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Read in blocks rather than one char at a time, greatly improves speed

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Glenn L McGrath 2003-11-14 08:26:25 +00:00
parent 5f28455c6e
commit d09bcecda8
1 changed files with 24 additions and 5 deletions
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29
archival/libunarchive/seek_by_char.c
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@ -14,12 +14,31 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "unarchive.h"
#include <stdlib.h>
extern void seek_by_char(const archive_handle_t *archive_handle, const unsigned int amount)
#include "unarchive.h"
#include "busybox.h"
/* If we are reading through a pipe(), or from stdin then we cant lseek,
* we must read and discard the data to skip over it.
*
* TODO: rename to seek_by_read
*/
extern void seek_by_char(const archive_handle_t *archive_handle, const unsigned int jump_size)
{
unsigned int i;
for (i = 0; i < amount; i++) {
archive_xread_char(archive_handle);
unsigned int remaining = jump_size;
unsigned int read_amount;
RESERVE_CONFIG_BUFFER(buf, BUFSIZ);
while (remaining > 0) {
if (remaining > BUFSIZ) {
read_amount = BUFSIZ;
} else {
read_amount = remaining;
}
read_amount = archive_xread(archive_handle, buf, read_amount);
remaining -= read_amount;
}
RELEASE_CONFIG_BUFFER(buf);
}