1 files changed, 106 insertions, 0 deletions
diff --git a/llhttp/src/llhttp/c-headers.ts b/llhttp/src/llhttp/c-headers.ts
new file mode 100644
index 0000000..fad66de
--- /dev/null
+++ b/llhttp/src/llhttp/c-headers.ts
@@ -0,0 +1,106 @@
+import * as constants from './constants';
+import { enumToMap, IEnumMap } from './utils';
+
+type Encoding = 'none' | 'hex';
+
+export class CHeaders {
+  public build(): string {
+    let res = '';
+
+    res += '#ifndef LLLLHTTP_C_HEADERS_\n';
+    res += '#define LLLLHTTP_C_HEADERS_\n';
+
+    res += '#ifdef __cplusplus\n';
+    res += 'extern "C" {\n';
+    res += '#endif\n';
+
+    res += '\n';
+
+    const errorMap = enumToMap(constants.ERROR);
+    const methodMap = enumToMap(constants.METHODS);
+    const httpMethodMap = enumToMap(constants.METHODS, constants.METHODS_HTTP, [
+      constants.METHODS.PRI,
+    ]);
+    const rtspMethodMap = enumToMap(constants.METHODS, constants.METHODS_RTSP);
+    const statusMap = enumToMap(constants.STATUSES, constants.STATUSES_HTTP);
+
+    res += this.buildEnum('llhttp_errno', 'HPE', errorMap);
+    res += '\n';
+    res += this.buildEnum('llhttp_flags', 'F', enumToMap(constants.FLAGS),
+      'hex');
+    res += '\n';
+    res += this.buildEnum('llhttp_lenient_flags', 'LENIENT',
+      enumToMap(constants.LENIENT_FLAGS), 'hex');
+    res += '\n';
+    res += this.buildEnum('llhttp_type', 'HTTP',
+      enumToMap(constants.TYPE));
+    res += '\n';
+    res += this.buildEnum('llhttp_finish', 'HTTP_FINISH',
+      enumToMap(constants.FINISH));
+    res += '\n';
+    res += this.buildEnum('llhttp_method', 'HTTP', methodMap);
+    res += '\n';
+    res += this.buildEnum('llhttp_status', 'HTTP_STATUS', statusMap);
+
+    res += '\n';
+
+    res += this.buildMap('HTTP_ERRNO', errorMap);
+    res += '\n';
+    res += this.buildMap('HTTP_METHOD', httpMethodMap);
+    res += '\n';
+    res += this.buildMap('RTSP_METHOD', rtspMethodMap);
+    res += '\n';
+    res += this.buildMap('HTTP_ALL_METHOD', methodMap);
+    res += '\n';
+    res += this.buildMap('HTTP_STATUS', statusMap);
+
+    res += '\n';
+
+    res += '#ifdef __cplusplus\n';
+    res += '}  /* extern "C" */\n';
+    res += '#endif\n';
+    res += '#endif  /* LLLLHTTP_C_HEADERS_ */\n';
+
+    return res;
+  }
+
+  private buildEnum(name: string, prefix: string, map: IEnumMap,
+                    encoding: Encoding = 'none'): string {
+    let res = '';
+
+    res += `enum ${name} {\n`;
+    const keys = Object.keys(map);
+    const keysLength = keys.length;
+    for (let i = 0; i < keysLength; i++) {
+      const key = keys[i];
+      const isLast = i === keysLength - 1;
+
+      let value: number | string = map[key];
+
+      if (encoding === 'hex') {
+        value = `0x${value.toString(16)}`;
+      }
+
+      res += `  ${prefix}_${key.replace(/-/g, '')} = ${value}`;
+      if (!isLast) {
+        res += ',\n';
+      }
+    }
+    res += '\n};\n';
+    res += `typedef enum ${name} ${name}_t;\n`;
+
+    return res;
+  }
+
+  private buildMap(name: string, map: IEnumMap): string {
+    let res = '';
+
+    res += `#define ${name}_MAP(XX) \\\n`;
+    for (const [key, value] of Object.entries(map)) {
+      res += `  XX(${value!}, ${key.replace(/-/g, '')}, ${key}) \\\n`;
+    }
+    res += '\n';
+
+    return res;
+  }
+}