write_or_die(fd, "0000", 4);
}
+void packet_delim(int fd)
+{
+ packet_trace("0001", 4, 1);
+ write_or_die(fd, "0001", 4);
+}
+
+int packet_flush_gently(int fd)
+{
+ packet_trace("0000", 4, 1);
+ if (write_in_full(fd, "0000", 4) < 0)
+ return error("flush packet write failed");
+ return 0;
+}
+
void packet_buf_flush(struct strbuf *buf)
{
packet_trace("0000", 4, 1);
strbuf_add(buf, "0000", 4);
}
-#define hex(a) (hexchar[(a) & 15])
-static void format_packet(struct strbuf *out, const char *fmt, va_list args)
+void packet_buf_delim(struct strbuf *buf)
+{
+ packet_trace("0001", 4, 1);
+ strbuf_add(buf, "0001", 4);
+}
+
+static void set_packet_header(char *buf, const int size)
{
static char hexchar[] = "0123456789abcdef";
+
+ #define hex(a) (hexchar[(a) & 15])
+ buf[0] = hex(size >> 12);
+ buf[1] = hex(size >> 8);
+ buf[2] = hex(size >> 4);
+ buf[3] = hex(size);
+ #undef hex
+}
+
+static void format_packet(struct strbuf *out, const char *fmt, va_list args)
+{
size_t orig_len, n;
orig_len = out->len;
if (n > LARGE_PACKET_MAX)
die("protocol error: impossibly long line");
- out->buf[orig_len + 0] = hex(n >> 12);
- out->buf[orig_len + 1] = hex(n >> 8);
- out->buf[orig_len + 2] = hex(n >> 4);
- out->buf[orig_len + 3] = hex(n);
+ set_packet_header(&out->buf[orig_len], n);
packet_trace(out->buf + orig_len + 4, n - 4, 1);
}
-void packet_write(int fd, const char *fmt, ...)
+static int packet_write_fmt_1(int fd, int gently,
+ const char *fmt, va_list args)
{
static struct strbuf buf = STRBUF_INIT;
- va_list args;
strbuf_reset(&buf);
- va_start(args, fmt);
format_packet(&buf, fmt, args);
+ if (write_in_full(fd, buf.buf, buf.len) < 0) {
+ if (!gently) {
+ check_pipe(errno);
+ die_errno("packet write with format failed");
+ }
+ return error("packet write with format failed");
+ }
+
+ return 0;
+}
+
+void packet_write_fmt(int fd, const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ packet_write_fmt_1(fd, 0, fmt, args);
va_end(args);
- write_or_die(fd, buf.buf, buf.len);
+}
+
+int packet_write_fmt_gently(int fd, const char *fmt, ...)
+{
+ int status;
+ va_list args;
+
+ va_start(args, fmt);
+ status = packet_write_fmt_1(fd, 1, fmt, args);
+ va_end(args);
+ return status;
+}
+
+static int packet_write_gently(const int fd_out, const char *buf, size_t size)
+{
+ static char packet_write_buffer[LARGE_PACKET_MAX];
+ size_t packet_size;
+
+ if (size > sizeof(packet_write_buffer) - 4)
+ return error("packet write failed - data exceeds max packet size");
+
+ packet_trace(buf, size, 1);
+ packet_size = size + 4;
+ set_packet_header(packet_write_buffer, packet_size);
+ memcpy(packet_write_buffer + 4, buf, size);
+ if (write_in_full(fd_out, packet_write_buffer, packet_size) < 0)
+ return error("packet write failed");
+ return 0;
+}
+
+void packet_write(int fd_out, const char *buf, size_t size)
+{
+ if (packet_write_gently(fd_out, buf, size))
+ die_errno("packet write failed");
}
void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
va_end(args);
}
+void packet_buf_write_len(struct strbuf *buf, const char *data, size_t len)
+{
+ size_t orig_len, n;
+
+ orig_len = buf->len;
+ strbuf_addstr(buf, "0000");
+ strbuf_add(buf, data, len);
+ n = buf->len - orig_len;
+
+ if (n > LARGE_PACKET_MAX)
+ die("protocol error: impossibly long line");
+
+ set_packet_header(&buf->buf[orig_len], n);
+ packet_trace(data, len, 1);
+}
+
+int write_packetized_from_fd(int fd_in, int fd_out)
+{
+ static char buf[LARGE_PACKET_DATA_MAX];
+ int err = 0;
+ ssize_t bytes_to_write;
+
+ while (!err) {
+ bytes_to_write = xread(fd_in, buf, sizeof(buf));
+ if (bytes_to_write < 0)
+ return COPY_READ_ERROR;
+ if (bytes_to_write == 0)
+ break;
+ err = packet_write_gently(fd_out, buf, bytes_to_write);
+ }
+ if (!err)
+ err = packet_flush_gently(fd_out);
+ return err;
+}
+
+int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
+{
+ int err = 0;
+ size_t bytes_written = 0;
+ size_t bytes_to_write;
+
+ while (!err) {
+ if ((len - bytes_written) > LARGE_PACKET_DATA_MAX)
+ bytes_to_write = LARGE_PACKET_DATA_MAX;
+ else
+ bytes_to_write = len - bytes_written;
+ if (bytes_to_write == 0)
+ break;
+ err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
+ bytes_written += bytes_to_write;
+ }
+ if (!err)
+ err = packet_flush_gently(fd_out);
+ return err;
+}
+
static int get_packet_data(int fd, char **src_buf, size_t *src_size,
void *dst, unsigned size, int options)
{
ssize_t ret;
if (fd >= 0 && src_buf && *src_buf)
- die("BUG: multiple sources given to packet_read");
+ BUG("multiple sources given to packet_read");
/* Read up to "size" bytes from our source, whatever it is. */
if (src_buf && *src_buf) {
}
/* And complain if we didn't get enough bytes to satisfy the read. */
- if (ret < size) {
+ if (ret != size) {
if (options & PACKET_READ_GENTLE_ON_EOF)
return -1;
return (val < 0) ? val : (val << 8) | hex2chr(linelen + 2);
}
-int packet_read(int fd, char **src_buf, size_t *src_len,
- char *buffer, unsigned size, int options)
+enum packet_read_status packet_read_with_status(int fd, char **src_buffer,
+ size_t *src_len, char *buffer,
+ unsigned size, int *pktlen,
+ int options)
{
- int len, ret;
+ int len;
char linelen[4];
- ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options);
- if (ret < 0)
- return ret;
+ if (get_packet_data(fd, src_buffer, src_len, linelen, 4, options) < 0) {
+ *pktlen = -1;
+ return PACKET_READ_EOF;
+ }
+
len = packet_length(linelen);
- if (len < 0)
+
+ if (len < 0) {
die("protocol error: bad line length character: %.4s", linelen);
- if (!len) {
+ } else if (!len) {
packet_trace("0000", 4, 0);
- return 0;
+ *pktlen = 0;
+ return PACKET_READ_FLUSH;
+ } else if (len == 1) {
+ packet_trace("0001", 4, 0);
+ *pktlen = 0;
+ return PACKET_READ_DELIM;
+ } else if (len < 4) {
+ die("protocol error: bad line length %d", len);
}
+
len -= 4;
- if (len >= size)
+ if ((unsigned)len >= size)
die("protocol error: bad line length %d", len);
- ret = get_packet_data(fd, src_buf, src_len, buffer, len, options);
- if (ret < 0)
- return ret;
+
+ if (get_packet_data(fd, src_buffer, src_len, buffer, len, options) < 0) {
+ *pktlen = -1;
+ return PACKET_READ_EOF;
+ }
if ((options & PACKET_READ_CHOMP_NEWLINE) &&
len && buffer[len-1] == '\n')
buffer[len] = 0;
packet_trace(buffer, len, 0);
- return len;
+ *pktlen = len;
+ return PACKET_READ_NORMAL;
+}
+
+int packet_read(int fd, char **src_buffer, size_t *src_len,
+ char *buffer, unsigned size, int options)
+{
+ int pktlen = -1;
+
+ packet_read_with_status(fd, src_buffer, src_len, buffer, size,
+ &pktlen, options);
+
+ return pktlen;
}
static char *packet_read_line_generic(int fd,
PACKET_READ_CHOMP_NEWLINE);
if (dst_len)
*dst_len = len;
- return len ? packet_buffer : NULL;
+ return (len > 0) ? packet_buffer : NULL;
}
char *packet_read_line(int fd, int *len_p)
return packet_read_line_generic(fd, NULL, NULL, len_p);
}
+int packet_read_line_gently(int fd, int *dst_len, char **dst_line)
+{
+ int len = packet_read(fd, NULL, NULL,
+ packet_buffer, sizeof(packet_buffer),
+ PACKET_READ_CHOMP_NEWLINE|PACKET_READ_GENTLE_ON_EOF);
+ if (dst_len)
+ *dst_len = len;
+ if (dst_line)
+ *dst_line = (len > 0) ? packet_buffer : NULL;
+ return len;
+}
+
char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len)
{
return packet_read_line_generic(-1, src, src_len, dst_len);
}
+
+ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out)
+{
+ int packet_len;
+
+ size_t orig_len = sb_out->len;
+ size_t orig_alloc = sb_out->alloc;
+
+ for (;;) {
+ strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
+ packet_len = packet_read(fd_in, NULL, NULL,
+ /* strbuf_grow() above always allocates one extra byte to
+ * store a '\0' at the end of the string. packet_read()
+ * writes a '\0' extra byte at the end, too. Let it know
+ * that there is already room for the extra byte.
+ */
+ sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1,
+ PACKET_READ_GENTLE_ON_EOF);
+ if (packet_len <= 0)
+ break;
+ sb_out->len += packet_len;
+ }
+
+ if (packet_len < 0) {
+ if (orig_alloc == 0)
+ strbuf_release(sb_out);
+ else
+ strbuf_setlen(sb_out, orig_len);
+ return packet_len;
+ }
+ return sb_out->len - orig_len;
+}
+
+/* Packet Reader Functions */
+void packet_reader_init(struct packet_reader *reader, int fd,
+ char *src_buffer, size_t src_len,
+ int options)
+{
+ memset(reader, 0, sizeof(*reader));
+
+ reader->fd = fd;
+ reader->src_buffer = src_buffer;
+ reader->src_len = src_len;
+ reader->buffer = packet_buffer;
+ reader->buffer_size = sizeof(packet_buffer);
+ reader->options = options;
+}
+
+enum packet_read_status packet_reader_read(struct packet_reader *reader)
+{
+ if (reader->line_peeked) {
+ reader->line_peeked = 0;
+ return reader->status;
+ }
+
+ reader->status = packet_read_with_status(reader->fd,
+ &reader->src_buffer,
+ &reader->src_len,
+ reader->buffer,
+ reader->buffer_size,
+ &reader->pktlen,
+ reader->options);
+
+ if (reader->status == PACKET_READ_NORMAL)
+ reader->line = reader->buffer;
+ else
+ reader->line = NULL;
+
+ return reader->status;
+}
+
+enum packet_read_status packet_reader_peek(struct packet_reader *reader)
+{
+ /* Only allow peeking a single line */
+ if (reader->line_peeked)
+ return reader->status;
+
+ /* Peek a line by reading it and setting peeked flag */
+ packet_reader_read(reader);
+ reader->line_peeked = 1;
+ return reader->status;
+}
projects / platform / upstream / git.git / blobdiff