how to decode the Cross—Reference Streams of pdf using c++/c？

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C++

C

PDF

I want to decode the xref stream,i try use the zlib to decode the stream
such as(PDF1.6):

endobj
66 0 obj<</ID[<BEC815FAE920FA49BC95137CB963B597><E5BAAF8902465FB2FA94F1593AB60200>]/Info 30 0 R/Prev 116/Root 32 0 R/Size 67/Type/XRef/W[1 3 1]/Index[30 1 51 1 64 3]/DecodeParms<</Columns 5/Predictor 12>>/Filter/FlateDecode/Length 32>>stream
x赾bb`p`
endstream
endobj

my code:(buffer(char *) save the string of obj)

<pre lang="c++/c">
		int m_start=FindString(buffer,PCSTREM,buffersize);
		int m_end=FindString(buffer,PCENDSTREAM,buffersize);
		if(m_start&&m_end&&(m_end>m_start))
		{
			m_start += 6;
			if(buffer[m_start]==0x0d&&buffer[m_start+1]==0x0a)
				m_start+=2;
			else if(buffer[m_start]=0x0a)
				m_start++;
			if(buffer[m_end-2]==0x0d&&buffer[m_end-1]==0x0a)
				m_end-=2;
			else if(buffer[m_start-1]=0x0a)
				m_end--;
			size_t outsize = (m_end - m_start)*10;
			char* output = new char [outsize]; 
			ZeroMemory(output, outsize);
			z_stream zstrm;
			ZeroMemory(&zstrm, sizeof(zstrm));

			zstrm.avail_in = m_end-m_start+1;
			zstrm.avail_out = outsize;
			zstrm.next_in = (Bytef*)(buffer + m_start);
			zstrm.next_out = (Bytef*)output;

			int rsti = inflateInit(&zstrm);
			if (rsti == Z_OK)
			{
				int rst2 = inflate (&zstrm, Z_FINISH);
				if (rst2 >= 0)
				{
					size_t totout = zstrm.total_out;
					printf("decode:%d \n",totout);
				}
			}

but i can't do it very well,i find messy code in the output,how can help me!