118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* Copyright (C) 2007 Greg Lewis. 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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#ifndef BUFSIZ
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#define BUFSIZ 0x10000
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#endif
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int
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main(int argc, char* argv[]) {
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char *key;
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char *oname;
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char buf[BUFSIZ];
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size_t keylen, olen;
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int ifd, ofd, i, fileoff = 0, bufoff = 0, buflen = 0, eof = 0;
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ssize_t bytes;
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if (argc < 3) {
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errx(1, "Usage: x_x2zip <key> <file>");
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}
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// Key
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key = argv[1];
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keylen = strlen(key);
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// Open input file
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if ((ifd = open(argv[2], O_RDONLY)) == -1) {
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err(1, "Can't open input file %s", argv[2]);
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}
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// Open output file
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olen = strlen(argv[2]) + 5;
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if ((oname = (char *) malloc(olen)) == NULL) {
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err(1, "Can't create output file name");
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}
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if (strlcpy(oname, argv[2], olen) >= olen) {
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err(1, "Can't create output file name");
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}
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if (strlcat(oname, ".zip", olen) >= olen) {
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err(1, "Can't create output file name");
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}
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if ((ofd = open(oname,
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O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR)) == -1) {
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err(1, "Can't open output file %s", oname);
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}
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free(oname);
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while (!eof) {
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// Read into the buffer
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bufoff = 0;
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buflen = 0;
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while (1) {
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if (buflen >= BUFSIZ) {
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break;
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}
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if ((bytes = read(ifd, buf, BUFSIZ - buflen)) == -1) {
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err(1, "Error reading input file");
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}
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if (!bytes) {
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eof = 1;
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break;
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}
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buflen += bytes;
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}
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// Decrypt
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for (i = 0; i < buflen; i++) {
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buf[i] = buf[i] ^ key[(fileoff + i) % keylen];
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}
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// Update file offset
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fileoff += buflen;
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// Output the buffer
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bufoff = 0;
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while (bufoff < buflen) {
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if ((bytes = write(ofd, buf + bufoff, buflen - bufoff)) == -1) {
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err(1, "Error writing output file");
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}
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bufoff += bytes;
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}
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}
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return 0;
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}
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