#include <stdio.h>#include <string.h> #include <parserutils/parserutils.h>#include <parserutils/utils/buffer.h> #include "utils/utils.h" #include "testutils.h" #define BUFF_LEN 2000 int main(int argc, char **argv){	uint8_t data[BUFF_LEN];	parserutils_buffer *buf;	int i; 	UNUSED(argc);	UNUSED(argv); 	assert(parserutils_buffer_create(&buf) == PARSERUTILS_OK); 	/* Populate the data with '4's */	for (i = 0; i < BUFF_LEN; i++)		data[i] = '4'; 	assert(parserutils_buffer_append(buf, data, BUFF_LEN) ==			PARSERUTILS_OK); 	/* Double the size, appending 'c's */	for (i = 0; i < BUFF_LEN; i++)		data[i] = 'c'; 	assert(parserutils_buffer_append(buf, data, BUFF_LEN) ==			PARSERUTILS_OK);	assert(buf->length == 2 * BUFF_LEN); 	/* Now reduce the length by half */	/* Buffer length is all '4's now */	buf->length = BUFF_LEN; 	/* Now discard half of the 4s from the middle of the buffer */	assert(parserutils_buffer_discard(buf, BUFF_LEN / 4, BUFF_LEN / 2) ==			PARSERUTILS_OK); 	/* Now check that the length is what we expect */	assert(buf->length == BUFF_LEN / 2); 	/* Now check that the buffer contains what we expect */	for (i = 0; i < BUFF_LEN / 2; i++)		assert(buf->data[i] == '4'); 	/* Now check that the space we allocated beyond the buffer length is	 * as we expect, and not overwritten with 'c', which should be beyond	 * what the buffer_ code is allowed to move. */	for (i = BUFF_LEN / 2; i < BUFF_LEN; i++)		assert(buf->data[i] != 'c');	 	assert(parserutils_buffer_destroy(buf) == PARSERUTILS_OK); 	printf("PASS\n"); 	return 0;}