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/*
This file is part of libmicrohttpd
Copyright (C) 2007-2022 Daniel Pittman, Christian Grothoff, and Evgeny Grin
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file postprocessor.h
* @brief Declarations for parsing POST data
* @author Christian Grothoff
* @author Karlson2k (Evgeny Grin)
*/
#ifndef MHD_POSTPROCESSOR_H
#define MHD_POSTPROCESSOR_H 1
#include "internal.h"
/**
* States in the PP parser's state machine.
*/
enum PP_State
{
/* general states */
PP_Error,
PP_Done,
PP_Init,
PP_NextBoundary,
/* url encoding-states */
PP_ProcessKey,
PP_ProcessValue,
PP_Callback,
/* post encoding-states */
PP_ProcessEntryHeaders,
PP_PerformCheckMultipart,
PP_ProcessValueToBoundary,
PP_PerformCleanup,
/* nested post-encoding states */
PP_Nested_Init,
PP_Nested_PerformMarking,
PP_Nested_ProcessEntryHeaders,
PP_Nested_ProcessValueToBoundary,
PP_Nested_PerformCleanup
};
enum RN_State
{
/**
* No RN-preprocessing in this state.
*/
RN_Inactive = 0,
/**
* If the next character is CR, skip it. Otherwise,
* just go inactive.
*/
RN_OptN = 1,
/**
* Expect CRLF (and only CRLF). As always, we also
* expect only LF or only CR.
*/
RN_Full = 2,
/**
* Expect either CRLF or '--'CRLF. If '--'CRLF, transition into dash-state
* for the main state machine
*/
RN_Dash = 3,
/**
* Got a single dash, expect second dash.
*/
RN_Dash2 = 4
};
/**
* Bits for the globally known fields that
* should not be deleted when we exit the
* nested state.
*/
enum NE_State
{
NE_none = 0,
NE_content_name = 1,
NE_content_type = 2,
NE_content_filename = 4,
NE_content_transfer_encoding = 8
};
/**
* Internal state of the post-processor. Note that the fields
* are sorted by type to enable optimal packing by the compiler.
*/
struct MHD_PostProcessor
{
/**
* The connection for which we are doing
* POST processing.
*/
struct MHD_Connection *connection;
/**
* Function to call with POST data.
*/
MHD_PostDataIterator ikvi;
/**
* Extra argument to ikvi.
*/
void *cls;
/**
* Encoding as given by the headers of the connection.
*/
const char *encoding;
/**
* Primary boundary (points into encoding string)
*/
const char *boundary;
/**
* Nested boundary (if we have multipart/mixed encoding).
*/
char *nested_boundary;
/**
* Pointer to the name given in disposition.
*/
char *content_name;
/**
* Pointer to the (current) content type.
*/
char *content_type;
/**
* Pointer to the (current) filename.
*/
char *content_filename;
/**
* Pointer to the (current) encoding.
*/
char *content_transfer_encoding;
/**
* Value data left over from previous iteration.
*/
char xbuf[2];
/**
* Size of our buffer for the key.
*/
size_t buffer_size;
/**
* Current position in the key buffer.
*/
size_t buffer_pos;
/**
* Current position in @e xbuf.
*/
size_t xbuf_pos;
/**
* Current offset in the value being processed.
*/
uint64_t value_offset;
/**
* strlen(boundary) -- if boundary != NULL.
*/
size_t blen;
/**
* strlen(nested_boundary) -- if nested_boundary != NULL.
*/
size_t nlen;
/**
* Do we have to call the 'ikvi' callback when processing the
* multipart post body even if the size of the payload is zero?
* Set to #MHD_YES whenever we parse a new multiparty entry header,
* and to #MHD_NO the first time we call the 'ikvi' callback.
* Used to ensure that we do always call 'ikvi' even if the
* payload is empty (but not more than once).
*/
bool must_ikvi;
/**
* Set if we still need to run the unescape logic
* on the key allocated at the end of this struct.
*/
bool must_unescape_key;
/**
* State of the parser.
*/
enum PP_State state;
/**
* Side-state-machine: skip CRLF (or just LF).
* Set to 0 if we are not in skip mode. Set to 2
* if a CRLF is expected, set to 1 if a CR should
* be skipped if it is the next character.
*/
enum RN_State skip_rn;
/**
* If we are in skip_rn with "dash" mode and
* do find 2 dashes, what state do we go into?
*/
enum PP_State dash_state;
/**
* Which headers are global? (used to tell which
* headers were only valid for the nested multipart).
*/
enum NE_State have;
};
#endif /* ! MHD_POSTPROCESSOR_H */
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