ComputerSurge/bind9
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change from current pointer to current offset, other improvements

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This commit is contained in:
Bob Halley
1999-01-06 05:37:54 +00:00
parent c23afd025e
commit 005df5aba5
2 changed files with 100 additions and 30 deletions
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67
lib/isc/buffer.c
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@@ -1,5 +1,5 @@
/*
* Copyright (C) 1998 Internet Software Consortium.
* Copyright (C) 1998, 1999 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@@ -22,21 +22,52 @@
#include <isc/assertions.h>
#include <isc/buffer.h>
#define VALID_BUFFER(b) ((b) != NULL)
#define VALID_BUFFER(b) ((b) != NULL && \
(b)->magic == BUFFER_MAGIC)
#define BUFFER_MAGIC 0x42756621U /* Buf!. */
void
isc_buffer_init(isc_buffer_t *b, unsigned char *base, unsigned int length) {
isc_buffer_init(isc_buffer_t *b, unsigned char *base, unsigned int length,
unsigned int type) {
/*
* Make 'b' refer to the 'length'-byte region starting at base.
*/
REQUIRE(VALID_BUFFER(b));
REQUIRE(length > 0);
REQUIRE(b != NULL);
b->magic = BUFFER_MAGIC;
b->type = type;
b->base = base;
b->length = length;
b->used = 0;
b->current = base;
b->current = 0;
}
void
isc_buffer_invalidate(isc_buffer_t *b) {
/*
* Make 'b' an invalid buffer.
*/
REQUIRE(VALID_BUFFER(b));
b->magic = 0;
b->type = 0;
b->base = NULL;
b->length = 0;
b->used = 0;
b->current = 0;
}
unsigned int
isc_buffer_type(isc_buffer_t *b) {
/*
* The type of 'b'.
*/
REQUIRE(VALID_BUFFER(b));
return (b->type);
}
void
@@ -110,6 +141,7 @@ isc_buffer_clear(isc_buffer_t *b) {
*/
REQUIRE(VALID_BUFFER(b));
b->used = 0;
}
@@ -123,7 +155,7 @@ isc_buffer_consumed(isc_buffer_t *b, isc_region_t *r) {
REQUIRE(r != NULL);
r->base = b->base;
r->length = (unsigned int)(b->current - b->base);
r->length = b->current;
}
void
@@ -135,8 +167,8 @@ isc_buffer_remaining(isc_buffer_t *b, isc_region_t *r) {
REQUIRE(VALID_BUFFER(b));
REQUIRE(r != NULL);
r->base = b->current;
r->length = (unsigned int)((b->base + b->used) - b->current);
r->base = (unsigned char *)b->base + b->current;
r->length = b->used - b->current;
}
void
@@ -147,17 +179,17 @@ isc_buffer_first(isc_buffer_t *b) {
REQUIRE(VALID_BUFFER(b));
b->current = b->base;
b->current = 0;
}
void
isc_buffer_forward(isc_buffer_t *b, unsigned int n) {
/*
* Decrease the 'used' region of 'b' by 'n' bytes.
* Increase the 'consumed' region of 'b' by 'n' bytes.
*/
REQUIRE(VALID_BUFFER(b));
REQUIRE(b->current + n <= b->base + b->used);
REQUIRE(b->current + n <= b->used);
b->current += n;
}
@@ -169,7 +201,7 @@ isc_buffer_back(isc_buffer_t *b, unsigned int n) {
*/
REQUIRE(VALID_BUFFER(b));
REQUIRE(b->base + n <= b->current);
REQUIRE(n <= b->current);
b->current -= n;
}
@@ -177,6 +209,7 @@ isc_buffer_back(isc_buffer_t *b, unsigned int 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
@@ -186,10 +219,10 @@ isc_buffer_compact(isc_buffer_t *b) {
REQUIRE(VALID_BUFFER(b));
length = (unsigned int)((b->base + b->used) - b->current);
src = (unsigned char *)b->base + b->current;
length = b->used - b->current;
(void)memmove(b->base, src, (size_t)length);
(void)memmove(b->base, b->current, length);
b->current = b->base;
b->current = 0;
b->used = length;
}