usbloadergx/source/unzip/mztools.c

/*
 Additional tools for Minizip
 Code: Xavier Roche '2004
 License: Same as ZLIB (www.gzip.org)
 */

/* Code */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zlib.h"
#include "unzip.h"

#define READ_8(adr)  ((unsigned char)*(adr))
#define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) )
#define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) )

#define WRITE_8(buff, n) do { \
  *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \
} while(0)
#define WRITE_16(buff, n) do { \
  WRITE_8((unsigned char*)(buff), n); \
  WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \
} while(0)
#define WRITE_32(buff, n) do { \
  WRITE_16((unsigned char*)(buff), (n) & 0xffff); \
  WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \
} while(0)

extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
    const char* file;const char* fileOut;const char* fileOutTmp;uLong* nRecovered;uLong* bytesRecovered;
{
    int err = Z_OK;
    FILE* fpZip = fopen(file, "rb");
    FILE* fpOut = fopen(fileOut, "wb");
    FILE* fpOutCD = fopen(fileOutTmp, "wb");
    if (fpZip != NULL && fpOut != NULL)
    {
        int entries = 0;
        uLong totalBytes = 0;
        char header[30];
        char filename[256];
        char extra[1024];
        int offset = 0;
        int offsetCD = 0;
        while (fread(header, 1, 30, fpZip) == 30)
        {
            int currentOffset = offset;

            /* File entry */
            if (READ_32( header ) == 0x04034b50)
            {
                unsigned int version = READ_16( header + 4 );
                unsigned int gpflag = READ_16( header + 6 );
                unsigned int method = READ_16( header + 8 );
                unsigned int filetime = READ_16( header + 10 );
                unsigned int filedate = READ_16( header + 12 );
                unsigned int crc = READ_32( header + 14 ); /* crc */
                unsigned int cpsize = READ_32( header + 18 ); /* compressed size */
                unsigned int uncpsize = READ_32( header + 22 ); /* uncompressed sz */
                unsigned int fnsize = READ_16( header + 26 ); /* file name length */
                unsigned int extsize = READ_16( header + 28 ); /* extra field length */
                filename[0] = extra[0] = '\0';

                /* Header */
                if (fwrite(header, 1, 30, fpOut) == 30)
                {
                    offset += 30;
                }
                else
                {
                    err = Z_ERRNO;
                    break;
                }

                /* Filename */
                if (fnsize > 0)
                {
                    if (fread(filename, 1, fnsize, fpZip) == fnsize)
                    {
                        if (fwrite(filename, 1, fnsize, fpOut) == fnsize)
                        {
                            offset += fnsize;
                        }
                        else
                        {
                            err = Z_ERRNO;
                            break;
                        }
                    }
                    else
                    {
                        err = Z_ERRNO;
                        break;
                    }
                }
                else
                {
                    err = Z_STREAM_ERROR;
                    break;
                }

                /* Extra field */
                if (extsize > 0)
                {
                    if (fread(extra, 1, extsize, fpZip) == extsize)
                    {
                        if (fwrite(extra, 1, extsize, fpOut) == extsize)
                        {
                            offset += extsize;
                        }
                        else
                        {
                            err = Z_ERRNO;
                            break;
                        }
                    }
                    else
                    {
                        err = Z_ERRNO;
                        break;
                    }
                }

                /* Data */
                {
                    int dataSize = cpsize;
                    if (dataSize == 0)
                    {
                        dataSize = uncpsize;
                    }
                    if (dataSize > 0)
                    {
                        char* data = malloc(dataSize);
                        if (data != NULL)
                        {
                            if ((int) fread(data, 1, dataSize, fpZip) == dataSize)
                            {
                                if ((int) fwrite(data, 1, dataSize, fpOut) == dataSize)
                                {
                                    offset += dataSize;
                                    totalBytes += dataSize;
                                }
                                else
                                {
                                    err = Z_ERRNO;
                                }
                            }
                            else
                            {
                                err = Z_ERRNO;
                            }
                            free(data);
                            if (err != Z_OK)
                            {
                                break;
                            }
                        }
                        else
                        {
                            err = Z_MEM_ERROR;
                            break;
                        }
                    }
                }

                /* Central directory entry */
                {
                    char header[46];
                    char* comment = "";
                    int comsize = (int) strlen(comment);
                    WRITE_32( header, 0x02014b50 );
                    WRITE_16( header + 4, version );
                    WRITE_16( header + 6, version );
                    WRITE_16( header + 8, gpflag );
                    WRITE_16( header + 10, method );
                    WRITE_16( header + 12, filetime );
                    WRITE_16( header + 14, filedate );
                    WRITE_32( header + 16, crc );
                    WRITE_32( header + 20, cpsize );
                    WRITE_32( header + 24, uncpsize );
                    WRITE_16( header + 28, fnsize );
                    WRITE_16( header + 30, extsize );
                    WRITE_16( header + 32, comsize );
                    WRITE_16( header + 34, 0 ); /* disk # */
                    WRITE_16( header + 36, 0 ); /* int attrb */
                    WRITE_32( header + 38, 0 ); /* ext attrb */
                    WRITE_32( header + 42, currentOffset );
                    /* Header */
                    if (fwrite(header, 1, 46, fpOutCD) == 46)
                    {
                        offsetCD += 46;

                        /* Filename */
                        if (fnsize > 0)
                        {
                            if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize)
                            {
                                offsetCD += fnsize;
                            }
                            else
                            {
                                err = Z_ERRNO;
                                break;
                            }
                        }
                        else
                        {
                            err = Z_STREAM_ERROR;
                            break;
                        }

                        /* Extra field */
                        if (extsize > 0)
                        {
                            if (fwrite(extra, 1, extsize, fpOutCD) == extsize)
                            {
                                offsetCD += extsize;
                            }
                            else
                            {
                                err = Z_ERRNO;
                                break;
                            }
                        }

                        /* Comment field */
                        if (comsize > 0)
                        {
                            if ((int) fwrite(comment, 1, comsize, fpOutCD) == comsize)
                            {
                                offsetCD += comsize;
                            }
                            else
                            {
                                err = Z_ERRNO;
                                break;
                            }
                        }

                    }
                    else
                    {
                        err = Z_ERRNO;
                        break;
                    }
                }

                /* Success */
                entries++;

            }
            else
            {
                break;
            }
        }

        /* Final central directory  */
        {
            int entriesZip = entries;
            char header[22];
            char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
            int comsize = (int) strlen(comment);
            if (entriesZip > 0xffff)
            {
                entriesZip = 0xffff;
            }
            WRITE_32( header, 0x06054b50 );
            WRITE_16( header + 4, 0 ); /* disk # */
            WRITE_16( header + 6, 0 ); /* disk # */
            WRITE_16( header + 8, entriesZip ); /* hack */
            WRITE_16( header + 10, entriesZip ); /* hack */
            WRITE_32( header + 12, offsetCD ); /* size of CD */
            WRITE_32( header + 16, offset ); /* offset to CD */
            WRITE_16( header + 20, comsize ); /* comment */

            /* Header */
            if (fwrite(header, 1, 22, fpOutCD) == 22)
            {

                /* Comment field */
                if (comsize > 0)
                {
                    if ((int) fwrite(comment, 1, comsize, fpOutCD) != comsize)
                    {
                        err = Z_ERRNO;
                    }
                }

            }
            else
            {
                err = Z_ERRNO;
            }
        }

        /* Final merge (file + central directory) */
        fclose(fpOutCD);
        if (err == Z_OK)
        {
            fpOutCD = fopen(fileOutTmp, "rb");
            if (fpOutCD != NULL)
            {
                int nRead;
                char buffer[8192];
                while ((nRead = (int) fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0)
                {
                    if ((int) fwrite(buffer, 1, nRead, fpOut) != nRead)
                    {
                        err = Z_ERRNO;
                        break;
                    }
                }
                fclose(fpOutCD);
            }
        }

        /* Close */
        fclose(fpZip);
        fclose(fpOut);

        /* Wipe temporary file */
        (void) remove(fileOutTmp);

        /* Number of recovered entries */
        if (err == Z_OK)
        {
            if (nRecovered != NULL)
            {
                *nRecovered = entries;
            }
            if (bytesRecovered != NULL)
            {
                *bytesRecovered = totalBytes;
            }
        }
    }
    else
    {
        err = Z_STREAM_ERROR;
    }
    return err;
}