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- /*-
- * Copyright 2003,2004 Colin Percival
- * All rights reserved
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted providing that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * Changelog:
- * 2005-04-26 - Define the header as a C structure, add a CRC32 checksum to
- * the header, and make all the types 32-bit.
- * --Benjamin Smedberg <benjamin@smedbergs.us>
- * 2007-11-14 - Added CalculateCrc() and ApplyBinaryPatch() methods.
- * --Rahul Kuchhal
- * 2016-07-27 - Improve validation of diffs.
- * --Ricky Zhou
- */
- #include "mbspatch.h"
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <fcntl.h>
- #include <string.h>
- #include <limits.h>
- #ifdef _WIN32
- # include <io.h>
- # include <winsock2.h>
- #else
- # include <unistd.h>
- # include <arpa/inet.h>
- #endif
- extern "C" {
- #include <7zCrc.h>
- }
- #ifndef SSIZE_MAX
- # define SSIZE_MAX LONG_MAX
- #endif
- int
- MBS_ReadHeader(int fd, MBSPatchHeader *header)
- {
- int s = read(fd, header, sizeof(MBSPatchHeader));
- if (s != sizeof(MBSPatchHeader))
- return READ_ERROR;
- header->slen = ntohl(header->slen);
- header->scrc32 = ntohl(header->scrc32);
- header->dlen = ntohl(header->dlen);
- header->cblen = ntohl(header->cblen);
- header->difflen = ntohl(header->difflen);
- header->extralen = ntohl(header->extralen);
- struct stat hs;
- s = fstat(fd, &hs);
- if (s != 0)
- return READ_ERROR;
- if (memcmp(header->tag, "MBDIFF10", 8) != 0)
- return UNEXPECTED_ERROR;
- if (hs.st_size > INT_MAX)
- return UNEXPECTED_ERROR;
- size_t size = static_cast<size_t>(hs.st_size);
- if (size < sizeof(MBSPatchHeader))
- return UNEXPECTED_ERROR;
- size -= sizeof(MBSPatchHeader);
- if (size < header->cblen)
- return UNEXPECTED_ERROR;
- size -= header->cblen;
- if (size < header->difflen)
- return UNEXPECTED_ERROR;
- size -= header->difflen;
- if (size < header->extralen)
- return UNEXPECTED_ERROR;
- size -= header->extralen;
- if (size != 0)
- return UNEXPECTED_ERROR;
- return OK;
- }
- int
- MBS_ApplyPatch(const MBSPatchHeader *header, int patchfd,
- unsigned char *fbuffer, int filefd)
- {
- unsigned char *fbufstart = fbuffer;
- unsigned char *fbufend = fbuffer + header->slen;
- unsigned char *buf = (unsigned char*) malloc(header->cblen +
- header->difflen +
- header->extralen);
- if (!buf)
- return MEM_ERROR;
- int rv = OK;
- int r = header->cblen + header->difflen + header->extralen;
- unsigned char *wb = buf;
- while (r) {
- int c = read(patchfd, wb, (r > SSIZE_MAX) ? SSIZE_MAX : r);
- if (c < 0) {
- rv = READ_ERROR;
- goto end;
- }
- r -= c;
- wb += c;
- if (c == 0 && r) {
- rv = UNEXPECTED_ERROR;
- goto end;
- }
- }
- {
- MBSPatchTriple *ctrlsrc = (MBSPatchTriple*) buf;
- if (header->cblen % sizeof(MBSPatchTriple) != 0) {
- rv = UNEXPECTED_ERROR;
- goto end;
- }
- unsigned char *diffsrc = buf + header->cblen;
- unsigned char *extrasrc = diffsrc + header->difflen;
- MBSPatchTriple *ctrlend = (MBSPatchTriple*) diffsrc;
- unsigned char *diffend = extrasrc;
- unsigned char *extraend = extrasrc + header->extralen;
- while (ctrlsrc < ctrlend) {
- ctrlsrc->x = ntohl(ctrlsrc->x);
- ctrlsrc->y = ntohl(ctrlsrc->y);
- ctrlsrc->z = ntohl(ctrlsrc->z);
- #ifdef DEBUG_bsmedberg
- printf("Applying block:\n"
- " x: %u\n"
- " y: %u\n"
- " z: %i\n",
- ctrlsrc->x,
- ctrlsrc->y,
- ctrlsrc->z);
- #endif
- /* Add x bytes from oldfile to x bytes from the diff block */
- if (ctrlsrc->x > static_cast<size_t>(fbufend - fbuffer) ||
- ctrlsrc->x > static_cast<size_t>(diffend - diffsrc)) {
- rv = UNEXPECTED_ERROR;
- goto end;
- }
- for (unsigned int i = 0; i < ctrlsrc->x; ++i) {
- diffsrc[i] += fbuffer[i];
- }
- if ((int) write(filefd, diffsrc, ctrlsrc->x) != ctrlsrc->x) {
- rv = WRITE_ERROR;
- goto end;
- }
- fbuffer += ctrlsrc->x;
- diffsrc += ctrlsrc->x;
- /* Copy y bytes from the extra block */
- if (ctrlsrc->y > static_cast<size_t>(extraend - extrasrc)) {
- rv = UNEXPECTED_ERROR;
- goto end;
- }
- if ((int) write(filefd, extrasrc, ctrlsrc->y) != ctrlsrc->y) {
- rv = WRITE_ERROR;
- goto end;
- }
- extrasrc += ctrlsrc->y;
- /* "seek" forwards in oldfile by z bytes */
- if (ctrlsrc->z < fbufstart - fbuffer ||
- ctrlsrc->z > fbufend - fbuffer) {
- rv = UNEXPECTED_ERROR;
- goto end;
- }
- fbuffer += ctrlsrc->z;
- /* and on to the next control block */
- ++ctrlsrc;
- }
- }
- end:
- free(buf);
- return rv;
- }
- int CalculateCrc(const unsigned char *buf, int size) {
- CrcGenerateTable();
- unsigned int crc = 0xffffffffL;
- crc = ~CrcCalc(buf, size);
- return crc;
- }
- /* _O_BINARY is a MSWindows open() mode flag. When absent, MSWindows
- * open() translates CR+LF to LF; when present, it passes bytes
- * through faithfully. Under *nix, we are always in binary mode, so
- * the following #define turns this flag into a no-op w.r.t. bitwise
- * OR. Note that this would be DANGEROUS AND UNSOUND if we used
- * _O_BINARY other than as a bitwise OR mask (e.g., as a bitwise AND
- * mask to check for binary mode), but it seems OK in the limited
- * context of the following small function. */
- #ifndef _O_BINARY
- # define _O_BINARY 0
- #endif
- int ApplyBinaryPatch(const wchar_t *old_file, const wchar_t *patch_file,
- const wchar_t *new_file) {
- int ret = OK;
- int ofd = -1;
- int nfd = -1;
- unsigned char *buf = NULL;
- int pfd = _wopen(patch_file, O_RDONLY | _O_BINARY);
- if (pfd < 0) return READ_ERROR;
- do {
- MBSPatchHeader header;
- if ((ret = MBS_ReadHeader(pfd, &header)))
- break;
- ofd = _wopen(old_file, O_RDONLY | _O_BINARY);
- if (ofd < 0) {
- ret = READ_ERROR;
- break;
- }
- struct stat os;
- if ((ret = fstat(ofd, &os))) {
- ret = READ_ERROR;
- break;
- }
- if (os.st_size != header.slen) {
- ret = UNEXPECTED_ERROR;
- break;
- }
- buf = (unsigned char*) malloc(header.slen);
- if (!buf) {
- ret = MEM_ERROR;
- break;
- }
- if (read(ofd, buf, header.slen) != header.slen) {
- ret = READ_ERROR;
- break;
- }
- if (CalculateCrc(buf, header.slen) != header.scrc32) {
- ret = CRC_ERROR;
- break;
- }
- nfd = _wopen(new_file, O_WRONLY | O_TRUNC | O_CREAT | _O_BINARY);
- if (nfd < 0) {
- ret = READ_ERROR;
- break;
- }
- ret = MBS_ApplyPatch(&header, pfd, buf, nfd);
- } while (0);
- free(buf);
- close(pfd);
- if (ofd >= 0) close(ofd);
- if (nfd >= 0) close(nfd);
- return ret;
- }
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