2 Additional tools for Minizip
3 Code: Xavier Roche '2004
4 License: Same as ZLIB (www.gzip.org)
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) )
18 #define WRITE_8(buff, n) do { \
19 *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \
21 #define WRITE_16(buff, n) do { \
22 WRITE_8((unsigned char*)(buff), n); \
23 WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \
25 #define WRITE_32(buff, n) do { \
26 WRITE_16((unsigned char*)(buff), (n) & 0xffff); \
27 WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \
30 extern int ZEXPORT unzRepair(const char* file, const char* fileOut, const char* fileOutTmp, uLong* nRecovered, uLong* bytesRecovered) {
32 FILE* fpZip = fopen(file, "rb");
33 FILE* fpOut = fopen(fileOut, "wb");
34 FILE* fpOutCD = fopen(fileOutTmp, "wb");
35 if (fpZip != NULL && fpOut != NULL) {
43 while ( fread(header, 1, 30, fpZip) == 30 ) {
44 int currentOffset = offset;
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';
61 if (fwrite(header, 1, 30, fpOut) == 30) {
70 if (fnsize < sizeof(filename)) {
71 if (fread(filename, 1, fnsize, fpZip) == fnsize) {
72 if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
93 if (extsize < sizeof(extra)) {
94 if (fread(extra, 1, extsize, fpZip) == extsize) {
95 if (fwrite(extra, 1, extsize, fpOut) == extsize) {
113 int dataSize = cpsize;
118 char* data = malloc(dataSize);
120 if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
121 if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
123 totalBytes += dataSize;
141 /* Central directory entry */
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);
164 if (fwrite(header, 1, 46, fpOutCD) == 46) {
169 if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
176 err = Z_STREAM_ERROR;
182 if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
192 if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
215 /* Final central directory */
217 int entriesZip = entries;
219 char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
220 int comsize = (int) strlen(comment);
221 if (entriesZip > 0xffff) {
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 */
234 if (fwrite(header, 1, 22, fpOutCD) == 22) {
238 if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
248 /* Final merge (file + central directory) */
251 fpOutCD = fopen(fileOutTmp, "rb");
252 if (fpOutCD != NULL) {
255 while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
256 if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
269 /* Wipe temporary file */
270 (void)remove(fileOutTmp);
272 /* Number of recovered entries */
274 if (nRecovered != NULL) {
275 *nRecovered = entries;
277 if (bytesRecovered != NULL) {
278 *bytesRecovered = totalBytes;
282 err = Z_STREAM_ERROR;