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#ifndef SRC_STRING_BYTES_H_
#define SRC_STRING_BYTES_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
// Decodes a v8::Local<v8::String> or Buffer to a raw char*
#include "v8.h"
#include "node.h"
#include "env.h"
#include "env-inl.h"
#include "util.h"
namespace node {
class StringBytes {
public:
class InlineDecoder : public MaybeStackBuffer<char> {
public:
inline bool Decode(Environment* env,
v8::Local<v8::String> string,
v8::Local<v8::Value> encoding,
enum encoding _default) {
enum encoding enc = ParseEncoding(env->isolate(), encoding, _default);
if (!StringBytes::IsValidString(env->isolate(), string, enc)) {
env->ThrowTypeError("Bad input string");
return false;
}
const size_t storage = StringBytes::StorageSize(env->isolate(),
string,
enc);
AllocateSufficientStorage(storage);
const size_t length = StringBytes::Write(env->isolate(),
out(),
storage,
string,
enc);
// No zero terminator is included when using this method.
SetLength(length);
return true;
}
inline size_t size() const { return length(); }
};
// Does the string match the encoding? Quick but non-exhaustive.
// Example: a HEX string must have a length that's a multiple of two.
// FIXME(bnoordhuis) IsMaybeValidString()? Naming things is hard...
static bool IsValidString(v8::Isolate* isolate,
v8::Local<v8::String> string,
enum encoding enc);
// Fast, but can be 2 bytes oversized for Base64, and
// as much as triple UTF-8 strings <= 65536 chars in length
static size_t StorageSize(v8::Isolate* isolate,
v8::Local<v8::Value> val,
enum encoding enc);
// Precise byte count, but slightly slower for Base64 and
// very much slower for UTF-8
static size_t Size(v8::Isolate* isolate,
v8::Local<v8::Value> val,
enum encoding enc);
// If the string is external then assign external properties to data and len,
// then return true. If not return false.
static bool GetExternalParts(v8::Isolate* isolate,
v8::Local<v8::Value> val,
const char** data,
size_t* len);
// Write the bytes from the string or buffer into the char*
// returns the number of bytes written, which will always be
// <= buflen. Use StorageSize/Size first to know how much
// memory to allocate.
static size_t Write(v8::Isolate* isolate,
char* buf,
size_t buflen,
v8::Local<v8::Value> val,
enum encoding enc,
int* chars_written = nullptr);
// Take the bytes in the src, and turn it into a Buffer or String.
// Don't call with encoding=UCS2.
static v8::Local<v8::Value> Encode(v8::Isolate* isolate,
const char* buf,
size_t buflen,
enum encoding encoding);
// The input buffer should be in host endianness.
static v8::Local<v8::Value> Encode(v8::Isolate* isolate,
const uint16_t* buf,
size_t buflen);
static v8::Local<v8::Value> Encode(v8::Isolate* isolate,
const char* buf,
enum encoding encoding);
private:
static size_t WriteUCS2(char* buf,
size_t buflen,
size_t nbytes,
const char* data,
v8::Local<v8::String> str,
int flags,
size_t* chars_written);
};
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_STRING_BYTES_H_
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