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[xferbuf] Silently discard data written to a void data transfer buffer

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Allow data to be successfully written (and discarded) to a void data
transfer buffer, rather than throwing an error.  This allows a void
data transfer buffer to be used when determining the length of a file
downloaded from a TFTP server that does not support the "tsize" option
defined in RFC 2349.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2026-02-25 00:14:26 +00:00
parent 3194c8ad0a
commit b48965ae57
1 changed files with 3 additions and 6 deletions
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9
src/core/xferbuf.c
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@ -129,13 +129,10 @@ int xferbuf_write ( struct xfer_buffer *xferbuf, size_t offset,
if ( ( rc = xferbuf_ensure_size ( xferbuf, max_len ) ) != 0 )
return rc;
/* Check that buffer is non-void */
if ( len && ( ! xferbuf->data ) )
return -ENOTTY;
/* Copy data to buffer */
/* Copy data to buffer (if non-void) */
profile_start ( &xferbuf_write_profiler );
memcpy ( ( xferbuf->data + offset ), data, len );
if ( xferbuf->data )
memcpy ( ( xferbuf->data + offset ), data, len );
profile_stop ( &xferbuf_write_profiler );
return 0;