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111
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1 /* gzwrite.c -- zlib functions for writing gzip files
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2 * Copyright (C) 2004-2017 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 local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
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13
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14 /* Initialize state for writing a gzip file. Mark initialization by setting
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15 state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
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16 success. */
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17 local int gz_init(state)
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18 gz_statep state;
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19 {
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20 int ret;
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21 z_streamp strm = &(state->strm);
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22
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23 /* allocate input buffer (double size for gzprintf) */
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24 state->in = (unsigned char *)malloc(state->want << 1);
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25 if (state->in == NULL) {
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26 gz_error(state, Z_MEM_ERROR, "out of memory");
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27 return -1;
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28 }
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29
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30 /* only need output buffer and deflate state if compressing */
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31 if (!state->direct) {
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32 /* allocate output buffer */
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33 state->out = (unsigned char *)malloc(state->want);
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34 if (state->out == NULL) {
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35 free(state->in);
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36 gz_error(state, Z_MEM_ERROR, "out of memory");
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37 return -1;
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38 }
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39
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40 /* allocate deflate memory, set up for gzip compression */
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41 strm->zalloc = Z_NULL;
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42 strm->zfree = Z_NULL;
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43 strm->opaque = Z_NULL;
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44 ret = deflateInit2(strm, state->level, Z_DEFLATED,
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45 MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
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46 if (ret != Z_OK) {
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47 free(state->out);
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48 free(state->in);
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49 gz_error(state, Z_MEM_ERROR, "out of memory");
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50 return -1;
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51 }
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52 strm->next_in = NULL;
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53 }
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54
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55 /* mark state as initialized */
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56 state->size = state->want;
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57
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58 /* initialize write buffer if compressing */
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59 if (!state->direct) {
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60 strm->avail_out = state->size;
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61 strm->next_out = state->out;
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62 state->x.next = strm->next_out;
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63 }
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64 return 0;
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65 }
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66
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67 /* Compress whatever is at avail_in and next_in and write to the output file.
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68 Return -1 if there is an error writing to the output file or if gz_init()
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69 fails to allocate memory, otherwise 0. flush is assumed to be a valid
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70 deflate() flush value. If flush is Z_FINISH, then the deflate() state is
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71 reset to start a new gzip stream. If gz->direct is true, then simply write
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72 to the output file without compressing, and ignore flush. */
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73 local int gz_comp(state, flush)
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74 gz_statep state;
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75 int flush;
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76 {
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77 int ret, writ;
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78 unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
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79 z_streamp strm = &(state->strm);
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80
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81 /* allocate memory if this is the first time through */
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82 if (state->size == 0 && gz_init(state) == -1)
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83 return -1;
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84
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85 /* write directly if requested */
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86 if (state->direct) {
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87 while (strm->avail_in) {
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88 put = strm->avail_in > max ? max : strm->avail_in;
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89 writ = write(state->fd, strm->next_in, put);
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90 if (writ < 0) {
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91 gz_error(state, Z_ERRNO, zstrerror());
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92 return -1;
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93 }
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94 strm->avail_in -= (unsigned)writ;
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95 strm->next_in += writ;
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96 }
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97 return 0;
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98 }
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99
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100 /* run deflate() on provided input until it produces no more output */
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101 ret = Z_OK;
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102 do {
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103 /* write out current buffer contents if full, or if flushing, but if
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104 doing Z_FINISH then don't write until we get to Z_STREAM_END */
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105 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
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106 (flush != Z_FINISH || ret == Z_STREAM_END))) {
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107 while (strm->next_out > state->x.next) {
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108 put = strm->next_out - state->x.next > (int)max ? max :
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109 (unsigned)(strm->next_out - state->x.next);
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110 writ = write(state->fd, state->x.next, put);
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111 if (writ < 0) {
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112 gz_error(state, Z_ERRNO, zstrerror());
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113 return -1;
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114 }
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115 state->x.next += writ;
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116 }
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117 if (strm->avail_out == 0) {
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118 strm->avail_out = state->size;
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119 strm->next_out = state->out;
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120 state->x.next = state->out;
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121 }
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122 }
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123
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124 /* compress */
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125 have = strm->avail_out;
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126 ret = deflate(strm, flush);
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127 if (ret == Z_STREAM_ERROR) {
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128 gz_error(state, Z_STREAM_ERROR,
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129 "internal error: deflate stream corrupt");
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130 return -1;
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131 }
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132 have -= strm->avail_out;
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133 } while (have);
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134
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135 /* if that completed a deflate stream, allow another to start */
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136 if (flush == Z_FINISH)
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137 deflateReset(strm);
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138
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139 /* all done, no errors */
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140 return 0;
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141 }
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142
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143 /* Compress len zeros to output. Return -1 on a write error or memory
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144 allocation failure by gz_comp(), or 0 on success. */
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145 local int gz_zero(state, len)
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146 gz_statep state;
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147 z_off64_t len;
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148 {
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149 int first;
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150 unsigned n;
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151 z_streamp strm = &(state->strm);
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152
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153 /* consume whatever's left in the input buffer */
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154 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
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155 return -1;
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156
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157 /* compress len zeros (len guaranteed > 0) */
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158 first = 1;
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159 while (len) {
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160 n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
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161 (unsigned)len : state->size;
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162 if (first) {
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163 memset(state->in, 0, n);
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164 first = 0;
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165 }
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166 strm->avail_in = n;
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167 strm->next_in = state->in;
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168 state->x.pos += n;
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169 if (gz_comp(state, Z_NO_FLUSH) == -1)
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170 return -1;
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171 len -= n;
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172 }
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173 return 0;
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174 }
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175
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176 /* Write len bytes from buf to file. Return the number of bytes written. If
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177 the returned value is less than len, then there was an error. */
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178 local z_size_t gz_write(state, buf, len)
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179 gz_statep state;
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180 voidpc buf;
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181 z_size_t len;
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182 {
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183 z_size_t put = len;
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184
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185 /* if len is zero, avoid unnecessary operations */
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186 if (len == 0)
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187 return 0;
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188
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189 /* allocate memory if this is the first time through */
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190 if (state->size == 0 && gz_init(state) == -1)
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191 return 0;
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192
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193 /* check for seek request */
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194 if (state->seek) {
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195 state->seek = 0;
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196 if (gz_zero(state, state->skip) == -1)
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197 return 0;
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198 }
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199
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200 /* for small len, copy to input buffer, otherwise compress directly */
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201 if (len < state->size) {
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202 /* copy to input buffer, compress when full */
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203 do {
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204 unsigned have, copy;
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205
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206 if (state->strm.avail_in == 0)
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207 state->strm.next_in = state->in;
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208 have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
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209 state->in);
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210 copy = state->size - have;
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211 if (copy > len)
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212 copy = len;
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213 memcpy(state->in + have, buf, copy);
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214 state->strm.avail_in += copy;
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215 state->x.pos += copy;
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216 buf = (const char *)buf + copy;
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217 len -= copy;
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218 if (len && gz_comp(state, Z_NO_FLUSH) == -1)
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219 return 0;
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220 } while (len);
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221 }
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222 else {
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223 /* consume whatever's left in the input buffer */
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224 if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
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225 return 0;
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226
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227 /* directly compress user buffer to file */
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228 state->strm.next_in = (z_const Bytef *)buf;
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229 do {
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230 unsigned n = (unsigned)-1;
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231 if (n > len)
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232 n = len;
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233 state->strm.avail_in = n;
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234 state->x.pos += n;
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235 if (gz_comp(state, Z_NO_FLUSH) == -1)
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236 return 0;
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237 len -= n;
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238 } while (len);
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239 }
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240
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241 /* input was all buffered or compressed */
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242 return put;
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243 }
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244
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245 /* -- see zlib.h -- */
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246 int ZEXPORT gzwrite(file, buf, len)
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247 gzFile file;
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248 voidpc buf;
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249 unsigned len;
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250 {
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251 gz_statep state;
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252
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253 /* get internal structure */
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254 if (file == NULL)
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255 return 0;
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256 state = (gz_statep)file;
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257
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258 /* check that we're writing and that there's no error */
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259 if (state->mode != GZ_WRITE || state->err != Z_OK)
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260 return 0;
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261
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262 /* since an int is returned, make sure len fits in one, otherwise return
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263 with an error (this avoids a flaw in the interface) */
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264 if ((int)len < 0) {
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265 gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
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266 return 0;
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267 }
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268
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269 /* write len bytes from buf (the return value will fit in an int) */
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270 return (int)gz_write(state, buf, len);
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271 }
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272
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273 /* -- see zlib.h -- */
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274 z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
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275 voidpc buf;
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276 z_size_t size;
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277 z_size_t nitems;
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278 gzFile file;
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279 {
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280 z_size_t len;
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281 gz_statep state;
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282
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283 /* get internal structure */
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284 if (file == NULL)
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285 return 0;
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286 state = (gz_statep)file;
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287
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288 /* check that we're writing and that there's no error */
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289 if (state->mode != GZ_WRITE || state->err != Z_OK)
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290 return 0;
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291
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292 /* compute bytes to read -- error on overflow */
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293 len = nitems * size;
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294 if (size && len / size != nitems) {
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295 gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
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296 return 0;
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297 }
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298
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299 /* write len bytes to buf, return the number of full items written */
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300 return len ? gz_write(state, buf, len) / size : 0;
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301 }
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302
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303 /* -- see zlib.h -- */
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304 int ZEXPORT gzputc(file, c)
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305 gzFile file;
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306 int c;
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307 {
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308 unsigned have;
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309 unsigned char buf[1];
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310 gz_statep state;
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311 z_streamp strm;
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312
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313 /* get internal structure */
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314 if (file == NULL)
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315 return -1;
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316 state = (gz_statep)file;
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317 strm = &(state->strm);
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318
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319 /* check that we're writing and that there's no error */
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320 if (state->mode != GZ_WRITE || state->err != Z_OK)
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321 return -1;
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322
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323 /* check for seek request */
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324 if (state->seek) {
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325 state->seek = 0;
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326 if (gz_zero(state, state->skip) == -1)
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327 return -1;
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328 }
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329
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330 /* try writing to input buffer for speed (state->size == 0 if buffer not
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331 initialized) */
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332 if (state->size) {
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333 if (strm->avail_in == 0)
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334 strm->next_in = state->in;
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335 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
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336 if (have < state->size) {
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337 state->in[have] = (unsigned char)c;
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338 strm->avail_in++;
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339 state->x.pos++;
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340 return c & 0xff;
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341 }
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342 }
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343
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344 /* no room in buffer or not initialized, use gz_write() */
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345 buf[0] = (unsigned char)c;
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346 if (gz_write(state, buf, 1) != 1)
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347 return -1;
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348 return c & 0xff;
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349 }
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350
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351 /* -- see zlib.h -- */
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352 int ZEXPORT gzputs(file, str)
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353 gzFile file;
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354 const char *str;
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355 {
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356 int ret;
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357 z_size_t len;
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358 gz_statep state;
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359
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360 /* get internal structure */
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361 if (file == NULL)
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362 return -1;
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363 state = (gz_statep)file;
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364
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365 /* check that we're writing and that there's no error */
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366 if (state->mode != GZ_WRITE || state->err != Z_OK)
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367 return -1;
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368
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369 /* write string */
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370 len = strlen(str);
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371 ret = gz_write(state, str, len);
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372 return ret == 0 && len != 0 ? -1 : ret;
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373 }
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374
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375 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
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376 #include <stdarg.h>
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377
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378 /* -- see zlib.h -- */
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379 int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
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380 {
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381 int len;
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382 unsigned left;
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383 char *next;
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384 gz_statep state;
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385 z_streamp strm;
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386
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387 /* get internal structure */
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388 if (file == NULL)
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389 return Z_STREAM_ERROR;
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390 state = (gz_statep)file;
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391 strm = &(state->strm);
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392
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393 /* check that we're writing and that there's no error */
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394 if (state->mode != GZ_WRITE || state->err != Z_OK)
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395 return Z_STREAM_ERROR;
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396
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397 /* make sure we have some buffer space */
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398 if (state->size == 0 && gz_init(state) == -1)
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399 return state->err;
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400
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401 /* check for seek request */
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402 if (state->seek) {
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403 state->seek = 0;
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404 if (gz_zero(state, state->skip) == -1)
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405 return state->err;
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406 }
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407
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408 /* do the printf() into the input buffer, put length in len -- the input
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409 buffer is double-sized just for this function, so there is guaranteed to
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410 be state->size bytes available after the current contents */
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411 if (strm->avail_in == 0)
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412 strm->next_in = state->in;
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|
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413 next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
|
|
|
414 next[state->size - 1] = 0;
|
|
|
415 #ifdef NO_vsnprintf
|
|
|
416 # ifdef HAS_vsprintf_void
|
|
|
417 (void)vsprintf(next, format, va);
|
|
|
418 for (len = 0; len < state->size; len++)
|
|
|
419 if (next[len] == 0) break;
|
|
|
420 # else
|
|
|
421 len = vsprintf(next, format, va);
|
|
|
422 # endif
|
|
|
423 #else
|
|
|
424 # ifdef HAS_vsnprintf_void
|
|
|
425 (void)vsnprintf(next, state->size, format, va);
|
|
|
426 len = strlen(next);
|
|
|
427 # else
|
|
|
428 len = vsnprintf(next, state->size, format, va);
|
|
|
429 # endif
|
|
|
430 #endif
|
|
|
431
|
|
|
432 /* check that printf() results fit in buffer */
|
|
|
433 if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
|
|
|
434 return 0;
|
|
|
435
|
|
|
436 /* update buffer and position, compress first half if past that */
|
|
|
437 strm->avail_in += (unsigned)len;
|
|
|
438 state->x.pos += len;
|
|
|
439 if (strm->avail_in >= state->size) {
|
|
|
440 left = strm->avail_in - state->size;
|
|
|
441 strm->avail_in = state->size;
|
|
|
442 if (gz_comp(state, Z_NO_FLUSH) == -1)
|
|
|
443 return state->err;
|
|
|
444 memcpy(state->in, state->in + state->size, left);
|
|
|
445 strm->next_in = state->in;
|
|
|
446 strm->avail_in = left;
|
|
|
447 }
|
|
|
448 return len;
|
|
|
449 }
|
|
|
450
|
|
|
451 int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
|
|
|
452 {
|
|
|
453 va_list va;
|
|
|
454 int ret;
|
|
|
455
|
|
|
456 va_start(va, format);
|
|
|
457 ret = gzvprintf(file, format, va);
|
|
|
458 va_end(va);
|
|
|
459 return ret;
|
|
|
460 }
|
|
|
461
|
|
|
462 #else /* !STDC && !Z_HAVE_STDARG_H */
|
|
|
463
|
|
|
464 /* -- see zlib.h -- */
|
|
|
465 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
|
|
|
466 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
|
|
|
467 gzFile file;
|
|
|
468 const char *format;
|
|
|
469 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
|
|
|
470 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
|
|
|
471 {
|
|
|
472 unsigned len, left;
|
|
|
473 char *next;
|
|
|
474 gz_statep state;
|
|
|
475 z_streamp strm;
|
|
|
476
|
|
|
477 /* get internal structure */
|
|
|
478 if (file == NULL)
|
|
|
479 return Z_STREAM_ERROR;
|
|
|
480 state = (gz_statep)file;
|
|
|
481 strm = &(state->strm);
|
|
|
482
|
|
|
483 /* check that can really pass pointer in ints */
|
|
|
484 if (sizeof(int) != sizeof(void *))
|
|
|
485 return Z_STREAM_ERROR;
|
|
|
486
|
|
|
487 /* check that we're writing and that there's no error */
|
|
|
488 if (state->mode != GZ_WRITE || state->err != Z_OK)
|
|
|
489 return Z_STREAM_ERROR;
|
|
|
490
|
|
|
491 /* make sure we have some buffer space */
|
|
|
492 if (state->size == 0 && gz_init(state) == -1)
|
|
|
493 return state->error;
|
|
|
494
|
|
|
495 /* check for seek request */
|
|
|
496 if (state->seek) {
|
|
|
497 state->seek = 0;
|
|
|
498 if (gz_zero(state, state->skip) == -1)
|
|
|
499 return state->error;
|
|
|
500 }
|
|
|
501
|
|
|
502 /* do the printf() into the input buffer, put length in len -- the input
|
|
|
503 buffer is double-sized just for this function, so there is guaranteed to
|
|
|
504 be state->size bytes available after the current contents */
|
|
|
505 if (strm->avail_in == 0)
|
|
|
506 strm->next_in = state->in;
|
|
|
507 next = (char *)(strm->next_in + strm->avail_in);
|
|
|
508 next[state->size - 1] = 0;
|
|
|
509 #ifdef NO_snprintf
|
|
|
510 # ifdef HAS_sprintf_void
|
|
|
511 sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
|
|
|
512 a13, a14, a15, a16, a17, a18, a19, a20);
|
|
|
513 for (len = 0; len < size; len++)
|
|
|
514 if (next[len] == 0)
|
|
|
515 break;
|
|
|
516 # else
|
|
|
517 len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
|
|
|
518 a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
|
|
519 # endif
|
|
|
520 #else
|
|
|
521 # ifdef HAS_snprintf_void
|
|
|
522 snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
|
|
|
523 a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
|
|
524 len = strlen(next);
|
|
|
525 # else
|
|
|
526 len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
|
|
|
527 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
|
|
528 # endif
|
|
|
529 #endif
|
|
|
530
|
|
|
531 /* check that printf() results fit in buffer */
|
|
|
532 if (len == 0 || len >= state->size || next[state->size - 1] != 0)
|
|
|
533 return 0;
|
|
|
534
|
|
|
535 /* update buffer and position, compress first half if past that */
|
|
|
536 strm->avail_in += len;
|
|
|
537 state->x.pos += len;
|
|
|
538 if (strm->avail_in >= state->size) {
|
|
|
539 left = strm->avail_in - state->size;
|
|
|
540 strm->avail_in = state->size;
|
|
|
541 if (gz_comp(state, Z_NO_FLUSH) == -1)
|
|
|
542 return state->err;
|
|
|
543 memcpy(state->in, state->in + state->size, left);
|
|
|
544 strm->next_in = state->in;
|
|
|
545 strm->avail_in = left;
|
|
|
546 }
|
|
|
547 return (int)len;
|
|
|
548 }
|
|
|
549
|
|
|
550 #endif
|
|
|
551
|
|
|
552 /* -- see zlib.h -- */
|
|
|
553 int ZEXPORT gzflush(file, flush)
|
|
|
554 gzFile file;
|
|
|
555 int flush;
|
|
|
556 {
|
|
|
557 gz_statep state;
|
|
|
558
|
|
|
559 /* get internal structure */
|
|
|
560 if (file == NULL)
|
|
|
561 return Z_STREAM_ERROR;
|
|
|
562 state = (gz_statep)file;
|
|
|
563
|
|
|
564 /* check that we're writing and that there's no error */
|
|
|
565 if (state->mode != GZ_WRITE || state->err != Z_OK)
|
|
|
566 return Z_STREAM_ERROR;
|
|
|
567
|
|
|
568 /* check flush parameter */
|
|
|
569 if (flush < 0 || flush > Z_FINISH)
|
|
|
570 return Z_STREAM_ERROR;
|
|
|
571
|
|
|
572 /* check for seek request */
|
|
|
573 if (state->seek) {
|
|
|
574 state->seek = 0;
|
|
|
575 if (gz_zero(state, state->skip) == -1)
|
|
|
576 return state->err;
|
|
|
577 }
|
|
|
578
|
|
|
579 /* compress remaining data with requested flush */
|
|
|
580 (void)gz_comp(state, flush);
|
|
|
581 return state->err;
|
|
|
582 }
|
|
|
583
|
|
|
584 /* -- see zlib.h -- */
|
|
|
585 int ZEXPORT gzsetparams(file, level, strategy)
|
|
|
586 gzFile file;
|
|
|
587 int level;
|
|
|
588 int strategy;
|
|
|
589 {
|
|
|
590 gz_statep state;
|
|
|
591 z_streamp strm;
|
|
|
592
|
|
|
593 /* get internal structure */
|
|
|
594 if (file == NULL)
|
|
|
595 return Z_STREAM_ERROR;
|
|
|
596 state = (gz_statep)file;
|
|
|
597 strm = &(state->strm);
|
|
|
598
|
|
|
599 /* check that we're writing and that there's no error */
|
|
|
600 if (state->mode != GZ_WRITE || state->err != Z_OK)
|
|
|
601 return Z_STREAM_ERROR;
|
|
|
602
|
|
|
603 /* if no change is requested, then do nothing */
|
|
|
604 if (level == state->level && strategy == state->strategy)
|
|
|
605 return Z_OK;
|
|
|
606
|
|
|
607 /* check for seek request */
|
|
|
608 if (state->seek) {
|
|
|
609 state->seek = 0;
|
|
|
610 if (gz_zero(state, state->skip) == -1)
|
|
|
611 return state->err;
|
|
|
612 }
|
|
|
613
|
|
|
614 /* change compression parameters for subsequent input */
|
|
|
615 if (state->size) {
|
|
|
616 /* flush previous input with previous parameters before changing */
|
|
|
617 if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
|
|
|
618 return state->err;
|
|
|
619 deflateParams(strm, level, strategy);
|
|
|
620 }
|
|
|
621 state->level = level;
|
|
|
622 state->strategy = strategy;
|
|
|
623 return Z_OK;
|
|
|
624 }
|
|
|
625
|
|
|
626 /* -- see zlib.h -- */
|
|
|
627 int ZEXPORT gzclose_w(file)
|
|
|
628 gzFile file;
|
|
|
629 {
|
|
|
630 int ret = Z_OK;
|
|
|
631 gz_statep state;
|
|
|
632
|
|
|
633 /* get internal structure */
|
|
|
634 if (file == NULL)
|
|
|
635 return Z_STREAM_ERROR;
|
|
|
636 state = (gz_statep)file;
|
|
|
637
|
|
|
638 /* check that we're writing */
|
|
|
639 if (state->mode != GZ_WRITE)
|
|
|
640 return Z_STREAM_ERROR;
|
|
|
641
|
|
|
642 /* check for seek request */
|
|
|
643 if (state->seek) {
|
|
|
644 state->seek = 0;
|
|
|
645 if (gz_zero(state, state->skip) == -1)
|
|
|
646 ret = state->err;
|
|
|
647 }
|
|
|
648
|
|
|
649 /* flush, free memory, and close file */
|
|
|
650 if (gz_comp(state, Z_FINISH) == -1)
|
|
|
651 ret = state->err;
|
|
|
652 if (state->size) {
|
|
|
653 if (!state->direct) {
|
|
|
654 (void)deflateEnd(&(state->strm));
|
|
|
655 free(state->out);
|
|
|
656 }
|
|
|
657 free(state->in);
|
|
|
658 }
|
|
|
659 gz_error(state, Z_OK, NULL);
|
|
|
660 free(state->path);
|
|
|
661 if (close(state->fd) == -1)
|
|
|
662 ret = Z_ERRNO;
|
|
|
663 free(state);
|
|
|
664 return ret;
|
|
|
665 }
|
