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1 files changed, 305 insertions, 0 deletions

diff --git a/node_modules/nan/nan_string_bytes.h b/node_modules/nan/nan_string_bytes.h
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+++ b/node_modules/nan/nan_string_bytes.h
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+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef NAN_STRING_BYTES_H_
+#define NAN_STRING_BYTES_H_
+
+// Decodes a v8::Local<v8::String> or Buffer to a raw char*
+
+namespace imp {
+
+using v8::Local;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+
+//// Base 64 ////
+
+#define base64_encoded_size(size) ((size + 2 - ((size + 2) % 3)) / 3 * 4)
+
+
+
+//// HEX ////
+
+static bool contains_non_ascii_slow(const char* buf, size_t len) {
+  for (size_t i = 0; i < len; ++i) {
+    if (buf[i] & 0x80) return true;
+  }
+  return false;
+}
+
+
+static bool contains_non_ascii(const char* src, size_t len) {
+  if (len < 16) {
+    return contains_non_ascii_slow(src, len);
+  }
+
+  const unsigned bytes_per_word = sizeof(void*);
+  const unsigned align_mask = bytes_per_word - 1;
+  const unsigned unaligned = reinterpret_cast<uintptr_t>(src) & align_mask;
+
+  if (unaligned > 0) {
+    const unsigned n = bytes_per_word - unaligned;
+    if (contains_non_ascii_slow(src, n)) return true;
+    src += n;
+    len -= n;
+  }
+
+
+#if defined(__x86_64__) || defined(_WIN64)
+  const uintptr_t mask = 0x8080808080808080ll;
+#else
+  const uintptr_t mask = 0x80808080l;
+#endif
+
+  const uintptr_t* srcw = reinterpret_cast<const uintptr_t*>(src);
+
+  for (size_t i = 0, n = len / bytes_per_word; i < n; ++i) {
+    if (srcw[i] & mask) return true;
+  }
+
+  const unsigned remainder = len & align_mask;
+  if (remainder > 0) {
+    const size_t offset = len - remainder;
+    if (contains_non_ascii_slow(src + offset, remainder)) return true;
+  }
+
+  return false;
+}
+
+
+static void force_ascii_slow(const char* src, char* dst, size_t len) {
+  for (size_t i = 0; i < len; ++i) {
+    dst[i] = src[i] & 0x7f;
+  }
+}
+
+
+static void force_ascii(const char* src, char* dst, size_t len) {
+  if (len < 16) {
+    force_ascii_slow(src, dst, len);
+    return;
+  }
+
+  const unsigned bytes_per_word = sizeof(void*);
+  const unsigned align_mask = bytes_per_word - 1;
+  const unsigned src_unalign = reinterpret_cast<uintptr_t>(src) & align_mask;
+  const unsigned dst_unalign = reinterpret_cast<uintptr_t>(dst) & align_mask;
+
+  if (src_unalign > 0) {
+    if (src_unalign == dst_unalign) {
+      const unsigned unalign = bytes_per_word - src_unalign;
+      force_ascii_slow(src, dst, unalign);
+      src += unalign;
+      dst += unalign;
+      len -= src_unalign;
+    } else {
+      force_ascii_slow(src, dst, len);
+      return;
+    }
+  }
+
+#if defined(__x86_64__) || defined(_WIN64)
+  const uintptr_t mask = ~0x8080808080808080ll;
+#else
+  const uintptr_t mask = ~0x80808080l;
+#endif
+
+  const uintptr_t* srcw = reinterpret_cast<const uintptr_t*>(src);
+  uintptr_t* dstw = reinterpret_cast<uintptr_t*>(dst);
+
+  for (size_t i = 0, n = len / bytes_per_word; i < n; ++i) {
+    dstw[i] = srcw[i] & mask;
+  }
+
+  const unsigned remainder = len & align_mask;
+  if (remainder > 0) {
+    const size_t offset = len - remainder;
+    force_ascii_slow(src + offset, dst + offset, remainder);
+  }
+}
+
+
+static size_t base64_encode(const char* src,
+                            size_t slen,
+                            char* dst,
+                            size_t dlen) {
+  // We know how much we'll write, just make sure that there's space.
+  assert(dlen >= base64_encoded_size(slen) &&
+      "not enough space provided for base64 encode");
+
+  dlen = base64_encoded_size(slen);
+
+  unsigned a;
+  unsigned b;
+  unsigned c;
+  unsigned i;
+  unsigned k;
+  unsigned n;
+
+  static const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                              "abcdefghijklmnopqrstuvwxyz"
+                              "0123456789+/";
+
+  i = 0;
+  k = 0;
+  n = slen / 3 * 3;
+
+  while (i < n) {
+    a = src[i + 0] & 0xff;
+    b = src[i + 1] & 0xff;
+    c = src[i + 2] & 0xff;
+
+    dst[k + 0] = table[a >> 2];
+    dst[k + 1] = table[((a & 3) << 4) | (b >> 4)];
+    dst[k + 2] = table[((b & 0x0f) << 2) | (c >> 6)];
+    dst[k + 3] = table[c & 0x3f];
+
+    i += 3;
+    k += 4;
+  }
+
+  if (n != slen) {
+    switch (slen - n) {
+      case 1:
+        a = src[i + 0] & 0xff;
+        dst[k + 0] = table[a >> 2];
+        dst[k + 1] = table[(a & 3) << 4];
+        dst[k + 2] = '=';
+        dst[k + 3] = '=';
+        break;
+
+      case 2:
+        a = src[i + 0] & 0xff;
+        b = src[i + 1] & 0xff;
+        dst[k + 0] = table[a >> 2];
+        dst[k + 1] = table[((a & 3) << 4) | (b >> 4)];
+        dst[k + 2] = table[(b & 0x0f) << 2];
+        dst[k + 3] = '=';
+        break;
+    }
+  }
+
+  return dlen;
+}
+
+
+static size_t hex_encode(const char* src, size_t slen, char* dst, size_t dlen) {
+  // We know how much we'll write, just make sure that there's space.
+  assert(dlen >= slen * 2 &&
+      "not enough space provided for hex encode");
+
+  dlen = slen * 2;
+  for (uint32_t i = 0, k = 0; k < dlen; i += 1, k += 2) {
+    static const char hex[] = "0123456789abcdef";
+    uint8_t val = static_cast<uint8_t>(src[i]);
+    dst[k + 0] = hex[val >> 4];
+    dst[k + 1] = hex[val & 15];
+  }
+
+  return dlen;
+}
+
+
+
+static Local<Value> Encode(const char* buf,
+                           size_t buflen,
+                           enum Encoding encoding) {
+  assert(buflen <= node::Buffer::kMaxLength);
+  if (!buflen && encoding != BUFFER)
+    return New("").ToLocalChecked();
+
+  Local<String> val;
+  switch (encoding) {
+    case BUFFER:
+      return CopyBuffer(buf, buflen).ToLocalChecked();
+
+    case ASCII:
+      if (contains_non_ascii(buf, buflen)) {
+        char* out = new char[buflen];
+        force_ascii(buf, out, buflen);
+        val = New<String>(out, buflen).ToLocalChecked();
+        delete[] out;
+      } else {
+        val = New<String>(buf, buflen).ToLocalChecked();
+      }
+      break;
+
+    case UTF8:
+      val = New<String>(buf, buflen).ToLocalChecked();
+      break;
+
+    case BINARY: {
+      // TODO(isaacs) use ExternalTwoByteString?
+      const unsigned char *cbuf = reinterpret_cast<const unsigned char*>(buf);
+      uint16_t * twobytebuf = new uint16_t[buflen];
+      for (size_t i = 0; i < buflen; i++) {
+        // XXX is the following line platform independent?
+        twobytebuf[i] = cbuf[i];
+      }
+      val = New<String>(twobytebuf, buflen).ToLocalChecked();
+      delete[] twobytebuf;
+      break;
+    }
+
+    case BASE64: {
+      size_t dlen = base64_encoded_size(buflen);
+      char* dst = new char[dlen];
+
+      size_t written = base64_encode(buf, buflen, dst, dlen);
+      assert(written == dlen);
+
+      val = New<String>(dst, dlen).ToLocalChecked();
+      delete[] dst;
+      break;
+    }
+
+    case UCS2: {
+      const uint16_t* data = reinterpret_cast<const uint16_t*>(buf);
+      val = New<String>(data, buflen / 2).ToLocalChecked();
+      break;
+    }
+
+    case HEX: {
+      size_t dlen = buflen * 2;
+      char* dst = new char[dlen];
+      size_t written = hex_encode(buf, buflen, dst, dlen);
+      assert(written == dlen);
+
+      val = New<String>(dst, dlen).ToLocalChecked();
+      delete[] dst;
+      break;
+    }
+
+    default:
+      assert(0 && "unknown encoding");
+      break;
+  }
+
+  return val;
+}
+
+#undef base64_encoded_size
+
+}  // end of namespace imp
+
+#endif  // NAN_STRING_BYTES_H_