1 files changed, 489 insertions, 0 deletions
diff --git a/lib/isc/buffer.c b/lib/isc/buffer.c
new file mode 100644
index 0000000..1b59e65
--- /dev/null
+++ b/lib/isc/buffer.c
@@ -0,0 +1,489 @@
+/*
+ * Copyright (C) 2004-2008  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1998-2002  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: buffer.c,v 1.49 2008/09/25 04:02:39 tbox Exp $ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <isc/buffer.h>
+#include <isc/mem.h>
+#include <isc/region.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+void
+isc__buffer_init(isc_buffer_t *b, const void *base, unsigned int length) {
+	/*
+	 * Make 'b' refer to the 'length'-byte region starting at 'base'.
+	 * XXXDCL see the comment in buffer.h about base being const.
+	 */
+
+	REQUIRE(b != NULL);
+
+	ISC__BUFFER_INIT(b, base, length);
+}
+
+void
+isc__buffer_initnull(isc_buffer_t *b) {
+	/*
+	 * Initialize a new buffer which has no backing store.  This can
+	 * later be grown as needed and swapped in place.
+	 */
+
+	ISC__BUFFER_INIT(b, NULL, 0);
+}
+
+void
+isc_buffer_reinit(isc_buffer_t *b, void *base, unsigned int length) {
+	/*
+	 * Re-initialize the buffer enough to reconfigure the base of the
+	 * buffer.  We will swap in the new buffer, after copying any
+	 * data we contain into the new buffer and adjusting all of our
+	 * internal pointers.
+	 *
+	 * The buffer must not be smaller than the length of the original
+	 * buffer.
+	 */
+	REQUIRE(b->length <= length);
+	REQUIRE(base != NULL);
+
+	(void)memmove(base, b->base, b->length);
+	b->base = base;
+	b->length = length;
+}
+
+void
+isc__buffer_invalidate(isc_buffer_t *b) {
+	/*
+	 * Make 'b' an invalid buffer.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(!ISC_LINK_LINKED(b, link));
+	REQUIRE(b->mctx == NULL);
+
+	ISC__BUFFER_INVALIDATE(b);
+}
+
+void
+isc__buffer_region(isc_buffer_t *b, isc_region_t *r) {
+	/*
+	 * Make 'r' refer to the region of 'b'.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	ISC__BUFFER_REGION(b, r);
+}
+
+void
+isc__buffer_usedregion(isc_buffer_t *b, isc_region_t *r) {
+	/*
+	 * Make 'r' refer to the used region of 'b'.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	ISC__BUFFER_USEDREGION(b, r);
+}
+
+void
+isc__buffer_availableregion(isc_buffer_t *b, isc_region_t *r) {
+	/*
+	 * Make 'r' refer to the available region of 'b'.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	ISC__BUFFER_AVAILABLEREGION(b, r);
+}
+
+void
+isc__buffer_add(isc_buffer_t *b, unsigned int n) {
+	/*
+	 * Increase the 'used' region of 'b' by 'n' bytes.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + n <= b->length);
+
+	ISC__BUFFER_ADD(b, n);
+}
+
+void
+isc__buffer_subtract(isc_buffer_t *b, unsigned int n) {
+	/*
+	 * Decrease the 'used' region of 'b' by 'n' bytes.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used >= n);
+
+	ISC__BUFFER_SUBTRACT(b, n);
+}
+
+void
+isc__buffer_clear(isc_buffer_t *b) {
+	/*
+	 * Make the used region empty.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+
+	ISC__BUFFER_CLEAR(b);
+}
+
+void
+isc__buffer_consumedregion(isc_buffer_t *b, isc_region_t *r) {
+	/*
+	 * Make 'r' refer to the consumed region of 'b'.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	ISC__BUFFER_CONSUMEDREGION(b, r);
+}
+
+void
+isc__buffer_remainingregion(isc_buffer_t *b, isc_region_t *r) {
+	/*
+	 * Make 'r' refer to the remaining region of 'b'.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	ISC__BUFFER_REMAININGREGION(b, r);
+}
+
+void
+isc__buffer_activeregion(isc_buffer_t *b, isc_region_t *r) {
+	/*
+	 * Make 'r' refer to the active region of 'b'.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	ISC__BUFFER_ACTIVEREGION(b, r);
+}
+
+void
+isc__buffer_setactive(isc_buffer_t *b, unsigned int n) {
+	/*
+	 * Sets the end of the active region 'n' bytes after current.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->current + n <= b->used);
+
+	ISC__BUFFER_SETACTIVE(b, n);
+}
+
+void
+isc__buffer_first(isc_buffer_t *b) {
+	/*
+	 * Make the consumed region empty.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+
+	ISC__BUFFER_FIRST(b);
+}
+
+void
+isc__buffer_forward(isc_buffer_t *b, unsigned int n) {
+	/*
+	 * Increase the 'consumed' region of 'b' by 'n' bytes.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->current + n <= b->used);
+
+	ISC__BUFFER_FORWARD(b, n);
+}
+
+void
+isc__buffer_back(isc_buffer_t *b, unsigned int n) {
+	/*
+	 * Decrease the 'consumed' region of 'b' by 'n' bytes.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(n <= b->current);
+
+	ISC__BUFFER_BACK(b, n);
+}
+
+void
+isc_buffer_compact(isc_buffer_t *b) {
+	unsigned int length;
+	void *src;
+
+	/*
+	 * Compact the used region by moving the remaining region so it occurs
+	 * at the start of the buffer.  The used region is shrunk by the size
+	 * of the consumed region, and the consumed region is then made empty.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+
+	src = isc_buffer_current(b);
+	length = isc_buffer_remaininglength(b);
+	(void)memmove(b->base, src, (size_t)length);
+
+	if (b->active > b->current)
+		b->active -= b->current;
+	else
+		b->active = 0;
+	b->current = 0;
+	b->used = length;
+}
+
+isc_uint8_t
+isc_buffer_getuint8(isc_buffer_t *b) {
+	unsigned char *cp;
+	isc_uint8_t result;
+
+	/*
+	 * Read an unsigned 8-bit integer from 'b' and return it.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used - b->current >= 1);
+
+	cp = isc_buffer_current(b);
+	b->current += 1;
+	result = ((isc_uint8_t)(cp[0]));
+
+	return (result);
+}
+
+void
+isc__buffer_putuint8(isc_buffer_t *b, isc_uint8_t val) {
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + 1 <= b->length);
+
+	ISC__BUFFER_PUTUINT8(b, val);
+}
+
+isc_uint16_t
+isc_buffer_getuint16(isc_buffer_t *b) {
+	unsigned char *cp;
+	isc_uint16_t result;
+
+	/*
+	 * Read an unsigned 16-bit integer in network byte order from 'b',
+	 * convert it to host byte order, and return it.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used - b->current >= 2);
+
+	cp = isc_buffer_current(b);
+	b->current += 2;
+	result = ((unsigned int)(cp[0])) << 8;
+	result |= ((unsigned int)(cp[1]));
+
+	return (result);
+}
+
+void
+isc__buffer_putuint16(isc_buffer_t *b, isc_uint16_t val) {
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + 2 <= b->length);
+
+	ISC__BUFFER_PUTUINT16(b, val);
+}
+
+void
+isc__buffer_putuint24(isc_buffer_t *b, isc_uint32_t val) {
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + 3 <= b->length);
+
+	ISC__BUFFER_PUTUINT24(b, val);
+}
+
+isc_uint32_t
+isc_buffer_getuint32(isc_buffer_t *b) {
+	unsigned char *cp;
+	isc_uint32_t result;
+
+	/*
+	 * Read an unsigned 32-bit integer in network byte order from 'b',
+	 * convert it to host byte order, and return it.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used - b->current >= 4);
+
+	cp = isc_buffer_current(b);
+	b->current += 4;
+	result = ((unsigned int)(cp[0])) << 24;
+	result |= ((unsigned int)(cp[1])) << 16;
+	result |= ((unsigned int)(cp[2])) << 8;
+	result |= ((unsigned int)(cp[3]));
+
+	return (result);
+}
+
+void
+isc__buffer_putuint32(isc_buffer_t *b, isc_uint32_t val) {
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + 4 <= b->length);
+
+	ISC__BUFFER_PUTUINT32(b, val);
+}
+
+isc_uint64_t
+isc_buffer_getuint48(isc_buffer_t *b) {
+	unsigned char *cp;
+	isc_uint64_t result;
+
+	/*
+	 * Read an unsigned 48-bit integer in network byte order from 'b',
+	 * convert it to host byte order, and return it.
+	 */
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used - b->current >= 6);
+
+	cp = isc_buffer_current(b);
+	b->current += 6;
+	result = ((isc_int64_t)(cp[0])) << 40;
+	result |= ((isc_int64_t)(cp[1])) << 32;
+	result |= ((isc_int64_t)(cp[2])) << 24;
+	result |= ((isc_int64_t)(cp[3])) << 16;
+	result |= ((isc_int64_t)(cp[4])) << 8;
+	result |= ((isc_int64_t)(cp[5]));
+
+	return (result);
+}
+
+void
+isc__buffer_putuint48(isc_buffer_t *b, isc_uint64_t val) {
+	isc_uint16_t valhi;
+	isc_uint32_t vallo;
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + 6 <= b->length);
+
+	valhi = (isc_uint16_t)(val >> 32);
+	vallo = (isc_uint32_t)(val & 0xFFFFFFFF);
+	ISC__BUFFER_PUTUINT16(b, valhi);
+	ISC__BUFFER_PUTUINT32(b, vallo);
+}
+
+void
+isc__buffer_putmem(isc_buffer_t *b, const unsigned char *base,
+		   unsigned int length)
+{
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(b->used + length <= b->length);
+
+	ISC__BUFFER_PUTMEM(b, base, length);
+}
+
+void
+isc__buffer_putstr(isc_buffer_t *b, const char *source) {
+	unsigned int l;
+	unsigned char *cp;
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(source != NULL);
+
+	/*
+	 * Do not use ISC__BUFFER_PUTSTR(), so strlen is only done once.
+	 */
+	l = strlen(source);
+
+	REQUIRE(l <= isc_buffer_availablelength(b));
+
+	cp = isc_buffer_used(b);
+	memcpy(cp, source, l);
+	b->used += l;
+}
+
+isc_result_t
+isc_buffer_copyregion(isc_buffer_t *b, const isc_region_t *r) {
+	unsigned char *base;
+	unsigned int available;
+
+	REQUIRE(ISC_BUFFER_VALID(b));
+	REQUIRE(r != NULL);
+
+	/*
+	 * XXXDCL
+	 */
+	base = isc_buffer_used(b);
+	available = isc_buffer_availablelength(b);
+	if (r->length > available)
+		return (ISC_R_NOSPACE);
+	memcpy(base, r->base, r->length);
+	b->used += r->length;
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_buffer_allocate(isc_mem_t *mctx, isc_buffer_t **dynbuffer,
+		    unsigned int length)
+{
+	isc_buffer_t *dbuf;
+
+	REQUIRE(dynbuffer != NULL);
+	REQUIRE(*dynbuffer == NULL);
+
+	dbuf = isc_mem_get(mctx, length + sizeof(isc_buffer_t));
+	if (dbuf == NULL)
+		return (ISC_R_NOMEMORY);
+
+	isc_buffer_init(dbuf, ((unsigned char *)dbuf) + sizeof(isc_buffer_t),
+			length);
+	dbuf->mctx = mctx;
+
+	*dynbuffer = dbuf;
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_buffer_free(isc_buffer_t **dynbuffer) {
+	unsigned int real_length;
+	isc_buffer_t *dbuf;
+	isc_mem_t *mctx;
+
+	REQUIRE(dynbuffer != NULL);
+	REQUIRE(ISC_BUFFER_VALID(*dynbuffer));
+	REQUIRE((*dynbuffer)->mctx != NULL);
+
+	dbuf = *dynbuffer;
+	*dynbuffer = NULL;	/* destroy external reference */
+
+	real_length = dbuf->length + sizeof(isc_buffer_t);
+	mctx = dbuf->mctx;
+	dbuf->mctx = NULL;
+	isc_buffer_invalidate(dbuf);
+
+	isc_mem_put(mctx, dbuf, real_length);
+}