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POST multipart parser: minor improvements and fixes

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This commit is contained in:
Evgeny Grin (Karlson2k)
2024-09-03 12:27:25 +02:00
parent 4b6065c846
commit 0ecd6da1f9
1 changed files with 23 additions and 12 deletions
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src/mhd2/post_parser_funcs.c
+23 -12
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@@ -1438,12 +1438,10 @@ parse_post_mpart (struct MHD_Connection *restrict c,
{
case mhd_POST_MPART_ST_BACK_TO_PREAMBL:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mf->delim_check_start = mhd_POST_INVALID_POS;
mf->line_start = mhd_POST_INVALID_POS;
mf->st = mhd_POST_MPART_ST_PREAMBL;
/* Intentional fall-through */
case mhd_POST_MPART_ST_PREAMBL:
mhd_assert (0 == p_data->field_start);
mhd_assert (0 == p_data->value_off);
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS == mf->line_start);
@@ -1475,23 +1473,22 @@ parse_post_mpart (struct MHD_Connection *restrict c,
++i;
}
else
{
mf->delim_check_start = mhd_POST_INVALID_POS;
mf->st = mhd_POST_MPART_ST_PREAMBL;
}
continue;
case mhd_POST_MPART_ST_NOT_STARTED:
mhd_assert (0 == p_data->field_start);
mhd_assert (0 == p_data->value_off);
mf->delim_check_start = i;
mf->delim_check_start = mhd_POST_INVALID_POS; /* Ignored for first delimiter */
p_data->field_start = i;
/* Intentional fall-through */
case mhd_POST_MPART_ST_PREAMBL_LINE_START:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS == mf->line_start);
mf->line_start = i;
mf->st = mhd_POST_MPART_ST_PREAMBL_CHECKING_FOR_DELIM;
/* Intentional fall-through */
case mhd_POST_MPART_ST_PREAMBL_CHECKING_FOR_DELIM:
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start); /* Ignored for first delimiter */
mhd_assert (i >= mf->line_start);
do /* Fast local loop */
{
@@ -1524,7 +1521,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
(mhd_POST_MPART_ST_BACK_TO_PREAMBL == mf->st));
continue;
case mhd_POST_MPART_ST_FIRST_DELIM_FOUND:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start); /* Ignored for first delimiter */
mhd_assert (mhd_POST_INVALID_POS != mf->line_start);
mhd_assert (i >= mf->line_start + mf->bound.size + 2);
do /* Fast local loop */
@@ -1561,6 +1558,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
(mhd_POST_MPART_ST_EPILOGUE == mf->st));
continue;
case mhd_POST_MPART_ST_FIRST_PART_START:
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start); /* Ignored for first delimiter */
mhd_assert (i > p_data->field_start);
mhd_assert (*pdata_size > i);
if ((c->rq.app_act.head_act.data.post_parse.max_nonstream_size <
@@ -1573,12 +1571,13 @@ parse_post_mpart (struct MHD_Connection *restrict c,
*pdata_size - i);
*pdata_size -= (i - p_data->field_start);
i = p_data->field_start;
mf->delim_check_start = p_data->field_start;
}
mf->delim_check_start = p_data->field_start;
/* Intentional fall-through */
case mhd_POST_MPART_ST_PART_START:
mhd_assert (0 == mf->f.name_len);
mhd_assert (0 == p_data->value_off);
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
p_data->field_start = mf->delim_check_start;
mf->delim_check_start = mhd_POST_INVALID_POS;
/* Intentional fall-through */
@@ -1589,6 +1588,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
case mhd_POST_MPART_ST_HEADER_LINE:
mhd_assert (i >= mf->line_start);
mhd_assert (mhd_POST_INVALID_POS != mf->line_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
do /* Fast local loop */
{
if ('\r' == buf[i])
@@ -1609,12 +1609,14 @@ parse_post_mpart (struct MHD_Connection *restrict c,
{
if (('-' == buf[mf->line_start]) &&
('-' == buf[mf->line_start + 1]) &&
(0 == memcmp (buf + mf->line_start + 1,
(0 == memcmp (buf + mf->line_start + 2,
mf->bound.data,
mf->bound.size)))
{
/* The delimiter before the end of the header */
if (! bare_lf_as_crlf)
if (2 > mf->line_start)
mf->delim_check_start = mf->line_start;
else if (! bare_lf_as_crlf)
mf->delim_check_start = mf->line_start - 2;
else
mf->delim_check_start = mf->line_start - 1; /* Actually can be one char earlier */
@@ -1638,6 +1640,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
mf->st = mhd_POST_MPART_ST_HEADER_LINE_END;
/* Intentional fall-through */
case mhd_POST_MPART_ST_HEADER_LINE_END:
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mhd_assert (i >= mf->line_start);
mhd_assert (mhd_POST_INVALID_POS != mf->line_start);
if (1)
@@ -1820,6 +1823,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
continue;
case mhd_POST_MPART_ST_VALUE_START:
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mhd_assert (0 == p_data->value_off);
mhd_assert (0 == mf->f.value_idx);
mhd_assert (0 == mf->f.value_len);
@@ -1844,6 +1848,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
mf->f.value_idx = i;
/* Intentional fall-through */
case mhd_POST_MPART_ST_BACK_TO_VALUE:
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mf->line_start = mhd_POST_INVALID_POS;
mf->delim_check_start = mhd_POST_INVALID_POS;
mf->st = mhd_POST_MPART_ST_VALUE;
@@ -1851,6 +1856,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
case mhd_POST_MPART_ST_VALUE:
mhd_assert (mhd_POST_INVALID_POS == mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS == mf->line_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
do /* Fast local loop */
{
if ('\r' == buf[i])
@@ -1883,10 +1889,12 @@ parse_post_mpart (struct MHD_Connection *restrict c,
continue;
case mhd_POST_MPART_ST_VALUE_LINE_START:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mf->line_start = i;
mf->st = mhd_POST_MPART_ST_VALUE_CHECKING_FOR_DELIM;
/* Intentional fall-through */
case mhd_POST_MPART_ST_VALUE_CHECKING_FOR_DELIM:
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mhd_assert (i >= mf->line_start);
do /* Fast local loop */
{
@@ -1921,6 +1929,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
case mhd_POST_MPART_ST_DELIM_FOUND:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS != mf->line_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mhd_assert (i >= mf->line_start + mf->bound.size + 2);
do /* Fast local loop */
{
@@ -1955,6 +1964,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
case mhd_POST_MPART_ST_VALUE_END_FOUND:
case mhd_POST_MPART_ST_VALUE_END_FOUND_FINAL:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
mhd_assert (mf->f.value_idx <= mf->delim_check_start);
mhd_assert (0 == mf->f.value_len);
mhd_assert (0 != mf->f.name_len);
@@ -1964,7 +1974,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
{
mf->f.value_len = mf->delim_check_start - mf->f.value_idx;
buf[mf->f.value_idx + mf->f.value_len] = 0; /* Zero-terminate the value */
++mf->delim_check_start; /* Shift start of the delimiter to keep zero-termination */
++mf->delim_check_start; /* Shift start of the delimiter to add space for zero-termination */
}
if (mhd_POST_MPART_ST_VALUE_END_FOUND == mf->st)
mf->st = mhd_POST_MPART_ST_FULL_FIELD_FOUND;
@@ -1974,6 +1984,7 @@ parse_post_mpart (struct MHD_Connection *restrict c,
case mhd_POST_MPART_ST_FULL_FIELD_FOUND:
case mhd_POST_MPART_ST_FULL_FIELD_FOUND_FINAL:
mhd_assert (mhd_POST_INVALID_POS != mf->delim_check_start);
mhd_assert (mhd_POST_INVALID_POS != p_data->field_start);
if (1)
{
size_t new_delim_check_start;