HttpLineReader.h

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#pragma once
 
#include "AudioLogger.h"
 
namespace audio_tools {
 
class HttpLineReader {
 public:
  HttpLineReader() {}
  // reads up the the next CR LF - but never more then the indicated len.
  // returns the number of characters read including crlf
  virtual int readlnInternal(Stream& client, uint8_t* str, int len,
                             bool incl_nl = true) {
    int result = 0;
    LOGD("HttpLineReader %s", "readlnInternal");
    // wait for first character
    for (int w = 0; w < 200 && client.available() == 0; w++) {
      delay(10);
    }
    // if we do not have any data we stop
    if (client.available() == 0) {
      LOGW("HttpLineReader %s", "readlnInternal->no Data");
      str[0] = 0;
      return 0;
    }
 
    // process characters until we find a new line
    bool is_buffer_overflow = false;
    int j = 0;
    while (true) {
      int c = client.read();
      if (c == -1) {
        break;
      }
 
      if (j < len) {
        result++;
      } else {
        is_buffer_overflow = true;
      }
 
      if (c == '\n') {
        if (incl_nl) {
          str[j] = c;
          break;
        } else {
          // remove cr lf
          if (j >= 1) {
            if (str[j - 1] == '\r') {
              // remove cr
              str[j - 1] = 0;
              break;
            } else {
              // remove nl
              str[j] = 0;
              break;
            }
          }
        }
      }
      if (!is_buffer_overflow) {
        str[j] = c;
      }
      j++;
    }
    str[result - 1] = 0;
    if (is_buffer_overflow) {
      LOGE("HttpLineReader %s", "readlnInternal->cut off too long line");
    }
 
    return result;
  }
};
 
}  // namespace audio_tools