File: chat-websocket/node_modules/socket.io/node_modules/socket.io-client/node_modules/ws/src/validation.cc

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File: chat-websocket/node_modules/socket.io/node_modules/socket.io-client/node_modules/ws/src/validation.cc
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/*! * ws: a node.js websocket client * Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com> * MIT Licensed */ #include <v8.h> #include <node.h> #include <node_buffer.h> #include <node_object_wrap.h> #include <stdlib.h> #include <wchar.h> #include <stdio.h> using namespace v8; using namespace node; #define UNI_SUR_HIGH_START (uint32_t) 0xD800 #define UNI_SUR_LOW_END (uint32_t) 0xDFFF #define UNI_REPLACEMENT_CHAR (uint32_t) 0x0000FFFD #define UNI_MAX_LEGAL_UTF32 (uint32_t) 0x0010FFFF static const uint8_t trailingBytesForUTF8[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 }; static const uint32_t offsetsFromUTF8[6] = { 0x00000000, 0x00003080, 0x000E2080, 0x03C82080, 0xFA082080, 0x82082080 }; static int isLegalUTF8(const uint8_t *source, const int length) { uint8_t a; const uint8_t *srcptr = source+length; switch (length) { default: return 0; /* Everything else falls through when "true"... */ /* RFC3629 makes 5 & 6 bytes UTF-8 illegal case 6: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return 0; case 5: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return 0; */ case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return 0; case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return 0; case 2: if ((a = (*--srcptr)) > 0xBF) return 0; switch (*source) { /* no fall-through in this inner switch */ case 0xE0: if (a < 0xA0) return 0; break; case 0xED: if (a > 0x9F) return 0; break; case 0xF0: if (a < 0x90) return 0; break; case 0xF4: if (a > 0x8F) return 0; break; default: if (a < 0x80) return 0; } case 1: if (*source >= 0x80 && *source < 0xC2) return 0; } if (*source > 0xF4) return 0; return 1; } int is_valid_utf8 (size_t len, char *value) { /* is the string valid UTF-8? */ for (unsigned int i = 0; i < len; i++) { uint32_t ch = 0; uint8_t extrabytes = trailingBytesForUTF8[(uint8_t) value[i]]; if (extrabytes + i >= len) return 0; if (isLegalUTF8 ((uint8_t *) (value + i), extrabytes + 1) == 0) return 0; switch (extrabytes) { case 5 : ch += (uint8_t) value[i++]; ch <<= 6; case 4 : ch += (uint8_t) value[i++]; ch <<= 6; case 3 : ch += (uint8_t) value[i++]; ch <<= 6; case 2 : ch += (uint8_t) value[i++]; ch <<= 6; case 1 : ch += (uint8_t) value[i++]; ch <<= 6; case 0 : ch += (uint8_t) value[i]; } ch -= offsetsFromUTF8[extrabytes]; if (ch <= UNI_MAX_LEGAL_UTF32) { if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) return 0; } else { return 0; } } return 1; } class Validation : public ObjectWrap { public: static void Initialize(v8::Handle<v8::Object> target) { HandleScope scope; Local<FunctionTemplate> t = FunctionTemplate::New(New); t->InstanceTemplate()->SetInternalFieldCount(1); NODE_SET_METHOD(t->GetFunction(), "isValidUTF8", Validation::IsValidUTF8); target->Set(String::NewSymbol("Validation"), t->GetFunction()); } protected: static Handle<Value> New(const Arguments& args) { HandleScope scope; Validation* validation = new Validation(); validation->Wrap(args.This()); return args.This(); } static Handle<Value> IsValidUTF8(const Arguments& args) { HandleScope scope; if (!Buffer::HasInstance(args[0])) { return ThrowException(Exception::Error(String::New("First argument needs to be a buffer"))); } Local<Object> buffer_obj = args[0]->ToObject(); char *buffer_data = Buffer::Data(buffer_obj); size_t buffer_length = Buffer::Length(buffer_obj); return is_valid_utf8(buffer_length, buffer_data) == 1 ? scope.Close(True()) : scope.Close(False()); } }; extern "C" void init (Handle<Object> target) { HandleScope scope; Validation::Initialize(target); } NODE_MODULE(validation, init)