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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -35,6 +35,7 @@
'AphrontParameterQueryException' => 'aphront/storage/exception/AphrontParameterQueryException.php',
'AphrontQueryException' => 'aphront/storage/exception/AphrontQueryException.php',
'AphrontRecoverableQueryException' => 'aphront/storage/exception/AphrontRecoverableQueryException.php',
+ 'AphrontRequestStream' => 'aphront/requeststream/AphrontRequestStream.php',
'AphrontSchemaQueryException' => 'aphront/storage/exception/AphrontSchemaQueryException.php',
'AphrontScopedUnguardedWriteCapability' => 'aphront/writeguard/AphrontScopedUnguardedWriteCapability.php',
'AphrontWriteGuard' => 'aphront/writeguard/AphrontWriteGuard.php',
@@ -558,6 +559,7 @@
'AphrontParameterQueryException' => 'AphrontQueryException',
'AphrontQueryException' => 'Exception',
'AphrontRecoverableQueryException' => 'AphrontQueryException',
+ 'AphrontRequestStream' => 'Phobject',
'AphrontSchemaQueryException' => 'AphrontQueryException',
'AphrontScopedUnguardedWriteCapability' => 'Phobject',
'AphrontWriteGuard' => 'Phobject',
diff --git a/src/aphront/requeststream/AphrontRequestStream.php b/src/aphront/requeststream/AphrontRequestStream.php
new file mode 100644
--- /dev/null
+++ b/src/aphront/requeststream/AphrontRequestStream.php
@@ -0,0 +1,92 @@
+<?php
+
+final class AphrontRequestStream extends Phobject {
+
+ private $encoding;
+ private $stream;
+ private $closed;
+
+ public function setEncoding($encoding) {
+ $this->encoding = $encoding;
+ return $this;
+ }
+
+ public function getEncoding() {
+ return $this->encoding;
+ }
+
+ public function readData() {
+ if ($this->closed) {
+ return null;
+ }
+
+ $stream = $this->getStream();
+ if (feof($stream)) {
+ $this->closeStream();
+ return null;
+ }
+
+ $bytes = fread($stream, 64 * 1024);
+ if ($bytes === false) {
+ throw new Exception(
+ pht('Failed to fread() from request input stream.'));
+ }
+
+ return $bytes;
+ }
+
+ private function getStream() {
+ if (!$this->stream) {
+ $this->stream = $this->newStream();
+ }
+
+ return $this->stream;
+ }
+
+ private function closeStream() {
+ $stream = $this->getStream();
+ fclose($stream);
+ $this->closed = true;
+ }
+
+ private function newStream() {
+ $stream = fopen('php://input', 'rb');
+ if (!$stream) {
+ throw new Exception(
+ pht(
+ 'Failed to open stream "%s" for reading.',
+ 'php://input'));
+ }
+
+ $encoding = $this->getEncoding();
+ if ($encoding === 'gzip') {
+ // This parameter is magic. Values 0-15 express a time/memory tradeoff,
+ // but the largest value (15) corresponds to only 32KB of memory and
+ // data encoded with a smaller window size than the one we pass can not
+ // be decompressed. Always pass the maximum window size.
+
+ // Additionally, you can add 16 (to enable gzip) or 32 (to enable both
+ // gzip and zlib). Add 32 to support both.
+ $zlib_window = 15 + 32;
+
+ $ok = stream_filter_append(
+ $stream,
+ 'zlib.inflate',
+ STREAM_FILTER_READ,
+ array(
+ 'window' => $zlib_window,
+ ));
+ if (!$ok) {
+ throw new Exception(
+ pht(
+ 'Failed to append filter "%s" to input stream while processing '.
+ 'a request with "%s" encoding.',
+ 'zlib.inflate',
+ $encoding));
+ }
+ }
+
+ return $stream;
+ }
+
+}

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