ucx: src/utils.c@3390b58ad15a

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  *

     4  * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions are met:

     8  *

     9  *   1. Redistributions of source code must retain the above copyright

    10  *      notice, this list of conditions and the following disclaimer.

    11  *

    12  *   2. Redistributions in binary form must reproduce the above copyright

    13  *      notice, this list of conditions and the following disclaimer in the

    14  *      documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    26  * POSSIBILITY OF SUCH DAMAGE.

    27  */

    29 #include "cx/utils.h"

    31 #define CX_STREAM_BCOPY_BUF_SIZE 8192

    32 #define CX_STREAM_COPY_BUF_SIZE 1024

    34 size_t cx_stream_bncopy(

    35         void *src,

    36         void *dest,

    37         cx_read_func rfnc,

    38         cx_write_func wfnc,

    39         char *buf,

    40         size_t bufsize,

    41         size_t n

    42 ) {

    43     if (n == 0) {

    44         return 0;

    45     }

    47     char *lbuf;

    48     size_t ncp = 0;

    50     if (buf) {

    51         if (bufsize == 0) return 0;

    52         lbuf = buf;

    53     } else {

    54         if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE;

    55         lbuf = malloc(bufsize);

    56         if (lbuf == NULL) {

    57             return 0;

    58         }

    59     }

    61     size_t r;

    62     size_t rn = bufsize > n ? n : bufsize;

    63     while ((r = rfnc(lbuf, 1, rn, src)) != 0) {

    64         r = wfnc(lbuf, 1, r, dest);

    65         ncp += r;

    66         n -= r;

    67         rn = bufsize > n ? n : bufsize;

    68         if (r == 0 || n == 0) {

    69             break;

    70         }

    71     }

    73     if (lbuf != buf) {

    74         free(lbuf);

    75     }

    77     return ncp;

    78 }

    80 size_t cx_stream_ncopy(

    81         void *src,

    82         void *dest,

    83         cx_read_func rfnc,

    84         cx_write_func wfnc,

    85         size_t n

    86 ) {

    87     char buf[CX_STREAM_COPY_BUF_SIZE];

    88     return cx_stream_bncopy(src, dest, rfnc, wfnc,

    89                             buf, CX_STREAM_COPY_BUF_SIZE, n);

    90 }

    92 #ifndef CX_SZMUL_BUILTIN

    93 #include "szmul.c"

    94 #endif

Mercurial > hg > ucx / file revision