Chris@4: /*
Chris@4:   Additional tools for Minizip
Chris@4:   Code: Xavier Roche '2004
Chris@4:   License: Same as ZLIB (www.gzip.org)
Chris@4: */
Chris@4: 
Chris@4: /* Code */
Chris@4: #include <stdio.h>
Chris@4: #include <stdlib.h>
Chris@4: #include <string.h>
Chris@4: #include "zlib.h"
Chris@4: #include "unzip.h"
Chris@4: 
Chris@4: #define READ_8(adr)  ((unsigned char)*(adr))
Chris@4: #define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) )
Chris@4: #define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) )
Chris@4: 
Chris@4: #define WRITE_8(buff, n) do { \
Chris@4:   *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \
Chris@4: } while(0)
Chris@4: #define WRITE_16(buff, n) do { \
Chris@4:   WRITE_8((unsigned char*)(buff), n); \
Chris@4:   WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \
Chris@4: } while(0)
Chris@4: #define WRITE_32(buff, n) do { \
Chris@4:   WRITE_16((unsigned char*)(buff), (n) & 0xffff); \
Chris@4:   WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \
Chris@4: } while(0)
Chris@4: 
Chris@4: extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
Chris@4: const char* file;
Chris@4: const char* fileOut;
Chris@4: const char* fileOutTmp;
Chris@4: uLong* nRecovered;
Chris@4: uLong* bytesRecovered;
Chris@4: {
Chris@4:   int err = Z_OK;
Chris@4:   FILE* fpZip = fopen(file, "rb");
Chris@4:   FILE* fpOut = fopen(fileOut, "wb");
Chris@4:   FILE* fpOutCD = fopen(fileOutTmp, "wb");
Chris@4:   if (fpZip != NULL &&  fpOut != NULL) {
Chris@4:     int entries = 0;
Chris@4:     uLong totalBytes = 0;
Chris@4:     char header[30];
Chris@4:     char filename[1024];
Chris@4:     char extra[1024];
Chris@4:     int offset = 0;
Chris@4:     int offsetCD = 0;
Chris@4:     while ( fread(header, 1, 30, fpZip) == 30 ) {
Chris@4:       int currentOffset = offset;
Chris@4: 
Chris@4:       /* File entry */
Chris@4:       if (READ_32(header) == 0x04034b50) {
Chris@4:         unsigned int version = READ_16(header + 4);
Chris@4:         unsigned int gpflag = READ_16(header + 6);
Chris@4:         unsigned int method = READ_16(header + 8);
Chris@4:         unsigned int filetime = READ_16(header + 10);
Chris@4:         unsigned int filedate = READ_16(header + 12);
Chris@4:         unsigned int crc = READ_32(header + 14); /* crc */
Chris@4:         unsigned int cpsize = READ_32(header + 18); /* compressed size */
Chris@4:         unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */
Chris@4:         unsigned int fnsize = READ_16(header + 26); /* file name length */
Chris@4:         unsigned int extsize = READ_16(header + 28); /* extra field length */
Chris@4:         filename[0] = extra[0] = '\0';
Chris@4: 
Chris@4:         /* Header */
Chris@4:         if (fwrite(header, 1, 30, fpOut) == 30) {
Chris@4:           offset += 30;
Chris@4:         } else {
Chris@4:           err = Z_ERRNO;
Chris@4:           break;
Chris@4:         }
Chris@4: 
Chris@4:         /* Filename */
Chris@4:         if (fnsize > 0) {
Chris@4:           if (fnsize < sizeof(filename)) {
Chris@4:             if (fread(filename, 1, fnsize, fpZip) == fnsize) {
Chris@4:                 if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
Chris@4:                 offset += fnsize;
Chris@4:               } else {
Chris@4:                 err = Z_ERRNO;
Chris@4:                 break;
Chris@4:               }
Chris@4:             } else {
Chris@4:               err = Z_ERRNO;
Chris@4:               break;
Chris@4:             }
Chris@4:           } else {
Chris@4:             err = Z_ERRNO;
Chris@4:             break;
Chris@4:           }
Chris@4:         } else {
Chris@4:           err = Z_STREAM_ERROR;
Chris@4:           break;
Chris@4:         }
Chris@4: 
Chris@4:         /* Extra field */
Chris@4:         if (extsize > 0) {
Chris@4:           if (extsize < sizeof(extra)) {
Chris@4:             if (fread(extra, 1, extsize, fpZip) == extsize) {
Chris@4:               if (fwrite(extra, 1, extsize, fpOut) == extsize) {
Chris@4:                 offset += extsize;
Chris@4:                 } else {
Chris@4:                 err = Z_ERRNO;
Chris@4:                 break;
Chris@4:               }
Chris@4:             } else {
Chris@4:               err = Z_ERRNO;
Chris@4:               break;
Chris@4:             }
Chris@4:           } else {
Chris@4:             err = Z_ERRNO;
Chris@4:             break;
Chris@4:           }
Chris@4:         }
Chris@4: 
Chris@4:         /* Data */
Chris@4:         {
Chris@4:           int dataSize = cpsize;
Chris@4:           if (dataSize == 0) {
Chris@4:             dataSize = uncpsize;
Chris@4:           }
Chris@4:           if (dataSize > 0) {
Chris@4:             char* data = malloc(dataSize);
Chris@4:             if (data != NULL) {
Chris@4:               if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
Chris@4:                 if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
Chris@4:                   offset += dataSize;
Chris@4:                   totalBytes += dataSize;
Chris@4:                 } else {
Chris@4:                   err = Z_ERRNO;
Chris@4:                 }
Chris@4:               } else {
Chris@4:                 err = Z_ERRNO;
Chris@4:               }
Chris@4:               free(data);
Chris@4:               if (err != Z_OK) {
Chris@4:                 break;
Chris@4:               }
Chris@4:             } else {
Chris@4:               err = Z_MEM_ERROR;
Chris@4:               break;
Chris@4:             }
Chris@4:           }
Chris@4:         }
Chris@4: 
Chris@4:         /* Central directory entry */
Chris@4:         {
Chris@4:           char header[46];
Chris@4:           char* comment = "";
Chris@4:           int comsize = (int) strlen(comment);
Chris@4:           WRITE_32(header, 0x02014b50);
Chris@4:           WRITE_16(header + 4, version);
Chris@4:           WRITE_16(header + 6, version);
Chris@4:           WRITE_16(header + 8, gpflag);
Chris@4:           WRITE_16(header + 10, method);
Chris@4:           WRITE_16(header + 12, filetime);
Chris@4:           WRITE_16(header + 14, filedate);
Chris@4:           WRITE_32(header + 16, crc);
Chris@4:           WRITE_32(header + 20, cpsize);
Chris@4:           WRITE_32(header + 24, uncpsize);
Chris@4:           WRITE_16(header + 28, fnsize);
Chris@4:           WRITE_16(header + 30, extsize);
Chris@4:           WRITE_16(header + 32, comsize);
Chris@4:           WRITE_16(header + 34, 0);     /* disk # */
Chris@4:           WRITE_16(header + 36, 0);     /* int attrb */
Chris@4:           WRITE_32(header + 38, 0);     /* ext attrb */
Chris@4:           WRITE_32(header + 42, currentOffset);
Chris@4:           /* Header */
Chris@4:           if (fwrite(header, 1, 46, fpOutCD) == 46) {
Chris@4:             offsetCD += 46;
Chris@4: 
Chris@4:             /* Filename */
Chris@4:             if (fnsize > 0) {
Chris@4:               if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
Chris@4:                 offsetCD += fnsize;
Chris@4:               } else {
Chris@4:                 err = Z_ERRNO;
Chris@4:                 break;
Chris@4:               }
Chris@4:             } else {
Chris@4:               err = Z_STREAM_ERROR;
Chris@4:               break;
Chris@4:             }
Chris@4: 
Chris@4:             /* Extra field */
Chris@4:             if (extsize > 0) {
Chris@4:               if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
Chris@4:                 offsetCD += extsize;
Chris@4:               } else {
Chris@4:                 err = Z_ERRNO;
Chris@4:                 break;
Chris@4:               }
Chris@4:             }
Chris@4: 
Chris@4:             /* Comment field */
Chris@4:             if (comsize > 0) {
Chris@4:               if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
Chris@4:                 offsetCD += comsize;
Chris@4:               } else {
Chris@4:                 err = Z_ERRNO;
Chris@4:                 break;
Chris@4:               }
Chris@4:             }
Chris@4: 
Chris@4: 
Chris@4:           } else {
Chris@4:             err = Z_ERRNO;
Chris@4:             break;
Chris@4:           }
Chris@4:         }
Chris@4: 
Chris@4:         /* Success */
Chris@4:         entries++;
Chris@4: 
Chris@4:       } else {
Chris@4:         break;
Chris@4:       }
Chris@4:     }
Chris@4: 
Chris@4:     /* Final central directory  */
Chris@4:     {
Chris@4:       int entriesZip = entries;
Chris@4:       char header[22];
Chris@4:       char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
Chris@4:       int comsize = (int) strlen(comment);
Chris@4:       if (entriesZip > 0xffff) {
Chris@4:         entriesZip = 0xffff;
Chris@4:       }
Chris@4:       WRITE_32(header, 0x06054b50);
Chris@4:       WRITE_16(header + 4, 0);    /* disk # */
Chris@4:       WRITE_16(header + 6, 0);    /* disk # */
Chris@4:       WRITE_16(header + 8, entriesZip);   /* hack */
Chris@4:       WRITE_16(header + 10, entriesZip);  /* hack */
Chris@4:       WRITE_32(header + 12, offsetCD);    /* size of CD */
Chris@4:       WRITE_32(header + 16, offset);      /* offset to CD */
Chris@4:       WRITE_16(header + 20, comsize);     /* comment */
Chris@4: 
Chris@4:       /* Header */
Chris@4:       if (fwrite(header, 1, 22, fpOutCD) == 22) {
Chris@4: 
Chris@4:         /* Comment field */
Chris@4:         if (comsize > 0) {
Chris@4:           if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
Chris@4:             err = Z_ERRNO;
Chris@4:           }
Chris@4:         }
Chris@4: 
Chris@4:       } else {
Chris@4:         err = Z_ERRNO;
Chris@4:       }
Chris@4:     }
Chris@4: 
Chris@4:     /* Final merge (file + central directory) */
Chris@4:     fclose(fpOutCD);
Chris@4:     if (err == Z_OK) {
Chris@4:       fpOutCD = fopen(fileOutTmp, "rb");
Chris@4:       if (fpOutCD != NULL) {
Chris@4:         int nRead;
Chris@4:         char buffer[8192];
Chris@4:         while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
Chris@4:           if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
Chris@4:             err = Z_ERRNO;
Chris@4:             break;
Chris@4:           }
Chris@4:         }
Chris@4:         fclose(fpOutCD);
Chris@4:       }
Chris@4:     }
Chris@4: 
Chris@4:     /* Close */
Chris@4:     fclose(fpZip);
Chris@4:     fclose(fpOut);
Chris@4: 
Chris@4:     /* Wipe temporary file */
Chris@4:     (void)remove(fileOutTmp);
Chris@4: 
Chris@4:     /* Number of recovered entries */
Chris@4:     if (err == Z_OK) {
Chris@4:       if (nRecovered != NULL) {
Chris@4:         *nRecovered = entries;
Chris@4:       }
Chris@4:       if (bytesRecovered != NULL) {
Chris@4:         *bytesRecovered = totalBytes;
Chris@4:       }
Chris@4:     }
Chris@4:   } else {
Chris@4:     err = Z_STREAM_ERROR;
Chris@4:   }
Chris@4:   return err;
Chris@4: }