universe@483: /*
universe@483:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@483:  *
universe@483:  * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
universe@483:  *
universe@483:  * Redistribution and use in source and binary forms, with or without
universe@483:  * modification, are permitted provided that the following conditions are met:
universe@483:  *
universe@483:  *   1. Redistributions of source code must retain the above copyright
universe@483:  *      notice, this list of conditions and the following disclaimer.
universe@483:  *
universe@483:  *   2. Redistributions in binary form must reproduce the above copyright
universe@483:  *      notice, this list of conditions and the following disclaimer in the
universe@483:  *      documentation and/or other materials provided with the distribution.
universe@483:  *
universe@483:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@483:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@483:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@483:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@483:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@483:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@483:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@483:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@483:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@483:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@483:  * POSSIBILITY OF SUCH DAMAGE.
universe@483:  */
universe@483: 
universe@483: #include "cx/utils.h"
universe@483: 
universe@736: #ifndef CX_STREAM_BCOPY_BUF_SIZE
universe@674: #define CX_STREAM_BCOPY_BUF_SIZE 8192
universe@736: #endif
universe@736: 
universe@736: #ifndef CX_STREAM_COPY_BUF_SIZE
universe@674: #define CX_STREAM_COPY_BUF_SIZE 1024
universe@736: #endif
universe@674: 
universe@674: size_t cx_stream_bncopy(
universe@674:         void *src,
universe@674:         void *dest,
universe@674:         cx_read_func rfnc,
universe@674:         cx_write_func wfnc,
universe@674:         char *buf,
universe@674:         size_t bufsize,
universe@674:         size_t n
universe@674: ) {
universe@674:     if (n == 0) {
universe@483:         return 0;
universe@483:     }
universe@674: 
universe@674:     char *lbuf;
universe@674:     size_t ncp = 0;
universe@674: 
universe@674:     if (buf) {
universe@674:         if (bufsize == 0) return 0;
universe@674:         lbuf = buf;
universe@674:     } else {
universe@674:         if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE;
universe@674:         lbuf = malloc(bufsize);
universe@674:         if (lbuf == NULL) {
universe@674:             return 0;
universe@674:         }
universe@674:     }
universe@674: 
universe@674:     size_t r;
universe@674:     size_t rn = bufsize > n ? n : bufsize;
universe@674:     while ((r = rfnc(lbuf, 1, rn, src)) != 0) {
universe@674:         r = wfnc(lbuf, 1, r, dest);
universe@674:         ncp += r;
universe@674:         n -= r;
universe@674:         rn = bufsize > n ? n : bufsize;
universe@674:         if (r == 0 || n == 0) {
universe@674:             break;
universe@674:         }
universe@674:     }
universe@674: 
universe@674:     if (lbuf != buf) {
universe@674:         free(lbuf);
universe@674:     }
universe@674: 
universe@674:     return ncp;
universe@674: }
universe@674: 
universe@674: size_t cx_stream_ncopy(
universe@674:         void *src,
universe@674:         void *dest,
universe@674:         cx_read_func rfnc,
universe@674:         cx_write_func wfnc,
universe@674:         size_t n
universe@674: ) {
universe@675:     char buf[CX_STREAM_COPY_BUF_SIZE];
universe@675:     return cx_stream_bncopy(src, dest, rfnc, wfnc,
universe@675:                             buf, CX_STREAM_COPY_BUF_SIZE, n);
universe@483: }
universe@674: 
universe@674: #ifndef CX_SZMUL_BUILTIN
universe@674: #include "szmul.c"
universe@483: #endif