void ensure_chunks(Chunk *chunks, int *chunk_count, int p, int q, int force) {
int count = *chunk_count;
for (int i = 0; i < count; i++) {
Chunk *chunk = chunks + i;
if (chunk_distance(chunk, p, q) >= DELETE_CHUNK_RADIUS) {
map_free(&chunk->map);
glDeleteBuffers(1, &chunk->position_buffer);
glDeleteBuffers(1, &chunk->normal_buffer);
glDeleteBuffers(1, &chunk->uv_buffer);
Chunk *other = chunks + (--count);
memcpy(chunk, other, sizeof(Chunk));
}
}
int n = CREATE_CHUNK_RADIUS;
for (int i = -n; i <= n; i++) {
for (int j = -n; j <= n; j++) {
int a = p + i;
int b = q + j;
if (!find_chunk(chunks, count, a, b)) {
make_chunk(chunks + count, a, b);
count++;
if (!force) {
*chunk_count = count;
return;
}
}
}
}
*chunk_count = count;
}
void ensure_chunks(Chunk *chunks, int *chunk_count, int p, int q, int force) {
int count = *chunk_count;
for (int i = 0; i < count; i++) {
Chunk *chunk = chunks + i;
if (chunk_distance(chunk, p, q) >= DELETE_CHUNK_RADIUS) {
map_free(&chunk->map);
glDeleteBuffers(1, &chunk->position_buffer);
glDeleteBuffers(1, &chunk->normal_buffer);
glDeleteBuffers(1, &chunk->uv_buffer);
Chunk *other = chunks + (--count);
memcpy(chunk, other, sizeof(Chunk));
}
}
int n = force ? 1 : CREATE_CHUNK_RADIUS;
for (int i = 0; i <= n; i++) {
for (int dp = -n; dp <= n; dp++) {
for (int dq = -n; dq <= n; dq++) {
int j = MAX(ABS(dp), ABS(dq));
if (i != j) {
continue;
}
int a = p + dp;
int b = q + dq;
if (!find_chunk(chunks, count, a, b)) {
make_chunk(chunks + count, a, b);
count++;
if (!force) {
*chunk_count = count;
return;
}
}
}
}
}
*chunk_count = count;
}
void fxx() {
boost::asio::io_context ioc;
auto work = boost::asio::make_work_guard(ioc);
std::thread t{[&](){ ioc.run(); }};
boost::asio::ip::tcp::socket sock{ioc};
{
//[http_snippet_2
request<empty_body> req;
req.version(11); // HTTP/1.1
req.method(verb::get);
req.target("/index.htm");
req.set(field::accept, "text/html");
req.set(field::user_agent, "Beast");
//]
}
{
//[http_snippet_3
response<string_body> res;
res.version(11); // HTTP/1.1
res.result(status::ok);
res.set(field::server, "Beast");
res.body() = "Hello, world!";
res.prepare_payload();
//]
}
{
//[http_snippet_4
flat_buffer buffer; // (The parser is optimized for flat buffers)
request<string_body> req;
read(sock, buffer, req);
//]
}
{
//[http_snippet_5
flat_buffer buffer;
response<string_body> res;
async_read(sock, buffer, res,
[&](error_code ec, std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
std::cerr << ec.message() << std::endl;
});
//]
}
{
//[http_snippet_6
// This buffer's max size is too small for much of anything
flat_buffer buffer{10};
// Try to read a request
error_code ec;
request<string_body> req;
read(sock, buffer, req, ec);
if(ec == error::buffer_overflow)
std::cerr << "Buffer limit exceeded!" << std::endl;
//]
}
{
//[http_snippet_7
response<string_body> res;
res.version(11);
res.result(status::ok);
res.set(field::server, "Beast");
res.body() = "Hello, world!";
res.prepare_payload();
error_code ec;
write(sock, res, ec);
//]
//[http_snippet_8
async_write(sock, res,
[&](error_code ec, std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
if(ec)
std::cerr << ec.message() << std::endl;
});
//]
}
{
//[http_snippet_10
response<string_body> res;
response_serializer<string_body> sr{res};
//]
}
{
//[http_snippet_18
// Prepare an HTTP/1.1 response with a chunked body
response<empty_body> res{status::ok, 11};
res.set(field::server, "Beast");
// Set Transfer-Encoding to "chunked".
// If a Content-Length was present, it is removed.
res.chunked(true);
// Set up the serializer
response_serializer<empty_body> sr{res};
// Write the header first
write_header(sock, sr);
// Now manually emit three chunks:
boost::asio::write(sock, make_chunk(get_next_chunk_body()));
boost::asio::write(sock, make_chunk(get_next_chunk_body()));
boost::asio::write(sock, make_chunk(get_next_chunk_body()));
// We are responsible for sending the last chunk:
boost::asio::write(sock, make_chunk_last());
//]
}
{
//[http_snippet_19
// Prepare a set of chunk extension to emit with the body
chunk_extensions ext;
ext.insert("mp3");
ext.insert("title", "Beale Street Blues");
ext.insert("artist", "W.C. Handy");
// Write the next chunk with the chunk extensions
// The implementation will make a copy of the extensions object,
// so the caller does not need to manage lifetime issues.
boost::asio::write(sock, make_chunk(get_next_chunk_body(), ext));
// Write the next chunk with the chunk extensions
// The implementation will make a copy of the extensions object, storing the copy
// using the custom allocator, so the caller does not need to manage lifetime issues.
boost::asio::write(sock, make_chunk(get_next_chunk_body(), ext, std::allocator<char>{}));
// Write the next chunk with the chunk extensions
// The implementation allocates memory using the default allocator and takes ownership
// of the extensions object, so the caller does not need to manage lifetime issues.
// Note: ext is moved
boost::asio::write(sock, make_chunk(get_next_chunk_body(), std::move(ext)));
//]
}
{
//[http_snippet_20
// Manually specify the chunk extensions.
// Some of the strings contain spaces and a period and must be quoted
boost::asio::write(sock, make_chunk(get_next_chunk_body(),
";mp3"
";title=\"Danny Boy\""
";artist=\"Fred E. Weatherly\""
));
//]
}
{
//[http_snippet_21
// Prepare a chunked HTTP/1.1 response with some trailer fields
response<empty_body> res{status::ok, 11};
res.set(field::server, "Beast");
// Inform the client of the trailer fields we will send
res.set(field::trailer, "Content-MD5, Expires");
res.chunked(true);
// Serialize the header and two chunks
response_serializer<empty_body> sr{res};
write_header(sock, sr);
boost::asio::write(sock, make_chunk(get_next_chunk_body()));
boost::asio::write(sock, make_chunk(get_next_chunk_body()));
// Prepare the trailer
fields trailer;
trailer.set(field::content_md5, "f4a5c16584f03d90");
trailer.set(field::expires, "never");
// Emit the trailer in the last chunk.
// The implementation will use the default allocator to create the storage for holding
// the serialized fields.
boost::asio::write(sock, make_chunk_last(trailer));
//]
}
{
//[http_snippet_22
// Use a custom allocator for serializing the last chunk
fields trailer;
trailer.set(field::approved, "yes");
boost::asio::write(sock, make_chunk_last(trailer, std::allocator<char>{}));
//]
}
{
//[http_snippet_23
// Manually emit a trailer.
// We are responsible for ensuring that the trailer format adheres to the specification.
string_view ext =
"Content-MD5: f4a5c16584f03d90\r\n"
"Expires: never\r\n"
"\r\n";
boost::asio::write(sock, make_chunk_last(boost::asio::const_buffer{ext.data(), ext.size()}));
//]
}
{
//[http_snippet_24
// Prepare a chunked HTTP/1.1 response and send the header
response<empty_body> res{status::ok, 11};
res.set(field::server, "Beast");
res.chunked(true);
response_serializer<empty_body> sr{res};
write_header(sock, sr);
// Obtain three body buffers up front
auto const cb1 = get_next_chunk_body();
auto const cb2 = get_next_chunk_body();
auto const cb3 = get_next_chunk_body();
// Manually emit a chunk by first writing the chunk-size header with the correct size
boost::asio::write(sock, chunk_header{
boost::asio::buffer_size(cb1) +
boost::asio::buffer_size(cb2) +
boost::asio::buffer_size(cb3)});
// And then output the chunk body in three pieces ("chunk the chunk")
boost::asio::write(sock, cb1);
boost::asio::write(sock, cb2);
boost::asio::write(sock, cb3);
// When we go this deep, we are also responsible for the terminating CRLF
boost::asio::write(sock, chunk_crlf{});
//]
}
} // fxx()