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1 /* |
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2 zip_source_deflate.c -- deflate (de)compressoin routines |
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3 Copyright (C) 2009-2015 Dieter Baron and Thomas Klausner |
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4 |
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5 This file is part of libzip, a library to manipulate ZIP archives. |
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6 The authors can be contacted at <libzip@nih.at> |
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7 |
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8 Redistribution and use in source and binary forms, with or without |
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9 modification, are permitted provided that the following conditions |
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10 are met: |
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11 1. Redistributions of source code must retain the above copyright |
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12 notice, this list of conditions and the following disclaimer. |
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13 2. Redistributions in binary form must reproduce the above copyright |
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14 notice, this list of conditions and the following disclaimer in |
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15 the documentation and/or other materials provided with the |
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16 distribution. |
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17 3. The names of the authors may not be used to endorse or promote |
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18 products derived from this software without specific prior |
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19 written permission. |
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20 |
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21 THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS |
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22 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
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25 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
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27 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
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29 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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30 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
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31 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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32 */ |
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33 |
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34 #include <stdlib.h> |
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35 #include <string.h> |
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36 #include <limits.h> |
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37 |
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38 #include "zipint.h" |
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39 |
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40 struct deflate { |
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41 zip_error_t error; |
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42 |
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43 bool eof; |
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44 bool can_store; |
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45 bool is_stored; |
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46 int mem_level; |
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47 zip_uint64_t size; |
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48 zip_uint8_t buffer[BUFSIZE]; |
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49 z_stream zstr; |
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50 }; |
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51 |
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52 static zip_int64_t compress_read(zip_source_t *, struct deflate *, void *, zip_uint64_t); |
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53 static zip_int64_t decompress_read(zip_source_t *, struct deflate *, void *, zip_uint64_t); |
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54 static zip_int64_t deflate_compress(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t); |
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55 static zip_int64_t deflate_decompress(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t); |
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56 static void deflate_free(struct deflate *); |
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57 |
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58 |
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59 zip_source_t * |
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60 zip_source_deflate(zip_t *za, zip_source_t *src, zip_int32_t cm, int flags) |
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61 { |
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62 struct deflate *ctx; |
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63 zip_source_t *s2; |
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64 |
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65 if (src == NULL || (cm != ZIP_CM_DEFLATE && !ZIP_CM_IS_DEFAULT(cm))) { |
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66 zip_error_set(&za->error, ZIP_ER_INVAL, 0); |
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67 return NULL; |
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68 } |
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69 |
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70 if ((ctx=(struct deflate *)malloc(sizeof(*ctx))) == NULL) { |
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71 zip_error_set(&za->error, ZIP_ER_MEMORY, 0); |
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72 return NULL; |
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73 } |
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74 |
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75 zip_error_init(&ctx->error); |
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76 ctx->eof = false; |
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77 ctx->is_stored = false; |
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78 ctx->can_store = ZIP_CM_IS_DEFAULT(cm); |
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79 if (flags & ZIP_CODEC_ENCODE) { |
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80 ctx->mem_level = MAX_MEM_LEVEL; |
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81 } |
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82 |
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83 if ((s2=zip_source_layered(za, src, |
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84 ((flags & ZIP_CODEC_ENCODE) |
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85 ? deflate_compress : deflate_decompress), |
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86 ctx)) == NULL) { |
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87 deflate_free(ctx); |
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88 return NULL; |
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89 } |
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90 |
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91 return s2; |
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92 } |
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93 |
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94 |
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95 static zip_int64_t |
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96 compress_read(zip_source_t *src, struct deflate *ctx, void *data, zip_uint64_t len) |
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97 { |
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98 int end, ret; |
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99 zip_int64_t n; |
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100 zip_uint64_t out_offset; |
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101 uInt out_len; |
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102 |
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103 if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK) |
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104 return -1; |
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105 |
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106 if (len == 0 || ctx->is_stored) { |
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107 return 0; |
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108 } |
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109 |
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110 out_offset = 0; |
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111 out_len = (uInt)ZIP_MIN(UINT_MAX, len); |
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112 ctx->zstr.next_out = (Bytef *)data; |
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113 ctx->zstr.avail_out = out_len; |
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114 |
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115 end = 0; |
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116 while (!end) { |
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117 ret = deflate(&ctx->zstr, ctx->eof ? Z_FINISH : 0); |
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118 |
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119 switch (ret) { |
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120 case Z_STREAM_END: |
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121 if (ctx->can_store && ctx->zstr.total_in <= ctx->zstr.total_out) { |
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122 ctx->is_stored = true; |
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123 ctx->size = ctx->zstr.total_in; |
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124 memcpy(data, ctx->buffer, ctx->size); |
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125 return (zip_int64_t)ctx->size; |
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126 } |
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127 /* fallthrough */ |
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128 case Z_OK: |
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129 /* all ok */ |
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130 |
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131 if (ctx->zstr.avail_out == 0) { |
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132 out_offset += out_len; |
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133 if (out_offset < len) { |
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134 out_len = (uInt)ZIP_MIN(UINT_MAX, len-out_offset); |
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135 ctx->zstr.next_out = (Bytef *)data+out_offset; |
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136 ctx->zstr.avail_out = out_len; |
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137 } |
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138 else { |
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139 ctx->can_store = false; |
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140 end = 1; |
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141 } |
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142 } |
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143 else if (ctx->eof && ctx->zstr.avail_in == 0) |
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144 end = 1; |
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145 break; |
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146 |
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147 case Z_BUF_ERROR: |
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148 if (ctx->zstr.avail_in == 0) { |
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149 if (ctx->eof) { |
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150 end = 1; |
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151 break; |
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152 } |
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153 |
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154 if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) { |
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155 _zip_error_set_from_source(&ctx->error, src); |
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156 end = 1; |
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157 break; |
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158 } |
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159 else if (n == 0) { |
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160 ctx->eof = true; |
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161 /* TODO: check against stat of src? */ |
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162 ctx->size = ctx->zstr.total_in; |
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163 } |
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164 else { |
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165 if (ctx->zstr.total_in > 0) { |
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166 /* we overwrote a previously filled ctx->buffer */ |
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167 ctx->can_store = false; |
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168 } |
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169 ctx->zstr.next_in = (Bytef *)ctx->buffer; |
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170 ctx->zstr.avail_in = (uInt)n; |
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171 } |
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172 continue; |
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173 } |
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174 /* fallthrough */ |
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175 case Z_NEED_DICT: |
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176 case Z_DATA_ERROR: |
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177 case Z_STREAM_ERROR: |
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178 case Z_MEM_ERROR: |
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179 zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret); |
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180 |
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181 end = 1; |
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182 break; |
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183 } |
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184 } |
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185 |
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186 if (ctx->zstr.avail_out < len) { |
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187 ctx->can_store = false; |
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188 return (zip_int64_t)(len - ctx->zstr.avail_out); |
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189 } |
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190 |
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191 return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1; |
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192 } |
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193 |
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194 |
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195 static zip_int64_t |
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196 decompress_read(zip_source_t *src, struct deflate *ctx, void *data, zip_uint64_t len) |
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197 { |
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198 int end, ret; |
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199 zip_int64_t n; |
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200 zip_uint64_t out_offset; |
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201 uInt out_len; |
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202 |
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203 if (zip_error_code_zip(&ctx->error) != ZIP_ER_OK) |
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204 return -1; |
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205 |
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206 if (len == 0) |
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207 return 0; |
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208 |
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209 out_offset = 0; |
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210 out_len = (uInt)ZIP_MIN(UINT_MAX, len); |
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211 ctx->zstr.next_out = (Bytef *)data; |
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212 ctx->zstr.avail_out = out_len; |
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213 |
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214 end = 0; |
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215 while (!end) { |
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216 ret = inflate(&ctx->zstr, Z_SYNC_FLUSH); |
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217 |
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218 switch (ret) { |
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219 case Z_OK: |
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220 if (ctx->zstr.avail_out == 0) { |
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221 out_offset += out_len; |
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222 if (out_offset < len) { |
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223 out_len = (uInt)ZIP_MIN(UINT_MAX, len-out_offset); |
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224 ctx->zstr.next_out = (Bytef *)data+out_offset; |
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225 ctx->zstr.avail_out = out_len; |
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226 } |
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227 else { |
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228 end = 1; |
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229 } |
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230 } |
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231 break; |
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232 |
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233 case Z_STREAM_END: |
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234 ctx->eof = 1; |
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235 end = 1; |
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236 break; |
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237 |
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238 case Z_BUF_ERROR: |
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239 if (ctx->zstr.avail_in == 0) { |
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240 if (ctx->eof) { |
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241 end = 1; |
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242 break; |
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243 } |
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244 |
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245 if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) { |
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246 _zip_error_set_from_source(&ctx->error, src); |
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247 end = 1; |
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248 break; |
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249 } |
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250 else if (n == 0) { |
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251 ctx->eof = 1; |
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252 } |
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253 else { |
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254 ctx->zstr.next_in = (Bytef *)ctx->buffer; |
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255 ctx->zstr.avail_in = (uInt)n; |
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256 } |
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257 continue; |
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258 } |
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259 /* fallthrough */ |
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260 case Z_NEED_DICT: |
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261 case Z_DATA_ERROR: |
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262 case Z_STREAM_ERROR: |
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263 case Z_MEM_ERROR: |
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264 zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret); |
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265 end = 1; |
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266 break; |
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267 } |
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268 } |
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269 |
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270 if (ctx->zstr.avail_out < len) |
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271 return (zip_int64_t)(len - ctx->zstr.avail_out); |
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272 |
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273 return (zip_error_code_zip(&ctx->error) == ZIP_ER_OK) ? 0 : -1; |
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274 } |
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275 |
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276 |
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277 static zip_int64_t |
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278 deflate_compress(zip_source_t *src, void *ud, void *data, zip_uint64_t len, zip_source_cmd_t cmd) |
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279 { |
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280 struct deflate *ctx; |
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281 int ret; |
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282 |
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283 ctx = (struct deflate *)ud; |
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284 |
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285 switch (cmd) { |
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286 case ZIP_SOURCE_OPEN: |
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287 ctx->zstr.zalloc = Z_NULL; |
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288 ctx->zstr.zfree = Z_NULL; |
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289 ctx->zstr.opaque = NULL; |
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290 ctx->zstr.avail_in = 0; |
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291 ctx->zstr.next_in = NULL; |
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292 ctx->zstr.avail_out = 0; |
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293 ctx->zstr.next_out = NULL; |
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294 |
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295 /* negative value to tell zlib not to write a header */ |
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296 if ((ret=deflateInit2(&ctx->zstr, Z_BEST_COMPRESSION, Z_DEFLATED, -MAX_WBITS, ctx->mem_level, Z_DEFAULT_STRATEGY)) != Z_OK) { |
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297 zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret); |
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298 return -1; |
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299 } |
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300 |
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301 return 0; |
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302 |
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303 case ZIP_SOURCE_READ: |
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304 return compress_read(src, ctx, data, len); |
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305 |
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306 case ZIP_SOURCE_CLOSE: |
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307 deflateEnd(&ctx->zstr); |
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308 return 0; |
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309 |
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310 case ZIP_SOURCE_STAT: |
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311 { |
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312 zip_stat_t *st; |
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313 |
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314 st = (zip_stat_t *)data; |
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315 |
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316 st->comp_method = ctx->is_stored ? ZIP_CM_STORE : ZIP_CM_DEFLATE; |
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317 st->valid |= ZIP_STAT_COMP_METHOD; |
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318 if (ctx->eof) { |
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319 st->comp_size = ctx->size; |
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320 st->valid |= ZIP_STAT_COMP_SIZE; |
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321 } |
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322 else |
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323 st->valid &= ~ZIP_STAT_COMP_SIZE; |
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324 } |
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325 return 0; |
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326 |
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327 case ZIP_SOURCE_ERROR: |
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328 return zip_error_to_data(&ctx->error, data, len); |
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329 |
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330 case ZIP_SOURCE_FREE: |
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331 deflate_free(ctx); |
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332 return 0; |
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333 |
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334 case ZIP_SOURCE_SUPPORTS: |
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335 return ZIP_SOURCE_SUPPORTS_READABLE; |
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336 |
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337 default: |
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338 zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0); |
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339 return -1; |
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340 } |
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341 } |
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342 |
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343 |
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344 static zip_int64_t |
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345 deflate_decompress(zip_source_t *src, void *ud, void *data, |
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346 zip_uint64_t len, zip_source_cmd_t cmd) |
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347 { |
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348 struct deflate *ctx; |
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349 zip_int64_t n; |
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350 int ret; |
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351 |
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352 ctx = (struct deflate *)ud; |
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353 |
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354 switch (cmd) { |
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355 case ZIP_SOURCE_OPEN: |
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356 if ((n=zip_source_read(src, ctx->buffer, sizeof(ctx->buffer))) < 0) { |
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357 _zip_error_set_from_source(&ctx->error, src); |
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358 return -1; |
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359 } |
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360 |
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361 ctx->zstr.zalloc = Z_NULL; |
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362 ctx->zstr.zfree = Z_NULL; |
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363 ctx->zstr.opaque = NULL; |
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364 ctx->zstr.next_in = (Bytef *)ctx->buffer; |
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365 ctx->zstr.avail_in = (uInt)n; |
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366 |
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367 /* negative value to tell zlib that there is no header */ |
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368 if ((ret=inflateInit2(&ctx->zstr, -MAX_WBITS)) != Z_OK) { |
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369 zip_error_set(&ctx->error, ZIP_ER_ZLIB, ret); |
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370 return -1; |
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371 } |
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372 return 0; |
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373 |
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374 case ZIP_SOURCE_READ: |
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375 return decompress_read(src, ctx, data, len); |
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376 |
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377 case ZIP_SOURCE_CLOSE: |
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378 inflateEnd(&ctx->zstr); |
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379 return 0; |
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380 |
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381 case ZIP_SOURCE_STAT: |
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382 { |
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383 zip_stat_t *st; |
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384 |
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385 st = (zip_stat_t *)data; |
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386 |
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387 st->comp_method = ZIP_CM_STORE; |
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388 if (st->comp_size > 0 && st->size > 0) |
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389 st->comp_size = st->size; |
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390 |
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391 return 0; |
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392 } |
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393 |
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394 case ZIP_SOURCE_ERROR: |
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395 return zip_error_to_data(&ctx->error, data, len); |
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396 |
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397 case ZIP_SOURCE_FREE: |
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398 free(ctx); |
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399 return 0; |
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400 |
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401 case ZIP_SOURCE_SUPPORTS: |
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402 return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, -1); |
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403 |
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404 default: |
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405 zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0); |
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406 return -1; |
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407 } |
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408 } |
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409 |
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410 |
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411 static void |
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412 deflate_free(struct deflate *ctx) |
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413 { |
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414 free(ctx); |
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415 } |
