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/* 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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