1 | /* |
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2 | * |
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3 | * Copyright (c) 1997 |
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4 | * Christian Michelsen Research AS |
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5 | * Advanced Computing |
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6 | * Fantoftvegen 38, 5036 BERGEN, Norway |
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7 | * http://www.cmr.no |
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8 | * |
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9 | * Permission to use, copy, modify, distribute and sell this software |
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10 | * and its documentation for any purpose is hereby granted without fee, |
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11 | * provided that the above copyright notice appear in all copies and |
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12 | * that both that copyright notice and this permission notice appear |
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13 | * in supporting documentation. Christian Michelsen Research AS makes no |
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14 | * representations about the suitability of this software for any |
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15 | * purpose. It is provided "as is" without express or implied warranty. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef ZSTREAM__H |
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20 | #define ZSTREAM__H |
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21 | |
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22 | /* |
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23 | * zstream.h - C++ interface to the 'zlib' general purpose compression library |
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24 | * $Id: zstream.h,v 1.1.1.1 2002-01-31 15:37:49 ghudson Exp $ |
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25 | */ |
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26 | |
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27 | #include <strstream.h> |
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28 | #include <string.h> |
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29 | #include <stdio.h> |
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30 | #include "zlib.h" |
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31 | |
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32 | #if defined(_WIN32) |
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33 | # include <fcntl.h> |
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34 | # include <io.h> |
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35 | # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) |
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36 | #else |
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37 | # define SET_BINARY_MODE(file) |
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38 | #endif |
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39 | |
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40 | class zstringlen { |
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41 | public: |
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42 | zstringlen(class izstream&); |
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43 | zstringlen(class ozstream&, const char*); |
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44 | size_t value() const { return val.word; } |
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45 | private: |
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46 | struct Val { unsigned char byte; size_t word; } val; |
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47 | }; |
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48 | |
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49 | // ----------------------------- izstream ----------------------------- |
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50 | |
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51 | class izstream |
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52 | { |
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53 | public: |
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54 | izstream() : m_fp(0) {} |
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55 | izstream(FILE* fp) : m_fp(0) { open(fp); } |
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56 | izstream(const char* name) : m_fp(0) { open(name); } |
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57 | ~izstream() { close(); } |
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58 | |
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59 | /* Opens a gzip (.gz) file for reading. |
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60 | * open() can be used to read a file which is not in gzip format; |
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61 | * in this case read() will directly read from the file without |
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62 | * decompression. errno can be checked to distinguish two error |
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63 | * cases (if errno is zero, the zlib error is Z_MEM_ERROR). |
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64 | */ |
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65 | void open(const char* name) { |
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66 | if (m_fp) close(); |
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67 | m_fp = ::gzopen(name, "rb"); |
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68 | } |
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69 | |
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70 | void open(FILE* fp) { |
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71 | SET_BINARY_MODE(fp); |
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72 | if (m_fp) close(); |
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73 | m_fp = ::gzdopen(fileno(fp), "rb"); |
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74 | } |
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75 | |
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76 | /* Flushes all pending input if necessary, closes the compressed file |
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77 | * and deallocates all the (de)compression state. The return value is |
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78 | * the zlib error number (see function error() below). |
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79 | */ |
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80 | int close() { |
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81 | int r = ::gzclose(m_fp); |
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82 | m_fp = 0; return r; |
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83 | } |
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84 | |
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85 | /* Binary read the given number of bytes from the compressed file. |
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86 | */ |
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87 | int read(void* buf, size_t len) { |
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88 | return ::gzread(m_fp, buf, len); |
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89 | } |
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90 | |
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91 | /* Returns the error message for the last error which occurred on the |
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92 | * given compressed file. errnum is set to zlib error number. If an |
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93 | * error occurred in the file system and not in the compression library, |
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94 | * errnum is set to Z_ERRNO and the application may consult errno |
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95 | * to get the exact error code. |
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96 | */ |
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97 | const char* error(int* errnum) { |
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98 | return ::gzerror(m_fp, errnum); |
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99 | } |
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100 | |
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101 | gzFile fp() { return m_fp; } |
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102 | |
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103 | private: |
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104 | gzFile m_fp; |
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105 | }; |
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106 | |
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107 | /* |
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108 | * Binary read the given (array of) object(s) from the compressed file. |
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109 | * If the input file was not in gzip format, read() copies the objects number |
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110 | * of bytes into the buffer. |
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111 | * returns the number of uncompressed bytes actually read |
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112 | * (0 for end of file, -1 for error). |
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113 | */ |
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114 | template <class T, class Items> |
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115 | inline int read(izstream& zs, T* x, Items items) { |
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116 | return ::gzread(zs.fp(), x, items*sizeof(T)); |
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117 | } |
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118 | |
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119 | /* |
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120 | * Binary input with the '>' operator. |
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121 | */ |
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122 | template <class T> |
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123 | inline izstream& operator>(izstream& zs, T& x) { |
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124 | ::gzread(zs.fp(), &x, sizeof(T)); |
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125 | return zs; |
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126 | } |
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127 | |
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128 | |
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129 | inline zstringlen::zstringlen(izstream& zs) { |
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130 | zs > val.byte; |
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131 | if (val.byte == 255) zs > val.word; |
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132 | else val.word = val.byte; |
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133 | } |
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134 | |
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135 | /* |
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136 | * Read length of string + the string with the '>' operator. |
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137 | */ |
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138 | inline izstream& operator>(izstream& zs, char* x) { |
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139 | zstringlen len(zs); |
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140 | ::gzread(zs.fp(), x, len.value()); |
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141 | x[len.value()] = '\0'; |
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142 | return zs; |
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143 | } |
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144 | |
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145 | inline char* read_string(izstream& zs) { |
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146 | zstringlen len(zs); |
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147 | char* x = new char[len.value()+1]; |
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148 | ::gzread(zs.fp(), x, len.value()); |
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149 | x[len.value()] = '\0'; |
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150 | return x; |
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151 | } |
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152 | |
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153 | // ----------------------------- ozstream ----------------------------- |
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154 | |
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155 | class ozstream |
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156 | { |
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157 | public: |
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158 | ozstream() : m_fp(0), m_os(0) { |
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159 | } |
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160 | ozstream(FILE* fp, int level = Z_DEFAULT_COMPRESSION) |
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161 | : m_fp(0), m_os(0) { |
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162 | open(fp, level); |
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163 | } |
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164 | ozstream(const char* name, int level = Z_DEFAULT_COMPRESSION) |
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165 | : m_fp(0), m_os(0) { |
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166 | open(name, level); |
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167 | } |
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168 | ~ozstream() { |
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169 | close(); |
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170 | } |
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171 | |
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172 | /* Opens a gzip (.gz) file for writing. |
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173 | * The compression level parameter should be in 0..9 |
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174 | * errno can be checked to distinguish two error cases |
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175 | * (if errno is zero, the zlib error is Z_MEM_ERROR). |
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176 | */ |
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177 | void open(const char* name, int level = Z_DEFAULT_COMPRESSION) { |
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178 | char mode[4] = "wb\0"; |
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179 | if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level; |
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180 | if (m_fp) close(); |
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181 | m_fp = ::gzopen(name, mode); |
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182 | } |
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183 | |
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184 | /* open from a FILE pointer. |
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185 | */ |
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186 | void open(FILE* fp, int level = Z_DEFAULT_COMPRESSION) { |
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187 | SET_BINARY_MODE(fp); |
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188 | char mode[4] = "wb\0"; |
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189 | if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level; |
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190 | if (m_fp) close(); |
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191 | m_fp = ::gzdopen(fileno(fp), mode); |
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192 | } |
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193 | |
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194 | /* Flushes all pending output if necessary, closes the compressed file |
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195 | * and deallocates all the (de)compression state. The return value is |
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196 | * the zlib error number (see function error() below). |
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197 | */ |
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198 | int close() { |
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199 | if (m_os) { |
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200 | ::gzwrite(m_fp, m_os->str(), m_os->pcount()); |
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201 | delete[] m_os->str(); delete m_os; m_os = 0; |
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202 | } |
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203 | int r = ::gzclose(m_fp); m_fp = 0; return r; |
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204 | } |
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205 | |
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206 | /* Binary write the given number of bytes into the compressed file. |
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207 | */ |
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208 | int write(const void* buf, size_t len) { |
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209 | return ::gzwrite(m_fp, (voidp) buf, len); |
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210 | } |
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211 | |
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212 | /* Flushes all pending output into the compressed file. The parameter |
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213 | * _flush is as in the deflate() function. The return value is the zlib |
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214 | * error number (see function gzerror below). flush() returns Z_OK if |
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215 | * the flush_ parameter is Z_FINISH and all output could be flushed. |
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216 | * flush() should be called only when strictly necessary because it can |
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217 | * degrade compression. |
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218 | */ |
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219 | int flush(int _flush) { |
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220 | os_flush(); |
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221 | return ::gzflush(m_fp, _flush); |
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222 | } |
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223 | |
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224 | /* Returns the error message for the last error which occurred on the |
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225 | * given compressed file. errnum is set to zlib error number. If an |
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226 | * error occurred in the file system and not in the compression library, |
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227 | * errnum is set to Z_ERRNO and the application may consult errno |
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228 | * to get the exact error code. |
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229 | */ |
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230 | const char* error(int* errnum) { |
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231 | return ::gzerror(m_fp, errnum); |
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232 | } |
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233 | |
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234 | gzFile fp() { return m_fp; } |
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235 | |
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236 | ostream& os() { |
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237 | if (m_os == 0) m_os = new ostrstream; |
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238 | return *m_os; |
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239 | } |
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240 | |
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241 | void os_flush() { |
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242 | if (m_os && m_os->pcount()>0) { |
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243 | ostrstream* oss = new ostrstream; |
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244 | oss->fill(m_os->fill()); |
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245 | oss->flags(m_os->flags()); |
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246 | oss->precision(m_os->precision()); |
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247 | oss->width(m_os->width()); |
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248 | ::gzwrite(m_fp, m_os->str(), m_os->pcount()); |
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249 | delete[] m_os->str(); delete m_os; m_os = oss; |
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250 | } |
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251 | } |
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252 | |
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253 | private: |
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254 | gzFile m_fp; |
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255 | ostrstream* m_os; |
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256 | }; |
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257 | |
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258 | /* |
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259 | * Binary write the given (array of) object(s) into the compressed file. |
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260 | * returns the number of uncompressed bytes actually written |
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261 | * (0 in case of error). |
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262 | */ |
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263 | template <class T, class Items> |
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264 | inline int write(ozstream& zs, const T* x, Items items) { |
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265 | return ::gzwrite(zs.fp(), (voidp) x, items*sizeof(T)); |
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266 | } |
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267 | |
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268 | /* |
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269 | * Binary output with the '<' operator. |
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270 | */ |
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271 | template <class T> |
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272 | inline ozstream& operator<(ozstream& zs, const T& x) { |
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273 | ::gzwrite(zs.fp(), (voidp) &x, sizeof(T)); |
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274 | return zs; |
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275 | } |
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276 | |
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277 | inline zstringlen::zstringlen(ozstream& zs, const char* x) { |
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278 | val.byte = 255; val.word = ::strlen(x); |
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279 | if (val.word < 255) zs < (val.byte = val.word); |
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280 | else zs < val; |
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281 | } |
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282 | |
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283 | /* |
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284 | * Write length of string + the string with the '<' operator. |
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285 | */ |
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286 | inline ozstream& operator<(ozstream& zs, const char* x) { |
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287 | zstringlen len(zs, x); |
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288 | ::gzwrite(zs.fp(), (voidp) x, len.value()); |
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289 | return zs; |
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290 | } |
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291 | |
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292 | #ifdef _MSC_VER |
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293 | inline ozstream& operator<(ozstream& zs, char* const& x) { |
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294 | return zs < (const char*) x; |
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295 | } |
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296 | #endif |
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297 | |
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298 | /* |
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299 | * Ascii write with the << operator; |
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300 | */ |
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301 | template <class T> |
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302 | inline ostream& operator<<(ozstream& zs, const T& x) { |
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303 | zs.os_flush(); |
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304 | return zs.os() << x; |
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305 | } |
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306 | |
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307 | #endif |
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