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

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

security/nss/lib/zlib/example.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

 /* example.c -- usage example of the zlib compression library
  * Copyright (C) 1995-2006 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 /* @(#) $Id$ */
 #include "zlib.h"
 #include <stdio.h>
 #ifdef STDC
 #  include <string.h>
 #  include <stdlib.h>
 #endif
 #if defined(VMS) || defined(RISCOS)
 #  define TESTFILE "foo-gz"
 #else
 #  define TESTFILE "foo.gz"
 #endif
 #define CHECK_ERR(err, msg) { \
     if (err != Z_OK) { \
         fprintf(stderr, "%s error: %d\n", msg, err); \
         exit(1); \
     } \
 }
 const char hello[] = "hello, hello!";
 /* "hello world" would be more standard, but the repeated "hello"
  * stresses the compression code better, sorry...
  */
 const char dictionary[] = "hello";
 uLong dictId; /* Adler32 value of the dictionary */
 void test_compress      OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 void test_gzio          OF((const char *fname,
                             Byte *uncompr, uLong uncomprLen));
 void test_deflate       OF((Byte *compr, uLong comprLen));
 void test_inflate       OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 void test_large_deflate OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 void test_large_inflate OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 void test_flush         OF((Byte *compr, uLong *comprLen));
 void test_sync          OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 void test_dict_deflate  OF((Byte *compr, uLong comprLen));
 void test_dict_inflate  OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 int  main               OF((int argc, char *argv[]));
 /* ===========================================================================
  * Test compress() and uncompress()
  */
 void test_compress(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     int err;
     uLong len = (uLong)strlen(hello)+1;
     err = compress(compr, &comprLen, (const Bytef*)hello, len);
     CHECK_ERR(err, "compress");
     strcpy((char*)uncompr, "garbage");
     err = uncompress(uncompr, &uncomprLen, compr, comprLen);
     CHECK_ERR(err, "uncompress");
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad uncompress\n");
         exit(1);
     } else {
         printf("uncompress(): %s\n", (char *)uncompr);
     }
 }
 /* ===========================================================================
  * Test read/write of .gz files
  */
 void test_gzio(fname, uncompr, uncomprLen)
     const char *fname; /* compressed file name */
     Byte *uncompr;
     uLong uncomprLen;
 {
 #ifdef NO_GZCOMPRESS
     fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
 #else
     int err;
     int len = (int)strlen(hello)+1;
     gzFile file;
     z_off_t pos;
     file = gzopen(fname, "wb");
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
         exit(1);
     }
     gzputc(file, 'h');
     if (gzputs(file, "ello") != 4) {
         fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
         exit(1);
     }
     if (gzprintf(file, ", %s!", "hello") != 8) {
         fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
         exit(1);
     }
     gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
     gzclose(file);
     file = gzopen(fname, "rb");
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
         exit(1);
     }
     strcpy((char*)uncompr, "garbage");
     if (gzread(file, uncompr, (unsigned)uncomprLen) != len) {
         fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
         exit(1);
     }
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
         exit(1);
     } else {
         printf("gzread(): %s\n", (char*)uncompr);
     }
     pos = gzseek(file, -8L, SEEK_CUR);
     if (pos != 6 || gztell(file) != pos) {
         fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
                 (long)pos, (long)gztell(file));
         exit(1);
     }
     if (gzgetc(file) != ' ') {
         fprintf(stderr, "gzgetc error\n");
         exit(1);
     }
     if (gzungetc(' ', file) != ' ') {
         fprintf(stderr, "gzungetc error\n");
         exit(1);
     }
     gzgets(file, (char*)uncompr, (int)uncomprLen);
     if (strlen((char*)uncompr) != 7) { /* " hello!" */
         fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err));
         exit(1);
     }
     if (strcmp((char*)uncompr, hello + 6)) {
         fprintf(stderr, "bad gzgets after gzseek\n");
         exit(1);
     } else {
         printf("gzgets() after gzseek: %s\n", (char*)uncompr);
     }
     gzclose(file);
 #endif
 }
 /* ===========================================================================
  * Test deflate() with small buffers
  */
 void test_deflate(compr, comprLen)
     Byte *compr;
     uLong comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
     uLong len = (uLong)strlen(hello)+1;
     c_stream.zalloc = (alloc_func)0;
     c_stream.zfree = (free_func)0;
     c_stream.opaque = (voidpf)0;
     err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
     CHECK_ERR(err, "deflateInit");
     c_stream.next_in  = (Bytef*)hello;
     c_stream.next_out = compr;
     while (c_stream.total_in != len && c_stream.total_out < comprLen) {
         c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
         err = deflate(&c_stream, Z_NO_FLUSH);
         CHECK_ERR(err, "deflate");
     }
     /* Finish the stream, still forcing small buffers: */
     for (;;) {
         c_stream.avail_out = 1;
         err = deflate(&c_stream, Z_FINISH);
         if (err == Z_STREAM_END) break;
         CHECK_ERR(err, "deflate");
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
 }
 /* ===========================================================================
  * Test inflate() with small buffers
  */
 void test_inflate(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     int err;
     z_stream d_stream; /* decompression stream */
     strcpy((char*)uncompr, "garbage");
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
     d_stream.next_in  = compr;
     d_stream.avail_in = 0;
     d_stream.next_out = uncompr;
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
     while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
         d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
         err = inflate(&d_stream, Z_NO_FLUSH);
         if (err == Z_STREAM_END) break;
         CHECK_ERR(err, "inflate");
     }
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad inflate\n");
         exit(1);
     } else {
         printf("inflate(): %s\n", (char *)uncompr);
     }
 }
 /* ===========================================================================
  * Test deflate() with large buffers and dynamic change of compression level
  */
 void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
     c_stream.zalloc = (alloc_func)0;
     c_stream.zfree = (free_func)0;
     c_stream.opaque = (voidpf)0;
     err = deflateInit(&c_stream, Z_BEST_SPEED);
     CHECK_ERR(err, "deflateInit");
     c_stream.next_out = compr;
     c_stream.avail_out = (uInt)comprLen;
     /* At this point, uncompr is still mostly zeroes, so it should compress
      * very well:
      */
     c_stream.next_in = uncompr;
     c_stream.avail_in = (uInt)uncomprLen;
     err = deflate(&c_stream, Z_NO_FLUSH);
     CHECK_ERR(err, "deflate");
     if (c_stream.avail_in != 0) {
         fprintf(stderr, "deflate not greedy\n");
         exit(1);
     }
     /* Feed in already compressed data and switch to no compression: */
     deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
     c_stream.next_in = compr;
     c_stream.avail_in = (uInt)comprLen/2;
     err = deflate(&c_stream, Z_NO_FLUSH);
     CHECK_ERR(err, "deflate");
     /* Switch back to compressing mode: */
     deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
     c_stream.next_in = uncompr;
     c_stream.avail_in = (uInt)uncomprLen;
     err = deflate(&c_stream, Z_NO_FLUSH);
     CHECK_ERR(err, "deflate");
     err = deflate(&c_stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         fprintf(stderr, "deflate should report Z_STREAM_END\n");
         exit(1);
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
 }
 /* ===========================================================================
  * Test inflate() with large buffers
  */
 void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     int err;
     z_stream d_stream; /* decompression stream */
     strcpy((char*)uncompr, "garbage");
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
     d_stream.next_in  = compr;
     d_stream.avail_in = (uInt)comprLen;
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
     for (;;) {
         d_stream.next_out = uncompr;            /* discard the output */
         d_stream.avail_out = (uInt)uncomprLen;
         err = inflate(&d_stream, Z_NO_FLUSH);
         if (err == Z_STREAM_END) break;
         CHECK_ERR(err, "large inflate");
     }
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
     if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
         fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
         exit(1);
     } else {
         printf("large_inflate(): OK\n");
     }
 }
 /* ===========================================================================
  * Test deflate() with full flush
  */
 void test_flush(compr, comprLen)
     Byte *compr;
     uLong *comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
     uInt len = (uInt)strlen(hello)+1;
     c_stream.zalloc = (alloc_func)0;
     c_stream.zfree = (free_func)0;
     c_stream.opaque = (voidpf)0;
     err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
     CHECK_ERR(err, "deflateInit");
     c_stream.next_in  = (Bytef*)hello;
     c_stream.next_out = compr;
     c_stream.avail_in = 3;
     c_stream.avail_out = (uInt)*comprLen;
     err = deflate(&c_stream, Z_FULL_FLUSH);
     CHECK_ERR(err, "deflate");
     compr[3]++; /* force an error in first compressed block */
     c_stream.avail_in = len - 3;
     err = deflate(&c_stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         CHECK_ERR(err, "deflate");
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
     *comprLen = c_stream.total_out;
 }
 /* ===========================================================================
  * Test inflateSync()
  */
 void test_sync(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     int err;
     z_stream d_stream; /* decompression stream */
     strcpy((char*)uncompr, "garbage");
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
     d_stream.next_in  = compr;
     d_stream.avail_in = 2; /* just read the zlib header */
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
     d_stream.next_out = uncompr;
     d_stream.avail_out = (uInt)uncomprLen;
     inflate(&d_stream, Z_NO_FLUSH);
     CHECK_ERR(err, "inflate");
     d_stream.avail_in = (uInt)comprLen-2;   /* read all compressed data */
     err = inflateSync(&d_stream);           /* but skip the damaged part */
     CHECK_ERR(err, "inflateSync");
     err = inflate(&d_stream, Z_FINISH);
     if (err != Z_DATA_ERROR) {
         fprintf(stderr, "inflate should report DATA_ERROR\n");
         /* Because of incorrect adler32 */
         exit(1);
     }
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
     printf("after inflateSync(): hel%s\n", (char *)uncompr);
 }
 /* ===========================================================================
  * Test deflate() with preset dictionary
  */
 void test_dict_deflate(compr, comprLen)
     Byte *compr;
     uLong comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
     c_stream.zalloc = (alloc_func)0;
     c_stream.zfree = (free_func)0;
     c_stream.opaque = (voidpf)0;
     err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
     CHECK_ERR(err, "deflateInit");
     err = deflateSetDictionary(&c_stream,
                                (const Bytef*)dictionary, sizeof(dictionary));
     CHECK_ERR(err, "deflateSetDictionary");
     dictId = c_stream.adler;
     c_stream.next_out = compr;
     c_stream.avail_out = (uInt)comprLen;
     c_stream.next_in = (Bytef*)hello;
     c_stream.avail_in = (uInt)strlen(hello)+1;
     err = deflate(&c_stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         fprintf(stderr, "deflate should report Z_STREAM_END\n");
         exit(1);
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
 }
 /* ===========================================================================
  * Test inflate() with a preset dictionary
  */
 void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     int err;
     z_stream d_stream; /* decompression stream */
     strcpy((char*)uncompr, "garbage");
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
     d_stream.next_in  = compr;
     d_stream.avail_in = (uInt)comprLen;
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
     d_stream.next_out = uncompr;
     d_stream.avail_out = (uInt)uncomprLen;
     for (;;) {
         err = inflate(&d_stream, Z_NO_FLUSH);
         if (err == Z_STREAM_END) break;
         if (err == Z_NEED_DICT) {
             if (d_stream.adler != dictId) {
                 fprintf(stderr, "unexpected dictionary");
                 exit(1);
             }
             err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
                                        sizeof(dictionary));
         }
         CHECK_ERR(err, "inflate with dict");
     }
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad inflate with dict\n");
         exit(1);
     } else {
         printf("inflate with dictionary: %s\n", (char *)uncompr);
     }
 }
 /* ===========================================================================
  * Usage:  example [output.gz  [input.gz]]
  */
 int main(argc, argv)
     int argc;
     char *argv[];
 {
     Byte *compr, *uncompr;
     uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
     uLong uncomprLen = comprLen;
     static const char* myVersion = ZLIB_VERSION;
     if (zlibVersion()[0] != myVersion[0]) {
         fprintf(stderr, "incompatible zlib version\n");
         exit(1);
     } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
         fprintf(stderr, "warning: different zlib version\n");
     }
     printf("zlib version %s = 0x%04x, compile flags = 0x%lx\n",
             ZLIB_VERSION, ZLIB_VERNUM, zlibCompileFlags());
     compr    = (Byte*)calloc((uInt)comprLen, 1);
     uncompr  = (Byte*)calloc((uInt)uncomprLen, 1);
     /* compr and uncompr are cleared to avoid reading uninitialized
      * data and to ensure that uncompr compresses well.
      */
     if (compr == Z_NULL || uncompr == Z_NULL) {
         printf("out of memory\n");
         exit(1);
     }
     test_compress(compr, comprLen, uncompr, uncomprLen);
     test_gzio((argc > 1 ? argv[1] : TESTFILE),
               uncompr, uncomprLen);
     test_deflate(compr, comprLen);
     test_inflate(compr, comprLen, uncompr, uncomprLen);
     test_large_deflate(compr, comprLen, uncompr, uncomprLen);
     test_large_inflate(compr, comprLen, uncompr, uncomprLen);
     test_flush(compr, &comprLen);
     test_sync(compr, comprLen, uncompr, uncomprLen);
     comprLen = uncomprLen;
     test_dict_deflate(compr, comprLen);
     test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
     free(compr);
     free(uncompr);
     return 0;
 }

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

security/nss/lib/zlib/example.c