#include <stdio.h>
#include <stdlib.h>
#include <microhttpd.h>

enum PP_State
{
  PP_Error,
  PP_Done,
  PP_Init,
  PP_NextBoundary,
  PP_ProcessValue,
  PP_Callback,
  PP_ExpectNewLine,
  PP_ProcessEntryHeaders,
  PP_PerformCheckMultipart,
  PP_ProcessValueToBoundary,
  PP_PerformCleanup,
  PP_Nested_Init,
  PP_Nested_PerformMarking,
  PP_Nested_ProcessEntryHeaders,
  PP_Nested_ProcessValueToBoundary,
  PP_Nested_PerformCleanup
};
enum RN_State
{
  RN_Inactive = 0,
  RN_OptN = 1,
  RN_Full = 2,
  RN_Dash = 3,
  RN_Dash2 = 4
};
enum NE_State
{
  NE_none = 0,
  NE_content_name = 1,
  NE_content_type = 2,
  NE_content_filename = 4,
  NE_content_transfer_encoding = 8
};
struct MHD_PostProcessor
{
    struct MHD_Connection *connection;
    MHD_PostDataIterator ikvi;
    void *cls;
    const char *encoding;
    const char *boundary;
    char *nested_boundary;
    char *content_name;
    char *content_type;
    char *content_filename;
    char *content_transfer_encoding;
    char xbuf[2];
    size_t buffer_size;
    size_t buffer_pos;
    size_t xbuf_pos;
    uint64_t value_offset;
    size_t blen;
    size_t nlen;
    bool must_ikvi;
    bool must_unescape_key;
    enum PP_State state;
    enum RN_State skip_rn;
    enum PP_State dash_state;
    enum NE_State have;
};
static int post_data_iterator( void *cls, enum MHD_ValueKind kind, const char *key, const char *filename, const char *content_type,
                               const char *transfer_encoding, const char *data, uint64_t off, size_t size )
{
    printf("%s\t%s\n", key, data );
    return MHD_YES;
}
int main( int argc, char *argv[] )
{
    struct MHD_PostProcessor *postprocessor = (struct MHD_PostProcessor *)calloc(1, sizeof(struct MHD_PostProcessor) + 0x1000+1);
    postprocessor->connection = nullptr;
    postprocessor->ikvi = post_data_iterator;
    postprocessor->cls = nullptr;
    postprocessor->encoding = MHD_HTTP_POST_ENCODING_FORM_URLENCODED;
    postprocessor->buffer_size = 0x1000;
    postprocessor->state = PP_Init;
    postprocessor->blen = 0;
    postprocessor->boundary = nullptr;
    postprocessor->skip_rn = RN_Inactive;
    MHD_post_process( postprocessor, "xxxx=xxxx", 9 );
    MHD_post_process( postprocessor, "&yyyy=yyyy&zzzz=&aaaa=", 22 );
    MHD_post_process( postprocessor, "", 0 );

    return EXIT_SUCCESS;
}