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111
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1 /* gzread.c -- zlib functions for reading gzip files
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2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 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_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
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10 local int gz_avail OF((gz_statep));
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11 local int gz_look OF((gz_statep));
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12 local int gz_decomp OF((gz_statep));
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13 local int gz_fetch OF((gz_statep));
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14 local int gz_skip OF((gz_statep, z_off64_t));
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15 local z_size_t gz_read OF((gz_statep, voidp, z_size_t));
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16
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17 /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from
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18 state->fd, and update state->eof, state->err, and state->msg as appropriate.
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19 This function needs to loop on read(), since read() is not guaranteed to
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20 read the number of bytes requested, depending on the type of descriptor. */
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21 local int gz_load(state, buf, len, have)
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22 gz_statep state;
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23 unsigned char *buf;
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24 unsigned len;
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25 unsigned *have;
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26 {
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27 int ret;
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28 unsigned get, max = ((unsigned)-1 >> 2) + 1;
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29
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30 *have = 0;
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31 do {
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32 get = len - *have;
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33 if (get > max)
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34 get = max;
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35 ret = read(state->fd, buf + *have, get);
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36 if (ret <= 0)
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37 break;
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38 *have += (unsigned)ret;
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39 } while (*have < len);
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40 if (ret < 0) {
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41 gz_error(state, Z_ERRNO, zstrerror());
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42 return -1;
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43 }
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44 if (ret == 0)
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45 state->eof = 1;
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46 return 0;
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47 }
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48
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49 /* Load up input buffer and set eof flag if last data loaded -- return -1 on
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50 error, 0 otherwise. Note that the eof flag is set when the end of the input
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51 file is reached, even though there may be unused data in the buffer. Once
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52 that data has been used, no more attempts will be made to read the file.
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53 If strm->avail_in != 0, then the current data is moved to the beginning of
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54 the input buffer, and then the remainder of the buffer is loaded with the
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55 available data from the input file. */
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56 local int gz_avail(state)
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57 gz_statep state;
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58 {
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59 unsigned got;
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60 z_streamp strm = &(state->strm);
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61
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62 if (state->err != Z_OK && state->err != Z_BUF_ERROR)
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63 return -1;
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64 if (state->eof == 0) {
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65 if (strm->avail_in) { /* copy what's there to the start */
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66 unsigned char *p = state->in;
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67 unsigned const char *q = strm->next_in;
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68 unsigned n = strm->avail_in;
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69 do {
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70 *p++ = *q++;
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71 } while (--n);
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72 }
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73 if (gz_load(state, state->in + strm->avail_in,
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74 state->size - strm->avail_in, &got) == -1)
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75 return -1;
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76 strm->avail_in += got;
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77 strm->next_in = state->in;
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78 }
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79 return 0;
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80 }
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81
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82 /* Look for gzip header, set up for inflate or copy. state->x.have must be 0.
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83 If this is the first time in, allocate required memory. state->how will be
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84 left unchanged if there is no more input data available, will be set to COPY
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85 if there is no gzip header and direct copying will be performed, or it will
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86 be set to GZIP for decompression. If direct copying, then leftover input
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87 data from the input buffer will be copied to the output buffer. In that
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88 case, all further file reads will be directly to either the output buffer or
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89 a user buffer. If decompressing, the inflate state will be initialized.
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90 gz_look() will return 0 on success or -1 on failure. */
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91 local int gz_look(state)
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92 gz_statep state;
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93 {
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94 z_streamp strm = &(state->strm);
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95
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96 /* allocate read buffers and inflate memory */
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97 if (state->size == 0) {
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98 /* allocate buffers */
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99 state->in = (unsigned char *)malloc(state->want);
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100 state->out = (unsigned char *)malloc(state->want << 1);
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101 if (state->in == NULL || state->out == NULL) {
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102 free(state->out);
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103 free(state->in);
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104 gz_error(state, Z_MEM_ERROR, "out of memory");
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105 return -1;
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106 }
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107 state->size = state->want;
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108
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109 /* allocate inflate memory */
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110 state->strm.zalloc = Z_NULL;
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111 state->strm.zfree = Z_NULL;
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112 state->strm.opaque = Z_NULL;
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113 state->strm.avail_in = 0;
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114 state->strm.next_in = Z_NULL;
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115 if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) { /* gunzip */
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116 free(state->out);
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117 free(state->in);
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118 state->size = 0;
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119 gz_error(state, Z_MEM_ERROR, "out of memory");
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120 return -1;
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121 }
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122 }
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123
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124 /* get at least the magic bytes in the input buffer */
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125 if (strm->avail_in < 2) {
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126 if (gz_avail(state) == -1)
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127 return -1;
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128 if (strm->avail_in == 0)
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129 return 0;
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130 }
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131
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132 /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
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133 a logical dilemma here when considering the case of a partially written
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134 gzip file, to wit, if a single 31 byte is written, then we cannot tell
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135 whether this is a single-byte file, or just a partially written gzip
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136 file -- for here we assume that if a gzip file is being written, then
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137 the header will be written in a single operation, so that reading a
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138 single byte is sufficient indication that it is not a gzip file) */
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139 if (strm->avail_in > 1 &&
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140 strm->next_in[0] == 31 && strm->next_in[1] == 139) {
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141 inflateReset(strm);
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142 state->how = GZIP;
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143 state->direct = 0;
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144 return 0;
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145 }
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146
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147 /* no gzip header -- if we were decoding gzip before, then this is trailing
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148 garbage. Ignore the trailing garbage and finish. */
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149 if (state->direct == 0) {
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150 strm->avail_in = 0;
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151 state->eof = 1;
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152 state->x.have = 0;
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153 return 0;
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154 }
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155
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156 /* doing raw i/o, copy any leftover input to output -- this assumes that
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157 the output buffer is larger than the input buffer, which also assures
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158 space for gzungetc() */
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159 state->x.next = state->out;
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160 if (strm->avail_in) {
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161 memcpy(state->x.next, strm->next_in, strm->avail_in);
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162 state->x.have = strm->avail_in;
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163 strm->avail_in = 0;
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164 }
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165 state->how = COPY;
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166 state->direct = 1;
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167 return 0;
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168 }
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169
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170 /* Decompress from input to the provided next_out and avail_out in the state.
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171 On return, state->x.have and state->x.next point to the just decompressed
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172 data. If the gzip stream completes, state->how is reset to LOOK to look for
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173 the next gzip stream or raw data, once state->x.have is depleted. Returns 0
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174 on success, -1 on failure. */
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175 local int gz_decomp(state)
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176 gz_statep state;
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177 {
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178 int ret = Z_OK;
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179 unsigned had;
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180 z_streamp strm = &(state->strm);
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181
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182 /* fill output buffer up to end of deflate stream */
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183 had = strm->avail_out;
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184 do {
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185 /* get more input for inflate() */
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186 if (strm->avail_in == 0 && gz_avail(state) == -1)
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187 return -1;
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188 if (strm->avail_in == 0) {
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189 gz_error(state, Z_BUF_ERROR, "unexpected end of file");
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190 break;
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191 }
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192
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193 /* decompress and handle errors */
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194 ret = inflate(strm, Z_NO_FLUSH);
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195 if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
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196 gz_error(state, Z_STREAM_ERROR,
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197 "internal error: inflate stream corrupt");
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198 return -1;
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199 }
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200 if (ret == Z_MEM_ERROR) {
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201 gz_error(state, Z_MEM_ERROR, "out of memory");
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202 return -1;
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203 }
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204 if (ret == Z_DATA_ERROR) { /* deflate stream invalid */
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205 gz_error(state, Z_DATA_ERROR,
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206 strm->msg == NULL ? "compressed data error" : strm->msg);
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207 return -1;
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208 }
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209 } while (strm->avail_out && ret != Z_STREAM_END);
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210
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211 /* update available output */
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212 state->x.have = had - strm->avail_out;
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213 state->x.next = strm->next_out - state->x.have;
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214
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215 /* if the gzip stream completed successfully, look for another */
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216 if (ret == Z_STREAM_END)
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217 state->how = LOOK;
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218
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219 /* good decompression */
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220 return 0;
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221 }
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222
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223 /* Fetch data and put it in the output buffer. Assumes state->x.have is 0.
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224 Data is either copied from the input file or decompressed from the input
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225 file depending on state->how. If state->how is LOOK, then a gzip header is
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226 looked for to determine whether to copy or decompress. Returns -1 on error,
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227 otherwise 0. gz_fetch() will leave state->how as COPY or GZIP unless the
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228 end of the input file has been reached and all data has been processed. */
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229 local int gz_fetch(state)
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230 gz_statep state;
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231 {
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232 z_streamp strm = &(state->strm);
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233
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234 do {
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235 switch(state->how) {
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236 case LOOK: /* -> LOOK, COPY (only if never GZIP), or GZIP */
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237 if (gz_look(state) == -1)
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238 return -1;
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239 if (state->how == LOOK)
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240 return 0;
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241 break;
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242 case COPY: /* -> COPY */
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243 if (gz_load(state, state->out, state->size << 1, &(state->x.have))
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244 == -1)
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245 return -1;
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246 state->x.next = state->out;
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247 return 0;
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248 case GZIP: /* -> GZIP or LOOK (if end of gzip stream) */
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249 strm->avail_out = state->size << 1;
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250 strm->next_out = state->out;
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251 if (gz_decomp(state) == -1)
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252 return -1;
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253 }
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254 } while (state->x.have == 0 && (!state->eof || strm->avail_in));
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255 return 0;
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256 }
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257
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258 /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */
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259 local int gz_skip(state, len)
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260 gz_statep state;
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261 z_off64_t len;
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262 {
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263 unsigned n;
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264
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265 /* skip over len bytes or reach end-of-file, whichever comes first */
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266 while (len)
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267 /* skip over whatever is in output buffer */
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268 if (state->x.have) {
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269 n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
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270 (unsigned)len : state->x.have;
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271 state->x.have -= n;
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272 state->x.next += n;
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273 state->x.pos += n;
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274 len -= n;
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275 }
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276
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277 /* output buffer empty -- return if we're at the end of the input */
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278 else if (state->eof && state->strm.avail_in == 0)
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279 break;
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280
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281 /* need more data to skip -- load up output buffer */
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282 else {
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283 /* get more output, looking for header if required */
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284 if (gz_fetch(state) == -1)
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285 return -1;
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286 }
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287 return 0;
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288 }
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289
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290 /* Read len bytes into buf from file, or less than len up to the end of the
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291 input. Return the number of bytes read. If zero is returned, either the
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292 end of file was reached, or there was an error. state->err must be
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293 consulted in that case to determine which. */
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294 local z_size_t gz_read(state, buf, len)
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295 gz_statep state;
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296 voidp buf;
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297 z_size_t len;
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298 {
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299 z_size_t got;
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300 unsigned n;
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301
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302 /* if len is zero, avoid unnecessary operations */
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303 if (len == 0)
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304 return 0;
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305
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306 /* process a skip request */
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307 if (state->seek) {
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308 state->seek = 0;
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309 if (gz_skip(state, state->skip) == -1)
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310 return 0;
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311 }
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312
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313 /* get len bytes to buf, or less than len if at the end */
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314 got = 0;
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315 do {
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316 /* set n to the maximum amount of len that fits in an unsigned int */
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317 n = -1;
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318 if (n > len)
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319 n = len;
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320
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321 /* first just try copying data from the output buffer */
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322 if (state->x.have) {
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323 if (state->x.have < n)
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324 n = state->x.have;
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325 memcpy(buf, state->x.next, n);
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326 state->x.next += n;
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327 state->x.have -= n;
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328 }
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329
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330 /* output buffer empty -- return if we're at the end of the input */
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331 else if (state->eof && state->strm.avail_in == 0) {
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332 state->past = 1; /* tried to read past end */
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333 break;
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334 }
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335
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336 /* need output data -- for small len or new stream load up our output
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337 buffer */
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338 else if (state->how == LOOK || n < (state->size << 1)) {
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339 /* get more output, looking for header if required */
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340 if (gz_fetch(state) == -1)
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341 return 0;
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342 continue; /* no progress yet -- go back to copy above */
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343 /* the copy above assures that we will leave with space in the
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344 output buffer, allowing at least one gzungetc() to succeed */
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345 }
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346
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347 /* large len -- read directly into user buffer */
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348 else if (state->how == COPY) { /* read directly */
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349 if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
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350 return 0;
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351 }
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352
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353 /* large len -- decompress directly into user buffer */
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354 else { /* state->how == GZIP */
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355 state->strm.avail_out = n;
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356 state->strm.next_out = (unsigned char *)buf;
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357 if (gz_decomp(state) == -1)
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358 return 0;
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359 n = state->x.have;
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360 state->x.have = 0;
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361 }
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362
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363 /* update progress */
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364 len -= n;
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365 buf = (char *)buf + n;
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366 got += n;
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367 state->x.pos += n;
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368 } while (len);
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369
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370 /* return number of bytes read into user buffer */
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371 return got;
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372 }
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373
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374 /* -- see zlib.h -- */
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375 int ZEXPORT gzread(file, buf, len)
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376 gzFile file;
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377 voidp buf;
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378 unsigned len;
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379 {
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380 gz_statep state;
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381
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382 /* get internal structure */
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383 if (file == NULL)
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384 return -1;
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385 state = (gz_statep)file;
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386
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387 /* check that we're reading and that there's no (serious) error */
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388 if (state->mode != GZ_READ ||
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389 (state->err != Z_OK && state->err != Z_BUF_ERROR))
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390 return -1;
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391
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392 /* since an int is returned, make sure len fits in one, otherwise return
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393 with an error (this avoids a flaw in the interface) */
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394 if ((int)len < 0) {
|
|
|
395 gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
|
|
|
396 return -1;
|
|
|
397 }
|
|
|
398
|
|
|
399 /* read len or fewer bytes to buf */
|
|
|
400 len = gz_read(state, buf, len);
|
|
|
401
|
|
|
402 /* check for an error */
|
|
|
403 if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
|
|
|
404 return -1;
|
|
|
405
|
|
|
406 /* return the number of bytes read (this is assured to fit in an int) */
|
|
|
407 return (int)len;
|
|
|
408 }
|
|
|
409
|
|
|
410 /* -- see zlib.h -- */
|
|
|
411 z_size_t ZEXPORT gzfread(buf, size, nitems, file)
|
|
|
412 voidp buf;
|
|
|
413 z_size_t size;
|
|
|
414 z_size_t nitems;
|
|
|
415 gzFile file;
|
|
|
416 {
|
|
|
417 z_size_t len;
|
|
|
418 gz_statep state;
|
|
|
419
|
|
|
420 /* get internal structure */
|
|
|
421 if (file == NULL)
|
|
|
422 return 0;
|
|
|
423 state = (gz_statep)file;
|
|
|
424
|
|
|
425 /* check that we're reading and that there's no (serious) error */
|
|
|
426 if (state->mode != GZ_READ ||
|
|
|
427 (state->err != Z_OK && state->err != Z_BUF_ERROR))
|
|
|
428 return 0;
|
|
|
429
|
|
|
430 /* compute bytes to read -- error on overflow */
|
|
|
431 len = nitems * size;
|
|
|
432 if (size && len / size != nitems) {
|
|
|
433 gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
|
|
|
434 return 0;
|
|
|
435 }
|
|
|
436
|
|
|
437 /* read len or fewer bytes to buf, return the number of full items read */
|
|
|
438 return len ? gz_read(state, buf, len) / size : 0;
|
|
|
439 }
|
|
|
440
|
|
|
441 /* -- see zlib.h -- */
|
|
|
442 #ifdef Z_PREFIX_SET
|
|
|
443 # undef z_gzgetc
|
|
|
444 #else
|
|
|
445 # undef gzgetc
|
|
|
446 #endif
|
|
|
447 int ZEXPORT gzgetc(file)
|
|
|
448 gzFile file;
|
|
|
449 {
|
|
|
450 int ret;
|
|
|
451 unsigned char buf[1];
|
|
|
452 gz_statep state;
|
|
|
453
|
|
|
454 /* get internal structure */
|
|
|
455 if (file == NULL)
|
|
|
456 return -1;
|
|
|
457 state = (gz_statep)file;
|
|
|
458
|
|
|
459 /* check that we're reading and that there's no (serious) error */
|
|
|
460 if (state->mode != GZ_READ ||
|
|
|
461 (state->err != Z_OK && state->err != Z_BUF_ERROR))
|
|
|
462 return -1;
|
|
|
463
|
|
|
464 /* try output buffer (no need to check for skip request) */
|
|
|
465 if (state->x.have) {
|
|
|
466 state->x.have--;
|
|
|
467 state->x.pos++;
|
|
|
468 return *(state->x.next)++;
|
|
|
469 }
|
|
|
470
|
|
|
471 /* nothing there -- try gz_read() */
|
|
|
472 ret = gz_read(state, buf, 1);
|
|
|
473 return ret < 1 ? -1 : buf[0];
|
|
|
474 }
|
|
|
475
|
|
|
476 int ZEXPORT gzgetc_(file)
|
|
|
477 gzFile file;
|
|
|
478 {
|
|
|
479 return gzgetc(file);
|
|
|
480 }
|
|
|
481
|
|
|
482 /* -- see zlib.h -- */
|
|
|
483 int ZEXPORT gzungetc(c, file)
|
|
|
484 int c;
|
|
|
485 gzFile file;
|
|
|
486 {
|
|
|
487 gz_statep state;
|
|
|
488
|
|
|
489 /* get internal structure */
|
|
|
490 if (file == NULL)
|
|
|
491 return -1;
|
|
|
492 state = (gz_statep)file;
|
|
|
493
|
|
|
494 /* check that we're reading and that there's no (serious) error */
|
|
|
495 if (state->mode != GZ_READ ||
|
|
|
496 (state->err != Z_OK && state->err != Z_BUF_ERROR))
|
|
|
497 return -1;
|
|
|
498
|
|
|
499 /* process a skip request */
|
|
|
500 if (state->seek) {
|
|
|
501 state->seek = 0;
|
|
|
502 if (gz_skip(state, state->skip) == -1)
|
|
|
503 return -1;
|
|
|
504 }
|
|
|
505
|
|
|
506 /* can't push EOF */
|
|
|
507 if (c < 0)
|
|
|
508 return -1;
|
|
|
509
|
|
|
510 /* if output buffer empty, put byte at end (allows more pushing) */
|
|
|
511 if (state->x.have == 0) {
|
|
|
512 state->x.have = 1;
|
|
|
513 state->x.next = state->out + (state->size << 1) - 1;
|
|
|
514 state->x.next[0] = (unsigned char)c;
|
|
|
515 state->x.pos--;
|
|
|
516 state->past = 0;
|
|
|
517 return c;
|
|
|
518 }
|
|
|
519
|
|
|
520 /* if no room, give up (must have already done a gzungetc()) */
|
|
|
521 if (state->x.have == (state->size << 1)) {
|
|
|
522 gz_error(state, Z_DATA_ERROR, "out of room to push characters");
|
|
|
523 return -1;
|
|
|
524 }
|
|
|
525
|
|
|
526 /* slide output data if needed and insert byte before existing data */
|
|
|
527 if (state->x.next == state->out) {
|
|
|
528 unsigned char *src = state->out + state->x.have;
|
|
|
529 unsigned char *dest = state->out + (state->size << 1);
|
|
|
530 while (src > state->out)
|
|
|
531 *--dest = *--src;
|
|
|
532 state->x.next = dest;
|
|
|
533 }
|
|
|
534 state->x.have++;
|
|
|
535 state->x.next--;
|
|
|
536 state->x.next[0] = (unsigned char)c;
|
|
|
537 state->x.pos--;
|
|
|
538 state->past = 0;
|
|
|
539 return c;
|
|
|
540 }
|
|
|
541
|
|
|
542 /* -- see zlib.h -- */
|
|
|
543 char * ZEXPORT gzgets(file, buf, len)
|
|
|
544 gzFile file;
|
|
|
545 char *buf;
|
|
|
546 int len;
|
|
|
547 {
|
|
|
548 unsigned left, n;
|
|
|
549 char *str;
|
|
|
550 unsigned char *eol;
|
|
|
551 gz_statep state;
|
|
|
552
|
|
|
553 /* check parameters and get internal structure */
|
|
|
554 if (file == NULL || buf == NULL || len < 1)
|
|
|
555 return NULL;
|
|
|
556 state = (gz_statep)file;
|
|
|
557
|
|
|
558 /* check that we're reading and that there's no (serious) error */
|
|
|
559 if (state->mode != GZ_READ ||
|
|
|
560 (state->err != Z_OK && state->err != Z_BUF_ERROR))
|
|
|
561 return NULL;
|
|
|
562
|
|
|
563 /* process a skip request */
|
|
|
564 if (state->seek) {
|
|
|
565 state->seek = 0;
|
|
|
566 if (gz_skip(state, state->skip) == -1)
|
|
|
567 return NULL;
|
|
|
568 }
|
|
|
569
|
|
|
570 /* copy output bytes up to new line or len - 1, whichever comes first --
|
|
|
571 append a terminating zero to the string (we don't check for a zero in
|
|
|
572 the contents, let the user worry about that) */
|
|
|
573 str = buf;
|
|
|
574 left = (unsigned)len - 1;
|
|
|
575 if (left) do {
|
|
|
576 /* assure that something is in the output buffer */
|
|
|
577 if (state->x.have == 0 && gz_fetch(state) == -1)
|
|
|
578 return NULL; /* error */
|
|
|
579 if (state->x.have == 0) { /* end of file */
|
|
|
580 state->past = 1; /* read past end */
|
|
|
581 break; /* return what we have */
|
|
|
582 }
|
|
|
583
|
|
|
584 /* look for end-of-line in current output buffer */
|
|
|
585 n = state->x.have > left ? left : state->x.have;
|
|
|
586 eol = (unsigned char *)memchr(state->x.next, '\n', n);
|
|
|
587 if (eol != NULL)
|
|
|
588 n = (unsigned)(eol - state->x.next) + 1;
|
|
|
589
|
|
|
590 /* copy through end-of-line, or remainder if not found */
|
|
|
591 memcpy(buf, state->x.next, n);
|
|
|
592 state->x.have -= n;
|
|
|
593 state->x.next += n;
|
|
|
594 state->x.pos += n;
|
|
|
595 left -= n;
|
|
|
596 buf += n;
|
|
|
597 } while (left && eol == NULL);
|
|
|
598
|
|
|
599 /* return terminated string, or if nothing, end of file */
|
|
|
600 if (buf == str)
|
|
|
601 return NULL;
|
|
|
602 buf[0] = 0;
|
|
|
603 return str;
|
|
|
604 }
|
|
|
605
|
|
|
606 /* -- see zlib.h -- */
|
|
|
607 int ZEXPORT gzdirect(file)
|
|
|
608 gzFile file;
|
|
|
609 {
|
|
|
610 gz_statep state;
|
|
|
611
|
|
|
612 /* get internal structure */
|
|
|
613 if (file == NULL)
|
|
|
614 return 0;
|
|
|
615 state = (gz_statep)file;
|
|
|
616
|
|
|
617 /* if the state is not known, but we can find out, then do so (this is
|
|
|
618 mainly for right after a gzopen() or gzdopen()) */
|
|
|
619 if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
|
|
|
620 (void)gz_look(state);
|
|
|
621
|
|
|
622 /* return 1 if transparent, 0 if processing a gzip stream */
|
|
|
623 return state->direct;
|
|
|
624 }
|
|
|
625
|
|
|
626 /* -- see zlib.h -- */
|
|
|
627 int ZEXPORT gzclose_r(file)
|
|
|
628 gzFile file;
|
|
|
629 {
|
|
|
630 int ret, err;
|
|
|
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 reading */
|
|
|
639 if (state->mode != GZ_READ)
|
|
|
640 return Z_STREAM_ERROR;
|
|
|
641
|
|
|
642 /* free memory and close file */
|
|
|
643 if (state->size) {
|
|
|
644 inflateEnd(&(state->strm));
|
|
|
645 free(state->out);
|
|
|
646 free(state->in);
|
|
|
647 }
|
|
|
648 err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
|
|
|
649 gz_error(state, Z_OK, NULL);
|
|
|
650 free(state->path);
|
|
|
651 ret = close(state->fd);
|
|
|
652 free(state);
|
|
|
653 return ret ? Z_ERRNO : err;
|
|
|
654 }
|
