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- Copyright (C) 2000, 2001, 2004, 2005, 2007, 2014-2016, 2018-2020 Internet Systems Consortium, Inc. ("ISC")
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-
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- This Source Code Form is subject to the terms of the Mozilla Public
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- License, v. 2.0. If a copy of the MPL was not distributed with this
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- file, You can obtain one at http://mozilla.org/MPL/2.0/.
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-->
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>lwres_buffer</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Name
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lwres_buffer_init,
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lwres_buffer_invalidate,
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lwres_buffer_add,
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lwres_buffer_subtract,
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lwres_buffer_clear,
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lwres_buffer_first,
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lwres_buffer_forward,
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lwres_buffer_back,
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lwres_buffer_getuint8,
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lwres_buffer_putuint8,
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lwres_buffer_getuint16,
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lwres_buffer_putuint16,
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lwres_buffer_getuint32,
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lwres_buffer_putuint32,
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lwres_buffer_putmem,
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lwres_buffer_getmem
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— lightweight resolver buffer management
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Synopsis
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#include <lwres/lwbuffer.h>
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void
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lwres_buffer_init(
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lwres_buffer_t *b,
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void *base,
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unsigned int length);
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void
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lwres_buffer_invalidate(
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lwres_buffer_t *b);
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void
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lwres_buffer_add(
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lwres_buffer_t *b,
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unsigned int n);
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void
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lwres_buffer_subtract(
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lwres_buffer_t *b,
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unsigned int n);
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void
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lwres_buffer_clear(
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lwres_buffer_t *b);
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void
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lwres_buffer_first(
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lwres_buffer_t *b);
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void
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lwres_buffer_forward(
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lwres_buffer_t *b,
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unsigned int n);
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void
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lwres_buffer_back(
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lwres_buffer_t *b,
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unsigned int n);
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uint8_t
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lwres_buffer_getuint8(
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lwres_buffer_t *b);
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void
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lwres_buffer_putuint8(
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lwres_buffer_t *b,
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uint8_t val);
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uint16_t
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lwres_buffer_getuint16(
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lwres_buffer_t *b);
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void
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lwres_buffer_putuint16(
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lwres_buffer_t *b,
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uint16_t val);
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uint32_t
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lwres_buffer_getuint32(
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lwres_buffer_t *b);
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void
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lwres_buffer_putuint32(
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lwres_buffer_t *b,
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uint32_t val);
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void
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lwres_buffer_putmem(
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lwres_buffer_t *b,
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const unsigned char *base,
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unsigned int length);
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void
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lwres_buffer_getmem(
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lwres_buffer_t *b,
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unsigned char *base,
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unsigned int length);
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DESCRIPTION
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These functions provide bounds checked access to a region of memory
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where data is being read or written.
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They are based on, and similar to, the
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isc_buffer_
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functions in the ISC library.
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A buffer is a region of memory, together with a set of related
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subregions.
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The used region and the
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available region are disjoint, and
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their union is the buffer's region.
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The used region extends from the beginning of the buffer region to the
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last used byte.
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The available region extends from one byte greater than the last used
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byte to the end of the buffer's region.
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The size of the used region can be changed using various
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buffer commands.
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Initially, the used region is empty.
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The used region is further subdivided into two disjoint regions: the
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consumed region and the remaining region.
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The union of these two regions is the used region.
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The consumed region extends from the beginning of the used region to
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the byte before the current offset (if any).
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The remaining region the current pointer to the end
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of the used
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region.
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The size of the consumed region can be changed using various
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buffer commands.
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Initially, the consumed region is empty.
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The active region is an (optional) subregion of the
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remaining
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region.
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It extends from the current offset to an offset in the
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remaining region.
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Initially, the active region is empty.
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If the current offset advances beyond the chosen offset,
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the active region will also be empty.
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/------------entire length---------------\\
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/----- used region -----\\/-- available --\\
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+----------------------------------------+
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| consumed | remaining | |
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+----------------------------------------+
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a b c d e
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a == base of buffer.
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b == current pointer. Can be anywhere between a and d.
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c == active pointer. Meaningful between b and d.
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d == used pointer.
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e == length of buffer.
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a-e == entire length of buffer.
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a-d == used region.
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a-b == consumed region.
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b-d == remaining region.
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b-c == optional active region.
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lwres_buffer_init()
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initializes the
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lwres_buffer_t
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*b
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and associates it with the memory region of size
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length
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bytes starting at location
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base.
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lwres_buffer_invalidate()
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marks the buffer *b
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as invalid. Invalidating a buffer after use is not required,
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but makes it possible to catch its possible accidental use.
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The functions
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lwres_buffer_add()
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and
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lwres_buffer_subtract()
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respectively increase and decrease the used space in
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buffer
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*b
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by
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n
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bytes.
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lwres_buffer_add()
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checks for buffer overflow and
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lwres_buffer_subtract()
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checks for underflow.
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These functions do not allocate or deallocate memory.
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They just change the value of
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used.
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A buffer is re-initialised by
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lwres_buffer_clear().
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The function sets
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used,
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current
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and
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active
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to zero.
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lwres_buffer_first
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makes the consumed region of buffer
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*p
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empty by setting
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current
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to zero (the start of the buffer).
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lwres_buffer_forward()
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increases the consumed region of buffer
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*b
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by
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n
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bytes, checking for overflow.
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Similarly,
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lwres_buffer_back()
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decreases buffer
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b's
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consumed region by
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n
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bytes and checks for underflow.
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lwres_buffer_getuint8()
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reads an unsigned 8-bit integer from
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*b
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and returns it.
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lwres_buffer_putuint8()
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writes the unsigned 8-bit integer
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val
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to buffer
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*b.
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lwres_buffer_getuint16()
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and
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lwres_buffer_getuint32()
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are identical to
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lwres_buffer_putuint8()
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except that they respectively read an unsigned 16-bit or 32-bit integer
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in network byte order from
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b.
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Similarly,
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lwres_buffer_putuint16()
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and
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lwres_buffer_putuint32()
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writes the unsigned 16-bit or 32-bit integer
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val
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to buffer
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b,
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in network byte order.
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Arbitrary amounts of data are read or written from a lightweight
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resolver buffer with
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lwres_buffer_getmem()
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and
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lwres_buffer_putmem()
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respectively.
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lwres_buffer_putmem()
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copies
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length
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bytes of memory at
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base
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to
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b.
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Conversely,
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lwres_buffer_getmem()
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copies
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length
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bytes of memory from
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b
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to
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base.
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</body>
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</html>
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