source: trunk/minix/lib/zlib-1.2.3/contrib/minizip/mztools.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 7.8 KB
Line 
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
30extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
31const char* file;
32const char* fileOut;
33const char* fileOutTmp;
34uLong* nRecovered;
35uLong* 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[256];
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 (fread(filename, 1, fnsize, fpZip) == fnsize) {
77 if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
78 offset += fnsize;
79 } else {
80 err = Z_ERRNO;
81 break;
82 }
83 } else {
84 err = Z_ERRNO;
85 break;
86 }
87 } else {
88 err = Z_STREAM_ERROR;
89 break;
90 }
91
92 /* Extra field */
93 if (extsize > 0) {
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 }
106
107 /* Data */
108 {
109 int dataSize = cpsize;
110 if (dataSize == 0) {
111 dataSize = uncpsize;
112 }
113 if (dataSize > 0) {
114 char* data = malloc(dataSize);
115 if (data != NULL) {
116 if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
117 if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
118 offset += dataSize;
119 totalBytes += dataSize;
120 } else {
121 err = Z_ERRNO;
122 }
123 } else {
124 err = Z_ERRNO;
125 }
126 free(data);
127 if (err != Z_OK) {
128 break;
129 }
130 } else {
131 err = Z_MEM_ERROR;
132 break;
133 }
134 }
135 }
136
137 /* Central directory entry */
138 {
139 char header[46];
140 char* comment = "";
141 int comsize = (int) strlen(comment);
142 WRITE_32(header, 0x02014b50);
143 WRITE_16(header + 4, version);
144 WRITE_16(header + 6, version);
145 WRITE_16(header + 8, gpflag);
146 WRITE_16(header + 10, method);
147 WRITE_16(header + 12, filetime);
148 WRITE_16(header + 14, filedate);
149 WRITE_32(header + 16, crc);
150 WRITE_32(header + 20, cpsize);
151 WRITE_32(header + 24, uncpsize);
152 WRITE_16(header + 28, fnsize);
153 WRITE_16(header + 30, extsize);
154 WRITE_16(header + 32, comsize);
155 WRITE_16(header + 34, 0); /* disk # */
156 WRITE_16(header + 36, 0); /* int attrb */
157 WRITE_32(header + 38, 0); /* ext attrb */
158 WRITE_32(header + 42, currentOffset);
159 /* Header */
160 if (fwrite(header, 1, 46, fpOutCD) == 46) {
161 offsetCD += 46;
162
163 /* Filename */
164 if (fnsize > 0) {
165 if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
166 offsetCD += fnsize;
167 } else {
168 err = Z_ERRNO;
169 break;
170 }
171 } else {
172 err = Z_STREAM_ERROR;
173 break;
174 }
175
176 /* Extra field */
177 if (extsize > 0) {
178 if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
179 offsetCD += extsize;
180 } else {
181 err = Z_ERRNO;
182 break;
183 }
184 }
185
186 /* Comment field */
187 if (comsize > 0) {
188 if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
189 offsetCD += comsize;
190 } else {
191 err = Z_ERRNO;
192 break;
193 }
194 }
195
196
197 } else {
198 err = Z_ERRNO;
199 break;
200 }
201 }
202
203 /* Success */
204 entries++;
205
206 } else {
207 break;
208 }
209 }
210
211 /* Final central directory */
212 {
213 int entriesZip = entries;
214 char header[22];
215 char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
216 int comsize = (int) strlen(comment);
217 if (entriesZip > 0xffff) {
218 entriesZip = 0xffff;
219 }
220 WRITE_32(header, 0x06054b50);
221 WRITE_16(header + 4, 0); /* disk # */
222 WRITE_16(header + 6, 0); /* disk # */
223 WRITE_16(header + 8, entriesZip); /* hack */
224 WRITE_16(header + 10, entriesZip); /* hack */
225 WRITE_32(header + 12, offsetCD); /* size of CD */
226 WRITE_32(header + 16, offset); /* offset to CD */
227 WRITE_16(header + 20, comsize); /* comment */
228
229 /* Header */
230 if (fwrite(header, 1, 22, fpOutCD) == 22) {
231
232 /* Comment field */
233 if (comsize > 0) {
234 if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
235 err = Z_ERRNO;
236 }
237 }
238
239 } else {
240 err = Z_ERRNO;
241 }
242 }
243
244 /* Final merge (file + central directory) */
245 fclose(fpOutCD);
246 if (err == Z_OK) {
247 fpOutCD = fopen(fileOutTmp, "rb");
248 if (fpOutCD != NULL) {
249 int nRead;
250 char buffer[8192];
251 while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
252 if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
253 err = Z_ERRNO;
254 break;
255 }
256 }
257 fclose(fpOutCD);
258 }
259 }
260
261 /* Close */
262 fclose(fpZip);
263 fclose(fpOut);
264
265 /* Wipe temporary file */
266 (void)remove(fileOutTmp);
267
268 /* Number of recovered entries */
269 if (err == Z_OK) {
270 if (nRecovered != NULL) {
271 *nRecovered = entries;
272 }
273 if (bytesRecovered != NULL) {
274 *bytesRecovered = totalBytes;
275 }
276 }
277 } else {
278 err = Z_STREAM_ERROR;
279 }
280 return err;
281}
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