146 lines
2.7 KiB
C
146 lines
2.7 KiB
C
#include "msg.h"
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#include "error.h"
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#include "usocket.h"
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#include <assert.h>
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int msg_format_read (struct msg *m, const char *buf, size_t msize)
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{
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assert (m != NULL);
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assert (buf != NULL);
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assert (msize >= 3);
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assert (msize <= BUFSIZ - 3);
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if (m == NULL)
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return -1;
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m->type = buf[0];
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memcpy (&m->valsize, buf+1, 2);
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assert (m->valsize <= BUFSIZ -3);
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if (m->val != NULL)
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free (m->val), m->val = NULL;
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if (m->val == NULL) {
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m->val = malloc (m->valsize);
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memcpy (m->val, buf+3, m->valsize);
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}
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return 0;
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}
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int msg_format_write (struct msg *m, char **buf, size_t *msize)
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{
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assert (m != NULL);
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assert (buf != NULL);
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assert (msize != NULL);
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assert (m->valsize <= BUFSIZ -3);
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if (m == NULL)
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return -1;
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if (buf == NULL)
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return -2;
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if (msize == NULL)
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return -3;
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char *buffer = *buf;
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buffer[0] = m->type;
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memcpy (buffer + 1, &m->valsize, 2);
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memcpy (buffer + 3, &m->val, (m->valsize <= BUFSIZ) ? m->valsize : BUFSIZ);
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return 0;
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}
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int msg_read (int fd, struct msg *m)
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{
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assert (m != NULL);
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char *buf = NULL;
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size_t msize = 0;
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int ret = usock_recv (fd, &buf, &msize);
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if (ret < 0) {
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handle_err ("msg_read", "usock_recv");
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return ret;
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}
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if (msg_format_read (m, buf, msize) < 0) {
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return -1;
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}
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free (buf);
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return 0;
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}
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int msg_write (int fd, const struct msg *m)
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{
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assert (m != NULL);
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char *buf = NULL;
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size_t msize = 0;
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msg_format_write (m, &buf, &msize);
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int ret = usock_send (fd, buf, msize);
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if (ret < 0) {
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handle_err ("msg_write", "usock_send");
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return ret;
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}
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if (buf != NULL)
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free (buf);
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return 0;
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}
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// MSG FORMAT
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int msg_format (struct msg *m, char type, const char *val, size_t valsize)
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{
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assert (m != NULL);
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assert (valsize + 3 <= BUFSIZ);
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assert (valsize == 0 && val == NULL || valsize > 0 && val != NULL);
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if (valsize + 3 > BUFSIZ) {
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handle_err ("msg_format_con", "msgsize > BUFSIZ");
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return -1;
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}
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m->type = type;
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m->valsize = (short) valsize;
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memcpy (m->val, val, valsize);
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return 0;
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}
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int msg_format_con (struct msg *m, const char *val, size_t valsize)
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{
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return msg_format (m, MSG_TYPE_CON, val, valsize);
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}
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int msg_format_data (struct msg *m, const char *val, size_t valsize)
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{
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return msg_format (m, MSG_TYPE_DATA, val, valsize);
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}
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int msg_format_ack (struct msg *m, const char *val, size_t valsize)
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{
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return msg_format (m, MSG_TYPE_ACK, val, valsize);
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}
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int msg_free (struct msg *m)
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{
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assert (m != NULL);
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if (m == NULL)
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return -1;
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if (m->val != NULL)
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free (m->val);
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return 0;
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}
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