comparison: ucx/streams.c
ucx/streams.c
- changeset 101
- 7b3a3130be44
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| 100:d2bd73d28ff1 | 101:7b3a3130be44 |
|---|---|
| 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 */ | |
| 28 | |
| 29 #include "cx/streams.h" | |
| 30 | |
| 31 #ifndef CX_STREAM_BCOPY_BUF_SIZE | |
| 32 #define CX_STREAM_BCOPY_BUF_SIZE 8192 | |
| 33 #endif | |
| 34 | |
| 35 #ifndef CX_STREAM_COPY_BUF_SIZE | |
| 36 #define CX_STREAM_COPY_BUF_SIZE 1024 | |
| 37 #endif | |
| 38 | |
| 39 size_t cx_stream_bncopy( | |
| 40 void *src, | |
| 41 void *dest, | |
| 42 cx_read_func rfnc, | |
| 43 cx_write_func wfnc, | |
| 44 char *buf, | |
| 45 size_t bufsize, | |
| 46 size_t n | |
| 47 ) { | |
| 48 if (n == 0) { | |
| 49 return 0; | |
| 50 } | |
| 51 | |
| 52 char *lbuf; | |
| 53 size_t ncp = 0; | |
| 54 | |
| 55 if (buf) { | |
| 56 if (bufsize == 0) return 0; | |
| 57 lbuf = buf; | |
| 58 } else { | |
| 59 if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE; | |
| 60 lbuf = malloc(bufsize); | |
| 61 if (lbuf == NULL) return 0; | |
| 62 } | |
| 63 | |
| 64 size_t r; | |
| 65 size_t rn = bufsize > n ? n : bufsize; | |
| 66 while ((r = rfnc(lbuf, 1, rn, src)) != 0) { | |
| 67 r = wfnc(lbuf, 1, r, dest); | |
| 68 ncp += r; | |
| 69 n -= r; | |
| 70 rn = bufsize > n ? n : bufsize; | |
| 71 if (r == 0 || n == 0) { | |
| 72 break; | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 if (lbuf != buf) { | |
| 77 free(lbuf); | |
| 78 } | |
| 79 | |
| 80 return ncp; | |
| 81 } | |
| 82 | |
| 83 size_t cx_stream_ncopy( | |
| 84 void *src, | |
| 85 void *dest, | |
| 86 cx_read_func rfnc, | |
| 87 cx_write_func wfnc, | |
| 88 size_t n | |
| 89 ) { | |
| 90 char buf[CX_STREAM_COPY_BUF_SIZE]; | |
| 91 return cx_stream_bncopy(src, dest, rfnc, wfnc, | |
| 92 buf, CX_STREAM_COPY_BUF_SIZE, n); | |
| 93 } |
