Add NGHTTP2_DEFAULT_HEADER_TABLE_SIZE macro

Use this macro in Python sources.  Python module constant
HD_DEFLATE_HD_TABLE_BUFSIZE_MAX was renamed as
DEFLATE_MAX_HEADER_TABLE_SIZE since the previous name was awkward.

lib/includes/nghttp2/nghttp2.h

@@ -159,6 +159,12 @@ typedef struct {
  */
 #define NGHTTP2_MAX_HEADER_TABLE_SIZE (1 << 28)
 
+/**
+ * @macro
+ *
+ * The default header table size.
+ */
+#define NGHTTP2_DEFAULT_HEADER_TABLE_SIZE (1 << 12)
 
 /**
  * @macro

lib/nghttp2_hd.h

@@ -34,7 +34,7 @@
 #include "nghttp2_hd_huffman.h"
 #include "nghttp2_buf.h"
 
-#define NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE (1 << 12)
+#define NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE NGHTTP2_DEFAULT_HEADER_TABLE_SIZE
 #define NGHTTP2_HD_ENTRY_OVERHEAD 32
 
 /* The maximum value length of name/value pair. This is not specified

python/cnghttp2.pxd

@@ -27,6 +27,7 @@ cdef extern from 'nghttp2/nghttp2.h':
     const char NGHTTP2_PROTO_VERSION_ID[]
     const char NGHTTP2_CLIENT_CONNECTION_PREFACE[]
     const size_t NGHTTP2_INITIAL_WINDOW_SIZE
+    const size_t NGHTTP2_DEFAULT_HEADER_TABLE_SIZE
 
     ctypedef struct nghttp2_session:
         pass

python/hpackmake.py

@@ -26,7 +26,7 @@ result in less bits on the wire.'''
     cases = []
     deflater = nghttp2.HDDeflater(deflate_table_size)
 
-    if table_size != 4096:
+    if table_size != nghttp2.DEFAULT_HEADER_TABLE_SIZE:
         deflater.change_table_size(table_size)
 
     for casenum, item  in enumerate(testdata['cases']):
@@ -41,7 +41,7 @@ result in less bits on the wire.'''
         outitem['wire'] = b2a_hex(deflater.deflate(hdrs)).decode('utf-8')
         cases.append(outitem)
 
-    if cases and table_size != 4096:
+    if cases and table_size != nghttp2.DEFAULT_HEADER_TABLE_SIZE:
         cases[0]['header_table_size'] = table_size
 
     res['cases'] = cases
@@ -53,10 +53,10 @@ if __name__ == '__main__':
     ap = argparse.ArgumentParser(description='HPACK test case generator')
     ap.add_argument('-d', '--dir', help='output directory', default='out')
     ap.add_argument('-s', '--table-size', help='max header table size',
-                    type=int, default=4096)
+                    type=int, default=nghttp2.DEFAULT_HEADER_TABLE_SIZE)
     ap.add_argument('-S', '--deflate-table-size',
                     help='max header table size for deflater',
-                    type=int, default=4096)
+                    type=int, default=nghttp2.DEFLATE_MAX_HEADER_TABLE_SIZE)
     ap.add_argument('file', nargs='*', help='input file')
     args = ap.parse_args()
     try:

python/nghttp2.pyx

@@ -26,7 +26,8 @@ from libc.stdlib cimport malloc, free
 from libc.string cimport memcpy, memset
 from libc.stdint cimport uint8_t, uint16_t, uint32_t, int32_t
 
-HD_DEFLATE_HD_TABLE_BUFSIZE_MAX = 4096
+DEFAULT_HEADER_TABLE_SIZE = cnghttp2.NGHTTP2_DEFAULT_HEADER_TABLE_SIZE
+DEFLATE_MAX_HEADER_TABLE_SIZE = 4096
 
 HD_ENTRY_OVERHEAD = cnghttp2.NGHTTP2_HD_ENTRY_OVERHEAD
 
@@ -83,8 +84,7 @@ cdef class HDDeflater:
 
     cdef cnghttp2.nghttp2_hd_deflater _deflater
 
-    def __cinit__(self,
-                  hd_table_bufsize_max = HD_DEFLATE_HD_TABLE_BUFSIZE_MAX):
+    def __cinit__(self, hd_table_bufsize_max = DEFLATE_MAX_HEADER_TABLE_SIZE):
         rv = cnghttp2.nghttp2_hd_deflate_init2(&self._deflater,
                                                hd_table_bufsize_max)
         if rv != 0: