utils.c (04.09.09)
exFAT file system implementation library.
- Copyright (C) 2009, 2010 Andrew Nayenko
+ Free exFAT implementation.
+ Copyright (C) 2010-2017 Andrew Nayenko
- This program is free software: you can redistribute it and/or modify
+ This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
+ the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "exfat.h"
struct stat* stbuf)
{
memset(stbuf, 0, sizeof(struct stat));
- if (node->flags & EXFAT_ATTRIB_DIR)
+ if (node->attrib & EXFAT_ATTRIB_DIR)
stbuf->st_mode = S_IFDIR | (0777 & ~ef->dmask);
else
stbuf->st_mode = S_IFREG | (0777 & ~ef->fmask);
stbuf->st_uid = ef->uid;
stbuf->st_gid = ef->gid;
stbuf->st_size = node->size;
- stbuf->st_blocks = DIV_ROUND_UP(node->size, CLUSTER_SIZE(*ef->sb)) *
- CLUSTER_SIZE(*ef->sb) / 512;
+ stbuf->st_blocks = ROUND_UP(node->size, CLUSTER_SIZE(*ef->sb)) / 512;
stbuf->st_mtime = node->mtime;
stbuf->st_atime = node->atime;
/* set ctime to mtime to ensure we don't break programs that rely on ctime
stbuf->st_ctime = node->mtime;
}
-void exfat_get_name(const struct exfat_node* node, char* buffer, size_t n)
+void exfat_get_name(const struct exfat_node* node,
+ char buffer[EXFAT_UTF8_NAME_BUFFER_MAX])
{
- if (utf16_to_utf8(buffer, node->name, n, EXFAT_NAME_MAX) != 0)
+ if (utf16_to_utf8(buffer, node->name, EXFAT_UTF8_NAME_BUFFER_MAX,
+ EXFAT_NAME_MAX) != 0)
exfat_bug("failed to convert name to UTF-8");
}
+static uint16_t add_checksum_byte(uint16_t sum, uint8_t byte)
+{
+ return ((sum << 15) | (sum >> 1)) + byte;
+}
+
+static uint16_t add_checksum_bytes(uint16_t sum, const void* buffer, size_t n)
+{
+ int i;
+
+ for (i = 0; i < n; i++)
+ sum = add_checksum_byte(sum, ((const uint8_t*) buffer)[i]);
+ return sum;
+}
+
uint16_t exfat_start_checksum(const struct exfat_entry_meta1* entry)
{
uint16_t sum = 0;
for (i = 0; i < sizeof(struct exfat_entry); i++)
if (i != 2 && i != 3) /* skip checksum field itself */
- sum = ((sum << 15) | (sum >> 1)) + ((const uint8_t*) entry)[i];
+ sum = add_checksum_byte(sum, ((const uint8_t*) entry)[i]);
return sum;
}
uint16_t exfat_add_checksum(const void* entry, uint16_t sum)
{
- int i;
-
- for (i = 0; i < sizeof(struct exfat_entry); i++)
- sum = ((sum << 15) | (sum >> 1)) + ((const uint8_t*) entry)[i];
- return sum;
+ return add_checksum_bytes(sum, entry, sizeof(struct exfat_entry));
}
-le16_t exfat_calc_checksum(const struct exfat_entry_meta1* meta1,
- const struct exfat_entry_meta2* meta2, const le16_t* name)
+le16_t exfat_calc_checksum(const struct exfat_entry* entries, int n)
{
uint16_t checksum;
- const int name_entries = DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX);
int i;
- checksum = exfat_start_checksum(meta1);
- checksum = exfat_add_checksum(meta2, checksum);
- for (i = 0; i < name_entries; i++)
- {
- struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
- memcpy(name_entry.name, name + i * EXFAT_ENAME_MAX,
- EXFAT_ENAME_MAX * sizeof(le16_t));
- checksum = exfat_add_checksum(&name_entry, checksum);
- }
+ checksum = exfat_start_checksum((const struct exfat_entry_meta1*) entries);
+ for (i = 1; i < n; i++)
+ checksum = exfat_add_checksum(entries + i, checksum);
return cpu_to_le16(checksum);
}
return sum;
}
-le16_t exfat_calc_name_hash(const struct exfat* ef, const le16_t* name)
+le16_t exfat_calc_name_hash(const struct exfat* ef, const le16_t* name,
+ size_t length)
{
size_t i;
- size_t length = utf16_length(name);
uint16_t hash = 0;
for (i = 0; i < length; i++)
uint16_t c = le16_to_cpu(name[i]);
/* convert to upper case */
- if (c < ef->upcase_chars)
- c = le16_to_cpu(ef->upcase[c]);
+ c = ef->upcase[c];
hash = ((hash << 15) | (hash >> 1)) + (c & 0xff);
hash = ((hash << 15) | (hash >> 1)) + (c >> 8);
void exfat_humanize_bytes(uint64_t value, struct exfat_human_bytes* hb)
{
size_t i;
- const char* units[] = {"bytes", "KB", "MB", "GB", "TB", "PB"};
+ /* 16 EB (minus 1 byte) is the largest size that can be represented by
+ uint64_t */
+ const char* units[] = {"bytes", "KB", "MB", "GB", "TB", "PB", "EB"};
uint64_t divisor = 1;
uint64_t temp = 0;
- for (i = 0; i < sizeof(units) / sizeof(units[0]) - 1; i++, divisor *= 1024)
+ for (i = 0; ; i++, divisor *= 1024)
{
temp = (value + divisor / 2) / divisor;
projects / sven / exfat-utils.git / blobdiff