unzip.c

psp上的reader 这个是以月光老大的cnreader为基础 增加了zip文件浏览功能

extern unzFile ZEXPORT unzOpen2 (path, pzlib_filefunc_def)
    const char *path;
    zlib_filefunc_def* pzlib_filefunc_def;
{
    unz_s us;
    unz_s *s;
    uLong central_pos,uL;

    uLong number_disk;          /* number of the current dist, used for
                                   spaning ZIP, unsupported, always 0*/
    uLong number_disk_with_CD;  /* number the the disk with central dir, used
                                   for spaning ZIP, unsupported, always 0*/
    uLong number_entry_CD;      /* total number of entries in
                                   the central dir
                                   (same than number_entry on nospan) */

    int err=UNZ_OK;

    if (unz_copyright[0]!=' ')
        return NULL;

    if (pzlib_filefunc_def==NULL)
        fill_fopen_filefunc(&us.z_filefunc);
    else
        us.z_filefunc = *pzlib_filefunc_def;

    us.filestream= (*(us.z_filefunc.zopen_file))(us.z_filefunc.opaque,
                                                 path,
                                                 ZLIB_FILEFUNC_MODE_READ |
                                                 ZLIB_FILEFUNC_MODE_EXISTING);
    if (us.filestream==NULL)
        return NULL;

    central_pos = unzlocal_SearchCentralDir(&us.z_filefunc,us.filestream);
    if (central_pos==0)
        err=UNZ_ERRNO;

    if (ZSEEK(us.z_filefunc, us.filestream,
                                      central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
        err=UNZ_ERRNO;

    /* the signature, already checked */
    if (unzlocal_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
        err=UNZ_ERRNO;

    /* number of this disk */
    if (unzlocal_getShort(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
        err=UNZ_ERRNO;

    /* number of the disk with the start of the central directory */
    if (unzlocal_getShort(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
        err=UNZ_ERRNO;

    /* total number of entries in the central dir on this disk */
    if (unzlocal_getShort(&us.z_filefunc, us.filestream,&us.gi.number_entry)!=UNZ_OK)
        err=UNZ_ERRNO;

    /* total number of entries in the central dir */
    if (unzlocal_getShort(&us.z_filefunc, us.filestream,&number_entry_CD)!=UNZ_OK)
        err=UNZ_ERRNO;

    if ((number_entry_CD!=us.gi.number_entry) ||
        (number_disk_with_CD!=0) ||
        (number_disk!=0))
        err=UNZ_BADZIPFILE;

    /* size of the central directory */
    if (unzlocal_getLong(&us.z_filefunc, us.filestream,&us.size_central_dir)!=UNZ_OK)
        err=UNZ_ERRNO;

    /* offset of start of central directory with respect to the
          starting disk number */
    if (unzlocal_getLong(&us.z_filefunc, us.filestream,&us.offset_central_dir)!=UNZ_OK)
        err=UNZ_ERRNO;

    /* zipfile comment length */
    if (unzlocal_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK)
        err=UNZ_ERRNO;

    if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
        (err==UNZ_OK))
        err=UNZ_BADZIPFILE;
    if (err!=UNZ_OK)
    {
        ZCLOSE(us.z_filefunc, us.filestream);
        return NULL;
    }

    us.byte_before_the_zipfile = central_pos -
                            (us.offset_central_dir+us.size_central_dir);
    us.central_pos = central_pos;
    us.pfile_in_zip_read = NULL;
    us.encrypted = 0;


    s=(unz_s*)ALLOC(sizeof(unz_s));
    *s=us;
    unzGoToFirstFile((unzFile)s);
    return (unzFile)s;
}


extern unzFile ZEXPORT unzOpen (path)
    const char *path;
{
    return unzOpen2(path, NULL);
}

/*
  Close a ZipFile opened with unzipOpen.
  If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),
    these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
  return UNZ_OK if there is no problem. */
extern int ZEXPORT unzClose (file)
    unzFile file;
{
    unz_s* s;
    if (file==NULL)
        return UNZ_PARAMERROR;
    s=(unz_s*)file;

    if (s->pfile_in_zip_read!=NULL)
        unzCloseCurrentFile(file);

    ZCLOSE(s->z_filefunc, s->filestream);
    TRYFREE(s);
    return UNZ_OK;
}


/*
  Write info about the ZipFile in the *pglobal_info structure.
  No preparation of the structure is needed
  return UNZ_OK if there is no problem. */
extern int ZEXPORT unzGetGlobalInfo (file,pglobal_info)
    unzFile file;
    unz_global_info *pglobal_info;
{
    unz_s* s;
    if (file==NULL)
        return UNZ_PARAMERROR;
    s=(unz_s*)file;
    *pglobal_info=s->gi;
    return UNZ_OK;
}


/*
   Translate date/time from Dos format to tm_unz (readable more easilty)
*/
local void unzlocal_DosDateToTmuDate (ulDosDate, ptm)
    uLong ulDosDate;
    tm_unz* ptm;
{
    uLong uDate;
    uDate = (uLong)(ulDosDate>>16);
    ptm->tm_mday = (uInt)(uDate&0x1f) ;
    ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;
    ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;

    ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
    ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;
    ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;
}

/*
  Get Info about the current file in the zipfile, with internal only info
*/
local int unzlocal_GetCurrentFileInfoInternal OF((unzFile file,
                                                  unz_file_info *pfile_info,
                                                  unz_file_info_internal
                                                  *pfile_info_internal,
                                                  char *szFileName,
                                                  uLong fileNameBufferSize,
                                                  void *extraField,
                                                  uLong extraFieldBufferSize,
                                                  char *szComment,
                                                  uLong commentBufferSize));

local int unzlocal_GetCurrentFileInfoInternal (file,
                                              pfile_info,
                                              pfile_info_internal,
                                              szFileName, fileNameBufferSize,
                                              extraField, extraFieldBufferSize,
                                              szComment,  commentBufferSize)
    unzFile file;
    unz_file_info *pfile_info;
    unz_file_info_internal *pfile_info_internal;
    char *szFileName;
    uLong fileNameBufferSize;
    void *extraField;
    uLong extraFieldBufferSize;
    char *szComment;
    uLong commentBufferSize;
{
    unz_s* s;
    unz_file_info file_info;
    unz_file_info_internal file_info_internal;
    int err=UNZ_OK;
    uLong uMagic;
    long lSeek=0;

    if (file==NULL)
        return UNZ_PARAMERROR;
    s=(unz_s*)file;
    if (ZSEEK(s->z_filefunc, s->filestream,
              s->pos_in_central_dir+s->byte_before_the_zipfile,
              ZLIB_FILEFUNC_SEEK_SET)!=0)
        err=UNZ_ERRNO;


    /* we check the magic */
    if (err==UNZ_OK)
        if (unzlocal_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK)
            err=UNZ_ERRNO;
        else if (uMagic!=0x02014b50)
            err=UNZ_BADZIPFILE;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.version) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.version_needed) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.flag) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.compression_method) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.dosDate) != UNZ_OK)
        err=UNZ_ERRNO;

    unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);

    if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.crc) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.compressed_size) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.uncompressed_size) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.size_filename) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_extra) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_comment) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.disk_num_start) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.internal_fa) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.external_fa) != UNZ_OK)
        err=UNZ_ERRNO;

    if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info_internal.offset_curfile) != UNZ_OK)
        err=UNZ_ERRNO;

    lSeek+=file_info.size_filename;
    if ((err==UNZ_OK) && (szFileName!=NULL))
    {
        uLong uSizeRead ;
        if (file_info.size_filename<fileNameBufferSize)
        {
            *(szFileName+file_info.size_filename)='\0';
            uSizeRead = file_info.size_filename;
        }
        else
            uSizeRead = fileNameBufferSize;

        if ((file_info.size_filename>0) && (fileNameBufferSize>0))
            if (ZREAD(s->z_filefunc, s->filestream,szFileName,uSizeRead)!=uSizeRead)
                err=UNZ_ERRNO;
        lSeek -= uSizeRead;
    }


    if ((err==UNZ_OK) && (extraField!=NULL))
    {
        uLong uSizeRead ;
        if (file_info.size_file_extra<extraFieldBufferSize)
            uSizeRead = file_info.size_file_extra;
        else
            uSizeRead = extraFieldBufferSize;

        if (lSeek!=0)
            if (ZSEEK(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
                lSeek=0;
            else
                err=UNZ_ERRNO;
        if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
            if (ZREAD(s->z_filefunc, s->filestream,extraField,uSizeRead)!=uSizeRead)
                err=UNZ_ERRNO;
        lSeek += file_info.size_file_extra - uSizeRead;
    }
    else
        lSeek+=file_info.size_file_extra;


    if ((err==UNZ_OK) && (szComment!=NULL))
    {
        uLong uSizeRead ;
        if (file_info.size_file_comment<commentBufferSize)
        {
            *(szComment+file_info.size_file_comment)='\0';
            uSizeRead = file_info.size_file_comment;
        }
        else
            uSizeRead = commentBufferSize;

        if (lSeek!=0)
            if (ZSEEK(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
                lSeek=0;
            else
                err=UNZ_ERRNO;
        if ((file_info.size_file_comment>0) && (commentBufferSize>0))
            if (ZREAD(s->z_filefunc, s->filestream,szComment,uSizeRead)!=uSizeRead)
                err=UNZ_ERRNO;
        lSeek+=file_info.size_file_comment - uSizeRead;
    }
    else
        lSeek+=file_info.size_file_comment;

    if ((err==UNZ_OK) && (pfile_info!=NULL))
        *pfile_info=file_info;

    if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
        *pfile_info_internal=file_info_internal;

    return err;
}



/*
  Write info about the ZipFile in the *pglobal_info structure.
  No preparation of the structure is needed
  return UNZ_OK if there is no problem.
*/
extern int ZEXPORT unzGetCurrentFileInfo (file,
                                          pfile_info,
                                          szFileName, fileNameBufferSize,
                                          extraField, extraFieldBufferSize,
                                          szComment,  commentBufferSize)
    unzFile file;
    unz_file_info *pfile_info;
    char *szFileName;
    uLong fileNameBufferSize;
    void *extraField;
    uLong extraFieldBufferSize;
    char *szComment;
    uLong commentBufferSize;
{
    return unzlocal_GetCurrentFileInfoInternal(file,pfile_info,NULL,
                                                szFileName,fileNameBufferSize,
                                                extraField,extraFieldBufferSize,
                                                szComment,commentBufferSize);
}

/*
  Set the current file of the zipfile to the first file.
  return UNZ_OK if there is no problem
*/
extern int ZEXPORT unzGoToFirstFile (file)
    unzFile file;
{
    int err=UNZ_OK;
    unz_s* s;

    if (file==NULL)
        return UNZ_PARAMERROR;
    s=(unz_s*)file;
    s->pos_in_central_dir=s->offset_central_dir;
    s->num_file=0;

    err=unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
                                             &s->cur_file_info_internal,
                                             NULL,0,NULL,0,NULL,0);

    s->current_file_ok = (err == UNZ_OK);
    return err;
}

/*
  Set the current file of the zipfile to the next file.
  return UNZ_OK if there is no problem
  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
*/
extern int ZEXPORT unzGoToNextFile (file)
    unzFile file;
{
    unz_s* s;
    int err;

    if (file==NULL)