--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/streams.c Sat Nov 02 13:48:53 2024 +0100
@@ -0,0 +1,95 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cx/streams.h"
+
+#ifndef CX_STREAM_BCOPY_BUF_SIZE
+#define CX_STREAM_BCOPY_BUF_SIZE 8192
+#endif
+
+#ifndef CX_STREAM_COPY_BUF_SIZE
+#define CX_STREAM_COPY_BUF_SIZE 1024
+#endif
+
+size_t cx_stream_bncopy(
+ void *src,
+ void *dest,
+ cx_read_func rfnc,
+ cx_write_func wfnc,
+ char *buf,
+ size_t bufsize,
+ size_t n
+) {
+ if (n == 0) {
+ return 0;
+ }
+
+ char *lbuf;
+ size_t ncp = 0;
+
+ if (buf) {
+ if (bufsize == 0) return 0;
+ lbuf = buf;
+ } else {
+ if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE;
+ lbuf = malloc(bufsize);
+ if (lbuf == NULL) {
+ return 0;
+ }
+ }
+
+ size_t r;
+ size_t rn = bufsize > n ? n : bufsize;
+ while ((r = rfnc(lbuf, 1, rn, src)) != 0) {
+ r = wfnc(lbuf, 1, r, dest);
+ ncp += r;
+ n -= r;
+ rn = bufsize > n ? n : bufsize;
+ if (r == 0 || n == 0) {
+ break;
+ }
+ }
+
+ if (lbuf != buf) {
+ free(lbuf);
+ }
+
+ return ncp;
+}
+
+size_t cx_stream_ncopy(
+ void *src,
+ void *dest,
+ cx_read_func rfnc,
+ cx_write_func wfnc,
+ size_t n
+) {
+ char buf[CX_STREAM_COPY_BUF_SIZE];
+ return cx_stream_bncopy(src, dest, rfnc, wfnc,
+ buf, CX_STREAM_COPY_BUF_SIZE, n);
+}