123f7258a8
The IJG convention is to format copyright notices as: Copyright (C) YYYY, Owner. We try to maintain this convention for any code that is part of the libjpeg API library (with the exception of preserving the copyright notices from Cendio's code verbatim, since those predate libjpeg-turbo.) Note that the phrase "All Rights Reserved" is no longer necessary, since all Buenos Aires Convention signatories signed onto the Berne Convention in 2000. However, our convention is to retain this phrase for any files that have a self-contained copyright header but to leave it off of any files that refer to another file for conditions of distribution and use. For instance, all of the non-SIMD files in the libjpeg API library refer to README.ijg, and the copyright message in that file contains "All Rights Reserved", so it is unnecessary to add it to the individual files. The TurboJPEG code retains my preferred formatting convention for copyright notices, which is based on that of VirtualGL (where the TurboJPEG API originated.)
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/* mdXhl.c * ----------------------------------------------------------------------------
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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, D. R. Commander.
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* Modifications are under the same license as the original code (see above)
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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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char *
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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 *
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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 *
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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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#if _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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char *
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MD5Data (const void *data, unsigned int len, char *buf)
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{
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MD5_CTX ctx;
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MD5Init(&ctx);
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MD5Update(&ctx,data,len);
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return (MD5End(&ctx, buf));
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}
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