#include <u.h>
#include <libc.h>
#include <bio.h>


Biobuf stdin, stdout;
char* buf;
int linelen, chunked=0;
char* tec = "Transfer-Encoding: chunked\r\n";


char *
readline(void) {
	if(buf = Brdline(&stdin, '\n'))
		return buf;

	exits("eof stdin");
}

void
read_plain(void) {
	while(buf = Brdline(&stdin, '\n'))
		Bwrite(&stdout, buf, Blinelen(&stdin));
}

void
read_chunked(void) {
	long chunksize;
	void* rbuff;
	int bread;
	readline();
	buf[Blinelen(&stdin) -2] = 0;
	chunksize = strtol(buf, 0, 16);
	rbuff = malloc(1024);
	do {
		while(chunksize > 0) {
			bread = Bread(&stdin, rbuff, 1024L < chunksize ? 1024L : chunksize);
			if(bread < 0)
				exits("EOF stdin");
			Bwrite(&stdout, rbuff, bread);
			chunksize -= bread;
		}
		readline();
		readline();
		buf[Blinelen(&stdin) -2] = 0;
		chunksize = strtol(buf, 0, 16);
	} while(chunksize > 0);
	free(rbuff);
}

void
main(int argc, char *argv[])
{
	Binit(&stdin, 0, OREAD);
	Binit(&stdout, 1, OWRITE);
	
	while(readline()) {
		linelen = Blinelen(&stdin);
		if(linelen == 2) // blank line
			break;

		if(linelen == strlen(tec) && strncmp(tec, buf, strlen(tec)) == 0)
				chunked = 1;
		else
			Bwrite(&stdout, buf, linelen);
	}
	if(buf) {
		Bwrite(&stdout, buf, linelen);
		chunked ? read_chunked() : read_plain();
	}
	Bterm(&stdin);
	Bterm(&stdout);
	exits(0);
}

// 8c dechunk.c && 8l dechunk.8 && mv 8.out dechunk

// dechunk < chunked.html