/proto/protocolbuffers.inc.php
PHP | 316 lines | 220 code | 40 blank | 56 comment | 41 complexity | 52855cab6e6398869cb082217a0f0a72 MD5 | raw file
- <?php
- class ProtobufEnum {
- public static function toString($value) {
- if (is_null($value))
- return null;
- if (array_key_exists($value, self::$_values))
- return self::$_values[$value];
- return 'UNKNOWN';
- }
- }
- class ProtobufMessage {
- function __construct($fp = NULL, &$limit = PHP_INT_MAX) {
- if($fp !== NULL) {
- if (is_string($fp)) {
- // If the input is a string, turn it into a stream and decode it
- $str = $fp;
- $fp = fopen('php://memory', 'r+b');
- fwrite($fp, $str);
- rewind($fp);
- }
- $this->read($fp, $limit);
- if (isset($str))
- fclose($fp);
- }
- }
- }
- /**
- * Class to aid in the parsing and creating of Protocol Buffer Messages
- * This class should be included by the developer before they use a
- * generated protobuf class.
- *
- * @author Andrew Brampton
- *
- */
- class Protobuf {
- const TYPE_DOUBLE = 1; // double, exactly eight bytes on the wire.
- const TYPE_FLOAT = 2; // float, exactly four bytes on the wire.
- const TYPE_INT64 = 3; // int64, varint on the wire. Negative numbers
- // take 10 bytes. Use TYPE_SINT64 if negative
- // values are likely.
- const TYPE_UINT64 = 4; // uint64, varint on the wire.
- const TYPE_INT32 = 5; // int32, varint on the wire. Negative numbers
- // take 10 bytes. Use TYPE_SINT32 if negative
- // values are likely.
- const TYPE_FIXED64 = 6; // uint64, exactly eight bytes on the wire.
- const TYPE_FIXED32 = 7; // uint32, exactly four bytes on the wire.
- const TYPE_BOOL = 8; // bool, varint on the wire.
- const TYPE_STRING = 9; // UTF-8 text.
- const TYPE_GROUP = 10; // Tag-delimited message. Deprecated.
- const TYPE_MESSAGE = 11; // Length-delimited message.
- const TYPE_BYTES = 12; // Arbitrary byte array.
- const TYPE_UINT32 = 13; // uint32, varint on the wire
- const TYPE_ENUM = 14; // Enum, varint on the wire
- const TYPE_SFIXED32 = 15; // int32, exactly four bytes on the wire
- const TYPE_SFIXED64 = 16; // int64, exactly eight bytes on the wire
- const TYPE_SINT32 = 17; // int32, ZigZag-encoded varint on the wire
- const TYPE_SINT64 = 18; // int64, ZigZag-encoded varint on the wire
- /**
- * Returns a string representing this wiretype
- */
- public static function get_wiretype($wire_type) {
- switch ($wire_type) {
- case 0: return 'varint';
- case 1: return '64-bit';
- case 2: return 'length-delimited';
- case 3: return 'group start';
- case 4: return 'group end';
- case 5: return '32-bit';
- default: return 'unknown';
- }
- }
- /**
- * Returns how big (in bytes) this number would be as a varint
- */
- public static function size_varint($i) {
- /* $len = 0;
- do {
- $i = $i >> 7;
- $len++;
- } while ($i != 0);
- return $len;
- */
- // TODO Change to a binary search
- if ($i < 0x80)
- return 1;
- if ($i < 0x4000)
- return 2;
- if ($i < 0x200000)
- return 3;
- if ($i < 0x10000000)
- return 4;
- if ($i < 0x800000000)
- return 5;
- if ($i < 0x40000000000)
- return 6;
- if ($i < 0x2000000000000)
- return 7;
- if ($i < 0x100000000000000)
- return 8;
- if ($i < 0x8000000000000000)
- return 9;
- }
- /**
- * Tries to read a varint from $fp.
- * @returns the Varint from the stream, or false if the stream has reached eof.
- */
- public static function read_varint($fp, &$limit = null) {
- $value = '';
- $len = 0;
- do { // Keep reading until we find the last byte
- $b = fread($fp, 1);
- if ($b === false)
- throw new Exception("read_varint(): Error reading byte");
- if (strlen($b) < 1)
- break;
- $value .= $b;
- $len++;
- } while ($b >= "\x80");
- if ($len == 0) {
- if (feof($fp))
- return false;
- throw new Exception("read_varint(): Error reading byte");
- }
- if ($limit !== null)
- $limit -= $len;
- $i = 0;
- $shift = 0;
- for ($j = 0; $j < $len; $j++) {
- $i |= ((ord($value[$j]) & 0x7F) << $shift);
- $shift += 7;
- }
- return $i;
- }
- public static function read_double($fp){throw "I've not coded it yet Exception";}
- public static function read_float ($fp){throw "I've not coded it yet Exception";}
- public static function read_uint64($fp){throw "I've not coded it yet Exception";}
- public static function read_int64 ($fp){throw "I've not coded it yet Exception";}
- public static function read_uint32($fp){throw "I've not coded it yet Exception";}
- public static function read_int32 ($fp){throw "I've not coded it yet Exception";}
- public static function read_zint32($fp){throw "I've not coded it yet Exception";}
- public static function read_zint64($fp){throw "I've not coded it yet Exception";}
- /**
- * Writes a varint to $fp
- * returns the number of bytes written
- * @param $fp
- * @param $i The int to encode
- * @return The number of bytes written
- */
- public static function write_varint($fp, $i) {
- $len = 0;
- do {
- $v = $i & 0x7F;
- $i = $i >> 7;
- if ($i != 0)
- $v |= 0x80;
- if (fwrite($fp, chr($v)) !== 1)
- throw new Exception("write_varint(): Error writing byte");
- $len++;
- } while ($i != 0);
- return $len;
- }
- public static function write_double($fp, $d){throw "I've not coded it yet Exception";}
- public static function write_float ($fp, $f){throw "I've not coded it yet Exception";}
- public static function write_uint64($fp, $i){throw "I've not coded it yet Exception";}
- public static function write_int64 ($fp, $i){throw "I've not coded it yet Exception";}
- public static function write_uint32($fp, $i){throw "I've not coded it yet Exception";}
- public static function write_int32 ($fp, $i){throw "I've not coded it yet Exception";}
- public static function write_zint32($fp, $i){throw "I've not coded it yet Exception";}
- public static function write_zint64($fp, $i){throw "I've not coded it yet Exception";}
- /**
- * Seek past a varint
- */
- public static function skip_varint($fp) {
- $len = 0;
- do { // Keep reading until we find the last byte
- $b = fread($fp, 1);
- if ($b === false)
- throw new Exception("skip(varint): Error reading byte");
- $len++;
- } while ($b >= "\x80");
- return $len;
- }
- /**
- * Seek past the current field
- */
- public static function skip_field($fp, $wire_type) {
- switch ($wire_type) {
- case 0: // varint
- return Protobuf::skip_varint($fp);
- case 1: // 64bit
- if (fseek($fp, 8, SEEK_CUR) === -1)
- throw new Exception('skip(' . ProtoBuf::get_wiretype(1) . '): Error seeking');
- return 8;
- case 2: // length delimited
- $varlen = 0;
- $len = Protobuf::read_varint($fp, $varlen);
- if (fseek($fp, $len, SEEK_CUR) === -1)
- throw new Exception('skip(' . ProtoBuf::get_wiretype(2) . '): Error seeking');
- return $len - $varlen;
- //case 3: // Start group TODO we must keep looping until we find the closing end grou
- //case 4: // End group - We should never skip a end group!
- // return 0; // Do nothing
- case 5: // 32bit
- if (fseek($fp, 4, SEEK_CUR) === -1)
- throw new Exception('skip('. ProtoBuf::get_wiretype(5) . '): Error seeking');
- return 4;
- default:
- throw new Exception('skip('. ProtoBuf::get_wiretype($wire_type) . '): Unsupported wire_type');
- }
- }
- /**
- * Read a unknown field from the stream and return its raw bytes
- */
- public static function read_field($fp, $wire_type, &$limit = null) {
- switch ($wire_type) {
- case 0: // varint
- return Protobuf::read_varint($fp, $limit);
- case 1: // 64bit
- $limit -= 8;
- return fread($fp, 8);
- case 2: // length delimited
- $len = Protobuf::read_varint($fp, $limit);
- $limit -= $len;
- return fread($fp, $len);
- //case 3: // Start group TODO we must keep looping until we find the closing end grou
- case (3||4||7):
- return null;
- //case 4: // End group - We should never skip a end group!
- // return 0; // Do nothing
- case 5: // 32bit
- $limit -= 4;
- return fread($fp, 4);
- default:
- throw new Exception('read_unknown('. ProtoBuf::get_wiretype($wire_type) . '): Unsupported wire_type');
- }
- }
- /**
- * Used to aid in pretty printing of Protobuf objects
- */
- private static $print_depth = 0;
- private static $indent_char = "\t";
- private static $print_limit = 50;
- public static function toString($key, $value) {
- if (is_null($value))
- return;
- $ret = str_repeat(self::$indent_char, self::$print_depth) . "$key=>";
- if (is_array($value)) {
- $ret .= "array(\n";
- self::$print_depth++;
- foreach($value as $i => $v)
- $ret .= self::toString("[$i]", $v);
- self::$print_depth--;
- $ret .= str_repeat(self::$indent_char, self::$print_depth) . ")\n";
- } else {
- if (is_object($value)) {
- self::$print_depth++;
- $ret .= get_class($value) . "(\n";
- $ret .= $value->__toString() . "\n";
- self::$print_depth--;
- $ret .= str_repeat(self::$indent_char, self::$print_depth) . ")\n";
- } elseif (is_string($value)) {
- $safevalue = addcslashes($value, "\0..\37\177..\377");
- if (strlen($safevalue) > self::$print_limit) {
- $safevalue = substr($safevalue, 0, self::$print_limit) . '...';
- }
- $ret .= '"' . $safevalue . '" (' . strlen($value) . " bytes)\n";
- } elseif (is_bool($value)) {
- $ret .= ($value ? 'true' : 'false') . "\n";
- } else {
- $ret .= (string)$value . "\n";
- }
- }
- return $ret;
- }
- }
- ?>