Make error codes smaller (#851)

* Make error codes smaller

* Correct diagram and hyphens

draft-ietf-quic-http.md

@@ -1277,7 +1277,7 @@ The entries in the following table are registered by this document.
 ## Error Codes {#iana-error-codes}
 
 This document establishes a registry for HTTP/QUIC error codes.  The
-"HTTP/QUIC Error Code" registry manages a 32-bit space.  The "HTTP/QUIC
+"HTTP/QUIC Error Code" registry manages a 16-bit space.  The "HTTP/QUIC
 Error Code" registry operates under the "Expert Review" policy
 {{?RFC5226}}.
 
@@ -1292,7 +1292,7 @@ Name:
 : A name for the error code.  Specifying an error code name is optional.
 
 Code:
-: The 32-bit error code value.
+: The 16-bit error code value.
 
 Description:
 : A brief description of the error code semantics, longer if no detailed

draft-ietf-quic-transport.md

@@ -1688,7 +1688,7 @@ The RST_STREAM frame is as follows:
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                        Stream ID (32)                         |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|             Application Protocol Error Code (32)              |
+|  Application Error Code (16)  |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                                                               |
 +                       Final Offset (64)                       +
@@ -1704,7 +1704,7 @@ Stream ID:
 
 Application Protocol Error Code:
 
-: A 32-bit application protocol error code (see {{app-error-codes}}) which
+: A 16-bit application protocol error code (see {{app-error-codes}}) which
   indicates why the stream is being closed.
 
 Final Offset:
@@ -1728,17 +1728,17 @@ The CONNECTION_CLOSE frame is as follows:
  0                   1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|                         Error Code (32)                       |
+|           Error Code (16)     |   Reason Phrase Length (16)   |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|   Reason Phrase Length (16)   |      [Reason Phrase (*)]    ...
+|                        Reason Phrase (*)                    ...
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 ~~~
 
 The fields of a CONNECTION_CLOSE frame are as follows:
 
 Error Code:
 
-: A 32-bit error code which indicates the reason for closing this connection.
+: A 16-bit error code which indicates the reason for closing this connection.
   CONNECTION_CLOSE uses codes from the space defined in {{error-codes}}
   (APPLICATION_CLOSE uses codes from the application protocol error code space,
   see {{app-error-codes}}).
@@ -2010,8 +2010,8 @@ The STOP_SENDING frame is as follows:
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |                        Stream ID (32)                         |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-|                   Application Error Code (32)                 |
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|  Application Error Code (16)  |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 ~~~
 
 The fields are:
@@ -2022,7 +2022,7 @@ Stream ID:
 
 Application Error Code:
 
-: A 32-bit, application-specified reason the sender is ignoring the stream (see
+: A 16-bit, application-specified reason the sender is ignoring the stream (see
   {{app-error-codes}}).
 
 
@@ -3033,7 +3033,7 @@ consistent state between endpoints.
 
 ## Transport Error Codes {#error-codes}
 
-Transport error codes are 32 bits long.
+QUIC error codes are 16-bit unsigned integers.
 
 This section lists the defined QUIC transport error codes that may be used in a
 CONNECTION_CLOSE frame.  These errors apply to the entire connection.
@@ -3107,10 +3107,11 @@ See {{iana-error-codes}} for details of registering new error codes.
 
 ## Application Protocol Error Codes {#app-error-codes}
 
-Application protocol error codes are 32-bits long, but the management of
-application error codes are left to application protocols.  Application protocol
-error codes are used for the RST_STREAM ({{frame-rst-stream}}) and
-APPLICATION_CLOSE ({{frame-application-close}}) frames.
+Application protocol error codes are 16-bit unsigned integers, but the
+management of application error codes are left to application protocols.
+Application protocol error codes are used for the RST_STREAM
+({{frame-rst-stream}}) and APPLICATION_CLOSE ({{frame-application-close}})
+frames.
 
 There is no restriction on the use of the 16-bit error code space for
 application protocols.  However, QUIC reserves the error code with a value of 0
@@ -3255,7 +3256,7 @@ The initial contents of this registry are shown in {{iana-tp-table}}.
 IANA \[SHALL add/has added] a registry for "QUIC Transport Error Codes" under a
 "QUIC Protocol" heading.
 
-The "QUIC Transport Error Codes" registry governs a 32-bit space.  This space is
+The "QUIC Transport Error Codes" registry governs a 16-bit space.  This space is
 split into two spaces that are governed by different policies.  Values with the
 first byte in the range 0x00 to 0xfe (in hexadecimal) are assigned via the
 Specification Required policy {{!RFC5226}}.  Values with the first byte 0xff are
@@ -3265,8 +3266,8 @@ Registrations MUST include the following fields:
 
 Value:
 
-: The numeric value of the assignment (registrations will be between 0x00000000
-  and 0xfeffffff).
+: The numeric value of the assignment (registrations will be between 0x0000 and
+  0xfeff).
 
 Code:
 
@@ -3283,7 +3284,7 @@ Specification:
 
 The initial contents of this registry are shown in {{iana-error-table}}.  Note
 that FRAME_ERROR takes the range from 0x100 to 0x1FF and private use occupies
-the range from 0XFE000000 to 0XFFFFFFFF.
+the range from 0xFE00 to 0xFFFF.
 
 | Value       | Error                     | Description                   | Specification   |
 |:------------|:--------------------------|:------------------------------|:----------------|