don't seek when opening

If the input is a stream, it will always fail.

diff --git a/kurl.c b/kurl.c
index 0074c544ca7dcecf0ac764f4f0d083d52a39f9c9..4202d1013f69790b6dd08bedb5c15e45e60ec82b 100644 (file)
--- a/kurl.c
+++ b/kurl.c
@@ -50,10 +50,10 @@ void kurl_destroy(void)
        curl_global_cleanup();
 }
 
-static int prepare(kurl_t *ku)
+static int prepare(kurl_t *ku, int do_seek)
 {
        if (kurl_isfile(ku)) {
-               if (lseek(ku->fd, ku->off0, SEEK_SET) != ku->off0)
+               if (do_seek && lseek(ku->fd, ku->off0, SEEK_SET) != ku->off0)
                        return -1;
        } else { // FIXME: for S3, we need to re-authorize
                int rc;
@@ -181,7 +181,7 @@ kurl_t *kurl_open(const char *url, kurl_opt_t *opt)
                ku->m_buf = CURL_MAX_WRITE_SIZE * 2; // for remote files, the buffer set to 2*CURL_MAX_WRITE_SIZE
        ku->buf = (uint8_t*)calloc(ku->m_buf, 1);
        if (kurl_isfile(ku)) failed = (fill_buffer(ku) <= 0);
-       else failed = (prepare(ku) < 0 || fill_buffer(ku) <= 0);
+       else failed = (prepare(ku, 0) < 0 || fill_buffer(ku) <= 0);
        if (failed) {
                kurl_close(ku);
                return 0;
@@ -196,7 +196,7 @@ kurl_t *kurl_dopen(int fd)
        ku->fd = fd;
        ku->m_buf = KU_DEF_BUFLEN;
        ku->buf = (uint8_t*)calloc(ku->m_buf, 1);
-       if (prepare(ku) < 0 || fill_buffer(ku) <= 0) {
+       if (prepare(ku, 0) < 0 || fill_buffer(ku) <= 0) {
                kurl_close(ku);
                return 0;
        }
@@ -259,7 +259,7 @@ off_t kurl_seek(kurl_t *ku, off_t offset, int whence) // FIXME: sometimes when s
        if (seek_end || new_off < cur_off || new_off - cur_off > KU_MAX_SKIP) { // if jump is large, do actual seek
                ku->off0 = new_off;
                ku->done_reading = 0;
-               if (prepare(ku) < 0 || fill_buffer(ku) <= 0) failed = 1;
+               if (prepare(ku, 1) < 0 || fill_buffer(ku) <= 0) failed = 1;
        } else { // if jump is small, read through
                off_t r;
                r = kurl_read(ku, 0, new_off - cur_off);