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Initial implementation of MD5 checksums for session and single data files.

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To be activated by macro Libisofs_with_checksumS.
New AAIP attributes "isfs.ca" and "isofs.cx".
New API calls iso_image_get_session_md5() and iso_file_get_md5().
This commit is contained in:
Thomas Schmitt
2009-08-10 13:56:06 +02:00
parent 55690756ae
commit b5f4a66c59
15 changed files with 1349 additions and 40 deletions
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136
libisofs/node.c
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@ -13,6 +13,7 @@
#include "stream.h"
#include "aaip_0_2.h"
#include "messages.h"
#include "util.h"
#include <stdlib.h>
@ -2575,3 +2576,138 @@ int iso_node_cmp_ino(IsoNode *n1, IsoNode *n2, int flag)
{
return iso_node_cmp_flag(n1, n2, 1);
}
int iso_file_set_isofscx(IsoFile *file, unsigned int checksum_index,
int flag)
{
static char *names = "isofs.cx";
static size_t value_lengths[1] = {4};
unsigned char value[4];
char *valuept;
int i, ret;
for(i = 0; i < 4; i++)
value[3 - i] = (checksum_index >> (8 * i)) & 0xff;
valuept= (char *) value;
ret = iso_node_set_attrs((IsoNode *) file, (size_t) 1,
&names, value_lengths, &valuept, 2 | 8);
return ret;
}
int iso_root_set_isofsca(IsoNode *node, uint32_t start_lba, uint32_t end_lba,
uint32_t count, uint32_t size, char *typetext,
int flag)
{
char buffer[5 + 5 + 5 + 2 + 81], *wpt = buffer, *valuept = buffer;
int result_len, ret;
static char *names = "isofs.ca";
static size_t value_lengths[1];
/* Set value of isofs.ca with
4 byte START, 4 byte END, 4 byte COUNT, SIZE = 16, MD5 */
iso_util_encode_len_bytes(start_lba, wpt, 4, &result_len, 0);
wpt += result_len;
iso_util_encode_len_bytes(end_lba, wpt, 4, &result_len, 0);
wpt += result_len;
iso_util_encode_len_bytes(count, wpt, 4, &result_len, 0);
wpt += result_len;
iso_util_encode_len_bytes(size, wpt, 1, &result_len, 0);
wpt += result_len;
strncpy(wpt, typetext, 80);
if (strlen(typetext) > 80)
wpt += 80;
else
wpt += strlen(typetext);
value_lengths[0] = wpt - buffer;
ret = iso_node_set_attrs(node, (size_t) 1,
&names, value_lengths, &valuept, 2 | 8);
return ret;
}
int iso_root_get_isofsca(IsoNode *node, uint32_t *start_lba, uint32_t *end_lba,
uint32_t *count, uint32_t *size, char typetext[81],
int flag)
{
int ret, len;
size_t value_len;
char *value = NULL, *rpt;
ret = iso_node_lookup_attr(node, "isofs.ca", &value_len, &value, 0);
if (ret <= 0)
goto ex;
/* Parse value of isofs.ca with
4 byte START, 4 byte END, 4 byte COUNT, SIZE = 16, MD5 */
rpt = value;
iso_util_decode_len_bytes(start_lba, rpt, &len,
value_len - (rpt - value), 0);
rpt += len + 1;
iso_util_decode_len_bytes(end_lba, rpt, &len,
value_len - (rpt - value), 0);
rpt += len + 1;
iso_util_decode_len_bytes(count, rpt, &len,
value_len - (rpt - value), 0);
rpt += len + 1;
iso_util_decode_len_bytes(size, rpt, &len,
value_len - (rpt - value), 0);
rpt += len + 1;
len = value_len - (rpt - value);
if (len > 80)
len = 80;
memcpy(typetext, rpt, len);
typetext[len] = 0;
ret= ISO_SUCCESS;
ex:;
if (value != NULL)
free(value);
return ret;
}
/* API */
int iso_file_get_md5(IsoImage *image, IsoFile *file, char md5[16], int flag)
{
#ifdef Libisofs_with_checksumS
int ret, i;
size_t value_len;
char *value = NULL;
uint32_t idx = 0;
if (image->checksum_array == NULL)
return 0;
ret = iso_node_lookup_attr((IsoNode *) file, "isofs.cx",
&value_len, &value, 0);
if (ret <= 0)
goto ex;
if (value_len > 4) {
ret = 0;
goto ex;
}
for (i = 0; i < value_len; i++)
idx = (idx << 8) | ((unsigned char *) value)[i];
if (idx == 0 || idx > image->checksum_idx_count - 1) {
/* (last index is not MD5 of a file) */
ret = 0;
goto ex;
}
memcpy(md5, image->checksum_array + ((size_t) 16) * ((size_t) idx), 16);
ret = ISO_SUCCESS;
ex:;
if (value != NULL)
free(value);
return ret;
#else
return 0;
#endif /* ! Libisofs_with_checksumS */
}