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encoding.cc
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#include "node.h"
#include "string_bytes.h"
#include "util-inl.h"
#include "v8.h"
namespace node {
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::Value;
enum encoding ParseEncoding(const char* encoding,
enum encoding default_encoding) {
switch (encoding[0]) {
case 'u':
case 'U':
// Note: the two first conditions are needed for performance reasons
// as "utf8"/"utf-8" is a common case.
// (same for other cases below)
// utf8, utf16le
if (encoding[1] == 't' && encoding[2] == 'f') {
// Skip `-`
const size_t skip = encoding[3] == '-' ? 4 : 3;
if (encoding[skip] == '8' && encoding[skip + 1] == '\0')
return UTF8;
if (strncmp(encoding + skip, "16le", 5) == 0)
return UCS2;
// ucs2
} else if (encoding[1] == 'c' && encoding[2] == 's') {
const size_t skip = encoding[3] == '-' ? 4 : 3;
if (encoding[skip] == '2' && encoding[skip + 1] == '\0')
return UCS2;
}
if (StringEqualNoCase(encoding, "utf8"))
return UTF8;
if (StringEqualNoCase(encoding, "utf-8"))
return UTF8;
if (StringEqualNoCase(encoding, "ucs2"))
return UCS2;
if (StringEqualNoCase(encoding, "ucs-2"))
return UCS2;
if (StringEqualNoCase(encoding, "utf16le"))
return UCS2;
if (StringEqualNoCase(encoding, "utf-16le"))
return UCS2;
break;
case 'l':
case 'L':
// latin1
if (encoding[1] == 'a') {
if (strncmp(encoding + 2, "tin1", 5) == 0)
return LATIN1;
}
if (StringEqualNoCase(encoding, "latin1"))
return LATIN1;
break;
case 'b':
case 'B':
// binary is a deprecated alias of latin1
if (encoding[1] == 'i') {
if (strncmp(encoding + 2, "nary", 5) == 0)
return LATIN1;
// buffer
} else if (encoding[1] == 'u') {
if (strncmp(encoding + 2, "ffer", 5) == 0)
return BUFFER;
// base64
} else if (encoding[1] == 'a') {
if (strncmp(encoding + 2, "se64", 5) == 0)
return BASE64;
if (strncmp(encoding + 2, "se64url", 8) == 0)
return BASE64URL;
}
if (StringEqualNoCase(encoding, "binary"))
return LATIN1; // BINARY is a deprecated alias of LATIN1.
if (StringEqualNoCase(encoding, "buffer"))
return BUFFER;
if (StringEqualNoCase(encoding, "base64"))
return BASE64;
if (StringEqualNoCase(encoding, "base64url"))
return BASE64URL;
break;
case 'a':
case 'A':
// ascii
if (encoding[1] == 's') {
if (strncmp(encoding + 2, "cii", 4) == 0)
return ASCII;
}
if (StringEqualNoCase(encoding, "ascii"))
return ASCII;
break;
case 'h':
case 'H':
// hex
if (encoding[1] == 'e')
if (encoding[2] == 'x' && encoding[3] == '\0')
return HEX;
if (StringEqualNoCase(encoding, "hex"))
return HEX;
break;
}
return default_encoding;
}
enum encoding ParseEncoding(Isolate* isolate,
Local<Value> encoding_v,
Local<Value> encoding_id,
enum encoding default_encoding) {
if (encoding_id->IsUint32()) {
return static_cast<enum encoding>(encoding_id.As<v8::Uint32>()->Value());
}
return ParseEncoding(isolate, encoding_v, default_encoding);
}
enum encoding ParseEncoding(Isolate* isolate,
Local<Value> encoding_v,
enum encoding default_encoding) {
CHECK(!encoding_v.IsEmpty());
if (!encoding_v->IsString())
return default_encoding;
Utf8Value encoding(isolate, encoding_v);
return ParseEncoding(*encoding, default_encoding);
}
Local<Value> Encode(Isolate* isolate,
const char* buf,
size_t len,
enum encoding encoding) {
CHECK_NE(encoding, UCS2);
Local<Value> error;
return StringBytes::Encode(isolate, buf, len, encoding, &error)
.ToLocalChecked();
}
Local<Value> Encode(Isolate* isolate, const uint16_t* buf, size_t len) {
Local<Value> error;
return StringBytes::Encode(isolate, buf, len, &error)
.ToLocalChecked();
}
// Returns -1 if the handle was
3F9C
not valid for decoding
ssize_t DecodeBytes(Isolate* isolate,
Local<Value> val,
enum encoding encoding) {
HandleScope scope(isolate);
return StringBytes::Size(isolate, val, encoding).FromMaybe(-1);
}
// Returns number of bytes written.
ssize_t DecodeWrite(Isolate* isolate,
char* buf,
size_t buflen,
Local<Value> val,
enum encoding encoding) {
return StringBytes::Write(isolate, buf, buflen, val, encoding);
}
} // namespace node