From 0441d265f2bb9da249c7abf333f0f771fadb4ab5 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 15 Apr 2024 19:36:47 +0200
Subject: Adding upstream version 1:2.3.21+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/lib-mail/message-size.c | 174 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 174 insertions(+)
 create mode 100644 src/lib-mail/message-size.c

(limited to 'src/lib-mail/message-size.c')

diff --git a/src/lib-mail/message-size.c b/src/lib-mail/message-size.c
new file mode 100644
index 0000000..472abeb
--- /dev/null
+++ b/src/lib-mail/message-size.c
@@ -0,0 +1,174 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "message-parser.h"
+#include "message-size.h"
+
+int message_get_header_size(struct istream *input, struct message_size *hdr,
+			    bool *has_nuls_r)
+{
+	const unsigned char *msg;
+	size_t i, size, startpos, missing_cr_count;
+	int ret;
+
+	memset(hdr, 0, sizeof(struct message_size));
+	*has_nuls_r = FALSE;
+
+	missing_cr_count = 0; startpos = 0;
+	while ((ret = i_stream_read_bytes(input, &msg, &size, startpos + 1)) > 0) {
+		for (i = startpos; i < size; i++) {
+			if (msg[i] != '\n') {
+				if (msg[i] == '\0')
+					*has_nuls_r = TRUE;
+				continue;
+			}
+
+			hdr->lines++;
+			if (i == 0 || msg[i-1] != '\r') {
+				/* missing CR */
+				missing_cr_count++;
+			}
+
+			if (i == 0 || (i == 1 && msg[i-1] == '\r')) {
+				/* no headers at all */
+				break;
+			}
+
+			if ((i > 0 && msg[i-1] == '\n') ||
+			    (i > 1 && msg[i-2] == '\n' && msg[i-1] == '\r')) {
+				/* \n\n or \n\r\n - end of headers */
+				break;
+			}
+		}
+
+		if (i < size) {
+			/* end of header */
+			startpos = i+1;
+			break;
+		}
+
+		/* leave the last two characters, they may be \r\n */
+		startpos = size == 1 ? 1 : 2;
+		i_stream_skip(input, i - startpos);
+
+		hdr->physical_size += i - startpos;
+	}
+	i_assert(ret == -1 || ret > 0);
+
+	ret = input->stream_errno != 0 ? -1 : 0;
+	i_stream_skip(input, startpos);
+	hdr->physical_size += startpos;
+
+	hdr->virtual_size = hdr->physical_size + missing_cr_count;
+	i_assert(hdr->virtual_size >= hdr->physical_size);
+	return ret;
+}
+
+int message_get_body_size(struct istream *input, struct message_size *body,
+			  bool *has_nuls_r)
+{
+	const unsigned char *msg;
+	size_t i, size, missing_cr_count;
+	int ret;
+
+	memset(body, 0, sizeof(struct message_size));
+	*has_nuls_r = FALSE;
+
+	missing_cr_count = 0;
+	if ((ret = i_stream_read_more(input, &msg, &size)) <= 0) {
+		i_assert(ret == -1);
+		return ret < 0 && input->stream_errno != 0 ? -1 : 0;
+	}
+
+	if (msg[0] == '\n')
+		missing_cr_count++;
+
+	do {
+		for (i = 1; i < size; i++) {
+			if (msg[i] > '\n')
+				continue;
+
+			if (msg[i] == '\n') {
+				if (msg[i-1] != '\r') {
+					/* missing CR */
+					missing_cr_count++;
+				}
+
+				/* increase after making sure we didn't break
+				   at virtual \r */
+				body->lines++;
+			} else if (msg[i] == '\0') {
+				*has_nuls_r = TRUE;
+			}
+		}
+
+		/* leave the last character, it may be \r */
+		i_stream_skip(input, i - 1);
+		body->physical_size += i - 1;
+	} while ((ret = i_stream_read_bytes(input, &msg, &size, 2)) > 0);
+	i_assert(ret == -1);
+
+	ret = input->stream_errno != 0 ? -1 : 0;
+
+	i_stream_skip(input, 1);
+	body->physical_size++;
+
+	body->virtual_size = body->physical_size + missing_cr_count;
+	i_assert(body->virtual_size >= body->physical_size);
+	return ret;
+}
+
+void message_size_add(struct message_size *dest,
+		      const struct message_size *src)
+{
+	dest->virtual_size += src->virtual_size;
+	dest->physical_size += src->physical_size;
+	dest->lines += src->lines;
+}
+
+int message_skip_virtual(struct istream *input, uoff_t virtual_skip,
+			 bool *last_cr_r)
+{
+	const unsigned char *msg;
+	size_t i, size;
+	bool cr_skipped = FALSE;
+	int ret;
+
+	*last_cr_r = FALSE;
+	if (virtual_skip == 0)
+		return 0;
+
+	while ((ret = i_stream_read_more(input, &msg, &size)) > 0) {
+		for (i = 0; i < size && virtual_skip > 0; i++) {
+			virtual_skip--;
+
+			if (msg[i] == '\r') {
+				/* CR */
+				if (virtual_skip == 0)
+					*last_cr_r = TRUE;
+			} else if (msg[i] == '\n') {
+				/* LF */
+				if ((i == 0 && !cr_skipped) ||
+				    (i > 0 && msg[i-1] != '\r')) {
+					if (virtual_skip == 0) {
+						/* CR/LF boundary */
+						*last_cr_r = TRUE;
+						break;
+					}
+
+					virtual_skip--;
+				}
+			}
+		}
+		i_stream_skip(input, i);
+
+		if (i < size)
+			return 0;
+
+		i_assert(i > 0);
+		cr_skipped = msg[i-1] == '\r';
+	}
+	i_assert(ret == -1);
+	return input->stream_errno == 0 ? 0 : -1;
+}
-- 
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