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* Copyright (c) 2001-2002 artofcode LLC.
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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ijs_put_int (char *p, int val)
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p[0] = (val >> 24) & 0xff;
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p[1] = (val >> 16) & 0xff;
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p[2] = (val >> 8) & 0xff;
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ijs_send_init (IjsSendChan *ch, int fd)
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ijs_send_int (IjsSendChan *ch, int val)
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if ((ch->buf_size + 4) > (int)sizeof(ch->buf))
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ijs_put_int (ch->buf + ch->buf_size, val);
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ijs_send_begin (IjsSendChan *ch, IjsCommand cmd)
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if (ch->buf_size != 0)
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ijs_send_int (ch, cmd);
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ch->buf_size += 4; /* leave room for size field */
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ijs_send_block (IjsSendChan *ch, const char *buf, int len)
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if ((ch->buf_size + len) > (int)sizeof(ch->buf))
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memcpy (ch->buf + ch->buf_size, buf, len);
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ijs_send_buf (IjsSendChan *ch)
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ijs_put_int (ch->buf + 4, ch->buf_size);
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status = write (ch->fd, ch->buf, ch->buf_size);
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status = (status == ch->buf_size) ? 0 : IJS_EIO;
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ijs_recv_init (IjsRecvChan *ch, int fd)
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ijs_get_int (const char *p)
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const unsigned char *up = (const unsigned char *)p;
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return (up[0] << 24) | (up[1] << 16) | (up[2] << 8) | up[3];
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/* This is a drop-in replacement for read(), but handles partial reads. */
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ijs_recv_read (IjsRecvChan *ch, char *buf, int size)
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nbytes = read (ch->fd, buf + ix, size - ix);
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else if (nbytes == 0)
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ijs_recv_buf (IjsRecvChan *ch)
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nbytes = ijs_recv_read (ch, ch->buf, 8);
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ch->buf_size = ijs_get_int (ch->buf + 4);
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if (ch->buf_size < 8 || ch->buf_size > (int)sizeof(ch->buf))
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data_size = ch->buf_size - 8;
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nbytes = ijs_recv_read (ch, ch->buf + 8, data_size);
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if (nbytes != data_size)
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* ijs_recv_ack: Receive an acknowledgement.
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* Receives an acknowledgement code (generally from server to client).
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* Note that the distinction between local error and error generated
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* by the remote peer is lost in this routine. If it is important to
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* preserve this distinction, use ijs_recv_buf directly instead.
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* Return value: 0 on success, negative on error.
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ijs_recv_ack (IjsRecvChan *ch)
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status = ijs_recv_buf (ch);
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int cmd = ijs_get_int (ch->buf);
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if (cmd == IJS_CMD_NAK)
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if (ch->buf_size != 12)
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status = ijs_get_int (ch->buf + 8);
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ijs_recv_int (IjsRecvChan *ch, int *val)
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if (ch->buf_idx + 4 > ch->buf_size)
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*val = ijs_get_int (ch->buf + ch->buf_idx);
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* Return value: data block size if nonnegative, or error code if
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ijs_recv_block (IjsRecvChan *ch, char *buf, int buf_size)
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int size = ch->buf_size - ch->buf_idx;
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memcpy (buf, ch->buf + ch->buf_idx, size);
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ch->buf_idx = ch->buf_size;