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(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
33 const char* fileOutTmp;
35 uLong* bytesRecovered;
38 FILE* fpZip = fopen(file, "rb");
39 FILE* fpOut = fopen(fileOut, "wb");
40 FILE* fpOutCD = fopen(fileOutTmp, "wb");
41 if (fpZip != NULL && fpOut != NULL) {
49 while ( fread(header, 1, 30, fpZip) == 30 ) {
50 int currentOffset = offset;
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';
67 if (fwrite(header, 1, 30, fpOut) == 30) {
76 if (fnsize < sizeof(filename)) {
77 if (fread(filename, 1, fnsize, fpZip) == fnsize) {
78 if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
99 if (extsize < sizeof(extra)) {
100 if (fread(extra, 1, extsize, fpZip) == extsize) {
101 if (fwrite(extra, 1, extsize, fpOut) == extsize) {
119 int dataSize = cpsize;
124 char* data = malloc(dataSize);
126 if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
127 if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
129 totalBytes += dataSize;
147 /* Central directory entry */
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);
170 if (fwrite(header, 1, 46, fpOutCD) == 46) {
175 if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
182 err = Z_STREAM_ERROR;
188 if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
198 if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
221 /* Final central directory */
223 int entriesZip = entries;
225 char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
226 int comsize = (int) strlen(comment);
227 if (entriesZip > 0xffff) {
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 */
240 if (fwrite(header, 1, 22, fpOutCD) == 22) {
244 if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
254 /* Final merge (file + central directory) */
257 fpOutCD = fopen(fileOutTmp, "rb");
258 if (fpOutCD != NULL) {
261 while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
262 if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
275 /* Wipe temporary file */
276 (void)remove(fileOutTmp);
278 /* Number of recovered entries */
280 if (nRecovered != NULL) {
281 *nRecovered = entries;
283 if (bytesRecovered != NULL) {
284 *bytesRecovered = totalBytes;
288 err = Z_STREAM_ERROR;