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-rw-r--r--contrib/ntp/lib/isc/buffer.c489
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diff --git a/contrib/ntp/lib/isc/buffer.c b/contrib/ntp/lib/isc/buffer.c
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+/*
+ * 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);
+}
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