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 | |
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 | } |