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annotate packages/services/compress/zlib/current/src/example.c @ 1369:c92d7972c02c

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* tests/zlib[12].c: Modified the text to the gcc3.3 friendly. * Upgrade to zlib 1.1.4 and additional fix for inflate bug on machines with 16-bit pointers.
author asl
date Thu, 20 Nov 2003 09:28:06 +0000
parents b939e9cada46
children 91a37e2314f4
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1 /* example.c -- usage example of the zlib compression library
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c92d7972c02c * tests/zlib[12].c: Modified the text to the gcc3.3 friendly.
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2 * Copyright (C) 1995-2002 Jean-loup Gailly.
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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6 /* @(#) $Id$ */
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7
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8 #include <stdio.h>
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9 #include "zlib.h"
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10
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11 #ifdef STDC
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12 # include <string.h>
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13 # include <stdlib.h>
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14 #else
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15 extern void exit OF((int));
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16 #endif
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17
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18 #if defined(VMS) || defined(RISCOS)
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19 # define TESTFILE "foo-gz"
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20 #else
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21 # define TESTFILE "foo.gz"
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22 #endif
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23
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24 #define CHECK_ERR(err, msg) { \
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25 if (err != Z_OK) { \
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26 fprintf(stderr, "%s error: %d\n", msg, err); \
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27 exit(1); \
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28 } \
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29 }
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30
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31 const char hello[] = "hello, hello!";
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32 /* "hello world" would be more standard, but the repeated "hello"
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33 * stresses the compression code better, sorry...
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34 */
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35
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36 const char dictionary[] = "hello";
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37 uLong dictId; /* Adler32 value of the dictionary */
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38
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39 void test_compress OF((Byte *compr, uLong comprLen,
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40 Byte *uncompr, uLong uncomprLen));
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41 void test_gzio OF((const char *out, const char *in,
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42 Byte *uncompr, int uncomprLen));
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43 void test_deflate OF((Byte *compr, uLong comprLen));
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44 void test_inflate OF((Byte *compr, uLong comprLen,
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45 Byte *uncompr, uLong uncomprLen));
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46 void test_large_deflate OF((Byte *compr, uLong comprLen,
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47 Byte *uncompr, uLong uncomprLen));
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48 void test_large_inflate OF((Byte *compr, uLong comprLen,
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49 Byte *uncompr, uLong uncomprLen));
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50 void test_flush OF((Byte *compr, uLong *comprLen));
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51 void test_sync OF((Byte *compr, uLong comprLen,
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52 Byte *uncompr, uLong uncomprLen));
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53 void test_dict_deflate OF((Byte *compr, uLong comprLen));
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54 void test_dict_inflate OF((Byte *compr, uLong comprLen,
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55 Byte *uncompr, uLong uncomprLen));
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56 int main OF((int argc, char *argv[]));
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57
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58 /* ===========================================================================
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59 * Test compress() and uncompress()
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60 */
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61 void test_compress(compr, comprLen, uncompr, uncomprLen)
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62 Byte *compr, *uncompr;
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63 uLong comprLen, uncomprLen;
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64 {
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65 int err;
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66 uLong len = strlen(hello)+1;
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67
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68 err = compress(compr, &comprLen, (const Bytef*)hello, len);
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69 CHECK_ERR(err, "compress");
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70
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71 strcpy((char*)uncompr, "garbage");
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72
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73 err = uncompress(uncompr, &uncomprLen, compr, comprLen);
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74 CHECK_ERR(err, "uncompress");
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75
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76 if (strcmp((char*)uncompr, hello)) {
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77 fprintf(stderr, "bad uncompress\n");
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78 exit(1);
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79 } else {
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80 printf("uncompress(): %s\n", (char *)uncompr);
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81 }
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82 }
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83
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84 /* ===========================================================================
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85 * Test read/write of .gz files
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86 */
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87 void test_gzio(out, in, uncompr, uncomprLen)
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88 const char *out; /* compressed output file */
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89 const char *in; /* compressed input file */
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90 Byte *uncompr;
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91 int uncomprLen;
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92 {
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93 int err;
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94 int len = strlen(hello)+1;
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95 gzFile file;
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96 z_off_t pos;
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97
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98 file = gzopen(out, "wb");
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99 if (file == NULL) {
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100 fprintf(stderr, "gzopen error\n");
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101 exit(1);
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102 }
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103 gzputc(file, 'h');
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104 if (gzputs(file, "ello") != 4) {
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105 fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
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106 exit(1);
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107 }
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108 if (gzprintf(file, ", %s!", "hello") != 8) {
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109 fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
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110 exit(1);
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111 }
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112 gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
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113 gzclose(file);
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114
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115 file = gzopen(in, "rb");
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116 if (file == NULL) {
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117 fprintf(stderr, "gzopen error\n");
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118 }
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119 strcpy((char*)uncompr, "garbage");
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120
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121 uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
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122 if (uncomprLen != len) {
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123 fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
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124 exit(1);
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125 }
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126 if (strcmp((char*)uncompr, hello)) {
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127 fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
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128 exit(1);
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129 } else {
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130 printf("gzread(): %s\n", (char *)uncompr);
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131 }
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132
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133 pos = gzseek(file, -8L, SEEK_CUR);
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134 if (pos != 6 || gztell(file) != pos) {
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135 fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
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136 (long)pos, (long)gztell(file));
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137 exit(1);
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138 }
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139
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140 if (gzgetc(file) != ' ') {
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141 fprintf(stderr, "gzgetc error\n");
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142 exit(1);
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143 }
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144
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145 gzgets(file, (char*)uncompr, uncomprLen);
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146 uncomprLen = strlen((char*)uncompr);
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147 if (uncomprLen != 6) { /* "hello!" */
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148 fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err));
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149 exit(1);
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150 }
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151 if (strcmp((char*)uncompr, hello+7)) {
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152 fprintf(stderr, "bad gzgets after gzseek\n");
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153 exit(1);
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154 } else {
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155 printf("gzgets() after gzseek: %s\n", (char *)uncompr);
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156 }
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157
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158 gzclose(file);
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159 }
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160
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161 /* ===========================================================================
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162 * Test deflate() with small buffers
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163 */
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164 void test_deflate(compr, comprLen)
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165 Byte *compr;
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166 uLong comprLen;
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167 {
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168 z_stream c_stream; /* compression stream */
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169 int err;
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170 int len = strlen(hello)+1;
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171
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172 c_stream.zalloc = (alloc_func)0;
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173 c_stream.zfree = (free_func)0;
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174 c_stream.opaque = (voidpf)0;
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175
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176 err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
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177 CHECK_ERR(err, "deflateInit");
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178
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179 c_stream.next_in = (Bytef*)hello;
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180 c_stream.next_out = compr;
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181
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182 while (c_stream.total_in != (uLong)len && c_stream.total_out < comprLen) {
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183 c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
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184 err = deflate(&c_stream, Z_NO_FLUSH);
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185 CHECK_ERR(err, "deflate");
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186 }
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187 /* Finish the stream, still forcing small buffers: */
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188 for (;;) {
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189 c_stream.avail_out = 1;
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190 err = deflate(&c_stream, Z_FINISH);
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191 if (err == Z_STREAM_END) break;
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192 CHECK_ERR(err, "deflate");
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193 }
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194
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195 err = deflateEnd(&c_stream);
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196 CHECK_ERR(err, "deflateEnd");
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197 }
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198
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199 /* ===========================================================================
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200 * Test inflate() with small buffers
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201 */
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202 void test_inflate(compr, comprLen, uncompr, uncomprLen)
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203 Byte *compr, *uncompr;
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204 uLong comprLen, uncomprLen;
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205 {
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206 int err;
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207 z_stream d_stream; /* decompression stream */
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208
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209 strcpy((char*)uncompr, "garbage");
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210
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211 d_stream.zalloc = (alloc_func)0;
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212 d_stream.zfree = (free_func)0;
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213 d_stream.opaque = (voidpf)0;
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214
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215 d_stream.next_in = compr;
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216 d_stream.avail_in = 0;
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217 d_stream.next_out = uncompr;
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218
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219 err = inflateInit(&d_stream);
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220 CHECK_ERR(err, "inflateInit");
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221
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222 while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
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223 d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
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224 err = inflate(&d_stream, Z_NO_FLUSH);
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225 if (err == Z_STREAM_END) break;
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226 CHECK_ERR(err, "inflate");
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227 }
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228
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229 err = inflateEnd(&d_stream);
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230 CHECK_ERR(err, "inflateEnd");
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231
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232 if (strcmp((char*)uncompr, hello)) {
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233 fprintf(stderr, "bad inflate\n");
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234 exit(1);
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235 } else {
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236 printf("inflate(): %s\n", (char *)uncompr);
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237 }
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238 }
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239
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240 /* ===========================================================================
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241 * Test deflate() with large buffers and dynamic change of compression level
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242 */
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243 void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
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244 Byte *compr, *uncompr;
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245 uLong comprLen, uncomprLen;
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246 {
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247 z_stream c_stream; /* compression stream */
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248 int err;
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249
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250 c_stream.zalloc = (alloc_func)0;
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251 c_stream.zfree = (free_func)0;
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252 c_stream.opaque = (voidpf)0;
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253
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254 err = deflateInit(&c_stream, Z_BEST_SPEED);
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255 CHECK_ERR(err, "deflateInit");
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256
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257 c_stream.next_out = compr;
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258 c_stream.avail_out = (uInt)comprLen;
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259
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260 /* At this point, uncompr is still mostly zeroes, so it should compress
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261 * very well:
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262 */
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263 c_stream.next_in = uncompr;
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264 c_stream.avail_in = (uInt)uncomprLen;
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265 err = deflate(&c_stream, Z_NO_FLUSH);
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266 CHECK_ERR(err, "deflate");
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267 if (c_stream.avail_in != 0) {
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268 fprintf(stderr, "deflate not greedy\n");
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269 exit(1);
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270 }
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271
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272 /* Feed in already compressed data and switch to no compression: */
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273 deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
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274 c_stream.next_in = compr;
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275 c_stream.avail_in = (uInt)comprLen/2;
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276 err = deflate(&c_stream, Z_NO_FLUSH);
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277 CHECK_ERR(err, "deflate");
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278
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279 /* Switch back to compressing mode: */
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280 deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
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281 c_stream.next_in = uncompr;
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282 c_stream.avail_in = (uInt)uncomprLen;
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283 err = deflate(&c_stream, Z_NO_FLUSH);
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284 CHECK_ERR(err, "deflate");
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285
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286 err = deflate(&c_stream, Z_FINISH);
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287 if (err != Z_STREAM_END) {
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288 fprintf(stderr, "deflate should report Z_STREAM_END\n");
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289 exit(1);
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290 }
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291 err = deflateEnd(&c_stream);
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292 CHECK_ERR(err, "deflateEnd");
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293 }
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294
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295 /* ===========================================================================
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296 * Test inflate() with large buffers
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297 */
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298 void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
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299 Byte *compr, *uncompr;
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300 uLong comprLen, uncomprLen;
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301 {
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302 int err;
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303 z_stream d_stream; /* decompression stream */
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304
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305 strcpy((char*)uncompr, "garbage");
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306
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307 d_stream.zalloc = (alloc_func)0;
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308 d_stream.zfree = (free_func)0;
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309 d_stream.opaque = (voidpf)0;
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310
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311 d_stream.next_in = compr;
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312 d_stream.avail_in = (uInt)comprLen;
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313
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314 err = inflateInit(&d_stream);
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315 CHECK_ERR(err, "inflateInit");
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316
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317 for (;;) {
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318 d_stream.next_out = uncompr; /* discard the output */
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319 d_stream.avail_out = (uInt)uncomprLen;
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320 err = inflate(&d_stream, Z_NO_FLUSH);
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321 if (err == Z_STREAM_END) break;
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322 CHECK_ERR(err, "large inflate");
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323 }
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324
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325 err = inflateEnd(&d_stream);
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326 CHECK_ERR(err, "inflateEnd");
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327
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328 if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
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329 fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
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330 exit(1);
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331 } else {
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332 printf("large_inflate(): OK\n");
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333 }
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334 }
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335
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336 /* ===========================================================================
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337 * Test deflate() with full flush
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338 */
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339 void test_flush(compr, comprLen)
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340 Byte *compr;
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341 uLong *comprLen;
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342 {
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343 z_stream c_stream; /* compression stream */
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344 int err;
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345 int len = strlen(hello)+1;
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346
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347 c_stream.zalloc = (alloc_func)0;
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348 c_stream.zfree = (free_func)0;
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349 c_stream.opaque = (voidpf)0;
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350
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351 err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
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352 CHECK_ERR(err, "deflateInit");
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353
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354 c_stream.next_in = (Bytef*)hello;
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355 c_stream.next_out = compr;
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356 c_stream.avail_in = 3;
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357 c_stream.avail_out = (uInt)*comprLen;
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358 err = deflate(&c_stream, Z_FULL_FLUSH);
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359 CHECK_ERR(err, "deflate");
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360
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361 compr[3]++; /* force an error in first compressed block */
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362 c_stream.avail_in = len - 3;
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363
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364 err = deflate(&c_stream, Z_FINISH);
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365 if (err != Z_STREAM_END) {
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366 CHECK_ERR(err, "deflate");
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367 }
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368 err = deflateEnd(&c_stream);
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369 CHECK_ERR(err, "deflateEnd");
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370
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371 *comprLen = c_stream.total_out;
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372 }
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373
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374 /* ===========================================================================
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375 * Test inflateSync()
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376 */
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377 void test_sync(compr, comprLen, uncompr, uncomprLen)
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378 Byte *compr, *uncompr;
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379 uLong comprLen, uncomprLen;
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380 {
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381 int err;
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382 z_stream d_stream; /* decompression stream */
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383
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384 strcpy((char*)uncompr, "garbage");
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385
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386 d_stream.zalloc = (alloc_func)0;
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387 d_stream.zfree = (free_func)0;
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388 d_stream.opaque = (voidpf)0;
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389
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390 d_stream.next_in = compr;
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391 d_stream.avail_in = 2; /* just read the zlib header */
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392
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393 err = inflateInit(&d_stream);
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394 CHECK_ERR(err, "inflateInit");
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395
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396 d_stream.next_out = uncompr;
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397 d_stream.avail_out = (uInt)uncomprLen;
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398
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399 inflate(&d_stream, Z_NO_FLUSH);
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400 CHECK_ERR(err, "inflate");
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401
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402 d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */
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403 err = inflateSync(&d_stream); /* but skip the damaged part */
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404 CHECK_ERR(err, "inflateSync");
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405
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406 err = inflate(&d_stream, Z_FINISH);
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407 if (err != Z_DATA_ERROR) {
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408 fprintf(stderr, "inflate should report DATA_ERROR\n");
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409 /* Because of incorrect adler32 */
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410 exit(1);
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411 }
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412 err = inflateEnd(&d_stream);
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413 CHECK_ERR(err, "inflateEnd");
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414
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415 printf("after inflateSync(): hel%s\n", (char *)uncompr);
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416 }
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417
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418 /* ===========================================================================
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419 * Test deflate() with preset dictionary
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420 */
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421 void test_dict_deflate(compr, comprLen)
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422 Byte *compr;
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423 uLong comprLen;
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diff changeset
424 {
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diff changeset
425 z_stream c_stream; /* compression stream */
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diff changeset
426 int err;
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diff changeset
427
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428 c_stream.zalloc = (alloc_func)0;
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diff changeset
429 c_stream.zfree = (free_func)0;
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diff changeset
430 c_stream.opaque = (voidpf)0;
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431
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432 err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
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433 CHECK_ERR(err, "deflateInit");
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diff changeset
434
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435 err = deflateSetDictionary(&c_stream,
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diff changeset
436 (const Bytef*)dictionary, sizeof(dictionary));
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437 CHECK_ERR(err, "deflateSetDictionary");
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diff changeset
438
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439 dictId = c_stream.adler;
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440 c_stream.next_out = compr;
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441 c_stream.avail_out = (uInt)comprLen;
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442
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443 c_stream.next_in = (Bytef*)hello;
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444 c_stream.avail_in = (uInt)strlen(hello)+1;
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445
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446 err = deflate(&c_stream, Z_FINISH);
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447 if (err != Z_STREAM_END) {
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448 fprintf(stderr, "deflate should report Z_STREAM_END\n");
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449 exit(1);
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450 }
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451 err = deflateEnd(&c_stream);
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452 CHECK_ERR(err, "deflateEnd");
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453 }
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diff changeset
454
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jlarmour
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455 /* ===========================================================================
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jlarmour
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456 * Test inflate() with a preset dictionary
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457 */
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458 void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
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459 Byte *compr, *uncompr;
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diff changeset
460 uLong comprLen, uncomprLen;
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461 {
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diff changeset
462 int err;
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463 z_stream d_stream; /* decompression stream */
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diff changeset
464
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465 strcpy((char*)uncompr, "garbage");
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466
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467 d_stream.zalloc = (alloc_func)0;
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468 d_stream.zfree = (free_func)0;
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469 d_stream.opaque = (voidpf)0;
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470
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471 d_stream.next_in = compr;
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472 d_stream.avail_in = (uInt)comprLen;
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473
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474 err = inflateInit(&d_stream);
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475 CHECK_ERR(err, "inflateInit");
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diff changeset
476
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477 d_stream.next_out = uncompr;
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478 d_stream.avail_out = (uInt)uncomprLen;
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479
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480 for (;;) {
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481 err = inflate(&d_stream, Z_NO_FLUSH);
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482 if (err == Z_STREAM_END) break;
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diff changeset
483 if (err == Z_NEED_DICT) {
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diff changeset
484 if (d_stream.adler != dictId) {
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diff changeset
485 fprintf(stderr, "unexpected dictionary");
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diff changeset
486 exit(1);
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487 }
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488 err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
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489 sizeof(dictionary));
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490 }
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491 CHECK_ERR(err, "inflate with dict");
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diff changeset
492 }
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diff changeset
493
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494 err = inflateEnd(&d_stream);
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diff changeset
495 CHECK_ERR(err, "inflateEnd");
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diff changeset
496
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diff changeset
497 if (strcmp((char*)uncompr, hello)) {
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498 fprintf(stderr, "bad inflate with dict\n");
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diff changeset
499 exit(1);
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500 } else {
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501 printf("inflate with dictionary: %s\n", (char *)uncompr);
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502 }
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diff changeset
503 }
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diff changeset
504
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jlarmour
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diff changeset
505 /* ===========================================================================
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diff changeset
506 * Usage: example [output.gz [input.gz]]
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diff changeset
507 */
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diff changeset
508
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509 int main(argc, argv)
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diff changeset
510 int argc;
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511 char *argv[];
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512 {
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513 Byte *compr, *uncompr;
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514 uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
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515 uLong uncomprLen = comprLen;
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diff changeset
516 static const char* myVersion = ZLIB_VERSION;
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diff changeset
517
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diff changeset
518 if (zlibVersion()[0] != myVersion[0]) {
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diff changeset
519 fprintf(stderr, "incompatible zlib version\n");
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diff changeset
520 exit(1);
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diff changeset
521
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522 } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
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523 fprintf(stderr, "warning: different zlib version\n");
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diff changeset
524 }
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diff changeset
525
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526 compr = (Byte*)calloc((uInt)comprLen, 1);
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527 uncompr = (Byte*)calloc((uInt)uncomprLen, 1);
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diff changeset
528 /* compr and uncompr are cleared to avoid reading uninitialized
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jlarmour
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diff changeset
529 * data and to ensure that uncompr compresses well.
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diff changeset
530 */
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531 if (compr == Z_NULL || uncompr == Z_NULL) {
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diff changeset
532 printf("out of memory\n");
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diff changeset
533 exit(1);
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diff changeset
534 }
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diff changeset
535 test_compress(compr, comprLen, uncompr, uncomprLen);
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jlarmour
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diff changeset
536
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jlarmour
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diff changeset
537 test_gzio((argc > 1 ? argv[1] : TESTFILE),
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jlarmour
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diff changeset
538 (argc > 2 ? argv[2] : TESTFILE),
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jlarmour
parents:
diff changeset
539 uncompr, (int)uncomprLen);
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jlarmour
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diff changeset
540
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jlarmour
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diff changeset
541 test_deflate(compr, comprLen);
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diff changeset
542 test_inflate(compr, comprLen, uncompr, uncomprLen);
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jlarmour
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diff changeset
543
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diff changeset
544 test_large_deflate(compr, comprLen, uncompr, uncomprLen);
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diff changeset
545 test_large_inflate(compr, comprLen, uncompr, uncomprLen);
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jlarmour
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diff changeset
546
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jlarmour
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diff changeset
547 test_flush(compr, &comprLen);
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diff changeset
548 test_sync(compr, comprLen, uncompr, uncomprLen);
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diff changeset
549 comprLen = uncomprLen;
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jlarmour
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diff changeset
550
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jlarmour
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diff changeset
551 test_dict_deflate(compr, comprLen);
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jlarmour
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552 test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
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jlarmour
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diff changeset
553
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554 exit(0);
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555 return 0; /* to avoid warning */
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diff changeset
556 }