X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb-python/blobdiff_plain/42d30ef60edcafe5b5f85f8c0e7d7637ed0a84fc..4d09d07e731d0454bf9f103ba486f06edcc6c2df:/bytestring.c

diff --git a/bytestring.c b/bytestring.c
index 4a7378d..124ae9a 100644
--- a/bytestring.c
+++ b/bytestring.c
@@ -32,10 +32,12 @@
 
 PyTypeObject *bytestring_pytype;
 
-static PyObject *dowrap(PyTypeObject *ty, const void *p, size_t n)
+static PyObject *empty, *bytev[256];
+
+static PyObject *allocate(PyTypeObject *ty, size_t n)
 {
-  PyStringObject *x = (PyStringObject *)ty->tp_alloc(ty, n);
-  if (p) memcpy(x->ob_sval, p, n);
+  PyStringObject *x;
+  x = (PyStringObject *)ty->tp_alloc(ty, n);
   x->ob_sval[n] = 0;
 #if defined(CACHE_HASH) || PY_VERSION_HEX >= 0x02030000
   x->ob_shash = -1;
@@ -44,6 +46,27 @@ static PyObject *dowrap(PyTypeObject *ty, const void *p, size_t n)
   return ((PyObject *)x);
 }
 
+static PyObject *dowrap(PyTypeObject *ty, const void *p, size_t n)
+{
+  PyObject *x;
+  int ch;
+
+  if (p && ty == bytestring_pytype) {
+    if (!n) {
+      if (!empty) empty = allocate(ty, 0);
+      Py_INCREF(empty); return (empty);
+    } else if (n == 1 && (ch = *(unsigned char *)p) < sizeof(bytev)) {
+      if (!bytev[ch])
+	{ bytev[ch] = allocate(ty, 1); *PyString_AS_STRING(bytev[ch]) = ch; }
+      Py_INCREF(bytev[ch]); return (bytev[ch]);
+    }
+  }
+
+  x = allocate(ty, n);
+  if (p) memcpy(PyString_AS_STRING(x), p, n);
+  return (x);
+}
+
 PyObject *bytestring_pywrap(const void *p, size_t n)
   { return (dowrap(bytestring_pytype, p, n)); }
 
@@ -54,13 +77,70 @@ static PyObject *bytestring_pynew(PyTypeObject *ty,
 				  PyObject *arg, PyObject *kw)
 {
   const char *p;
-  int n;
-  static char *kwlist[] = { "data", 0 };
-  if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", kwlist, &p, &n))
+  Py_ssize_t n;
+  static const char *const kwlist[] = { "data", 0 };
+  if (!PyArg_ParseTupleAndKeywords(arg, kw, "s#:new", KWLIST, &p, &n))
     return (0);
   return (dowrap(ty, p, n));
 }
 
+static PyObject *meth_ctstreq(PyObject *me, PyObject *arg)
+{
+  char *p, *q;
+  Py_ssize_t psz, qsz;
+  if (!PyArg_ParseTuple(arg, "s#s#:ctstreq", &p, &psz, &q, &qsz))
+    goto end;
+  if (psz == qsz && ct_memeq(p, q, psz)) RETURN_TRUE;
+  else RETURN_FALSE;
+end:
+  return (0);
+}
+
+static PyObject *meth__ByteString_zero(PyObject *me, PyObject *arg)
+{
+  size_t sz;
+  PyObject *rc = 0;
+  if (!PyArg_ParseTuple(arg, "OO&:zero", &me, convszt, &sz)) goto end;
+  rc = bytestring_pywrap(0, sz);
+  memset(PyString_AS_STRING(rc), 0, sz);
+end:
+  return (rc);
+}
+
+static PyObject *bytestring_pyrichcompare(PyObject *me,
+					  PyObject *you, int op)
+{
+  int b;
+  void *mystr, *yourstr;
+  Py_ssize_t mylen, yourlen, minlen;
+
+  if (!PyString_Check(me) || !PyString_Check(you)) RETURN_NOTIMPL;
+  mystr = PyString_AS_STRING(me); mylen = PyString_GET_SIZE(me);
+  yourstr = PyString_AS_STRING(you); yourlen = PyString_GET_SIZE(you);
+
+  switch (op) {
+    case Py_EQ:
+      b = mylen == yourlen && ct_memeq(mystr, yourstr, mylen);
+      break;
+    case Py_NE:
+      b = mylen != yourlen || !ct_memeq(mystr, yourstr, mylen);
+      break;
+    default:
+      minlen = mylen < yourlen ? mylen : yourlen;
+      b = memcmp(mystr, yourstr, minlen);
+      if (!b) b = mylen < yourlen ? -1 : mylen > yourlen ? +1 : 0;
+      switch (op) {
+	case Py_LT: b = b <  0; break;
+	case Py_LE: b = b <= 0; break;
+	case Py_GE: b = b >= 0; break;
+	case Py_GT: b = b >  0; break;
+	default: abort();
+      }
+  }
+  if (b) RETURN_TRUE;
+  else RETURN_FALSE;
+}
+
 #define BINOP(name, op)							\
   static PyObject *bytestring_py##name(PyObject *x, PyObject *y) {	\
     const void *xv, *yv;						\
@@ -154,11 +234,11 @@ static PyTypeObject bytestring_pytype_skel = {
     Py_TPFLAGS_BASETYPE,
 
   /* @tp_doc@ */
-"Byte string class.",
+"ByteString(STR): byte string class.",
 
   0,					/* @tp_traverse@ */
   0,					/* @tp_clear@ */
-  0,					/* @tp_richcompare@ */
+  bytestring_pyrichcompare,		/* @tp_richcompare@ */
   0,					/* @tp_weaklistoffset@ */
   0,					/* @tp_iter@ */
   0,					/* @tp_iternext@ */
@@ -179,10 +259,19 @@ static PyTypeObject bytestring_pytype_skel = {
 
 /*----- Initialization ----------------------------------------------------*/
 
+static PyMethodDef methods[] = {
+#define METHNAME(func) meth_##func
+  METH  (ctstreq,		"ctstreq(S, T) -> BOOL")
+  METH	(_ByteString_zero,	"zero(N) -> 0000...00")
+#undef METHNAME
+  { 0 }
+};
+
 #define string_pytype &PyString_Type
 void bytestring_pyinit(void)
 {
   INITTYPE(bytestring, string);
+  addmethods(methods);
 }
 
 void bytestring_pyinsert(PyObject *mod)