Commit | Line | Data |
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5ca28f79 L |
1 | /* |
2 | Additional tools for Minizip | |
3 | Code: Xavier Roche '2004 | |
4 | License: Same as ZLIB (www.gzip.org) | |
5 | */ | |
6 | ||
7 | /* Code */ | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <string.h> | |
11 | #include "zlib.h" | |
12 | #include "unzip.h" | |
13 | ||
14 | #define READ_8(adr) ((unsigned char)*(adr)) | |
15 | #define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) ) | |
16 | #define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) ) | |
17 | ||
18 | #define WRITE_8(buff, n) do { \ | |
19 | *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \ | |
20 | } while(0) | |
21 | #define WRITE_16(buff, n) do { \ | |
22 | WRITE_8((unsigned char*)(buff), n); \ | |
23 | WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \ | |
24 | } while(0) | |
25 | #define WRITE_32(buff, n) do { \ | |
26 | WRITE_16((unsigned char*)(buff), (n) & 0xffff); \ | |
27 | WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \ | |
28 | } while(0) | |
29 | ||
30 | extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered) | |
31 | const char* file; | |
32 | const char* fileOut; | |
33 | const char* fileOutTmp; | |
34 | uLong* nRecovered; | |
35 | uLong* bytesRecovered; | |
36 | { | |
37 | int err = Z_OK; | |
38 | FILE* fpZip = fopen(file, "rb"); | |
39 | FILE* fpOut = fopen(fileOut, "wb"); | |
40 | FILE* fpOutCD = fopen(fileOutTmp, "wb"); | |
41 | if (fpZip != NULL && fpOut != NULL) { | |
42 | int entries = 0; | |
43 | uLong totalBytes = 0; | |
44 | char header[30]; | |
45 | char filename[1024]; | |
46 | char extra[1024]; | |
47 | int offset = 0; | |
48 | int offsetCD = 0; | |
49 | while ( fread(header, 1, 30, fpZip) == 30 ) { | |
50 | int currentOffset = offset; | |
51 | ||
52 | /* File entry */ | |
53 | if (READ_32(header) == 0x04034b50) { | |
54 | unsigned int version = READ_16(header + 4); | |
55 | unsigned int gpflag = READ_16(header + 6); | |
56 | unsigned int method = READ_16(header + 8); | |
57 | unsigned int filetime = READ_16(header + 10); | |
58 | unsigned int filedate = READ_16(header + 12); | |
59 | unsigned int crc = READ_32(header + 14); /* crc */ | |
60 | unsigned int cpsize = READ_32(header + 18); /* compressed size */ | |
61 | unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */ | |
62 | unsigned int fnsize = READ_16(header + 26); /* file name length */ | |
63 | unsigned int extsize = READ_16(header + 28); /* extra field length */ | |
64 | filename[0] = extra[0] = '\0'; | |
65 | ||
66 | /* Header */ | |
67 | if (fwrite(header, 1, 30, fpOut) == 30) { | |
68 | offset += 30; | |
69 | } else { | |
70 | err = Z_ERRNO; | |
71 | break; | |
72 | } | |
73 | ||
74 | /* Filename */ | |
75 | if (fnsize > 0) { | |
76 | if (fnsize < sizeof(filename)) { | |
77 | if (fread(filename, 1, fnsize, fpZip) == fnsize) { | |
78 | if (fwrite(filename, 1, fnsize, fpOut) == fnsize) { | |
79 | offset += fnsize; | |
80 | } else { | |
81 | err = Z_ERRNO; | |
82 | break; | |
83 | } | |
84 | } else { | |
85 | err = Z_ERRNO; | |
86 | break; | |
87 | } | |
88 | } else { | |
89 | err = Z_ERRNO; | |
90 | break; | |
91 | } | |
92 | } else { | |
93 | err = Z_STREAM_ERROR; | |
94 | break; | |
95 | } | |
96 | ||
97 | /* Extra field */ | |
98 | if (extsize > 0) { | |
99 | if (extsize < sizeof(extra)) { | |
100 | if (fread(extra, 1, extsize, fpZip) == extsize) { | |
101 | if (fwrite(extra, 1, extsize, fpOut) == extsize) { | |
102 | offset += extsize; | |
103 | } else { | |
104 | err = Z_ERRNO; | |
105 | break; | |
106 | } | |
107 | } else { | |
108 | err = Z_ERRNO; | |
109 | break; | |
110 | } | |
111 | } else { | |
112 | err = Z_ERRNO; | |
113 | break; | |
114 | } | |
115 | } | |
116 | ||
117 | /* Data */ | |
118 | { | |
119 | int dataSize = cpsize; | |
120 | if (dataSize == 0) { | |
121 | dataSize = uncpsize; | |
122 | } | |
123 | if (dataSize > 0) { | |
124 | char* data = malloc(dataSize); | |
125 | if (data != NULL) { | |
126 | if ((int)fread(data, 1, dataSize, fpZip) == dataSize) { | |
127 | if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) { | |
128 | offset += dataSize; | |
129 | totalBytes += dataSize; | |
130 | } else { | |
131 | err = Z_ERRNO; | |
132 | } | |
133 | } else { | |
134 | err = Z_ERRNO; | |
135 | } | |
136 | free(data); | |
137 | if (err != Z_OK) { | |
138 | break; | |
139 | } | |
140 | } else { | |
141 | err = Z_MEM_ERROR; | |
142 | break; | |
143 | } | |
144 | } | |
145 | } | |
146 | ||
147 | /* Central directory entry */ | |
148 | { | |
149 | char header[46]; | |
150 | char* comment = ""; | |
151 | int comsize = (int) strlen(comment); | |
152 | WRITE_32(header, 0x02014b50); | |
153 | WRITE_16(header + 4, version); | |
154 | WRITE_16(header + 6, version); | |
155 | WRITE_16(header + 8, gpflag); | |
156 | WRITE_16(header + 10, method); | |
157 | WRITE_16(header + 12, filetime); | |
158 | WRITE_16(header + 14, filedate); | |
159 | WRITE_32(header + 16, crc); | |
160 | WRITE_32(header + 20, cpsize); | |
161 | WRITE_32(header + 24, uncpsize); | |
162 | WRITE_16(header + 28, fnsize); | |
163 | WRITE_16(header + 30, extsize); | |
164 | WRITE_16(header + 32, comsize); | |
165 | WRITE_16(header + 34, 0); /* disk # */ | |
166 | WRITE_16(header + 36, 0); /* int attrb */ | |
167 | WRITE_32(header + 38, 0); /* ext attrb */ | |
168 | WRITE_32(header + 42, currentOffset); | |
169 | /* Header */ | |
170 | if (fwrite(header, 1, 46, fpOutCD) == 46) { | |
171 | offsetCD += 46; | |
172 | ||
173 | /* Filename */ | |
174 | if (fnsize > 0) { | |
175 | if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) { | |
176 | offsetCD += fnsize; | |
177 | } else { | |
178 | err = Z_ERRNO; | |
179 | break; | |
180 | } | |
181 | } else { | |
182 | err = Z_STREAM_ERROR; | |
183 | break; | |
184 | } | |
185 | ||
186 | /* Extra field */ | |
187 | if (extsize > 0) { | |
188 | if (fwrite(extra, 1, extsize, fpOutCD) == extsize) { | |
189 | offsetCD += extsize; | |
190 | } else { | |
191 | err = Z_ERRNO; | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
196 | /* Comment field */ | |
197 | if (comsize > 0) { | |
198 | if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) { | |
199 | offsetCD += comsize; | |
200 | } else { | |
201 | err = Z_ERRNO; | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | ||
207 | } else { | |
208 | err = Z_ERRNO; | |
209 | break; | |
210 | } | |
211 | } | |
212 | ||
213 | /* Success */ | |
214 | entries++; | |
215 | ||
216 | } else { | |
217 | break; | |
218 | } | |
219 | } | |
220 | ||
221 | /* Final central directory */ | |
222 | { | |
223 | int entriesZip = entries; | |
224 | char header[22]; | |
225 | char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools"; | |
226 | int comsize = (int) strlen(comment); | |
227 | if (entriesZip > 0xffff) { | |
228 | entriesZip = 0xffff; | |
229 | } | |
230 | WRITE_32(header, 0x06054b50); | |
231 | WRITE_16(header + 4, 0); /* disk # */ | |
232 | WRITE_16(header + 6, 0); /* disk # */ | |
233 | WRITE_16(header + 8, entriesZip); /* hack */ | |
234 | WRITE_16(header + 10, entriesZip); /* hack */ | |
235 | WRITE_32(header + 12, offsetCD); /* size of CD */ | |
236 | WRITE_32(header + 16, offset); /* offset to CD */ | |
237 | WRITE_16(header + 20, comsize); /* comment */ | |
238 | ||
239 | /* Header */ | |
240 | if (fwrite(header, 1, 22, fpOutCD) == 22) { | |
241 | ||
242 | /* Comment field */ | |
243 | if (comsize > 0) { | |
244 | if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) { | |
245 | err = Z_ERRNO; | |
246 | } | |
247 | } | |
248 | ||
249 | } else { | |
250 | err = Z_ERRNO; | |
251 | } | |
252 | } | |
253 | ||
254 | /* Final merge (file + central directory) */ | |
255 | fclose(fpOutCD); | |
256 | if (err == Z_OK) { | |
257 | fpOutCD = fopen(fileOutTmp, "rb"); | |
258 | if (fpOutCD != NULL) { | |
259 | int nRead; | |
260 | char buffer[8192]; | |
261 | while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) { | |
262 | if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) { | |
263 | err = Z_ERRNO; | |
264 | break; | |
265 | } | |
266 | } | |
267 | fclose(fpOutCD); | |
268 | } | |
269 | } | |
270 | ||
271 | /* Close */ | |
272 | fclose(fpZip); | |
273 | fclose(fpOut); | |
274 | ||
275 | /* Wipe temporary file */ | |
276 | (void)remove(fileOutTmp); | |
277 | ||
278 | /* Number of recovered entries */ | |
279 | if (err == Z_OK) { | |
280 | if (nRecovered != NULL) { | |
281 | *nRecovered = entries; | |
282 | } | |
283 | if (bytesRecovered != NULL) { | |
284 | *bytesRecovered = totalBytes; | |
285 | } | |
286 | } | |
287 | } else { | |
288 | err = Z_STREAM_ERROR; | |
289 | } | |
290 | return err; | |
291 | } |