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5.4

C++ To Delphi Translation Help

Asked by ThievingSix in Delphi Programming, C++ Programming Language

Alright, I have some file format conversion code in C++ and gave it my best shot in translating myself. Inflate causes a nice a/v and it's probably because I declared things wrong.

First post will have the C++ code, second post will be my attempt.

Any ideas on where I messed up =)?

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             int decomp_ciso(void)
{
	unsigned long long file_size;
	unsigned int index , index2;
	unsigned long long read_pos , read_size;
	int total_sectors;
	int index_size;
	int block;
	unsigned char buf4[4];
	int cmp_size;
	int status;
	int percent_period;
	int percent_cnt;
	int plain;
 
	// read header
	if( fread(&ciso, 1, sizeof(ciso), fin) != sizeof(ciso) )
	{
		printf("file read error\n");
		return 1;
	}
 
	// check header
	if(
		ciso.magic[0] != 'C' ||
		ciso.magic[1] != 'I' ||
		ciso.magic[2] != 'S' ||
		ciso.magic[3] != 'O' ||
		ciso.block_size ==0  ||
		ciso.total_bytes == 0
	)
	{
		printf("ciso file format error\n");
		return 1;
	}
	// 
	ciso_total_block = ciso.total_bytes / ciso.block_size;
 
	// allocate index block
	index_size = (ciso_total_block + 1 ) * sizeof(unsigned long);
	index_buf  = malloc(index_size);
	block_buf1 = malloc(ciso.block_size);
	block_buf2 = malloc(ciso.block_size*2);
 
	if( !index_buf || !block_buf1 || !block_buf2 )
	{
		printf("Can't allocate memory\n");
		return 1;
	}
	memset(index_buf,0,index_size);
 
	// read index block
	if( fread(index_buf, 1, index_size, fin) != index_size )
	{
		printf("file read error\n");
		return 1;
	}
 
	// show info
	printf("Decompress '%s' to '%s'\n",fname_in,fname_out);
	printf("Total File Size %ld bytes\n",ciso.total_bytes);
	printf("block size      %d  bytes\n",ciso.block_size);
	printf("total blocks    %d  blocks\n",ciso_total_block);
	printf("index align     %d\n",1<<ciso.align);
 
	// init zlib
	z.zalloc = Z_NULL;
	z.zfree  = Z_NULL;
	z.opaque = Z_NULL;
 
	// decompress data
	percent_period = ciso_total_block/100;
	percent_cnt = 0;
 
	for(block = 0;block < ciso_total_block ; block++)
	{
		if(--percent_cnt<=0)
		{
			percent_cnt = percent_period;
			printf("decompress %d%%\r",block / percent_period);
		}
 
		if (inflateInit2(&z,-15) != Z_OK)
		{
			printf("deflateInit : %s\n", (z.msg) ? z.msg : "???");
			return 1;
		}
 
		// check index
		index  = index_buf[block];
		plain  = index & 0x80000000;
		index  &= 0x7fffffff;
		read_pos = index << (ciso.align);
		if(plain)
		{
			read_size = ciso.block_size;
		}
		else
		{
			index2 = index_buf[block+1] & 0x7fffffff;
			read_size = (index2-index) << (ciso.align);
		}
		fseek(fin,read_pos,SEEK_SET);
 
		z.avail_in  = fread(block_buf2, 1, read_size , fin);
		if(z.avail_in != read_size)
		{
			printf("block=%d : read error\n",block);
			return 1;
		}
 
		if(plain)
		{
			memcpy(block_buf1,block_buf2,read_size);
			cmp_size = read_size;
		}
		else
		{
			z.next_out  = block_buf1;
			z.avail_out = ciso.block_size;
			z.next_in   = block_buf2;
			status = inflate(&z, Z_FULL_FLUSH);
			if (status != Z_STREAM_END)
			//if (status != Z_OK)
			{
				printf("block %d:inflate : %s[%d]\n", block,(z.msg) ? z.msg : "error",status);
				return 1;
			}
			cmp_size = ciso.block_size - z.avail_out;
			if(cmp_size != ciso.block_size)
			{
				printf("block %d : block size error %d != %d\n",block,cmp_size , ciso.block_size);
				return 1;
			}
		}
		// write decompressed block
		if(fwrite(block_buf1, 1,cmp_size , fout) != cmp_size)
		{
			printf("block %d : Write error\n",block);
			return 1;
		}
 
		// term zlib
		if (inflateEnd(&z) != Z_OK)
		{
			printf("inflateEnd : %s\n", (z.msg) ? z.msg : "error");
			return 1;
		}
	}
 
	printf("ciso decompress completed\n");
	return 0;
}

           
         

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C++ To Delphi Translation Help

Asked by ThievingSix in Delphi Programming, C++ Programming Language

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