quickjs-bjson.c

/*
 * QuickJS: binary JSON module (test only)
 *
 * Copyright (c) 2017-2019 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <quickjs-libc.h>
#include "utils.h"
#include "defines.h"
#include "debug.h"

/**
 * \defgroup quickjs-bjson quickjs-bjson: Binary JSON
 * @{
 */

static JSValue
js_bjson_read(JSContext* ctx, JSValueConst this_val, int argc, JSValueConst argv[]) {
  uint8_t* buf;
  uint64_t pos, len;
  JSValue obj;
  size_t size;
  int flags;
  if(!(buf = JS_GetArrayBuffer(ctx, &size, argv[0])))
    return JS_EXCEPTION;
  pos = 0;
  len = size;
  if(argc > 1 && JS_ToIndex(ctx, &pos, argv[1]))
    return JS_EXCEPTION;
  if(argc > 2 && JS_ToIndex(ctx, &len, argv[2]))
    return JS_EXCEPTION;
  if(pos + len > size)
    return JS_ThrowRangeError(ctx, "array buffer overflow");
  flags = 0;
  if(JS_ToBool(ctx, argv[3]))
    flags |= JS_READ_OBJ_REFERENCE;
  obj = JS_ReadObject(ctx, buf + pos, len, flags);
  return obj;
}

static JSValue
js_bjson_write(JSContext* ctx, JSValueConst this_val, int argc, JSValueConst argv[]) {
  size_t len;
  uint8_t* buf;
  JSValue array;
  int flags;

  flags = 0;
  if(JS_ToBool(ctx, argv[1]))
    flags |= JS_WRITE_OBJ_REFERENCE;
  buf = JS_WriteObject(ctx, &len, argv[0], flags);
  if(!buf)
    return JS_EXCEPTION;
  array = JS_NewArrayBufferCopy(ctx, buf, len);
  js_free(ctx, buf);
  return array;
}

static const JSCFunctionListEntry js_bjson_funcs[] = {
    JS_CFUNC_DEF("read", 4, js_bjson_read),
    JS_CFUNC_DEF("write", 2, js_bjson_write),
};

static int
js_bjson_init(JSContext* ctx, JSModuleDef* m) {
  return JS_SetModuleExportList(ctx, m, js_bjson_funcs, countof(js_bjson_funcs));
}

#ifdef JS_SHARED_LIBRARY
#define JS_INIT_MODULE js_init_module
#else
#define JS_INIT_MODULE js_init_module_bjson
#endif

VISIBLE JSModuleDef*
JS_INIT_MODULE(JSContext* ctx, const char* module_name) {
  JSModuleDef* m;

  if((m = JS_NewCModule(ctx, module_name, js_bjson_init))) {
    JS_AddModuleExportList(ctx, m, js_bjson_funcs, countof(js_bjson_funcs));
  }

  return m;
}

/**
 * @}
 */