third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/php/src/Google/Protobuf/Internal/OutputStream.php

+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class OutputStream
+{
+
+    private $buffer;
+    private $buffer_size;
+    private $current;
+
+    const MAX_VARINT32_BYTES = 5;
+    const MAX_VARINT64_BYTES = 10;
+
+    public function __construct($size)
+    {
+        $this->current = 0;
+        $this->buffer_size = $size;
+        $this->buffer = str_repeat(chr(0), $this->buffer_size);
+    }
+
+    public function getData()
+    {
+        return $this->buffer;
+    }
+
+    public function writeVarint32($value)
+    {
+        $bytes = str_repeat(chr(0), self::MAX_VARINT32_BYTES);
+        $size = self::writeVarintToArray($value, $bytes, true);
+        return $this->writeRaw($bytes, $size);
+    }
+
+    public function writeVarint64($value)
+    {
+        $bytes = str_repeat(chr(0), self::MAX_VARINT64_BYTES);
+        $size = self::writeVarintToArray($value, $bytes);
+        return $this->writeRaw($bytes, $size);
+    }
+
+    public function writeLittleEndian32($value)
+    {
+        $bytes = str_repeat(chr(0), 4);
+        $size = self::writeLittleEndian32ToArray($value, $bytes);
+        return $this->writeRaw($bytes, $size);
+    }
+
+    public function writeLittleEndian64($value)
+    {
+        $bytes = str_repeat(chr(0), 8);
+        $size = self::writeLittleEndian64ToArray($value, $bytes);
+        return $this->writeRaw($bytes, $size);
+    }
+
+    public function writeTag($tag)
+    {
+        return $this->writeVarint32($tag);
+    }
+
+    public function writeRaw($data, $size)
+    {
+        if ($this->buffer_size < $size) {
+            trigger_error("Output stream doesn't have enough buffer.");
+            return false;
+        }
+
+        for ($i = 0; $i < $size; $i++) {
+            $this->buffer[$this->current] = $data[$i];
+            $this->current++;
+            $this->buffer_size--;
+        }
+        return true;
+    }
+
+    private static function writeVarintToArray($value, &$buffer, $trim = false)
+    {
+        $current = 0;
+
+        $high = 0;
+        $low = 0;
+        if (PHP_INT_SIZE == 4) {
+            GPBUtil::divideInt64ToInt32($value, $high, $low, $trim);
+        } else {
+            if ($trim) {
+                $low = $value & 0xFFFFFFFF;
+            } else {
+                $low = $value;
+            }
+        }
+
+        while ($low >= 0x80 || $low < 0) {
+            $buffer[$current] = chr($low | 0x80);
+            $value = ($value >> 7) & ~(0x7F << ((PHP_INT_SIZE << 3) - 7));
+            $carry = ($high & 0x7F) << ((PHP_INT_SIZE << 3) - 7);
+            $high = ($high >> 7) & ~(0x7F << ((PHP_INT_SIZE << 3) - 7));
+            $low = (($low >> 7) & ~(0x7F << ((PHP_INT_SIZE << 3) - 7)) | $carry);
+            $current++;
+        }
+        $buffer[$current] = chr($low);
+        return $current + 1;
+    }
+
+    private static function writeLittleEndian32ToArray($value, &$buffer)
+    {
+        $buffer[0] = chr($value & 0x000000FF);
+        $buffer[1] = chr(($value >> 8) & 0x000000FF);
+        $buffer[2] = chr(($value >> 16) & 0x000000FF);
+        $buffer[3] = chr(($value >> 24) & 0x000000FF);
+        return 4;
+    }
+
+    private static function writeLittleEndian64ToArray($value, &$buffer)
+    {
+        $high = 0;
+        $low = 0;
+        if (PHP_INT_SIZE == 4) {
+            GPBUtil::divideInt64ToInt32($value, $high, $low);
+        } else {
+            $low = $value & 0xFFFFFFFF;
+            $high = ($value >> 32) & 0xFFFFFFFF;
+        }
+
+        $buffer[0] = chr($low & 0x000000FF);
+        $buffer[1] = chr(($low >> 8) & 0x000000FF);
+        $buffer[2] = chr(($low >> 16) & 0x000000FF);
+        $buffer[3] = chr(($low >> 24) & 0x000000FF);
+        $buffer[4] = chr($high & 0x000000FF);
+        $buffer[5] = chr(($high >> 8) & 0x000000FF);
+        $buffer[6] = chr(($high >> 16) & 0x000000FF);
+        $buffer[7] = chr(($high >> 24) & 0x000000FF);
+        return 8;
+    }
+
+}