macbin3.c

压缩解压,是unzip540的升级,这个外国网站摘来的源码,是evb编写.

/****************************************************************
    MacBinaryIII.c

    Copyright  1997 Christopher Evans ([e-mail])

    Basic encoding and decoding of Macintosh files to the
    MacBinary III spec.

 This file is part of the MacBinaryIII_src_C.sit package
 see macbin3.h for more information

****************************************************************/

/*****************************************************************************/
/*  Includes                                                                 */
/*****************************************************************************/

#include <string.h>
#include <stdio.h>
#include "macbin3.h"

/*****************************************************************************/
/*  Macros, typedefs                                                         */
/*****************************************************************************/

/* source (the macbinary file) will be deleted */
#define DELETE_MACBINARY_SOURCE

/* enable encoding
#define INCLUDE_ENCODE_MACBINARY         */

/* enable decoding */
#define INCLUDE_DECODE_MACBINARY

/* include own CRC 32 Bit Calculation
#define INCLUDE_CRC32CALC               */

/* produce some helpful printouts for tracing
#define TRACE_MACBINARY   */



#define LONG_AT_OFFSET(data, offset) *((long *)((unsigned char *)&data[offset]))
#define WORD_AT_OFFSET(data, offset) *((Word *)((unsigned char *)&data[offset]))
#define BYTE_AT_OFFSET(data, offset) *((Byte *)((unsigned char *)&data[offset]))
#define PTR_AT_OFFSET(data, offset)  ((Ptr)((unsigned char *)&data[offset]))

typedef     unsigned short      Word;

#define kOldVersionOffset               0
#define kFileNameLengthOffset           1
#define kFileNameOffset                 2
#define kFileTypeOffset                 65
#define kFileCreatorOffset              69
#define kFinderFlagsHiOffset            73
#define kVersionCheckZero               74
#define kFileVPositionOffset            75
#define kFileHPositionOffset            77
#define kFileFolderIDOffset             79
#define kProtectedFlagOffset            81
#define kVersionOneCheckZero            82
#define kDataForkLengthOffset           83
#define kResourceForkLengthOffset       87
#define kFileCreationDateOffset         91
#define kFileModificationDateOffset     95
#define kGetInfoCommentLengthOffset     99
#define kFinderFlagsLowOffset           101
#define kMacbinarySigOffset             102
#define kFilenameScriptOffset           106
#define kExtendedFinderFlagsOffset      107
#define kTotalFileLengthOffset          116
#define kSecondaryHeaderLengthOffset    120
#define kCurrentVersionOffset           122
#define kMinimumVersionOffset           123
#define kCRCOffset                      124

#define kResourceForkMaxLen             (1024 * 1024 * 16)


/*****************************************************************************/
/*  Module level Vars                                                        */
/*****************************************************************************/

#ifdef INCLUDE_CRC32CALC
static unsigned long crc_table[256] = {
  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  0x2d02ef8dL
};
#endif


/*****************************************************************************/
/*  Prototypes                                                               */
/*****************************************************************************/

static Boolean  HeaderIsMacBinary(char *header,
                                  Word *version,
                                  long maxDataLen);
static Boolean FSpExists(FSSpec *file);
#ifdef INCLUDE_CRC32CALC
static unsigned long crc32(unsigned long seed, unsigned char *p, size_t len);
#else
extern unsigned long crc32(unsigned long seed, unsigned char *p, size_t len);
#endif
static OSErr GetDesktopComment(FSSpec *file, char*comment, long *length);
static OSErr SetDesktopComment(FSSpec *file, char*comment, long length);
static Handle  EncodeMacbinary(FSSpec *file);
static OSErr   DecodeMacBinary(Handle data, FSSpec *destination);

/*****************************************************************************/
/*  Functions                                                                */
/*****************************************************************************/


#ifdef INCLUDE_CRC32CALC
/* taken from the mcvert source code */
static unsigned long crc32(unsigned long seed, unsigned char *p, size_t len)
{
    unsigned long hold;     /* crc computed so far */
    size_t i;               /* index into data */

    hold = seed;                   /* start with seed */
    for (i = 0; i < len; i++, p++)
        {
        hold ^= (*p << 8);
        hold  = (hold << 8) ^ crc_table[(unsigned char) (hold >> 8)];
        }

    return (hold);
}               /* crc32() */
#endif



static Boolean FSpExists(FSSpec *file)
{
    FInfo   fndrInfo;

    return FSpGetFInfo(file, &fndrInfo) == noErr;
}


static Boolean  HeaderIsMacBinary(char *header,
                                  Word *version,
                                  long maxDataLen)
{
    Boolean isIt = false;
    unsigned long resourceForkLength, dataForkLength, df_rf_length;
    short commentLength;
    Byte    mbVersion;

#ifdef TRACE_MACBINARY
printf("\n\n Function HeaderIsMacBinary(): ");
#endif

    if(LONG_AT_OFFSET(header, kMacbinarySigOffset) == 'mBIN')
        {
        isIt = true;
        mbVersion = 130;
        }
    else
        if(BYTE_AT_OFFSET(header, kVersionCheckZero) == 0 &&
            BYTE_AT_OFFSET(header, kOldVersionOffset) == 0)
            {
            if(WORD_AT_OFFSET(header, kCRCOffset) ==
               crc32(0, (unsigned char*) &header, 124))
                {
                isIt = true;
                mbVersion = 129;
                }
            else
                {
                if(BYTE_AT_OFFSET(header, kVersionOneCheckZero) == 0)
                    {
                    isIt = true;
                    mbVersion = 128;
                    }
                }
            }

#ifdef TRACE_MACBINARY
printf("\n           mbVersion: %d",mbVersion);
#endif

    resourceForkLength = LONG_AT_OFFSET(header, kResourceForkLengthOffset);
    dataForkLength     = LONG_AT_OFFSET(header, kDataForkLengthOffset);
    commentLength      = WORD_AT_OFFSET(header, kGetInfoCommentLengthOffset);
    df_rf_length = dataForkLength + resourceForkLength;

#ifdef TRACE_MACBINARY
printf("\n  resourceForkLength: %d",resourceForkLength);
printf("\n      dataForkLength: %d",dataForkLength);
printf("\n       commentLength: %d",commentLength);
printf("\n        df_rf_length: %d",df_rf_length);
printf("\n                                                 1. isIt: bool: %d",
       isIt);
printf("\n BYTE_AT_OFFSET(header, kFileNameLengthOffset) >= 1       bool: %d",
       BYTE_AT_OFFSET(header, kFileNameLengthOffset) >= 1);
printf("\n BYTE_AT_OFFSET(header, kFileNameLengthOffset) <= 31      bool: %d",
       BYTE_AT_OFFSET(header, kFileNameLengthOffset) <= 31);
printf("\n dataForkLength >= 0                                      bool: %d",
       dataForkLength >= 0);
printf("\n resourceForkLength >= 0                                  bool: %d",
       resourceForkLength >= 0);
printf("\n resourceForkLength <= 0x%8x                         bool: %d",
       kResourceForkMaxLen, resourceForkLength <= kResourceForkMaxLen);
printf("\n dataForkLength     <= %8u                           bool: %d",
       maxDataLen, dataForkLength <= maxDataLen);
printf("\n df_rf_length        > 0                                  bool: %d",
       df_rf_length > 0);
printf("\n df_rf_length       <= %8u                           bool: %d",
       maxDataLen, df_rf_length <= maxDataLen);
#endif

    if(isIt                                                &&
       BYTE_AT_OFFSET(header, kFileNameLengthOffset) >=  1 &&
       BYTE_AT_OFFSET(header, kFileNameLengthOffset) <= 31 &&
       dataForkLength     >= 0                             &&
       resourceForkLength >= 0                             &&
       resourceForkLength <= kResourceForkMaxLen           &&
       df_rf_length       > 0                              &&
       df_rf_length       <= maxDataLen)
        {
        isIt = true;
        }
    else
        isIt = false;   /* something is wrong with the header */

#ifdef TRACE_MACBINARY
printf("\n                                                 2. isIt: bool: %d",
       isIt);
#endif

    if(version)
        *version = mbVersion;
    return isIt;
}



Boolean FSpIsMacBinary(FSSpec *file)
{
    char header[128];
    short dfRefNum = 0;
    OSErr   err;
    long    size;
    Boolean isIt = false;
    CInfoPBRec  pb;
    long maxDataLen;

    memset(&pb, 0, sizeof(CInfoPBRec));
    pb.hFileInfo.ioNamePtr   = file->name;
    pb.hFileInfo.ioVRefNum   = file->vRefNum;
    pb.hFileInfo.ioFDirIndex = 0;           /*  query a file */
    pb.hFileInfo.ioDirID     = file->parID;
    err = PBGetCatInfo(&pb,false);
    maxDataLen = pb.hFileInfo.ioFlLgLen;

    memset(header, 0, 128);

    err = FSpOpenDF(file, fsRdPerm, &dfRefNum);
    if(!err)
        {
        err = GetEOF(dfRefNum, &size);
        if(size > 128)
            {
            size = 128;
            err = FSRead(dfRefNum, &size, &header);

            if(err == noErr)
                {
                isIt = HeaderIsMacBinary(header, nil, maxDataLen);
                }
            }
        FSClose(dfRefNum);
        }
    return isIt;
}



#ifdef INCLUDE_ENCODE_MACBINARY

static OSErr    GetDesktopComment(FSSpec *file, char*comment, long *length)
{
    DTPBRec     pb;
    OSErr       err;

    pb.ioCompletion = nil;
    pb.ioNamePtr = NULL;
    pb.ioVRefNum = file->vRefNum;

    err = PBDTGetPath(&pb);

    if(err == noErr)
        {
        pb.ioNamePtr = file->name;
        pb.ioDTBuffer = comment;
        pb.ioDirID = file->parID;
        err = PBDTGetComment(&pb, false);
        *length = pb.ioDTActCount;
        }
    return err;
}




OSErr   EncodeMacbinaryFile(FSSpec *file)
{
    Handle data;
    OSErr   err = paramErr;
    short   dfRefNum;

    data = EncodeMacbinary(file);

    if(data)
        {
        if(file->name[0] > 27)
            file->name[0] = 27;

        PtoCstr(file->name);
        strcat((char*)file->name, ".bin");
        CtoPstr((char *)file->name);

        FSpDelete(file);
        if(FSpCreate(file, 'dMB3', 'mBIN', smSystemScript) == noErr)
            {
            err = FSpOpenDF(file, fsWrPerm, &dfRefNum);
            if(err == noErr)
                {
                long    inOutCount = GetHandleSize(data);