9e052883 |
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 | |
648db22b |
30 | extern int ZEXPORT unzRepair(const char* file, const char* fileOut, const char* fileOutTmp, uLong* nRecovered, uLong* bytesRecovered) { |
9e052883 |
31 | int err = Z_OK; |
32 | FILE* fpZip = fopen(file, "rb"); |
33 | FILE* fpOut = fopen(fileOut, "wb"); |
34 | FILE* fpOutCD = fopen(fileOutTmp, "wb"); |
35 | if (fpZip != NULL && fpOut != NULL) { |
36 | int entries = 0; |
37 | uLong totalBytes = 0; |
38 | char header[30]; |
39 | char filename[1024]; |
40 | char extra[1024]; |
41 | int offset = 0; |
42 | int offsetCD = 0; |
43 | while ( fread(header, 1, 30, fpZip) == 30 ) { |
44 | int currentOffset = offset; |
45 | |
46 | /* File entry */ |
47 | if (READ_32(header) == 0x04034b50) { |
48 | unsigned int version = READ_16(header + 4); |
49 | unsigned int gpflag = READ_16(header + 6); |
50 | unsigned int method = READ_16(header + 8); |
51 | unsigned int filetime = READ_16(header + 10); |
52 | unsigned int filedate = READ_16(header + 12); |
53 | unsigned int crc = READ_32(header + 14); /* crc */ |
54 | unsigned int cpsize = READ_32(header + 18); /* compressed size */ |
55 | unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */ |
56 | unsigned int fnsize = READ_16(header + 26); /* file name length */ |
57 | unsigned int extsize = READ_16(header + 28); /* extra field length */ |
58 | filename[0] = extra[0] = '\0'; |
59 | |
60 | /* Header */ |
61 | if (fwrite(header, 1, 30, fpOut) == 30) { |
62 | offset += 30; |
63 | } else { |
64 | err = Z_ERRNO; |
65 | break; |
66 | } |
67 | |
68 | /* Filename */ |
69 | if (fnsize > 0) { |
70 | if (fnsize < sizeof(filename)) { |
71 | if (fread(filename, 1, fnsize, fpZip) == fnsize) { |
72 | if (fwrite(filename, 1, fnsize, fpOut) == fnsize) { |
73 | offset += fnsize; |
74 | } else { |
75 | err = Z_ERRNO; |
76 | break; |
77 | } |
78 | } else { |
79 | err = Z_ERRNO; |
80 | break; |
81 | } |
82 | } else { |
83 | err = Z_ERRNO; |
84 | break; |
85 | } |
86 | } else { |
87 | err = Z_STREAM_ERROR; |
88 | break; |
89 | } |
90 | |
91 | /* Extra field */ |
92 | if (extsize > 0) { |
93 | if (extsize < sizeof(extra)) { |
94 | if (fread(extra, 1, extsize, fpZip) == extsize) { |
95 | if (fwrite(extra, 1, extsize, fpOut) == extsize) { |
96 | offset += extsize; |
97 | } else { |
98 | err = Z_ERRNO; |
99 | break; |
100 | } |
101 | } else { |
102 | err = Z_ERRNO; |
103 | break; |
104 | } |
105 | } else { |
106 | err = Z_ERRNO; |
107 | break; |
108 | } |
109 | } |
110 | |
111 | /* Data */ |
112 | { |
113 | int dataSize = cpsize; |
114 | if (dataSize == 0) { |
115 | dataSize = uncpsize; |
116 | } |
117 | if (dataSize > 0) { |
118 | char* data = malloc(dataSize); |
119 | if (data != NULL) { |
120 | if ((int)fread(data, 1, dataSize, fpZip) == dataSize) { |
121 | if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) { |
122 | offset += dataSize; |
123 | totalBytes += dataSize; |
124 | } else { |
125 | err = Z_ERRNO; |
126 | } |
127 | } else { |
128 | err = Z_ERRNO; |
129 | } |
130 | free(data); |
131 | if (err != Z_OK) { |
132 | break; |
133 | } |
134 | } else { |
135 | err = Z_MEM_ERROR; |
136 | break; |
137 | } |
138 | } |
139 | } |
140 | |
141 | /* Central directory entry */ |
142 | { |
143 | char header[46]; |
144 | char* comment = ""; |
145 | int comsize = (int) strlen(comment); |
146 | WRITE_32(header, 0x02014b50); |
147 | WRITE_16(header + 4, version); |
148 | WRITE_16(header + 6, version); |
149 | WRITE_16(header + 8, gpflag); |
150 | WRITE_16(header + 10, method); |
151 | WRITE_16(header + 12, filetime); |
152 | WRITE_16(header + 14, filedate); |
153 | WRITE_32(header + 16, crc); |
154 | WRITE_32(header + 20, cpsize); |
155 | WRITE_32(header + 24, uncpsize); |
156 | WRITE_16(header + 28, fnsize); |
157 | WRITE_16(header + 30, extsize); |
158 | WRITE_16(header + 32, comsize); |
159 | WRITE_16(header + 34, 0); /* disk # */ |
160 | WRITE_16(header + 36, 0); /* int attrb */ |
161 | WRITE_32(header + 38, 0); /* ext attrb */ |
162 | WRITE_32(header + 42, currentOffset); |
163 | /* Header */ |
164 | if (fwrite(header, 1, 46, fpOutCD) == 46) { |
165 | offsetCD += 46; |
166 | |
167 | /* Filename */ |
168 | if (fnsize > 0) { |
169 | if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) { |
170 | offsetCD += fnsize; |
171 | } else { |
172 | err = Z_ERRNO; |
173 | break; |
174 | } |
175 | } else { |
176 | err = Z_STREAM_ERROR; |
177 | break; |
178 | } |
179 | |
180 | /* Extra field */ |
181 | if (extsize > 0) { |
182 | if (fwrite(extra, 1, extsize, fpOutCD) == extsize) { |
183 | offsetCD += extsize; |
184 | } else { |
185 | err = Z_ERRNO; |
186 | break; |
187 | } |
188 | } |
189 | |
190 | /* Comment field */ |
191 | if (comsize > 0) { |
192 | if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) { |
193 | offsetCD += comsize; |
194 | } else { |
195 | err = Z_ERRNO; |
196 | break; |
197 | } |
198 | } |
199 | |
200 | |
201 | } else { |
202 | err = Z_ERRNO; |
203 | break; |
204 | } |
205 | } |
206 | |
207 | /* Success */ |
208 | entries++; |
209 | |
210 | } else { |
211 | break; |
212 | } |
213 | } |
214 | |
215 | /* Final central directory */ |
216 | { |
217 | int entriesZip = entries; |
218 | char header[22]; |
219 | char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools"; |
220 | int comsize = (int) strlen(comment); |
221 | if (entriesZip > 0xffff) { |
222 | entriesZip = 0xffff; |
223 | } |
224 | WRITE_32(header, 0x06054b50); |
225 | WRITE_16(header + 4, 0); /* disk # */ |
226 | WRITE_16(header + 6, 0); /* disk # */ |
227 | WRITE_16(header + 8, entriesZip); /* hack */ |
228 | WRITE_16(header + 10, entriesZip); /* hack */ |
229 | WRITE_32(header + 12, offsetCD); /* size of CD */ |
230 | WRITE_32(header + 16, offset); /* offset to CD */ |
231 | WRITE_16(header + 20, comsize); /* comment */ |
232 | |
233 | /* Header */ |
234 | if (fwrite(header, 1, 22, fpOutCD) == 22) { |
235 | |
236 | /* Comment field */ |
237 | if (comsize > 0) { |
238 | if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) { |
239 | err = Z_ERRNO; |
240 | } |
241 | } |
242 | |
243 | } else { |
244 | err = Z_ERRNO; |
245 | } |
246 | } |
247 | |
248 | /* Final merge (file + central directory) */ |
249 | fclose(fpOutCD); |
250 | if (err == Z_OK) { |
251 | fpOutCD = fopen(fileOutTmp, "rb"); |
252 | if (fpOutCD != NULL) { |
253 | int nRead; |
254 | char buffer[8192]; |
255 | while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) { |
256 | if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) { |
257 | err = Z_ERRNO; |
258 | break; |
259 | } |
260 | } |
261 | fclose(fpOutCD); |
262 | } |
263 | } |
264 | |
265 | /* Close */ |
266 | fclose(fpZip); |
267 | fclose(fpOut); |
268 | |
269 | /* Wipe temporary file */ |
270 | (void)remove(fileOutTmp); |
271 | |
272 | /* Number of recovered entries */ |
273 | if (err == Z_OK) { |
274 | if (nRecovered != NULL) { |
275 | *nRecovered = entries; |
276 | } |
277 | if (bytesRecovered != NULL) { |
278 | *bytesRecovered = totalBytes; |
279 | } |
280 | } |
281 | } else { |
282 | err = Z_STREAM_ERROR; |
283 | } |
284 | return err; |
285 | } |