1 | /* gzwrite.c -- zlib functions for writing gzip files |
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2 | * Copyright (C) 2004, 2005, 2010 Mark Adler |
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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 | #include "gzguts.h" |
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7 | |
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8 | /* Local functions */ |
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9 | local int gz_init OF((gz_statep)); |
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10 | local int gz_comp OF((gz_statep, int)); |
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11 | local int gz_zero OF((gz_statep, z_off64_t)); |
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12 | |
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13 | /* Initialize state for writing a gzip file. Mark initialization by setting |
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14 | state->size to non-zero. Return -1 on failure or 0 on success. */ |
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15 | local int gz_init(state) |
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16 | gz_statep state; |
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17 | { |
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18 | int ret; |
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19 | z_streamp strm = &(state->strm); |
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20 | |
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21 | /* allocate input and output buffers */ |
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22 | state->in = malloc(state->want); |
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23 | state->out = malloc(state->want); |
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24 | if (state->in == NULL || state->out == NULL) { |
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25 | if (state->out != NULL) |
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26 | free(state->out); |
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27 | if (state->in != NULL) |
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28 | free(state->in); |
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29 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
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30 | return -1; |
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31 | } |
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32 | |
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33 | /* allocate deflate memory, set up for gzip compression */ |
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34 | strm->zalloc = Z_NULL; |
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35 | strm->zfree = Z_NULL; |
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36 | strm->opaque = Z_NULL; |
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37 | ret = deflateInit2(strm, state->level, Z_DEFLATED, |
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38 | 15 + 16, 8, state->strategy); |
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39 | if (ret != Z_OK) { |
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40 | free(state->in); |
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41 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
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42 | return -1; |
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43 | } |
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44 | |
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45 | /* mark state as initialized */ |
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46 | state->size = state->want; |
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47 | |
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48 | /* initialize write buffer */ |
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49 | strm->avail_out = state->size; |
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50 | strm->next_out = state->out; |
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51 | state->next = strm->next_out; |
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52 | return 0; |
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53 | } |
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54 | |
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55 | /* Compress whatever is at avail_in and next_in and write to the output file. |
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56 | Return -1 if there is an error writing to the output file, otherwise 0. |
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57 | flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH, |
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58 | then the deflate() state is reset to start a new gzip stream. */ |
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59 | local int gz_comp(state, flush) |
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60 | gz_statep state; |
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61 | int flush; |
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62 | { |
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63 | int ret, got; |
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64 | unsigned have; |
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65 | z_streamp strm = &(state->strm); |
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66 | |
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67 | /* allocate memory if this is the first time through */ |
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68 | if (state->size == 0 && gz_init(state) == -1) |
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69 | return -1; |
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70 | |
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71 | /* run deflate() on provided input until it produces no more output */ |
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72 | ret = Z_OK; |
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73 | do { |
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74 | /* write out current buffer contents if full, or if flushing, but if |
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75 | doing Z_FINISH then don't write until we get to Z_STREAM_END */ |
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76 | if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && |
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77 | (flush != Z_FINISH || ret == Z_STREAM_END))) { |
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78 | have = (unsigned)(strm->next_out - state->next); |
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79 | if (have && ((got = write(state->fd, state->next, have)) < 0 || |
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80 | (unsigned)got != have)) { |
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81 | gz_error(state, Z_ERRNO, zstrerror()); |
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82 | return -1; |
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83 | } |
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84 | if (strm->avail_out == 0) { |
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85 | strm->avail_out = state->size; |
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86 | strm->next_out = state->out; |
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87 | } |
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88 | state->next = strm->next_out; |
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89 | } |
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90 | |
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91 | /* compress */ |
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92 | have = strm->avail_out; |
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93 | ret = deflate(strm, flush); |
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94 | if (ret == Z_STREAM_ERROR) { |
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95 | gz_error(state, Z_STREAM_ERROR, |
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96 | "internal error: deflate stream corrupt"); |
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97 | return -1; |
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98 | } |
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99 | have -= strm->avail_out; |
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100 | } while (have); |
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101 | |
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102 | /* if that completed a deflate stream, allow another to start */ |
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103 | if (flush == Z_FINISH) |
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104 | deflateReset(strm); |
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105 | |
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106 | /* all done, no errors */ |
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107 | return 0; |
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108 | } |
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109 | |
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110 | /* Compress len zeros to output. Return -1 on error, 0 on success. */ |
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111 | local int gz_zero(state, len) |
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112 | gz_statep state; |
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113 | z_off64_t len; |
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114 | { |
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115 | int first; |
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116 | unsigned n; |
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117 | z_streamp strm = &(state->strm); |
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118 | |
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119 | /* consume whatever's left in the input buffer */ |
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120 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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121 | return -1; |
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122 | |
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123 | /* compress len zeros (len guaranteed > 0) */ |
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124 | first = 1; |
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125 | while (len) { |
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126 | n = GT_OFF(state->size) || (z_off64_t)state->size > len ? |
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127 | (unsigned)len : state->size; |
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128 | if (first) { |
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129 | memset(state->in, 0, n); |
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130 | first = 0; |
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131 | } |
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132 | strm->avail_in = n; |
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133 | strm->next_in = state->in; |
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134 | state->pos += n; |
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135 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
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136 | return -1; |
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137 | len -= n; |
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138 | } |
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139 | return 0; |
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140 | } |
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141 | |
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142 | /* -- see zlib.h -- */ |
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143 | int ZEXPORT gzwrite(file, buf, len) |
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144 | gzFile file; |
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145 | voidpc buf; |
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146 | unsigned len; |
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147 | { |
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148 | unsigned put = len; |
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149 | unsigned n; |
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150 | gz_statep state; |
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151 | z_streamp strm; |
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152 | |
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153 | /* get internal structure */ |
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154 | if (file == NULL) |
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155 | return 0; |
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156 | state = (gz_statep)file; |
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157 | strm = &(state->strm); |
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158 | |
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159 | /* check that we're writing and that there's no error */ |
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160 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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161 | return 0; |
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162 | |
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163 | /* since an int is returned, make sure len fits in one, otherwise return |
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164 | with an error (this avoids the flaw in the interface) */ |
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165 | if ((int)len < 0) { |
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166 | gz_error(state, Z_BUF_ERROR, "requested length does not fit in int"); |
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167 | return 0; |
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168 | } |
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169 | |
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170 | /* if len is zero, avoid unnecessary operations */ |
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171 | if (len == 0) |
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172 | return 0; |
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173 | |
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174 | /* allocate memory if this is the first time through */ |
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175 | if (state->size == 0 && gz_init(state) == -1) |
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176 | return 0; |
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177 | |
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178 | /* check for seek request */ |
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179 | if (state->seek) { |
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180 | state->seek = 0; |
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181 | if (gz_zero(state, state->skip) == -1) |
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182 | return 0; |
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183 | } |
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184 | |
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185 | /* for small len, copy to input buffer, otherwise compress directly */ |
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186 | if (len < state->size) { |
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187 | /* copy to input buffer, compress when full */ |
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188 | do { |
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189 | if (strm->avail_in == 0) |
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190 | strm->next_in = state->in; |
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191 | n = state->size - strm->avail_in; |
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192 | if (n > len) |
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193 | n = len; |
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194 | memcpy(strm->next_in + strm->avail_in, buf, n); |
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195 | strm->avail_in += n; |
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196 | state->pos += n; |
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197 | buf = (char *)buf + n; |
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198 | len -= n; |
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199 | if (len && gz_comp(state, Z_NO_FLUSH) == -1) |
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200 | return 0; |
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201 | } while (len); |
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202 | } |
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203 | else { |
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204 | /* consume whatever's left in the input buffer */ |
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205 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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206 | return 0; |
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207 | |
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208 | /* directly compress user buffer to file */ |
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209 | strm->avail_in = len; |
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210 | strm->next_in = (voidp)buf; |
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211 | state->pos += len; |
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212 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
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213 | return 0; |
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214 | } |
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215 | |
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216 | /* input was all buffered or compressed (put will fit in int) */ |
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217 | return (int)put; |
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218 | } |
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219 | |
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220 | /* -- see zlib.h -- */ |
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221 | int ZEXPORT gzputc(file, c) |
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222 | gzFile file; |
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223 | int c; |
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224 | { |
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225 | unsigned char buf[1]; |
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226 | gz_statep state; |
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227 | z_streamp strm; |
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228 | |
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229 | /* get internal structure */ |
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230 | if (file == NULL) |
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231 | return -1; |
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232 | state = (gz_statep)file; |
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233 | strm = &(state->strm); |
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234 | |
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235 | /* check that we're writing and that there's no error */ |
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236 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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237 | return -1; |
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238 | |
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239 | /* check for seek request */ |
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240 | if (state->seek) { |
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241 | state->seek = 0; |
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242 | if (gz_zero(state, state->skip) == -1) |
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243 | return -1; |
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244 | } |
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245 | |
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246 | /* try writing to input buffer for speed (state->size == 0 if buffer not |
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247 | initialized) */ |
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248 | if (strm->avail_in < state->size) { |
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249 | if (strm->avail_in == 0) |
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250 | strm->next_in = state->in; |
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251 | strm->next_in[strm->avail_in++] = c; |
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252 | state->pos++; |
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253 | return c; |
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254 | } |
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255 | |
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256 | /* no room in buffer or not initialized, use gz_write() */ |
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257 | buf[0] = c; |
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258 | if (gzwrite(file, buf, 1) != 1) |
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259 | return -1; |
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260 | return c; |
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261 | } |
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262 | |
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263 | /* -- see zlib.h -- */ |
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264 | int ZEXPORT gzputs(file, str) |
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265 | gzFile file; |
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266 | const char *str; |
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267 | { |
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268 | int ret; |
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269 | unsigned len; |
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270 | |
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271 | /* write string */ |
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272 | len = (unsigned)strlen(str); |
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273 | ret = gzwrite(file, str, len); |
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274 | return ret == 0 && len != 0 ? -1 : ret; |
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275 | } |
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276 | |
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277 | #ifdef STDC |
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278 | #include <stdarg.h> |
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279 | |
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280 | /* -- see zlib.h -- */ |
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281 | int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) |
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282 | { |
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283 | int size, len; |
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284 | gz_statep state; |
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285 | z_streamp strm; |
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286 | va_list va; |
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287 | |
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288 | /* get internal structure */ |
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289 | if (file == NULL) |
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290 | return -1; |
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291 | state = (gz_statep)file; |
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292 | strm = &(state->strm); |
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293 | |
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294 | /* check that we're writing and that there's no error */ |
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295 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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296 | return 0; |
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297 | |
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298 | /* make sure we have some buffer space */ |
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299 | if (state->size == 0 && gz_init(state) == -1) |
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300 | return 0; |
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301 | |
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302 | /* check for seek request */ |
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303 | if (state->seek) { |
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304 | state->seek = 0; |
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305 | if (gz_zero(state, state->skip) == -1) |
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306 | return 0; |
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307 | } |
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308 | |
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309 | /* consume whatever's left in the input buffer */ |
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310 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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311 | return 0; |
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312 | |
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313 | /* do the printf() into the input buffer, put length in len */ |
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314 | size = (int)(state->size); |
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315 | state->in[size - 1] = 0; |
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316 | va_start(va, format); |
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317 | #ifdef NO_vsnprintf |
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318 | # ifdef HAS_vsprintf_void |
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319 | (void)vsprintf(state->in, format, va); |
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320 | va_end(va); |
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321 | for (len = 0; len < size; len++) |
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322 | if (state->in[len] == 0) break; |
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323 | # else |
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324 | len = vsprintf(state->in, format, va); |
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325 | va_end(va); |
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326 | # endif |
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327 | #else |
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328 | # ifdef HAS_vsnprintf_void |
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329 | (void)vsnprintf(state->in, size, format, va); |
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330 | va_end(va); |
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331 | len = strlen(state->in); |
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332 | # else |
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333 | len = vsnprintf((char *)(state->in), size, format, va); |
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334 | va_end(va); |
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335 | # endif |
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336 | #endif |
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337 | |
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338 | /* check that printf() results fit in buffer */ |
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339 | if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
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340 | return 0; |
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341 | |
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342 | /* update buffer and position, defer compression until needed */ |
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343 | strm->avail_in = (unsigned)len; |
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344 | strm->next_in = state->in; |
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345 | state->pos += len; |
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346 | return len; |
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347 | } |
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348 | |
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349 | #else /* !STDC */ |
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350 | |
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351 | /* -- see zlib.h -- */ |
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352 | int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, |
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353 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) |
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354 | gzFile file; |
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355 | const char *format; |
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356 | int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, |
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357 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; |
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358 | { |
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359 | int size, len; |
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360 | gz_statep state; |
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361 | z_streamp strm; |
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362 | |
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363 | /* get internal structure */ |
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364 | if (file == NULL) |
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365 | return -1; |
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366 | state = (gz_statep)file; |
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367 | strm = &(state->strm); |
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368 | |
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369 | /* check that we're writing and that there's no error */ |
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370 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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371 | return 0; |
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372 | |
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373 | /* make sure we have some buffer space */ |
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374 | if (state->size == 0 && gz_init(state) == -1) |
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375 | return 0; |
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376 | |
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377 | /* check for seek request */ |
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378 | if (state->seek) { |
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379 | state->seek = 0; |
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380 | if (gz_zero(state, state->skip) == -1) |
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381 | return 0; |
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382 | } |
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383 | |
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384 | /* consume whatever's left in the input buffer */ |
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385 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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386 | return 0; |
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387 | |
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388 | /* do the printf() into the input buffer, put length in len */ |
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389 | size = (int)(state->size); |
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390 | state->in[size - 1] = 0; |
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391 | #ifdef NO_snprintf |
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392 | # ifdef HAS_sprintf_void |
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393 | sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8, |
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394 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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395 | for (len = 0; len < size; len++) |
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396 | if (state->in[len] == 0) break; |
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397 | # else |
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398 | len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8, |
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399 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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400 | # endif |
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401 | #else |
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402 | # ifdef HAS_snprintf_void |
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403 | snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
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404 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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405 | len = strlen(state->in); |
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406 | # else |
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407 | len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
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408 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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409 | # endif |
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410 | #endif |
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411 | |
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412 | /* check that printf() results fit in buffer */ |
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413 | if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
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414 | return 0; |
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415 | |
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416 | /* update buffer and position, defer compression until needed */ |
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417 | strm->avail_in = (unsigned)len; |
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418 | strm->next_in = state->in; |
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419 | state->pos += len; |
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420 | return len; |
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421 | } |
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422 | |
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423 | #endif |
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424 | |
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425 | /* -- see zlib.h -- */ |
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426 | int ZEXPORT gzflush(file, flush) |
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427 | gzFile file; |
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428 | int flush; |
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429 | { |
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430 | gz_statep state; |
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431 | |
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432 | /* get internal structure */ |
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433 | if (file == NULL) |
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434 | return -1; |
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435 | state = (gz_statep)file; |
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436 | |
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437 | /* check that we're writing and that there's no error */ |
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438 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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439 | return Z_STREAM_ERROR; |
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440 | |
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441 | /* check flush parameter */ |
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442 | if (flush < 0 || flush > Z_FINISH) |
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443 | return Z_STREAM_ERROR; |
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444 | |
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445 | /* check for seek request */ |
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446 | if (state->seek) { |
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447 | state->seek = 0; |
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448 | if (gz_zero(state, state->skip) == -1) |
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449 | return -1; |
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450 | } |
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451 | |
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452 | /* compress remaining data with requested flush */ |
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453 | gz_comp(state, flush); |
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454 | return state->err; |
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455 | } |
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456 | |
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457 | /* -- see zlib.h -- */ |
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458 | int ZEXPORT gzsetparams(file, level, strategy) |
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459 | gzFile file; |
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460 | int level; |
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461 | int strategy; |
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462 | { |
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463 | gz_statep state; |
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464 | z_streamp strm; |
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465 | |
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466 | /* get internal structure */ |
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467 | if (file == NULL) |
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468 | return Z_STREAM_ERROR; |
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469 | state = (gz_statep)file; |
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470 | strm = &(state->strm); |
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471 | |
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472 | /* check that we're writing and that there's no error */ |
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473 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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474 | return Z_STREAM_ERROR; |
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475 | |
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476 | /* if no change is requested, then do nothing */ |
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477 | if (level == state->level && strategy == state->strategy) |
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478 | return Z_OK; |
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479 | |
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480 | /* check for seek request */ |
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481 | if (state->seek) { |
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482 | state->seek = 0; |
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483 | if (gz_zero(state, state->skip) == -1) |
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484 | return -1; |
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485 | } |
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486 | |
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487 | /* change compression parameters for subsequent input */ |
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488 | if (state->size) { |
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489 | /* flush previous input with previous parameters before changing */ |
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490 | if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1) |
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491 | return state->err; |
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492 | deflateParams(strm, level, strategy); |
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493 | } |
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494 | state->level = level; |
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495 | state->strategy = strategy; |
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496 | return Z_OK; |
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497 | } |
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498 | |
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499 | /* -- see zlib.h -- */ |
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500 | int ZEXPORT gzclose_w(file) |
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501 | gzFile file; |
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502 | { |
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503 | int ret = 0; |
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504 | gz_statep state; |
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505 | |
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506 | /* get internal structure */ |
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507 | if (file == NULL) |
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508 | return Z_STREAM_ERROR; |
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509 | state = (gz_statep)file; |
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510 | |
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511 | /* check that we're writing */ |
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512 | if (state->mode != GZ_WRITE) |
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513 | return Z_STREAM_ERROR; |
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514 | |
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515 | /* check for seek request */ |
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516 | if (state->seek) { |
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517 | state->seek = 0; |
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518 | ret += gz_zero(state, state->skip); |
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519 | } |
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520 | |
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521 | /* flush, free memory, and close file */ |
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522 | ret += gz_comp(state, Z_FINISH); |
---|
523 | (void)deflateEnd(&(state->strm)); |
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524 | free(state->out); |
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525 | free(state->in); |
---|
526 | gz_error(state, Z_OK, NULL); |
---|
527 | free(state->path); |
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528 | ret += close(state->fd); |
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529 | free(state); |
---|
530 | return ret ? Z_ERRNO : Z_OK; |
---|
531 | } |
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