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authorbigbiff bigbiff <bigbiff@teamw.in>2013-03-07 15:59:37 +0100
committerbigbiff bigbiff <bigbiff@teamw.in>2013-03-08 00:08:12 +0100
commit998716f0cbc07a7486925810442dc81c8d13c31c (patch)
treee0321ff6383b990d92b95089f31e916ac29fe37d /exfat/libexfat/cluster.c
parentuse md5.c for computation of md5sums (diff)
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Diffstat (limited to '')
-rw-r--r--exfat/libexfat/cluster.c65
1 files changed, 26 insertions, 39 deletions
diff --git a/exfat/libexfat/cluster.c b/exfat/libexfat/cluster.c
index 83c983da4..d10a5dfe7 100644
--- a/exfat/libexfat/cluster.c
+++ b/exfat/libexfat/cluster.c
@@ -106,41 +106,24 @@ cluster_t exfat_advance_cluster(const struct exfat* ef,
return node->fptr_cluster;
}
-static cluster_t find_bit_and_set(uint8_t* bitmap, cluster_t start,
- cluster_t end)
+static cluster_t find_bit_and_set(uint8_t* bitmap, size_t start, size_t end)
{
- const cluster_t mid_start = (start + 7) / 8 * 8;
- const cluster_t mid_end = end / 8 * 8;
- cluster_t c;
- cluster_t byte;
-
- for (c = start; c < mid_start; c++)
- if (BMAP_GET(bitmap, c) == 0)
- {
- BMAP_SET(bitmap, c);
- return c + EXFAT_FIRST_DATA_CLUSTER;
- }
-
- for (byte = mid_start / 8; byte < mid_end / 8; byte++)
- if (bitmap[byte] != 0xff)
- {
- cluster_t bit;
-
- for (bit = 0; bit < 8; bit++)
- if (!(bitmap[byte] & (1u << bit)))
- {
- bitmap[byte] |= (1u << bit);
- return byte * 8 + bit + EXFAT_FIRST_DATA_CLUSTER;
- }
- }
-
- for (c = mid_end; c < end; c++)
- if (BMAP_GET(bitmap, c) == 0)
- {
- BMAP_SET(bitmap, c);
- return c + EXFAT_FIRST_DATA_CLUSTER;
- }
+ const size_t start_index = start / 8;
+ const size_t end_index = DIV_ROUND_UP(end, 8);
+ size_t i;
+ size_t c;
+ for (i = start_index; i < end_index; i++)
+ {
+ if (bitmap[i] == 0xff)
+ continue;
+ for (c = MAX(i * 8, start); c < MIN((i + 1) * 8, end); c++)
+ if (BMAP_GET(bitmap, c) == 0)
+ {
+ BMAP_SET(bitmap, c);
+ return c + EXFAT_FIRST_DATA_CLUSTER;
+ }
+ }
return EXFAT_CLUSTER_END;
}
@@ -151,7 +134,7 @@ void exfat_flush_cmap(struct exfat* ef)
ef->cmap.dirty = false;
}
-static void set_next_cluster(const struct exfat* ef, int contiguous,
+static void set_next_cluster(const struct exfat* ef, bool contiguous,
cluster_t current, cluster_t next)
{
off64_t fat_offset;
@@ -204,7 +187,7 @@ static void make_noncontiguous(const struct exfat* ef, cluster_t first,
cluster_t c;
for (c = first; c < last; c++)
- set_next_cluster(ef, 0, c, c + 1);
+ set_next_cluster(ef, false, c, c + 1);
}
static int shrink_file(struct exfat* ef, struct exfat_node* node,
@@ -361,7 +344,8 @@ static int erase_range(struct exfat* ef, struct exfat_node* node,
return 0;
}
-int exfat_truncate(struct exfat* ef, struct exfat_node* node, uint64_t size)
+int exfat_truncate(struct exfat* ef, struct exfat_node* node, uint64_t size,
+ bool erase)
{
uint32_t c1 = bytes2clusters(ef, node->size);
uint32_t c2 = bytes2clusters(ef, size);
@@ -381,9 +365,12 @@ int exfat_truncate(struct exfat* ef, struct exfat_node* node, uint64_t size)
if (rc != 0)
return rc;
- rc = erase_range(ef, node, node->size, size);
- if (rc != 0)
- return rc;
+ if (erase)
+ {
+ rc = erase_range(ef, node, node->size, size);
+ if (rc != 0)
+ return rc;
+ }
exfat_update_mtime(node);
node->size = size;