The Tor Browser: security/nss/lib/zlib/minigzip.c@b8a032363ba2 (annotated)

security/nss/lib/zlib/minigzip.c@b8a032363ba2 (annotated)

security/nss/lib/zlib/minigzip.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* minigzip.c -- simulate gzip using the zlib compression library
  * Copyright (C) 1995-2006, 2010 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 /*
  * minigzip is a minimal implementation of the gzip utility. This is
  * only an example of using zlib and isn't meant to replace the
  * full-featured gzip. No attempt is made to deal with file systems
  * limiting names to 14 or 8+3 characters, etc... Error checking is
  * very limited. So use minigzip only for testing; use gzip for the
  * real thing. On MSDOS, use only on file names without extension
  * or in pipe mode.
  */
 /* @(#) $Id$ */
 #include "zlib.h"
 #include <stdio.h>
 #ifdef STDC
 #  include <string.h>
 #  include <stdlib.h>
 #endif
 #ifdef USE_MMAP
 #  include <sys/types.h>
 #  include <sys/mman.h>
 #  include <sys/stat.h>
 #endif
 #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
 #  include <fcntl.h>
 #  include <io.h>
 #  ifdef UNDER_CE
 #    include <stdlib.h>
 #  endif
 #  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
 #else
 #  define SET_BINARY_MODE(file)
 #endif
 #ifdef VMS
 #  define unlink delete
 #  define GZ_SUFFIX "-gz"
 #endif
 #ifdef RISCOS
 #  define unlink remove
 #  define GZ_SUFFIX "-gz"
 #  define fileno(file) file->__file
 #endif
 #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
 #  include <unix.h> /* for fileno */
 #endif
 #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
 #ifndef WIN32 /* unlink already in stdio.h for WIN32 */
   extern int unlink OF((const char *));
 #endif
 #endif
 #if defined(UNDER_CE)
 #  include <windows.h>
 #  define perror(s) pwinerror(s)
 /* Map the Windows error number in ERROR to a locale-dependent error
    message string and return a pointer to it.  Typically, the values
    for ERROR come from GetLastError.
    The string pointed to shall not be modified by the application,
    but may be overwritten by a subsequent call to strwinerror
    The strwinerror function does not change the current setting
    of GetLastError.  */
 static char *strwinerror (error)
      DWORD error;
 {
     static char buf[1024];
     wchar_t *msgbuf;
     DWORD lasterr = GetLastError();
     DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
         | FORMAT_MESSAGE_ALLOCATE_BUFFER,
         NULL,
         error,
 , /* Default language */
         (LPVOID)&msgbuf,
 ,
         NULL);
     if (chars != 0) {
         /* If there is an \r\n appended, zap it.  */
         if (chars >= 2
             && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
             chars -= 2;
             msgbuf[chars] = 0;
         }
         if (chars > sizeof (buf) - 1) {
             chars = sizeof (buf) - 1;
             msgbuf[chars] = 0;
         }
         wcstombs(buf, msgbuf, chars + 1);
         LocalFree(msgbuf);
     }
     else {
         sprintf(buf, "unknown win32 error (%ld)", error);
     }
     SetLastError(lasterr);
     return buf;
 }
 static void pwinerror (s)
     const char *s;
 {
     if (s && *s)
         fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ()));
     else
         fprintf(stderr, "%s\n", strwinerror(GetLastError ()));
 }
 #endif /* UNDER_CE */
 #ifndef GZ_SUFFIX
 #  define GZ_SUFFIX ".gz"
 #endif
 #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
 #define BUFLEN      16384
 #define MAX_NAME_LEN 1024
 #ifdef MAXSEG_64K
 #  define local static
    /* Needed for systems with limitation on stack size. */
 #else
 #  define local
 #endif
 char *prog;
 void error            OF((const char *msg));
 void gz_compress      OF((FILE   *in, gzFile out));
 #ifdef USE_MMAP
 int  gz_compress_mmap OF((FILE   *in, gzFile out));
 #endif
 void gz_uncompress    OF((gzFile in, FILE   *out));
 void file_compress    OF((char  *file, char *mode));
 void file_uncompress  OF((char  *file));
 int  main             OF((int argc, char *argv[]));
 /* ===========================================================================
  * Display error message and exit
  */
 void error(msg)
     const char *msg;
 {
     fprintf(stderr, "%s: %s\n", prog, msg);
     exit(1);
 }
 /* ===========================================================================
  * Compress input to output then close both files.
  */
 void gz_compress(in, out)
     FILE   *in;
     gzFile out;
 {
     local char buf[BUFLEN];
     int len;
     int err;
 #ifdef USE_MMAP
     /* Try first compressing with mmap. If mmap fails (minigzip used in a
      * pipe), use the normal fread loop.
      */
     if (gz_compress_mmap(in, out) == Z_OK) return;
 #endif
     for (;;) {
         len = (int)fread(buf, 1, sizeof(buf), in);
         if (ferror(in)) {
             perror("fread");
             exit(1);
         }
         if (len == 0) break;
         if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
     }
     fclose(in);
     if (gzclose(out) != Z_OK) error("failed gzclose");
 }
 #ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
 /* Try compressing the input file at once using mmap. Return Z_OK if
  * if success, Z_ERRNO otherwise.
  */
 int gz_compress_mmap(in, out)
     FILE   *in;
     gzFile out;
 {
     int len;
     int err;
     int ifd = fileno(in);
     caddr_t buf;    /* mmap'ed buffer for the entire input file */
     off_t buf_len;  /* length of the input file */
     struct stat sb;
     /* Determine the size of the file, needed for mmap: */
     if (fstat(ifd, &sb) < 0) return Z_ERRNO;
     buf_len = sb.st_size;
     if (buf_len <= 0) return Z_ERRNO;
     /* Now do the actual mmap: */
     buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
     if (buf == (caddr_t)(-1)) return Z_ERRNO;
     /* Compress the whole file at once: */
     len = gzwrite(out, (char *)buf, (unsigned)buf_len);
     if (len != (int)buf_len) error(gzerror(out, &err));
     munmap(buf, buf_len);
     fclose(in);
     if (gzclose(out) != Z_OK) error("failed gzclose");
     return Z_OK;
 }
 #endif /* USE_MMAP */
 /* ===========================================================================
  * Uncompress input to output then close both files.
  */
 void gz_uncompress(in, out)
     gzFile in;
     FILE   *out;
 {
     local char buf[BUFLEN];
     int len;
     int err;
     for (;;) {
         len = gzread(in, buf, sizeof(buf));
         if (len < 0) error (gzerror(in, &err));
         if (len == 0) break;
         if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
             error("failed fwrite");
         }
     }
     if (fclose(out)) error("failed fclose");
     if (gzclose(in) != Z_OK) error("failed gzclose");
 }
 /* ===========================================================================
  * Compress the given file: create a corresponding .gz file and remove the
  * original.
  */
 void file_compress(file, mode)
     char  *file;
     char  *mode;
 {
     local char outfile[MAX_NAME_LEN];
     FILE  *in;
     gzFile out;
     if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
         fprintf(stderr, "%s: filename too long\n", prog);
         exit(1);
     }
     strcpy(outfile, file);
     strcat(outfile, GZ_SUFFIX);
     in = fopen(file, "rb");
     if (in == NULL) {
         perror(file);
         exit(1);
     }
     out = gzopen(outfile, mode);
     if (out == NULL) {
         fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
         exit(1);
     }
     gz_compress(in, out);
     unlink(file);
 }
 /* ===========================================================================
  * Uncompress the given file and remove the original.
  */
 void file_uncompress(file)
     char  *file;
 {
     local char buf[MAX_NAME_LEN];
     char *infile, *outfile;
     FILE  *out;
     gzFile in;
     size_t len = strlen(file);
     if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
         fprintf(stderr, "%s: filename too long\n", prog);
         exit(1);
     }
     strcpy(buf, file);
     if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
         infile = file;
         outfile = buf;
         outfile[len-3] = '\0';
     } else {
         outfile = file;
         infile = buf;
         strcat(infile, GZ_SUFFIX);
     }
     in = gzopen(infile, "rb");
     if (in == NULL) {
         fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
         exit(1);
     }
     out = fopen(outfile, "wb");
     if (out == NULL) {
         perror(file);
         exit(1);
     }
     gz_uncompress(in, out);
     unlink(infile);
 }
 /* ===========================================================================
  * Usage:  minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...]
  *   -c : write to standard output
  *   -d : decompress
  *   -f : compress with Z_FILTERED
  *   -h : compress with Z_HUFFMAN_ONLY
  *   -r : compress with Z_RLE
  *   -1 to -9 : compression level
  */
 int main(argc, argv)
     int argc;
     char *argv[];
 {
     int copyout = 0;
     int uncompr = 0;
     gzFile file;
     char *bname, outmode[20];
     strcpy(outmode, "wb6 ");
     prog = argv[0];
     bname = strrchr(argv[0], '/');
     if (bname)
       bname++;
     else
       bname = argv[0];
     argc--, argv++;
     if (!strcmp(bname, "gunzip"))
       uncompr = 1;
     else if (!strcmp(bname, "zcat"))
       copyout = uncompr = 1;
     while (argc > 0) {
       if (strcmp(*argv, "-c") == 0)
         copyout = 1;
       else if (strcmp(*argv, "-d") == 0)
         uncompr = 1;
       else if (strcmp(*argv, "-f") == 0)
         outmode[3] = 'f';
       else if (strcmp(*argv, "-h") == 0)
         outmode[3] = 'h';
       else if (strcmp(*argv, "-r") == 0)
         outmode[3] = 'R';
       else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
                (*argv)[2] == 0)
         outmode[2] = (*argv)[1];
       else
         break;
       argc--, argv++;
     }
     if (outmode[3] == ' ')
         outmode[3] = 0;
     if (argc == 0) {
         SET_BINARY_MODE(stdin);
         SET_BINARY_MODE(stdout);
         if (uncompr) {
             file = gzdopen(fileno(stdin), "rb");
             if (file == NULL) error("can't gzdopen stdin");
             gz_uncompress(file, stdout);
         } else {
             file = gzdopen(fileno(stdout), outmode);
             if (file == NULL) error("can't gzdopen stdout");
             gz_compress(stdin, file);
         }
     } else {
         if (copyout) {
             SET_BINARY_MODE(stdout);
         }
         do {
             if (uncompr) {
                 if (copyout) {
                     file = gzopen(*argv, "rb");
                     if (file == NULL)
                         fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
                     else
                         gz_uncompress(file, stdout);
                 } else {
                     file_uncompress(*argv);
                 }
             } else {
                 if (copyout) {
                     FILE * in = fopen(*argv, "rb");
                     if (in == NULL) {
                         perror(*argv);
                     } else {
                         file = gzdopen(fileno(stdout), outmode);
                         if (file == NULL) error("can't gzdopen stdout");
                         gz_compress(in, file);
                     }
                 } else {
                     file_compress(*argv, outmode);
                 }
             }
         } while (argv++, --argc);
     }
     return 0;
 }

The Tor Browser / annotate

security/nss/lib/zlib/minigzip.c@b8a032363ba2 (annotated)

security/nss/lib/zlib/minigzip.c