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string_bytes.h
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171 lines (143 loc) · 6 KB
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#ifndef SRC_STRING_BYTES_H_
#define SRC_STRING_BYTES_H_
// 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"
namespace node {
class StringBytes {
public:
class InlineDecoder {
public:
InlineDecoder() : out_(nullptr) {
}
~InlineDecoder() {
if (out_ != out_st_)
delete[] out_;
out_ = nullptr;
}
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;
}
size_t buflen = StringBytes::StorageSize(env->isolate(), string, enc);
if (buflen > sizeof(out_st_))
out_ = new char[buflen];
else
out_ = out_st_;
size_ = StringBytes::Write(env->isolate(),
out_,
buflen,
string,
enc);
return true;
}
inline const char* out() const { return out_; }
inline size_t size() const { return size_; }
private:
static const int kStorageSize = 1024;
char out_st_[kStorageSize];
char* out_;
size_t size_;
};
// 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);
// Deprecated legacy interface
NODE_DEPRECATED("Use IsValidString(isolate, ...)",
static inline bool IsValidString(
v8::Local<v8::String> string,
enum encoding enc) {
return IsValidString(v8::Isolate::GetCurrent(), string, enc);
})
NODE_DEPRECATED("Use StorageSize(isolate, ...)",
static inline size_t StorageSize(v8::Local<v8::Value> val,
enum encoding enc) {
return StorageSize(v8::Isolate::GetCurrent(), val, enc);
})
NODE_DEPRECATED("Use Size(isolate, ...)",
static inline size_t Size(v8::Local<v8::Value> val,
enum encoding enc) {
return Size(v8::Isolate::GetCurrent(), val, enc);
})
NODE_DEPRECATED("Use GetExternalParts(isolate, ...)",
static inline bool GetExternalParts(v8::Local<v8::Value> val,
const char** data,
size_t* len) {
return GetExternalParts(v8::Isolate::GetCurrent(), val, data, len);
})
NODE_DEPRECATED("Use Write(isolate, ...)",
static inline size_t Write(char* buf,
size_t buflen,
v8::Local<v8::Value> val,
enum encoding enc,
int* chars_written = nullptr) {
v8::Isolate* isolate = v8::Isolate::GetCurrent();
return Write(isolate, buf, buflen, val, enc, chars_written);
})
NODE_DEPRECATED("Use Encode(isolate, ...)",
static inline v8::Local<v8::Value> Encode(
const char* buf,
size_t buflen,
enum encoding encoding) {
return Encode(v8::Isolate::GetCurrent(), buf, buflen, 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 // SRC_STRING_BYTES_H_