int
write_block(partition_map_header *map, unsigned long num, char *buf)
{
int f;
f = map->logical_block / PBLOCK_SIZE;
return write_media(map->fd, num*f, buf);
}
long
write_deblock_media(MEDIA m, long long offset, unsigned long count, void *address)
{
DEBLOCK_MEDIA a;
long rtn_value;
unsigned long next_size;
unsigned long partial_offset;
unsigned long partial_count;
long long cur_offset;
unsigned long remainder;
unsigned char *addr;
a = (DEBLOCK_MEDIA) m;
rtn_value = 0;
if (a == 0) {
/* no media */
} else if (a->m.kind != deblock_info.kind) {
/* wrong kind - XXX need to error here - this is an internal problem */
} else if (count <= 0 || count % a->m.grain != 0) {
/* can't handle size */
} else if (offset < 0 || offset % a->m.grain != 0) {
/* can't handle offset */
} else if (a->need_filtering == 0) {
rtn_value = write_media(a->next_media, offset, count, address);
} else {
next_size = a->next_block_size;
addr = address;
cur_offset = offset;
remainder = count;
rtn_value = 1;
/* write partial */
partial_offset = cur_offset % next_size;
if (partial_offset != 0) {
partial_count = next_size - partial_offset;
if (partial_count > remainder) {
partial_count = remainder;
}
rtn_value = read_media(a->next_media, cur_offset - partial_offset, next_size, a->buffer);
if (rtn_value != 0) {
memcpy (a->buffer + partial_offset, addr, partial_count);
rtn_value = write_media(a->next_media, cur_offset - partial_offset, next_size, a->buffer);
addr += partial_count;
cur_offset += partial_count;
remainder -= partial_count;
}
}
/* write fulls as long as needed */
if (rtn_value != 0 && remainder > next_size) {
partial_count = remainder - (remainder % next_size);
rtn_value = write_media(a->next_media, cur_offset, partial_count, addr);
addr += partial_count;
cur_offset += partial_count;
remainder -= partial_count;
}
/* write partial */
if (rtn_value != 0 && remainder > 0) {
partial_count = remainder;
rtn_value = read_media(a->next_media, cur_offset, next_size, a->buffer);
if (rtn_value != 0) {
memcpy (a->buffer, addr, partial_count);
rtn_value = write_media(a->next_media, cur_offset, next_size, a->buffer);
}
}
}
/* recompute size to handle file media */
a->m.size_in_bytes = media_total_size(a->next_media);
return rtn_value;
}
int
write_block(partition_map_header *map, unsigned long num, char *buf)
{
return write_media(map->m, ((long long) num) * map->logical_block,
PBLOCK_SIZE, (void *)buf);
}
