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jesus fucking christ that was easy... written a test prog "zipcat" to try out zlib's contrib library "minizip", to list and read files out of zip archives directly...
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 04 Nov 2013 06:46:17 +0200
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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 }