// What about this?
} else {
iso_msg_hint(data->messenger, LIBISO_UNSUPPORTED_VD,
"Unsupported (not Joliet) Sup. Vol. Desc found.");
"Unsupported Sup. Vol. Desc found.");
}
}
break;
@ -1746,30 +1789,45 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
if (!opts->nojoliet && opts->preferjoliet && data->joliet) {
/* if user prefers joliet, that is used */
iso_msg_debug(data->messenger, "Reading Joliet extensions.");
data->get_name = ucs2str;
data->input_charset = strdup("UCS-2BE");
data->rr = RR_EXT_NO;
data->iso_root_block = data->svd_root_block;
} else {
/* RR will be used */
iso_msg_debug(data->messenger, "Reading Rock Ridge extensions.");
data->iso_root_block = data->pvd_root_block;
data->get_name = strcopy;
}
} else {
/* RR extensions are not available */
if (!opts->nojoliet && data->joliet) {
/* joliet will be used */
iso_msg_debug(data->messenger, "Reading Joliet extensions.");
data->get_name = ucs2str;
data->input_charset = strdup("UCS-2BE");
data->iso_root_block = data->svd_root_block;
} else if (!opts->noiso1999 && data->iso1999) {
/* we will read ISO 9660:1999 */
iso_msg_debug(data->messenger, "Reading ISO-9660:1999 tree.");
data->iso_root_block = data->evd_root_block;
} else {
/* default to plain iso */
iso_msg_debug(data->messenger, "Reading plain ISO-9660 tree.");
data->iso_root_block = data->pvd_root_block;
data->get_name = strcopy;
data->input_charset = strdup("ASCII");
}
}
if (data->input_charset == NULL) {
if (opts->input_charset != NULL) {
data->input_charset = strdup(opts->input_charset);
} else {
data->input_charset = strdup(data->local_charset);
}
}
if (data->input_charset == NULL) {
ret = ISO_MEM_ERROR;
goto fs_cleanup;
}
/* and finally return. Note that we keep the DataSource opened */
*fs = ifs;
@ -2203,6 +2261,7 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
if (features != NULL) {
features->hasJoliet = data->joliet;
features->hasRR = data->rr_version != 0;
features->hasIso1999 = data->iso1999;
features->hasElTorito = data->eltorito;
features->size = data->nblocks;
}

7
src/libisofs.h
View File

@ -350,6 +350,7 @@ struct iso_read_opts
unsigned int norock : 1; /*< Do not read Rock Ridge extensions */
unsigned int nojoliet : 1; /*< Do not read Joliet extensions */
unsigned int noiso1999 : 1; /*< Do not read ISO 9660:1999 enhanced tree */
/**
* When both Joliet and RR extensions are present, the RR tree is used.
@ -382,6 +383,12 @@ struct iso_read_image_features
/** It will be set to 1 if Joliet extensions are present, to 0 if not. */
unsigned int hasJoliet :1;
/**
* It will be set to 1 if the image is an ISO 9660:1999, i.e. it ha
* a version 2 Enhanced Volume Descriptor.
*/
unsigned int hasIso1999 :1;
/** It will be set to 1 if El-Torito boot record is present, to 0 if not.*/
unsigned int hasElTorito :1;

42
src/util.c
View File

@ -86,6 +86,48 @@ int strconv(const char *str, const char *icharset, const char *ocharset,
return ISO_SUCCESS;
}
int strnconv(const char *str, const char *icharset, const char *ocharset,
size_t len, char **output)
{
size_t inbytes;
size_t outbytes;
size_t n;
iconv_t conv;
char *out;
char *src;
char *ret;
inbytes = len;
outbytes = (inbytes + 1) * MB_LEN_MAX;
out = alloca(outbytes);
if (out == NULL) {
return ISO_MEM_ERROR;
}
conv = iconv_open(ocharset, icharset);
if (conv == (iconv_t)(-1)) {
return ISO_CHARSET_CONV_ERROR;
}
src = (char *)str;
ret = (char *)out;
n = iconv(conv, &src, &inbytes, &ret, &outbytes);
if (n == -1) {
/* error */
iconv_close(conv);
return ISO_CHARSET_CONV_ERROR;
}
*ret = '\0';
iconv_close(conv);
*output = malloc(ret - out + 1);
if (*output == NULL) {
return ISO_MEM_ERROR;
}
memcpy(*output, out, ret - out + 1);
return ISO_SUCCESS;
}
/**
* Convert a str in a specified codeset to WCHAR_T.
* The result must be free() when no more needed

3
src/util.h
View File

@ -42,6 +42,9 @@ int int_pow(int base, int power);
int strconv(const char *input, const char *icharset, const char *ocharset,
char **output);
int strnconv(const char *str, const char *icharset, const char *ocharset,
size_t len, char **output);
/**
* Convert a given string from any input charset to ASCII
*