1 files changed, 119 insertions, 0 deletions
diff --git a/src/lib/istream-rawlog.c b/src/lib/istream-rawlog.c
new file mode 100644
index 0000000..2a44429
--- /dev/null
+++ b/src/lib/istream-rawlog.c
@@ -0,0 +1,119 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ostream.h"
+#include "iostream-rawlog-private.h"
+#include "istream-private.h"
+#include "istream-rawlog.h"
+
+struct rawlog_istream {
+	struct istream_private istream;
+	struct rawlog_iostream riostream;
+};
+
+static void i_stream_rawlog_close(struct iostream_private *stream,
+				  bool close_parent)
+{
+	struct rawlog_istream *rstream =
+		container_of(stream, struct rawlog_istream, istream.iostream);
+
+	iostream_rawlog_close(&rstream->riostream);
+	if (close_parent)
+		i_stream_close(rstream->istream.parent);
+}
+
+static void i_stream_rawlog_destroy(struct iostream_private *stream)
+{
+	struct rawlog_istream *rstream =
+		container_of(stream, struct rawlog_istream, istream.iostream);
+       uoff_t v_offset;
+
+       v_offset = rstream->istream.parent_start_offset +
+               rstream->istream.istream.v_offset;
+       if (rstream->istream.parent->seekable ||
+           v_offset > rstream->istream.parent->v_offset) {
+               /* get to same position in parent stream */
+               i_stream_seek(rstream->istream.parent, v_offset);
+       }
+}
+
+static ssize_t i_stream_rawlog_read(struct istream_private *stream)
+{
+	struct rawlog_istream *rstream =
+		container_of(stream, struct rawlog_istream, istream);
+	ssize_t ret;
+	size_t pos;
+
+	i_stream_seek(stream->parent, rstream->istream.parent_start_offset +
+		      stream->istream.v_offset);
+
+	stream->pos -= stream->skip;
+	stream->skip = 0;
+
+	stream->buffer = i_stream_get_data(stream->parent, &pos);
+	if (pos > stream->pos)
+		ret = 0;
+	else do {
+		ret = i_stream_read_memarea(stream->parent);
+		stream->istream.stream_errno = stream->parent->stream_errno;
+		stream->istream.eof = stream->parent->eof;
+		stream->buffer = i_stream_get_data(stream->parent, &pos);
+	} while (pos <= stream->pos && ret > 0);
+	if (ret == -2)
+		return -2;
+
+	if (pos <= stream->pos)
+		ret = ret == 0 ? 0 : -1;
+	else {
+		ret = (ssize_t)(pos - stream->pos);
+		iostream_rawlog_write(&rstream->riostream,
+				      stream->buffer + stream->pos, ret);
+	}
+	stream->pos = pos;
+	i_assert(ret != -1 || stream->istream.eof ||
+		 stream->istream.stream_errno != 0);
+	return ret;
+}
+
+struct istream *
+i_stream_create_rawlog(struct istream *input, const char *rawlog_path,
+		       int rawlog_fd, enum iostream_rawlog_flags flags)
+{
+	struct ostream *rawlog_output;
+	bool autoclose_fd = (flags & IOSTREAM_RAWLOG_FLAG_AUTOCLOSE) != 0;
+
+	i_assert(rawlog_path != NULL);
+	i_assert(rawlog_fd != -1);
+
+	rawlog_output = autoclose_fd ?
+		o_stream_create_fd_autoclose(&rawlog_fd, 0) :
+		o_stream_create_fd(rawlog_fd, 0);
+	o_stream_set_name(rawlog_output,
+			  t_strdup_printf("rawlog(%s)", rawlog_path));
+	return i_stream_create_rawlog_from_stream(input, rawlog_output, flags);
+}
+
+struct istream *
+i_stream_create_rawlog_from_stream(struct istream *input,
+				   struct ostream *rawlog_output,
+				   enum iostream_rawlog_flags flags)
+{
+	struct rawlog_istream *rstream;
+
+	rstream = i_new(struct rawlog_istream, 1);
+	rstream->istream.max_buffer_size = input->real_stream->max_buffer_size;
+	rstream->istream.stream_size_passthrough = TRUE;
+
+	rstream->riostream.rawlog_output = rawlog_output;
+	iostream_rawlog_init(&rstream->riostream, flags, TRUE);
+
+	rstream->istream.read = i_stream_rawlog_read;
+	rstream->istream.iostream.close = i_stream_rawlog_close;
+	rstream->istream.iostream.destroy = i_stream_rawlog_destroy;
+
+	rstream->istream.istream.readable_fd = input->readable_fd;
+	rstream->istream.istream.blocking = input->blocking;
+	rstream->istream.istream.seekable = input->seekable;
+	return i_stream_create(&rstream->istream, input,
+			       i_stream_get_fd(input), 0);
+}