Split out fastcgi_parse

fastcgi_parse.h

@@ -0,0 +1,43 @@
+#pragma once
+
+struct FastCGIHeader {
+	uint8_t version;
+	uint8_t type;
+  private:
+	uint16_t request_id_; // network byte order
+	uint16_t content_length_; // network byte order
+  public:
+	uint8_t padding_length = 0;
+	uint8_t reserved = 0;
+
+	uint16_t RequestId() const { return ntohs(request_id_); }
+	uint16_t ContentLength() const { return ntohs(content_length_); }
+
+	void SetRequestId(uint16_t request_id) { request_id_ = htons(request_id); }
+	void SetContentLength(uint16_t content_length) { content_length_ = htons(content_length); }
+};
+
+struct FastCGIBeginRequest {
+  private:
+	uint16_t role_; // network byte order
+  public:
+	uint8_t flags;
+	uint8_t reserved[5];
+
+	uint16_t Role() const { return ntohs(role_); }
+};
+
+struct FastCGIEndRequest {
+	uint32_t app_status = htonl(0); // network byte order
+	uint8_t protocol_status;
+	uint8_t reserved[3] = {};
+};
+
+struct FastCGIParamHeader {
+	uint8_t key_length;
+	uint8_t value_length;
+};
+
+constexpr auto fastcgi_max_content_len = 65535;
+constexpr auto fastcgi_max_padding_len = 255;
+constexpr auto fastcgi_max_record_len = sizeof(FastCGIHeader) + fastcgi_max_content_len + fastcgi_max_padding_len;