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fd3ced1507
PR: 280784 (exp-run)
Fixes: de13c2427d ("libmd: introduce functions that operate on an fd")
Reviewed by: manpages (bcr), fuz
Differential Revision: https://reviews.freebsd.org/D34502
140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
/*- mdXhl.c
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* SPDX-License-Identifier: Beerware
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*
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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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*/
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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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#include <unistd.h>
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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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#include "mdX.h"
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char *
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MDXEnd(MDX_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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MDXFinal(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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MDXFd(int fd, char *buf)
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{
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return MDXFdChunk(fd, buf, 0, 0);
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}
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char *
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MDXFdChunk(int fd, char *buf, off_t ofs, off_t len)
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{
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unsigned char buffer[16*1024];
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MDX_CTX ctx;
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struct stat stbuf;
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int readrv, e;
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off_t remain;
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if (len < 0) {
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errno = EINVAL;
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return NULL;
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}
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MDXInit(&ctx);
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if (ofs != 0) {
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errno = 0;
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if (lseek(fd, ofs, SEEK_SET) != ofs ||
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(ofs == -1 && errno != 0)) {
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readrv = -1;
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goto error;
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}
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}
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remain = len;
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readrv = 0;
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while (len == 0 || remain > 0) {
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if (len == 0 || remain > sizeof(buffer))
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readrv = read(fd, buffer, sizeof(buffer));
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else
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readrv = read(fd, buffer, remain);
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if (readrv <= 0)
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break;
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MDXUpdate(&ctx, buffer, readrv);
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remain -= readrv;
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}
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error:
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if (readrv < 0)
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return NULL;
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return (MDXEnd(&ctx, buf));
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}
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char *
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MDXFile(const char *filename, char *buf)
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{
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return (MDXFileChunk(filename, buf, 0, 0));
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}
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char *
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MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
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{
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char *ret;
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int e, fd;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return NULL;
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ret = MDXFdChunk(fd, buf, ofs, len);
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e = errno;
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close (fd);
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errno = e;
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return ret;
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}
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char *
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MDXData (const void *data, unsigned int len, char *buf)
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{
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MDX_CTX ctx;
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MDXInit(&ctx);
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MDXUpdate(&ctx,data,len);
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return (MDXEnd(&ctx, buf));
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}
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#ifdef WEAK_REFS
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/* When building libmd, provide weak references. Note: this is not
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activated in the context of compiling these sources for internal
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use in libcrypt.
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*/
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#undef MDXEnd
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__weak_reference(_libmd_MDXEnd, MDXEnd);
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#undef MDXFile
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__weak_reference(_libmd_MDXFile, MDXFile);
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#undef MDXFileChunk
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__weak_reference(_libmd_MDXFileChunk, MDXFileChunk);
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#undef MDXFd
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__weak_reference(_libmd_MDXFd, MDXFd);
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#undef MDXFdChunk
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__weak_reference(_libmd_MDXFdChunk, MDXFdChunk);
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#undef MDXData
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__weak_reference(_libmd_MDXData, MDXData);
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#endif
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