1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22#ifndef SRC_STRING_BYTES_H_ 23#define SRC_STRING_BYTES_H_ 24 25#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS 26 27// Decodes a v8::Local<v8::String> or Buffer to a raw char* 28 29#include "v8.h" 30#include "env-inl.h" 31 32#include <string> 33 34namespace node { 35 36class StringBytes { 37 public: 38 class InlineDecoder : public MaybeStackBuffer<char> { 39 public: 40 inline v8::Maybe<bool> Decode(Environment* env, 41 v8::Local<v8::String> string, 42 enum encoding enc) { 43 size_t storage; 44 if (!StringBytes::StorageSize(env->isolate(), string, enc).To(&storage)) 45 return v8::Nothing<bool>(); 46 AllocateSufficientStorage(storage); 47 const size_t length = 48 StringBytes::Write(env->isolate(), out(), storage, string, enc); 49 50 // No zero terminator is included when using this method. 51 SetLength(length); 52 return v8::Just(true); 53 } 54 55 inline size_t size() const { return length(); } 56 }; 57 58 // Fast, but can be 2 bytes oversized for Base64, and 59 // as much as triple UTF-8 strings <= 65536 chars in length 60 static v8::Maybe<size_t> StorageSize(v8::Isolate* isolate, 61 v8::Local<v8::Value> val, 62 enum encoding enc); 63 64 // Precise byte count, but slightly slower for Base64 and 65 // very much slower for UTF-8 66 static v8::Maybe<size_t> Size(v8::Isolate* isolate, 67 v8::Local<v8::Value> val, 68 enum encoding enc); 69 70 // Write the bytes from the string or buffer into the char* 71 // returns the number of bytes written, which will always be 72 // <= buflen. Use StorageSize/Size first to know how much 73 // memory to allocate. 74 static size_t Write(v8::Isolate* isolate, 75 char* buf, 76 size_t buflen, 77 v8::Local<v8::Value> val, 78 enum encoding enc); 79 80 // Take the bytes in the src, and turn it into a Buffer or String. 81 static v8::MaybeLocal<v8::Value> Encode(v8::Isolate* isolate, 82 const char* buf, 83 size_t buflen, 84 enum encoding encoding, 85 v8::Local<v8::Value>* error); 86 87 // Warning: This reverses endianness on BE platforms, even though the 88 // signature using uint16_t implies that it should not. 89 // However, the brokenness is already public API and can't therefore 90 // be changed easily. 91 static v8::MaybeLocal<v8::Value> Encode(v8::Isolate* isolate, 92 const uint16_t* buf, 93 size_t buflen, 94 v8::Local<v8::Value>* error); 95 96 static v8::MaybeLocal<v8::Value> Encode(v8::Isolate* isolate, 97 const char* buf, 98 enum encoding encoding, 99 v8::Local<v8::Value>* error); 100 101 static size_t hex_encode(const char* src, 102 size_t slen, 103 char* dst, 104 size_t dlen); 105 106 static std::string hex_encode(const char* src, size_t slen); 107 108 private: 109 static size_t WriteUCS2(v8::Isolate* isolate, 110 char* buf, 111 size_t buflen, 112 v8::Local<v8::String> str, 113 int flags); 114}; 115 116} // namespace node 117 118#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS 119 120#endif // SRC_STRING_BYTES_H_ 121