tildefriends/src/packetstream.c

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#include "packetstream.h"
#include "mem.h"
#include "uv.h"
#include <stdbool.h>
#include <string.h>
typedef struct _tf_packetstream_t {
tf_packetstream_onreceive_t* onreceive;
void* onreceive_user_data;
uv_pipe_t stream;
char* buffer;
size_t buffer_size;
size_t buffer_capacity;
bool destroyed;
} tf_packetstream_t;
tf_packetstream_t* tf_packetstream_create()
{
tf_packetstream_t* impl = tf_malloc(sizeof(tf_packetstream_t));
*impl = (tf_packetstream_t) { 0 };
return impl;
}
void tf_packetstream_destroy(tf_packetstream_t* stream)
{
stream->onreceive = NULL;
stream->onreceive_user_data = NULL;
stream->destroyed = true;
if (stream->buffer)
{
tf_free(stream->buffer);
stream->buffer = NULL;
}
if (stream->stream.data)
{
tf_packetstream_close(stream);
}
else
{
tf_free(stream);
}
}
static void _packetstream_allocate(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buffer)
{
buffer->base = tf_malloc(suggested_size);
buffer->len = suggested_size;
}
static void _packetstream_process_messages(tf_packetstream_t* stream)
{
int packet_type = 0;
size_t length = 0;
while (stream->buffer_size >= sizeof(packet_type) + sizeof(length))
{
memcpy(&packet_type, stream->buffer, sizeof(packet_type));
memcpy(&length, stream->buffer + sizeof(packet_type), sizeof(length));
if (stream->buffer_size >= sizeof(packet_type) + sizeof(length) + length)
{
if (stream->onreceive)
{
stream->onreceive(packet_type, stream->buffer + sizeof(length) + sizeof(packet_type), length, stream->onreceive_user_data);
}
size_t consumed = sizeof(length) + sizeof(packet_type) + length;
memmove(stream->buffer, stream->buffer + consumed, stream->buffer_size - consumed);
stream->buffer_size -= consumed;
}
else
{
break;
}
}
}
static void _packetstream_on_read(uv_stream_t* handle, ssize_t count, const uv_buf_t* buffer)
{
tf_packetstream_t* stream = handle->data;
if (count >= 0)
{
if (count > 0)
{
char* write_buffer = stream->buffer;
if (stream->buffer_size + count > stream->buffer_capacity)
{
if (!stream->buffer_capacity)
{
stream->buffer_capacity = 256;
}
while (stream->buffer_capacity < stream->buffer_size + count)
{
stream->buffer_capacity *= 2;
}
write_buffer = tf_realloc(write_buffer, stream->buffer_capacity);
}
if (write_buffer)
{
memcpy(write_buffer + stream->buffer_size, buffer->base, count);
stream->buffer = write_buffer;
stream->buffer_size += count;
}
_packetstream_process_messages(stream);
}
}
else
{
tf_packetstream_close(stream);
}
tf_free(buffer->base);
}
void tf_packetstream_start(tf_packetstream_t* stream)
{
stream->stream.data = stream;
uv_read_start((uv_stream_t*)&stream->stream, _packetstream_allocate, _packetstream_on_read);
}
static void _packetstream_on_write(uv_write_t* request, int status)
{
tf_free(request);
}
void tf_packetstream_send(tf_packetstream_t* stream, int packet_type, const char* begin, size_t length)
{
size_t buffer_length = sizeof(uv_write_t) + sizeof(packet_type) + sizeof(length) + length;
uv_write_t* request = tf_malloc(buffer_length);
memset(request, 0, sizeof(uv_write_t));
char* buffer = (char*)(request + 1);
memcpy(buffer, &packet_type, sizeof(packet_type));
memcpy(buffer + sizeof(packet_type), &length, sizeof(length));
if (length)
{
memcpy(buffer + sizeof(packet_type) + sizeof(length), begin, length);
}
uv_buf_t write_buffer;
write_buffer.base = buffer;
write_buffer.len = sizeof(packet_type) + sizeof(length) + length;
uv_write(request, (uv_stream_t*)&stream->stream, &write_buffer, 1, _packetstream_on_write);
}
void tf_packetstream_set_on_receive(tf_packetstream_t* stream, tf_packetstream_onreceive_t* callback, void* user_data)
{
stream->onreceive = callback;
stream->onreceive_user_data = user_data;
}
static void _tf_packetstream_handle_closed(uv_handle_t* handle)
{
tf_packetstream_t* packetstream = handle->data;
handle->data = NULL;
if (packetstream->buffer)
{
tf_free(packetstream->buffer);
packetstream->buffer = NULL;
}
if (packetstream->destroyed)
{
tf_free(packetstream);
}
}
void tf_packetstream_close(tf_packetstream_t* stream)
{
if (stream->stream.data && !uv_is_closing((uv_handle_t*)&stream->stream))
{
uv_close((uv_handle_t*)&stream->stream, _tf_packetstream_handle_closed);
}
}
uv_pipe_t* tf_packetstream_get_pipe(tf_packetstream_t* stream)
{
return &stream->stream;
}