b->f = 0;
}
+/* --- @dbuf_create@ --- *
+ *
+ * Arguments: @dbuf *db@ = pointer to a dynamic buffer block
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a dynamic buffer. The buffer is initially empty,
+ * and ready for writing.
+ */
+
+void dbuf_create(dbuf *db)
+{
+ db->_b.base = db->_b.p = db->_b.limit = 0; db->_b.f = BF_ALLOC | BF_WRITE;
+ db->a = &arena_stdlib; db->sz = 0;
+}
+
+/* --- @dbuf_reset@ --- *
+ *
+ * Arguments: @dbuf *db@ = pointer to a buffer block
+ *
+ * Returns: ---
+ *
+ * Use: Resets a buffer so that it can be written again.
+ */
+
+void dbuf_reset(dbuf *db)
+{
+ db->_b.p = db->_b.base; db->_b.limit = db->_b.base + db->sz;
+ db->_b.f = (db->_b.f&~BF_BROKEN) | BF_WRITE;
+}
+
+/* --- @dbuf_destroy@ --- *
+ *
+ * Arguments: @dbuf *db@ = pointer to a buffer block
+ *
+ * Returns: ---
+ *
+ * Use: Release all of the resources held by a dynamic buffer.
+ */
+
+void dbuf_destroy(dbuf *db)
+{
+ if (db->_b.base) x_free(db->a, db->_b.base);
+ dbuf_create(db);
+}
+
/* --- @buf_break@ --- *
*
* Arguments: @buf *b@ = pointer to a buffer block
void buf_flip(buf *b)
{
- b->limit = b->p;
- b->p = b->base;
+ b->limit = b->p; b->p = b->base;
+ b->f &= ~BF_WRITE;
}
/* --- @buf_ensure@ --- *
int buf_ensure(buf *b, size_t sz) { return (BENSURE(b, sz)); }
+/* --- @buf_tryextend@ --- *
+ *
+ * Arguments: @buf *b@ = pointer to a buffer block
+ * @size_t sz@ = size of data wanted
+ *
+ * Returns: Zero if it worked, nonzero if the buffer won't grow.
+ *
+ * Use: Extend the buffer so that at least @sz@ bytes are available.
+ * This only works if the buffer is allocated.
+ */
+
+int buf_tryextend(buf *b, size_t sz)
+{
+ dbuf *db;
+ size_t newsz, len;
+
+ if (~b->f&(BF_ALLOC | BF_WRITE))
+ { b->f |= BF_BROKEN; return (-1); }
+ db = (dbuf *)b;
+ len = BLEN(&db->_b); sz += len;
+ if (db->sz >= sz)
+ newsz = db->sz;
+ else {
+ newsz = db->sz ? 2*db->sz : 64;
+ while (newsz < sz) { assert(newsz < ((size_t)-1)/2); newsz *= 2; }
+ if (!db->_b.base) db->_b.base = x_alloc(db->a, newsz);
+ else db->_b.base = x_realloc(db->a, db->_b.base, newsz, db->sz);
+ db->_b.p = db->_b.base + len; db->sz = newsz;
+ }
+ db->_b.limit = db->_b.base + newsz;
+ return (0);
+}
+
/* --- @buf_get@ --- *
*
* Arguments: @buf *b@ = pointer to a buffer block
}
DOUINTCONV(BUF_GETU_)
+/* --- @buf_getk64{,l,b}@ --- *
+ *
+ * Arguments: @buf *b@ = pointer to a buffer block
+ * @kludge64 *w@ = where to put the word
+ *
+ * Returns: Zero if OK, or nonzero if there wasn't a word there.
+ *
+ * Use: Gets a word of appropriate size and order from a buffer.
+ */
+
+int buf_getk64(buf *b, kludge64 *w)
+{
+ if (BENSURE(b, 8)) return (-1);
+ LOAD64_(*w, b->p); BSTEP(b, 8); return (0);
+}
+
+int buf_getk64l(buf *b, kludge64 *w)
+{
+ if (BENSURE(b, 8)) return (-1);
+ LOAD64_L_(*w, b->p); BSTEP(b, 8); return (0);
+}
+
+int buf_getk64b(buf *b, kludge64 *w)
+{
+ if (BENSURE(b, 8)) return (-1);
+ LOAD64_B_(*w, b->p); BSTEP(b, 8); return (0);
+}
+
/* --- @buf_putu{8,{16,24,32,64}{,l,b}}@ --- *
*
* Arguments: @buf *b@ = pointer to a buffer block
}
DOUINTCONV(BUF_PUTU_)
+/* --- @buf_putk64{,l,b}@ --- *
+ *
+ * Arguments: @buf *b@ = pointer to a buffer block
+ * @kludge64 w@ = word to write
+ *
+ * Returns: Zero if OK, or nonzero if there wasn't enough space
+ *
+ * Use: Gets a word of appropriate size and order from a buffer.
+ */
+
+int buf_putk64(buf *b, kludge64 w)
+{
+ if (BENSURE(b, 8)) return (-1);
+ STORE64_(b->p, w); BSTEP(b, 8); return (0);
+}
+
+int buf_putk64l(buf *b, kludge64 w)
+{
+ if (BENSURE(b, 8)) return (-1);
+ STORE64_L_(b->p, w); BSTEP(b, 8); return (0);
+}
+
+int buf_putk64b(buf *b, kludge64 w)
+{
+ if (BENSURE(b, 8)) return (-1);
+ STORE64_B_(b->p, w); BSTEP(b, 8); return (0);
+}
+
/* --- @findz@ --- *
*
* Arguments: @buf *b@ = pointer to a buffer block
return (buf_get(b, *nn));
}
+#ifndef HAVE_UINT64
+
+static void *getmem_k64(buf *b, size_t *nn_out, kludge64 k)
+{
+ kludge64 szmax;
+ size_t n;
+
+ ASSIGN64(szmax, (size_t)-1);
+ if (CMP64(k, >, szmax)) { buf_break(b); return (-1); }
+ n = GET64(size_t, k); *nn_out = n; return (buf_get(b, n));
+}
+
+void *buf_getmem64(buf *b, size_t *nn)
+{
+ kludge64 k;
+
+ if (buf_getk64(b, &k)) return (-1);
+ return (getmem_k64(b, nn, k));
+}
+
+void *buf_getmem64b(buf *b, size_t *nn)
+{
+ kludge64 k;
+
+ if (buf_getk64b(b, &k)) return (-1);
+ return (getmem_k64(b, nn, k));
+}
+
+void *buf_getmem64l(buf *b, size_t *nn)
+{
+ kludge64 k;
+
+ if (buf_getk64l(b, &k)) return (-1);
+ return (getmem_k64(b, nn, k));
+}
+
+#endif
+
/* --- @buf_putmem{8,{16,24,32,64}{,l,b},z} --- *
*
* Arguments: @buf *b@ = pointer to a buffer block
}
DOUINTCONV(BUF_PUTMEM_)
+#ifndef HAVE_UINT64
+
+void *buf_putmem64(buf *b, const void *p, size_t n)
+{
+ kludge64 k;
+
+ ASSIGN64(k, n); if (buf_putk64(b, k) || buf_put(b, p, n)) return (-1);
+ return (0);
+}
+
+void *buf_putmem64b(buf *b, const void *p, size_t n)
+{
+ kludge64 k;
+
+ ASSIGN64(k, n); if (buf_putk64b(b, k) || buf_put(b, p, n)) return (-1);
+ return (0);
+}
+
+void *buf_putmem64l(buf *b, const void *p, size_t n)
+{
+ kludge64 k;
+
+ ASSIGN64(k, n); if (buf_putk64l(b, k) || buf_put(b, p, n)) return (-1);
+ return (0);
+}
+
+#endif
+
int buf_putmemz(buf *b, const void *p, size_t n)
{
octet *q;
~mdw / mLib / blobdiff