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125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/* mdXhl.c
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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* libjpeg-turbo Modifications:
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* Copyright (C)2016, 2018-2019 D. R. Commander. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the libjpeg-turbo Project nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef _WIN32
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#include <io.h>
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#define close _close
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#define fstat _fstat
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#define lseek _lseek
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#define read _read
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#define stat _stat
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#else
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define LENGTH 16
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#include "./md5.h"
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static char *MD5End(MD5_CTX *ctx, char *buf)
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{
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int i;
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unsigned char digest[LENGTH];
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static const char hex[] = "0123456789abcdef";
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if (!buf)
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buf = malloc(2 * LENGTH + 1);
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if (!buf)
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return 0;
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MD5Final(digest, ctx);
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for (i = 0; i < LENGTH; i++) {
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buf[i + i] = hex[digest[i] >> 4];
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buf[i + i + 1] = hex[digest[i] & 0x0f];
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}
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buf[i + i] = '\0';
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return buf;
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}
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char *MD5File(const char *filename, char *buf)
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{
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return (MD5FileChunk(filename, buf, 0, 0));
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}
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char *MD5FileChunk(const char *filename, char *buf, off_t ofs, off_t len)
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{
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unsigned char buffer[BUFSIZ];
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MD5_CTX ctx;
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struct stat stbuf;
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int f, i, e;
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off_t n;
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MD5Init(&ctx);
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#ifdef _WIN32
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f = _open(filename, O_RDONLY | O_BINARY);
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#else
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f = open(filename, O_RDONLY);
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#endif
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if (f < 0)
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return 0;
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if (fstat(f, &stbuf) < 0)
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return 0;
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if (ofs > stbuf.st_size)
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ofs = stbuf.st_size;
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if ((len == 0) || (len > stbuf.st_size - ofs))
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len = stbuf.st_size - ofs;
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if (lseek(f, ofs, SEEK_SET) < 0)
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return 0;
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n = len;
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i = 0;
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while (n > 0) {
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if (n > sizeof(buffer))
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i = read(f, buffer, sizeof(buffer));
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else
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i = read(f, buffer, n);
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if (i < 0)
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break;
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MD5Update(&ctx, buffer, i);
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n -= i;
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}
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e = errno;
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close(f);
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errno = e;
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if (i < 0)
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return 0;
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return (MD5End(&ctx, buf));
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}
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