git.sesse.net Git - cubemap/blob - parse.cpp

   1 #include <ctype.h>
   2 #include <string.h>
   3 #include <string>
   4 #include <vector>
   5
   6 #include "log.h"
   7 #include "parse.h"
   8
   9 using namespace std;
  10
  11 vector<string> split_tokens(const string &line)
  12 {
  13         vector<string> ret;
  14         string current_token;
  15
  16         for (size_t i = 0; i < line.size(); ++i) {
  17                 if (isspace(line[i])) {
  18                         if (!current_token.empty()) {
  19                                 ret.push_back(current_token);
  20                         }
  21                         current_token.clear();
  22                 } else {
  23                         current_token.push_back(line[i]);
  24                 }
  25         }
  26         if (!current_token.empty()) {
  27                 ret.push_back(current_token);
  28         }
  29         return ret;
  30 }
  31
  32 vector<string> split_lines(const string &str)
  33 {
  34         vector<string> ret;
  35         string current_line;
  36
  37         for (size_t i = 0; i < str.size(); ++i) {
  38                 // Skip \r if followed by an \n.
  39                 if (str[i] == '\r' && i < str.size() - 1 && str[i + 1] == '\n') {
  40                         continue;
  41                 }
  42
  43                 // End of the current line?
  44                 if (str[i] == '\n') {
  45                         if (!current_line.empty()) {
  46                                 ret.push_back(current_line);
  47                         }
  48                         current_line.clear();
  49                 } else {
  50                         current_line.push_back(str[i]);
  51                 }
  52         }
  53         if (!current_line.empty()) {
  54                 ret.push_back(current_line);
  55         }
  56         return ret;
  57 }
  58
  59 HTTPHeaderMultimap extract_headers(const vector<string> &lines, const string &log_context)
  60 {
  61         HTTPHeaderMultimap parameters;
  62         for (size_t i = 1; i < lines.size(); ++i) {
  63                 size_t split = lines[i].find(":");
  64                 if (split == string::npos) {
  65                         log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
  66                                 log_context.c_str(), lines[i].c_str());
  67                         continue;
  68                 }
  69
  70                 string key(lines[i].begin(), lines[i].begin() + split);
  71
  72                 // Skip any spaces after the colon.
  73                 do {
  74                         ++split;
  75                 } while (split < lines[i].size() && (lines[i][split] == ' ' || lines[i][split] == '\t'));
  76
  77                 string value(lines[i].begin() + split, lines[i].end());
  78
  79                 parameters.insert(make_pair(key, value));
  80         }
  81
  82         return parameters;
  83 }
  84
  85 #define MAX_REQUEST_SIZE 16384  /* 16 kB. */
  86
  87 RequestParseStatus wait_for_double_newline(string *existing_data, const char *new_data, size_t new_data_size)
  88 {
  89         // Guard against overlong requests gobbling up all of our space.
  90         if (existing_data->size() + new_data_size > MAX_REQUEST_SIZE) {
  91                 return RP_OUT_OF_SPACE;
  92         }
  93
  94         // See if we have \r\n\r\n anywhere in the request. We start three bytes
  95         // before what we just appended, in case we just got the final character.
  96         size_t existing_data_bytes = existing_data->size();
  97         existing_data->append(string(new_data, new_data + new_data_size));
  98
  99         const size_t start_at = (existing_data_bytes >= 3 ? existing_data_bytes - 3 : 0);
 100         const char *ptr = reinterpret_cast<char *>(
 101                 memmem(existing_data->data() + start_at, existing_data->size() - start_at,
 102                        "\r\n\r\n", 4));
 103         if (ptr == nullptr) {
 104                 return RP_NOT_FINISHED_YET;
 105         }
 106         if (ptr != existing_data->data() + existing_data->size() - 4) {
 107                 return RP_EXTRA_DATA;
 108         }
 109         return RP_FINISHED;
 110 }