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1 /* example.c -- usage example of the zlib compression library |
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2 * Copyright (C) 1995-2004 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: example.c,v 1.1.2.2 2007/03/13 06:30:22 gshetty Exp $ */ |
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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 #endif |
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15 |
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16 #if defined(VMS) || defined(RISCOS) |
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17 # define TESTFILE "foo-gz" |
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18 #else |
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19 # define TESTFILE "foo.gz" |
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20 #endif |
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21 |
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22 #define CHECK_ERR(err, msg) { \ |
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23 if (err != Z_OK) { \ |
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24 fprintf(stderr, "%s error: %d\n", msg, err); \ |
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25 exit(1); \ |
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26 } \ |
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27 } |
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28 |
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29 const char hello[] = "hello, hello!"; |
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30 /* "hello world" would be more standard, but the repeated "hello" |
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31 * stresses the compression code better, sorry... |
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32 */ |
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33 |
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34 const char dictionary[] = "hello"; |
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35 uLong dictId; /* Adler32 value of the dictionary */ |
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36 |
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37 void test_compress OF((Byte *compr, uLong comprLen, |
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38 Byte *uncompr, uLong uncomprLen)); |
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39 void test_gzio OF((const char *fname, |
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40 Byte *uncompr, uLong uncomprLen)); |
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41 void test_deflate OF((Byte *compr, uLong comprLen)); |
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42 void test_inflate OF((Byte *compr, uLong comprLen, |
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43 Byte *uncompr, uLong uncomprLen)); |
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44 void test_large_deflate OF((Byte *compr, uLong comprLen, |
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45 Byte *uncompr, uLong uncomprLen)); |
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46 void test_large_inflate OF((Byte *compr, uLong comprLen, |
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47 Byte *uncompr, uLong uncomprLen)); |
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48 void test_flush OF((Byte *compr, uLong *comprLen)); |
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49 void test_sync OF((Byte *compr, uLong comprLen, |
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50 Byte *uncompr, uLong uncomprLen)); |
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51 void test_dict_deflate OF((Byte *compr, uLong comprLen)); |
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52 void test_dict_inflate OF((Byte *compr, uLong comprLen, |
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53 Byte *uncompr, uLong uncomprLen)); |
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54 int main OF((int argc, char *argv[])); |
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55 |
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56 /* =========================================================================== |
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57 * Test compress() and uncompress() |
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58 */ |
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59 #ifdef __SYMBIAN32__ |
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60 void test_compress(Byte * compr,uLong comprLen,Byte * uncompr,uLong uncomprLen) |
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61 #else |
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62 void test_compress(compr, comprLen, uncompr, uncomprLen) |
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63 Byte *compr, *uncompr; |
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64 uLong comprLen, uncomprLen; |
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65 #endif //__SYMBIAN32__ |
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66 { |
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67 int err; |
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68 uLong len = (uLong)strlen(hello)+1; |
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69 |
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70 err = compress(compr, &comprLen, (const Bytef*)hello, len); |
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71 CHECK_ERR(err, "compress"); |
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72 |
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73 strcpy((char*)uncompr, "garbage"); |
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74 |
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75 err = uncompress(uncompr, &uncomprLen, compr, comprLen); |
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76 CHECK_ERR(err, "uncompress"); |
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77 |
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78 if (strcmp((char*)uncompr, hello)) { |
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79 fprintf(stderr, "bad uncompress\n"); |
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80 exit(1); |
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81 } else { |
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82 printf("uncompress(): %s\n", (char *)uncompr); |
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83 } |
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84 } |
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85 |
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86 /* =========================================================================== |
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87 * Test read/write of .gz files |
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88 */ |
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89 #ifdef __SYMBIAN32__ |
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90 void test_gzio( const char *fname, Byte * uncompr, uLong uncomprLen) |
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91 #else |
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92 void test_gzio(fname, uncompr, uncomprLen) |
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93 const char *fname; /* compressed file name */ |
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94 Byte *uncompr; |
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95 uLong uncomprLen; |
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96 #endif //__SYMBIAN32__ |
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97 { |
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98 #ifdef NO_GZCOMPRESS |
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99 fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n"); |
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100 #else |
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101 int err; |
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102 int len = (int)strlen(hello)+1; |
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103 gzFile file; |
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104 z_off_t pos; |
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105 |
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106 file = gzopen(fname, "wb"); |
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107 if (file == NULL) { |
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108 fprintf(stderr, "gzopen error\n"); |
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109 exit(1); |
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110 } |
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111 gzputc(file, 'h'); |
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112 if (gzputs(file, "ello") != 4) { |
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113 fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err)); |
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114 exit(1); |
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115 } |
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116 if (gzprintf(file, ", %s!", "hello") != 8) { |
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117 fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err)); |
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118 exit(1); |
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119 } |
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120 gzseek(file, 1L, SEEK_CUR); /* add one zero byte */ |
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121 gzclose(file); |
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122 |
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123 file = gzopen(fname, "rb"); |
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124 if (file == NULL) { |
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125 fprintf(stderr, "gzopen error\n"); |
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126 exit(1); |
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127 } |
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128 strcpy((char*)uncompr, "garbage"); |
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129 |
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130 if (gzread(file, uncompr, (unsigned)uncomprLen) != len) { |
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131 fprintf(stderr, "gzread err: %s\n", gzerror(file, &err)); |
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132 exit(1); |
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133 } |
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134 if (strcmp((char*)uncompr, hello)) { |
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135 fprintf(stderr, "bad gzread: %s\n", (char*)uncompr); |
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136 exit(1); |
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137 } else { |
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138 printf("gzread(): %s\n", (char*)uncompr); |
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139 } |
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140 |
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141 pos = gzseek(file, -8L, SEEK_CUR); |
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142 if (pos != 6 || gztell(file) != pos) { |
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143 fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n", |
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144 (long)pos, (long)gztell(file)); |
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145 exit(1); |
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146 } |
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147 |
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148 if (gzgetc(file) != ' ') { |
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149 fprintf(stderr, "gzgetc error\n"); |
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150 exit(1); |
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151 } |
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152 |
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153 if (gzungetc(' ', file) != ' ') { |
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154 fprintf(stderr, "gzungetc error\n"); |
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155 exit(1); |
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156 } |
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157 |
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158 gzgets(file, (char*)uncompr, (int)uncomprLen); |
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159 if (strlen((char*)uncompr) != 7) { /* " hello!" */ |
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160 fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err)); |
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161 exit(1); |
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162 } |
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163 if (strcmp((char*)uncompr, hello + 6)) { |
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164 fprintf(stderr, "bad gzgets after gzseek\n"); |
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165 exit(1); |
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166 } else { |
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167 printf("gzgets() after gzseek: %s\n", (char*)uncompr); |
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168 } |
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169 |
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170 gzclose(file); |
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171 #endif |
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172 } |
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173 |
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174 /* =========================================================================== |
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175 * Test deflate() with small buffers |
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176 */ |
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177 #ifdef __SYMBIAN32__ |
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178 void test_deflate( Byte * compr, uLong comprLen) |
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179 #else |
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180 void test_deflate(compr, comprLen) |
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181 Byte *compr; |
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182 uLong comprLen; |
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183 #endif //__SYMBIAN32__ |
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184 { |
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185 z_stream c_stream; /* compression stream */ |
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186 int err; |
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187 uLong len = (uLong)strlen(hello)+1; |
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188 |
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189 c_stream.zalloc = (alloc_func)0; |
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190 c_stream.zfree = (free_func)0; |
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191 c_stream.opaque = (voidpf)0; |
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192 |
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193 err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION); |
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194 CHECK_ERR(err, "deflateInit"); |
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195 |
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196 c_stream.next_in = (Bytef*)hello; |
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197 c_stream.next_out = compr; |
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198 |
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199 while (c_stream.total_in != len && c_stream.total_out < comprLen) { |
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200 c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */ |
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201 err = deflate(&c_stream, Z_NO_FLUSH); |
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202 CHECK_ERR(err, "deflate"); |
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203 } |
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204 /* Finish the stream, still forcing small buffers: */ |
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205 for (;;) { |
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206 c_stream.avail_out = 1; |
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207 err = deflate(&c_stream, Z_FINISH); |
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208 if (err == Z_STREAM_END) break; |
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209 CHECK_ERR(err, "deflate"); |
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210 } |
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211 |
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212 err = deflateEnd(&c_stream); |
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213 CHECK_ERR(err, "deflateEnd"); |
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214 } |
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215 |
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216 /* =========================================================================== |
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217 * Test inflate() with small buffers |
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218 */ |
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219 #ifdef __SYMBIAN32__ |
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220 void test_inflate( Byte * compr,uLong comprLen, Byte * uncompr,uLong uncomprLen) |
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221 #else |
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222 void test_inflate(compr, comprLen, uncompr, uncomprLen) |
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223 Byte *compr, *uncompr; |
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224 uLong comprLen, uncomprLen; |
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225 #endif //__SYMBIAN32__ |
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226 { |
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227 int err; |
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228 z_stream d_stream; /* decompression stream */ |
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229 |
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230 strcpy((char*)uncompr, "garbage"); |
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231 |
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232 d_stream.zalloc = (alloc_func)0; |
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233 d_stream.zfree = (free_func)0; |
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234 d_stream.opaque = (voidpf)0; |
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235 |
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236 d_stream.next_in = compr; |
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237 d_stream.avail_in = 0; |
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238 d_stream.next_out = uncompr; |
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239 |
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240 err = inflateInit(&d_stream); |
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241 CHECK_ERR(err, "inflateInit"); |
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242 |
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243 while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) { |
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244 d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */ |
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245 err = inflate(&d_stream, Z_NO_FLUSH); |
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246 if (err == Z_STREAM_END) break; |
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247 CHECK_ERR(err, "inflate"); |
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248 } |
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249 |
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250 err = inflateEnd(&d_stream); |
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251 CHECK_ERR(err, "inflateEnd"); |
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252 |
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253 if (strcmp((char*)uncompr, hello)) { |
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254 fprintf(stderr, "bad inflate\n"); |
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255 exit(1); |
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256 } else { |
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257 printf("inflate(): %s\n", (char *)uncompr); |
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258 } |
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259 } |
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260 |
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261 /* =========================================================================== |
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262 * Test deflate() with large buffers and dynamic change of compression level |
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263 */ |
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264 #ifdef __SYMBIAN32__ |
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265 void test_large_deflate( Byte * compr,uLong comprLen, Byte * uncompr, uLong uncomprLen) |
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266 #else |
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267 void test_large_deflate(compr, comprLen, uncompr, uncomprLen) |
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268 Byte *compr, *uncompr; |
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269 uLong comprLen, uncomprLen; |
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270 #endif //__SYMBIAN32__ |
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271 { |
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272 z_stream c_stream; /* compression stream */ |
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273 int err; |
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274 |
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275 c_stream.zalloc = (alloc_func)0; |
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276 c_stream.zfree = (free_func)0; |
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277 c_stream.opaque = (voidpf)0; |
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278 |
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279 err = deflateInit(&c_stream, Z_BEST_SPEED); |
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280 CHECK_ERR(err, "deflateInit"); |
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281 |
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282 c_stream.next_out = compr; |
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283 c_stream.avail_out = (uInt)comprLen; |
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284 |
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285 /* At this point, uncompr is still mostly zeroes, so it should compress |
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286 * very well: |
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287 */ |
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288 c_stream.next_in = uncompr; |
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289 c_stream.avail_in = (uInt)uncomprLen; |
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290 err = deflate(&c_stream, Z_NO_FLUSH); |
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291 CHECK_ERR(err, "deflate"); |
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292 if (c_stream.avail_in != 0) { |
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293 fprintf(stderr, "deflate not greedy\n"); |
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294 exit(1); |
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295 } |
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296 |
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297 /* Feed in already compressed data and switch to no compression: */ |
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298 deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY); |
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299 c_stream.next_in = compr; |
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300 c_stream.avail_in = (uInt)comprLen/2; |
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301 err = deflate(&c_stream, Z_NO_FLUSH); |
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302 CHECK_ERR(err, "deflate"); |
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303 |
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304 /* Switch back to compressing mode: */ |
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305 deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED); |
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306 c_stream.next_in = uncompr; |
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307 c_stream.avail_in = (uInt)uncomprLen; |
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308 err = deflate(&c_stream, Z_NO_FLUSH); |
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309 CHECK_ERR(err, "deflate"); |
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310 |
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311 err = deflate(&c_stream, Z_FINISH); |
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312 if (err != Z_STREAM_END) { |
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313 fprintf(stderr, "deflate should report Z_STREAM_END\n"); |
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314 exit(1); |
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315 } |
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316 err = deflateEnd(&c_stream); |
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317 CHECK_ERR(err, "deflateEnd"); |
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318 } |
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319 |
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320 /* =========================================================================== |
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321 * Test inflate() with large buffers |
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322 */ |
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323 #ifdef __SYMBIAN32__ |
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324 void test_large_inflate( Byte * compr,uLong comprLen, Byte * uncompr,uLong uncomprLen) |
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325 |
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326 #else |
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327 void test_large_inflate(compr, comprLen, uncompr, uncomprLen) |
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328 Byte *compr, *uncompr; |
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329 uLong comprLen, uncomprLen; |
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330 #endif //__SYMBIAN32__ |
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331 { |
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332 int err; |
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333 z_stream d_stream; /* decompression stream */ |
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334 |
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335 strcpy((char*)uncompr, "garbage"); |
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336 |
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337 d_stream.zalloc = (alloc_func)0; |
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338 d_stream.zfree = (free_func)0; |
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339 d_stream.opaque = (voidpf)0; |
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340 |
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341 d_stream.next_in = compr; |
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342 d_stream.avail_in = (uInt)comprLen; |
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343 |
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344 err = inflateInit(&d_stream); |
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345 CHECK_ERR(err, "inflateInit"); |
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346 |
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347 for (;;) { |
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348 d_stream.next_out = uncompr; /* discard the output */ |
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349 d_stream.avail_out = (uInt)uncomprLen; |
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350 err = inflate(&d_stream, Z_NO_FLUSH); |
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351 if (err == Z_STREAM_END) break; |
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352 CHECK_ERR(err, "large inflate"); |
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353 } |
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354 |
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355 err = inflateEnd(&d_stream); |
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356 CHECK_ERR(err, "inflateEnd"); |
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357 |
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358 if (d_stream.total_out != 2*uncomprLen + comprLen/2) { |
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359 fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out); |
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360 exit(1); |
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361 } else { |
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362 printf("large_inflate(): OK\n"); |
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363 } |
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364 } |
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365 |
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366 /* =========================================================================== |
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367 * Test deflate() with full flush |
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368 */ |
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369 void test_flush(compr, comprLen) |
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370 Byte *compr; |
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371 uLong *comprLen; |
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372 { |
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373 z_stream c_stream; /* compression stream */ |
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374 int err; |
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375 uInt len = (uInt)strlen(hello)+1; |
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376 |
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377 c_stream.zalloc = (alloc_func)0; |
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378 c_stream.zfree = (free_func)0; |
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379 c_stream.opaque = (voidpf)0; |
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380 |
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381 err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION); |
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382 CHECK_ERR(err, "deflateInit"); |
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383 |
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384 c_stream.next_in = (Bytef*)hello; |
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385 c_stream.next_out = compr; |
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386 c_stream.avail_in = 3; |
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387 c_stream.avail_out = (uInt)*comprLen; |
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388 err = deflate(&c_stream, Z_FULL_FLUSH); |
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389 CHECK_ERR(err, "deflate"); |
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390 |
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391 compr[3]++; /* force an error in first compressed block */ |
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392 c_stream.avail_in = len - 3; |
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393 |
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394 err = deflate(&c_stream, Z_FINISH); |
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395 if (err != Z_STREAM_END) { |
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396 CHECK_ERR(err, "deflate"); |
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397 } |
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398 err = deflateEnd(&c_stream); |
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399 CHECK_ERR(err, "deflateEnd"); |
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400 |
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401 *comprLen = c_stream.total_out; |
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402 } |
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403 |
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404 /* =========================================================================== |
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405 * Test inflateSync() |
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406 */ |
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407 void test_sync(compr, comprLen, uncompr, uncomprLen) |
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408 Byte *compr, *uncompr; |
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409 uLong comprLen, uncomprLen; |
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410 { |
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411 int err; |
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412 z_stream d_stream; /* decompression stream */ |
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413 |
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414 strcpy((char*)uncompr, "garbage"); |
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415 |
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416 d_stream.zalloc = (alloc_func)0; |
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417 d_stream.zfree = (free_func)0; |
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418 d_stream.opaque = (voidpf)0; |
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419 |
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420 d_stream.next_in = compr; |
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421 d_stream.avail_in = 2; /* just read the zlib header */ |
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422 |
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423 err = inflateInit(&d_stream); |
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424 CHECK_ERR(err, "inflateInit"); |
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425 |
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426 d_stream.next_out = uncompr; |
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427 d_stream.avail_out = (uInt)uncomprLen; |
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428 |
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429 inflate(&d_stream, Z_NO_FLUSH); |
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430 CHECK_ERR(err, "inflate"); |
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431 |
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432 d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */ |
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433 err = inflateSync(&d_stream); /* but skip the damaged part */ |
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434 CHECK_ERR(err, "inflateSync"); |
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435 |
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436 err = inflate(&d_stream, Z_FINISH); |
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437 if (err != Z_DATA_ERROR) { |
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438 fprintf(stderr, "inflate should report DATA_ERROR\n"); |
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439 /* Because of incorrect adler32 */ |
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440 exit(1); |
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441 } |
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442 err = inflateEnd(&d_stream); |
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443 CHECK_ERR(err, "inflateEnd"); |
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444 |
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445 printf("after inflateSync(): hel%s\n", (char *)uncompr); |
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446 } |
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447 |
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448 /* =========================================================================== |
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449 * Test deflate() with preset dictionary |
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450 */ |
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451 void test_dict_deflate(compr, comprLen) |
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452 Byte *compr; |
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453 uLong comprLen; |
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454 { |
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455 z_stream c_stream; /* compression stream */ |
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456 int err; |
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457 |
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458 c_stream.zalloc = (alloc_func)0; |
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459 c_stream.zfree = (free_func)0; |
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460 c_stream.opaque = (voidpf)0; |
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461 |
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462 err = deflateInit(&c_stream, Z_BEST_COMPRESSION); |
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463 CHECK_ERR(err, "deflateInit"); |
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464 |
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465 err = deflateSetDictionary(&c_stream, |
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466 (const Bytef*)dictionary, sizeof(dictionary)); |
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467 CHECK_ERR(err, "deflateSetDictionary"); |
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468 |
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469 dictId = c_stream.adler; |
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470 c_stream.next_out = compr; |
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471 c_stream.avail_out = (uInt)comprLen; |
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472 |
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473 c_stream.next_in = (Bytef*)hello; |
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474 c_stream.avail_in = (uInt)strlen(hello)+1; |
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475 |
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476 err = deflate(&c_stream, Z_FINISH); |
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477 if (err != Z_STREAM_END) { |
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478 fprintf(stderr, "deflate should report Z_STREAM_END\n"); |
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479 exit(1); |
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480 } |
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481 err = deflateEnd(&c_stream); |
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482 CHECK_ERR(err, "deflateEnd"); |
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483 } |
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484 |
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485 /* =========================================================================== |
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486 * Test inflate() with a preset dictionary |
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487 */ |
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488 void test_dict_inflate(compr, comprLen, uncompr, uncomprLen) |
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489 Byte *compr, *uncompr; |
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490 uLong comprLen, uncomprLen; |
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491 { |
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492 int err; |
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493 z_stream d_stream; /* decompression stream */ |
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494 |
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495 strcpy((char*)uncompr, "garbage"); |
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496 |
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497 d_stream.zalloc = (alloc_func)0; |
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498 d_stream.zfree = (free_func)0; |
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499 d_stream.opaque = (voidpf)0; |
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500 |
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501 d_stream.next_in = compr; |
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502 d_stream.avail_in = (uInt)comprLen; |
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503 |
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504 err = inflateInit(&d_stream); |
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505 CHECK_ERR(err, "inflateInit"); |
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506 |
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507 d_stream.next_out = uncompr; |
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508 d_stream.avail_out = (uInt)uncomprLen; |
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509 |
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510 for (;;) { |
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511 err = inflate(&d_stream, Z_NO_FLUSH); |
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512 if (err == Z_STREAM_END) break; |
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513 if (err == Z_NEED_DICT) { |
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514 if (d_stream.adler != dictId) { |
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515 fprintf(stderr, "unexpected dictionary"); |
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516 exit(1); |
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517 } |
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518 err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary, |
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519 sizeof(dictionary)); |
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520 } |
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521 CHECK_ERR(err, "inflate with dict"); |
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522 } |
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523 |
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524 err = inflateEnd(&d_stream); |
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525 CHECK_ERR(err, "inflateEnd"); |
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526 |
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527 if (strcmp((char*)uncompr, hello)) { |
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528 fprintf(stderr, "bad inflate with dict\n"); |
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529 exit(1); |
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530 } else { |
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531 printf("inflate with dictionary: %s\n", (char *)uncompr); |
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532 } |
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533 } |
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534 |
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535 /* =========================================================================== |
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536 * Usage: example [output.gz [input.gz]] |
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537 */ |
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538 |
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539 int main(argc, argv) |
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540 int argc; |
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541 char *argv[]; |
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542 { |
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543 Byte *compr, *uncompr; |
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544 uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */ |
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545 uLong uncomprLen = comprLen; |
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546 static const char* myVersion = ZLIB_VERSION; |
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547 |
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548 if (zlibVersion()[0] != myVersion[0]) { |
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549 fprintf(stderr, "incompatible zlib version\n"); |
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550 exit(1); |
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551 |
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552 } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) { |
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553 fprintf(stderr, "warning: different zlib version\n"); |
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554 } |
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555 |
|
556 printf("zlib version %s = 0x%04x, compile flags = 0x%lx\n", |
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557 ZLIB_VERSION, ZLIB_VERNUM, zlibCompileFlags()); |
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558 |
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559 compr = (Byte*)calloc((uInt)comprLen, 1); |
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560 uncompr = (Byte*)calloc((uInt)uncomprLen, 1); |
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561 /* compr and uncompr are cleared to avoid reading uninitialized |
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562 * data and to ensure that uncompr compresses well. |
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563 */ |
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564 if (compr == Z_NULL || uncompr == Z_NULL) { |
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565 printf("out of memory\n"); |
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566 exit(1); |
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567 } |
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568 test_compress(compr, comprLen, uncompr, uncomprLen); |
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569 |
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570 test_gzio((argc > 1 ? argv[1] : TESTFILE), |
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571 uncompr, uncomprLen); |
|
572 |
|
573 test_deflate(compr, comprLen); |
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574 test_inflate(compr, comprLen, uncompr, uncomprLen); |
|
575 |
|
576 test_large_deflate(compr, comprLen, uncompr, uncomprLen); |
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577 test_large_inflate(compr, comprLen, uncompr, uncomprLen); |
|
578 |
|
579 test_flush(compr, &comprLen); |
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580 test_sync(compr, comprLen, uncompr, uncomprLen); |
|
581 comprLen = uncomprLen; |
|
582 |
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583 test_dict_deflate(compr, comprLen); |
|
584 test_dict_inflate(compr, comprLen, uncompr, uncomprLen); |
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585 |
|
586 free(compr); |
|
587 free(uncompr); |
|
588 |
|
589 return 0; |
|
590 } |