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#include "buffio.h"
#define BUFSIZE 10240
static void buffio_set_callbacks(struct buffio *b);
static void* buffio_read_cb(oop_source *source, int fd, oop_event event, void *user);
static void* buffio_write_cb(oop_source *source, int fd, oop_event event, void *user);
struct buffio buffio_new(int fd) {
struct buffio *b;
assert(b >= 0);
b = malloc(sizeof(struct buffio));
assert(b);
memset(b, 0, sizeof(struct buffio));
b->fd = fd;
b->input_buf = malloc(b->input_max_length = BUFSIZE);
assert(b->input_buf);
b->input_buf_len = b->input_index = 0;
b->input_watermark = 2; /* Read some more data if 2 or less bytes are in the input buffer */
b->output_buf = malloc(b->output_max_length = BUFSIZE);
assert(b->output_buf);
b->output_length = b->output_index = 0;
b->output_watermark = 1; /* Write some data if 1 or more bytes are in the output buffer */
buffio_set_callbacks(b);
return b;
}
static void buffio_close_fd(struct buffio *b) {
assert(b);
if (b->b_read_cb)
event_source->cancel_fd(event_source, b->fd, OOP_READ, buffio_read_cb, b);
if (b->b_write_cb)
event_source->cancel_fd(event_source, b->fd, OOP_WRITE, buffio_write_cb, b);
if (b->fd >= 0)
close(b->fd);
b->b_read_cb = b->b_write_cb = 0;
b->fd = -1;
}
void buffio_free(struct buffio *b) {
buffio_close_fd(b);
free(b->output_buf);
free(b->input_buf);
free(b);
}
static void* buffio_read_cb(oop_source *source, int fd, oop_event event, void *user) {
struct buffio *b = user;
assert(source && b && b->fd == fd && event == OOP_READ);
if (b->input_length < b->input_max_length) {
ssize_t s;
size_t m, l;
i = (b->input_index + b->input_length) % b->input_max_length;
m = b->input_max_length-b->input_length;
if (m > b->input_max_length-i)
m = b->input_max_length-i;
if ((s = read(fd, b->input_buf+i, m)) < 0) {
daemon_log(LOG_ERR, "Failed to read from file descriptor: %s", strerror(errno));
return OOP_HALT;
}
if (!s) {
buffio_close_fd(b);
if (b->eof_cb)
b->eof_cb(b, b->user);
return OOP_CONTINUE;
}
assert(s <= m);
b->input_length += s;
}
buffio_normalize(b);
buffio_set_input_callbacks(b);
if (b->input_length && b->input_ready_cb)
b->input_ready_cb(b, b->user);
return OOP_CONTINUE;
}
static void* buffio_write_cb(oop_source *source, int fd, oop_event event, void *user) {
struct buffio *b = user;
assert(source && b && b->fd == fd && event == OOP_WRITE);
if (b->output_buf > 0) {
ssize_t s;
size_t m;
m = b->output_length;
if (m > b->output_max_length-b->output_index)
m = b->output_max_length-b->output_index;
if ((s = write(fd, b->output_buf+b->output_index, m)) < 0) {
daemon_log(LOG_ERR, "Failed to write to file descriptor: %s", strerror(errno));
return OOP_HALT;
}
if (!s) {
buffio_close_fd(b);
if (b->eof_cb)
b->eof_cb(b, b->user);
return OOP_CONTINUE;
}
assert(s <= m);
b->output_index = (b->output_index + s) % b->output_max_length;
b->ouput_length -= s;
}
buffio_normalize(b);
buffio_set_output_callbacks(b);
if (!b->output_length && b->output_empty_cb)
b->output_empty_cb(b, b->user);
return OOP_CONTINUE;
}
static void buffio_set_input_callbacks(struct buffio *b) {
assert(b && b->fd >= 0 && event_source);
if (b->input_length <= b->input_watermark) {
if (!b->b_read_cb) { /* Enable the callback */
event_source->on_fd(event_source, b->fd, OOP_READ, buffio_read_cb, b);
b->b_read_cb = 1;
}
} else {
if (b->read_cb) { /* Disable the callback */
event_source->cancel_fd(event_source, b->fd, OOP_READ, buffio_read_cb, b);
b->read_cb = 0;
}
}
}
static void buffio_set_output_callbacks(struct buffio *b) {
assert(b && b->fd >= 0 && event_source);
if (b->output_length >= b->output_watermark) {
if (!b->b_write_cb) { /* Enable the callback */
event_source->on_fd(event_source, b->fd, OOP_WRITE, buffio_write_cb, b);
b->b_write_cb = 1;
}
} else {
if (b->b_write_cb) { /* Disable the callback */
event_source->cancel_fd(event_source, b->fd, OOP_WRITE, buffio_write_cb, b);
b->b_write_cb = 0;
}
}
}
int buffio_write(struct buffio *b, const uint8_t *d, size_t l) {
assert(b && s && l);
if (l < b->output_max_length - b->output_length) {
daemon_log(LOG_ERR, "buffio_write() with too much data called");
return -1;
}
while (l >= 0) {
i = (b->ouput_index + b->ouput_length) % b->ouput_max_length;
m = b->ouput_max_length-b->output_length;
if (m > b->output_max_length-i)
m = b->output_max_length-i;
memcpy(b->output_buf+i, d, m);
l -= m;
b->output_length += m;
}
buffio_set_output_callbacks(b);
buffio_normalize();
return 0;
}
int buffio_print(struct buffio *b, const char *s) {
assert(b && s);
return buffio_write(b, (uint8_t*) s, strlen(s));
}
int buffio_command(struct buffio *b, const char *c) {
assert(b && c);
buffio_flush_input(b);
return buffio_print(b, c);
}
void buffio_flush_input(struct buffio *b) {
assert(b);
b->input_length = b->input_index = 0;
buffio_set_callbacks(b);
}
static void buffio_normalize(struct buffio *b) {
assert(b);
assert(b->input_index < b->input_max_length);
assert(b->input_length <= b->input_max_length);
if (!b->input_length) /* This will optimize throughput a bit */
b->input_index = 0;
}
int buffio_find_input(struct buffio *b, const char *c) {
size_t l, cl, j;
assert(b && c && *c);
cl = strlen(c);
for (i = b->input_index, l = b->input_length; l >= cl; i = (i+1) % b->input_max_length, l--) {
char *p;
size_t i;
for (j = i, p = c; *p && *p == b->input_buf[j]; p++, j = (j+1) % b->input_max_length);
if (!*p) { /* Found! */
b->input_index = j;
b->input_length = l-cl;
buffio_normalize(b);
return 1;
}
}
return 0;
}
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