X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;ds=sidebyside;f=base%2Fchiark-tcl.h;h=ee69928237e7202581091154da3bbe9e41d3cfb4;hb=2cf1bfc63e73a424f9f3899c204025a8346b38e0;hp=83469d561452a45fea7d9621da212e38605cb3d5;hpb=503f816f2157f764c7c93c873047aad4ca63e10d;p=chiark-tcl.git

diff --git a/base/chiark-tcl.h b/base/chiark-tcl.h
index 83469d5..ee69928 100644
--- a/base/chiark-tcl.h
+++ b/base/chiark-tcl.h
@@ -34,18 +34,64 @@ typedef unsigned char Byte;
 
 /* from hbytes.c */
 
+/* Internal representation details: */
+#define HBYTES_ISEMPTY(hb)    (!(hb)->begin_complex && !(hb)->end_0)
+#define HBYTES_ISSENTINEL(hb) (!(hb)->begin_complex && (hb)->end_0)
+#define HBYTES_ISSIMPLE(hb)   ((hb)->begin_complex && (hb)->end_0)
+#define HBYTES_ISCOMPLEX(hb)  ((hb)->begin_complex && !(hb)->end_0)
+
 typedef struct {
-  Byte *start, *end; /* always allocated dynamically */
+  void *begin_complex, *end_0;
 } HBytes_Value; /* overlays internalRep */
 
+typedef struct {
+  Byte *dstart; /* always allocated dynamically */
+  int prespace, len, avail;
+  /*        
+   * | SPARE      | USED  | SPARE |
+   * |<-prespace->|<-len->|       |
+   * |            |<----avail---->|
+   *              ^start
+   */
+} HBytes_ComplexValue; /* pointed to from internalRep.otherValuePtr */
+
+/* Public interfaces: */
+
 extern Tcl_ObjType hbytes_type;
 
+int hbytes_len(const HBytes_Value *v);
+Byte *hbytes_data(const HBytes_Value *v); /* caller may then modify data! */
+int hbytes_issentinel(const HBytes_Value *v);
+
+Byte *hbytes_prepend(HBytes_Value *upd, int el);
+Byte *hbytes_append(HBytes_Value *upd, int el);
+  /* return value is where to put the data */
+
+const Byte *hbytes_unprepend(HBytes_Value *upd, int rl);
+const Byte *hbytes_unappend(HBytes_Value *upd, int rl);
+  /* return value points to the removed data, which remains valid
+   * until next op on the HBytes_Value.  If original value is
+   * shorter than rl or negative, returns 0 and does nothing. */
+
+void hbytes_empty(HBytes_Value *returns);
+void hbytes_sentinel(HBytes_Value *returns);
+void hbytes_array(HBytes_Value *returns, const Byte *array, int l);
+Byte *hbytes_arrayspace(HBytes_Value *returns, int l);
+void hbytes_free(HBytes_Value *frees);
+  /* _empty, _sentinel and _array do not free or read the old value;
+   * _free it first if needed.  _free leaves it garbage, so you
+   * have to call _empty to reuse it.  _arrayspace doesn't fill
+   * the array; you get a pointer and must fill it with data
+   * yourself. */
+
+/* The value made by hbytes_sentinel should not be passed to
+ * anything except HBYTES_IS..., and hbytes_free. */
+
+/* from hook.c */
+
 int staticerr(Tcl_Interp *ip, const char *m);
 void objfreeir(Tcl_Obj *o);
 
-void hbytes_set(HBytes_Value *upd, const Byte *array, int l);
-Tcl_Obj *hbytes_set_obj(Tcl_Obj *overwrite, const Byte *array, int l);
-
 /* from parse.c */
 
 typedef struct {
@@ -55,6 +101,8 @@ typedef struct {
 
 void fini_hbv(Tcl_Interp *ip, int rc, HBytes_Var *agg);
 
+/* from chop.c */
+
 /* from enum.c */
 
 extern Tcl_ObjType enum_nearlytype;
@@ -94,8 +142,7 @@ typedef struct {
 
 /* useful macros */
 
-#define HBYTES(o) (*(HBytes_Value*)&(o)->internalRep.twoPtrValue)
-#define HBYTES_LEN(hb) ((hb).end - (hb).start)
+#define OBJ_HBYTES(o) ((HBytes_Value*)&(o)->internalRep.twoPtrValue)
 
 #define TALLOC(s) ((void*)Tcl_Alloc((s)))
 #define TFREE(f) (Tcl_Free((void*)(f)))