Copyright (c) 2005 Zed A. Shaw
You can redistribute it and/or modify it under the same terms as Ruby.

include “parser.h” include <stdio.h> include <assert.h> include <stdlib.h> include <ctype.h> include <string.h>

define LEN(AT, FPC) (FPC - buffer - parser->AT) define MARK(M,FPC) (parser->M = (FPC) - buffer) define PTR_TO(F) (buffer + parser->F)

Machine

%%{

machine http_parser;

action mark {MARK(mark, fpc); }

action start_field { MARK(field_start, fpc); }
action write_field { 
  parser->field_len = LEN(field_start, fpc);
}

action start_value { MARK(mark, fpc); }
action write_value { 
  if (parser->http_field != NULL) {
    parser->http_field(parser->data, PTR_TO(field_start), parser->field_len, PTR_TO(mark), LEN(mark, fpc));
  }
}
action request_method { 
  if (parser->request_method != NULL) {
    parser->request_method(parser->data, PTR_TO(mark), LEN(mark, fpc));
  }
}
action request_uri {
  if (parser->request_uri != NULL) {
    parser->request_uri(parser->data, PTR_TO(mark), LEN(mark, fpc));
  }
}
action fragment { 
  if (parser->fragment != NULL) {
    parser->fragment(parser->data, PTR_TO(mark), LEN(mark, fpc));
  }
}

action start_query {MARK(query_start, fpc); }
action query_string { 
  if (parser->query_string != NULL) {
    parser->query_string(parser->data, PTR_TO(query_start), LEN(query_start, fpc));
  }
}

action http_version { 
  if (parser->http_version != NULL) {
    parser->http_version(parser->data, PTR_TO(mark), LEN(mark, fpc));
  }
}

action request_path {
  if (parser->request_path != NULL) {
    parser->request_path(parser->data, PTR_TO(mark), LEN(mark,fpc));
  }
}

action done { 
  parser->body_start = fpc - buffer + 1; 
  if (parser->header_done != NULL) {
    parser->header_done(parser->data, fpc + 1, pe - fpc - 1);
  }
  fbreak;
}

include http_parser_common "common.rl";

}%%

/** Data **/ %% write data;

int thin_http_parser_init(http_parser *parser) {

int cs = 0;
%% write init;
parser->cs = cs;
parser->body_start = 0;
parser->content_len = 0;
parser->mark = 0;
parser->nread = 0;
parser->field_len = 0;
parser->field_start = 0;    

return(1);

}

/** exec **/ size_t thin_http_parser_execute(http_parser *parser, const char *buffer, size_t len, size_t off) {

const char *p, *pe;
int cs = parser->cs;

assert(off <= len && "offset past end of buffer");

p = buffer+off;
pe = buffer+len;

assert(*pe == '\0' && "pointer does not end on NUL");
assert(pe - p == (long)(len - off) && "pointers aren't same distance");

%% write exec;

parser->cs = cs;
parser->nread += p - (buffer + off);

assert(p <= pe && "buffer overflow after parsing execute");
assert(parser->nread <= len && "nread longer than length");
assert(parser->body_start <= len && "body starts after buffer end");
assert(parser->mark < len && "mark is after buffer end");
assert(parser->field_len <= len && "field has length longer than whole buffer");
assert(parser->field_start < len && "field starts after buffer end");

if(parser->body_start) {
  /* final \r\n combo encountered so stop right here */
  parser->nread++;
}

return(parser->nread);

}

int thin_http_parser_has_error(http_parser *parser) {

return parser->cs == http_parser_error;

}

int thin_http_parser_is_finished(http_parser *parser) {

return parser->cs == http_parser_first_final;

}

int thin_http_parser_finish(http_parser *parser) {

int cs = parser->cs;

parser->cs = cs;

if (thin_http_parser_has_error(parser) ) {
  return -1;
} else if (thin_http_parser_is_finished(parser) ) {
  return 1;
} else {
  return 0;
}

}