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PKZIP 파일 복원 예제

void zip_decompress(const char* src_filename)

{

//파일 열기

FILE* fin = fopen(src_filename, "rb");

if(fin == NULL){

printf("%s open failed\n", src_filename);

exit(1);

}

else{

fprintf(stderr,"%s open succeeded\n",src_filename);

}

fseek(fin,0,SEEK_SET);

//헤더 내용 확인

long local_file_header_signature;

fread(&local_file_header_signature,sizeof(long),1,fin);

if( local_file_header_signature!=0x04034b50 ){

fprintf(stderr,"local_file_header_signature wrong!!\n");

exit(1);

}

else{

fprintf(stderr,"local_file_header_signature right!!\n");

}

short version_needed;

fread(&version_needed,sizeof(short),1,fin);

fprintf(stderr,"version needed to extract = %d\n",version_needed);

short general_purpose_bit_flag;

fread(&general_purpose_bit_flag,sizeof(short),1,fin);

fprintf(stderr,"general_purpose_bit_flag = %d\n",general_purpose_bit_flag);

short compression_method;

fread(&compression_method,sizeof(short),1,fin);

fprintf(stderr,"compression method = %d\n",compression_method);

short last_mod_file_time;

fread(&last_mod_file_time,sizeof(short),1,fin);

fprintf(stderr,"last mod file time = %d\n",last_mod_file_time);

short last_mod_file_date;

fread(&last_mod_file_date,sizeof(short),1,fin);

fprintf(stderr,"last mod file date = %d\n",last_mod_file_date);

long crc32;

fread(&crc32,sizeof(long),1,fin);

fprintf(stderr,"crc32 = %X\n",crc32);

long compressed_size;

fread(&compressed_size,sizeof(long),1,fin);

fprintf(stderr,"compressed_size = %d\n",compressed_size);

long uncompressed_size;

fread(&uncompressed_size,sizeof(long),1,fin);

fprintf(stderr,"uncompressed_size = %d\n",uncompressed_size);

short file_name_length;

fread(&file_name_length,sizeof(short),1,fin);

fprintf(stderr,"file name length= %d\n",file_name_length);

short extra_field_length;

fread(&extra_field_length,sizeof(short),1,fin);

fprintf(stderr,"extra field length = %d\n",extra_field_length);

char *filename=new char[file_name_length+1];

fread(filename,file_name_length,1,fin);

filename[file_name_length]='\0';

fprintf(stderr,"file name = %s\n",filename);

//복원하기

z_stream z;

unsigned char *inbuf;

unsigned char *outbuf;

int INBUFSIZE;

int OUTBUFSIZE;

int compressedSize=compressed_size;

int orgSize=uncompressed_size;

char *compressedData=new char[compressedSize];

fread(compressedData,compressedSize,1,fin);

char *orgData=new char[orgSize];

orgData[0]='\0';

INBUFSIZE=compressedSize;

OUTBUFSIZE=orgSize;

inbuf = (unsigned char *)malloc(INBUFSIZE);

outbuf = (unsigned char *)malloc(OUTBUFSIZE);

inbuf=(unsigned char*)compressedData;

strcpy((char*)outbuf, "garbage");

z.zalloc = (alloc_func)0;

z.zfree = (free_func)0;

z.opaque = (voidpf)0;

z.next_in = inbuf;

z.avail_in = 0;

z.next_out = outbuf;

int err = inflateInit2(&z,-(MAX_WBITS));

while (z.total_out < orgSize && z.total_in < compressedSize) {

z.avail_in = z.avail_out = 4096;

err = inflate(&z, Z_NO_FLUSH);

if (err == Z_STREAM_END) break;

if (err != Z_OK) {

fprintf(stderr, "inflate error: %d\n", err);

exit(1);

}

}

err = inflateEnd(&z);

if (err != Z_OK) {

fprintf(stderr, "inflateEnd error: %d\n", err);

exit(1);

}

fprintf(stderr,"%s",outbuf);

}