179 lines
3.6 KiB
C
179 lines
3.6 KiB
C
/*
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* buffer.c -- generic memory buffer .
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*
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* Copyright (c) 2001-2008, NLnet Labs. All rights reserved.
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*
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* See LICENSE for the license.
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*
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*/
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/**
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* \file
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*
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* This file contains the definition of sldns_buffer, and functions to manipulate those.
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*/
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#include "config.h"
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#include "ldns/sbuffer.h"
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#include <stdarg.h>
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sldns_buffer *
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sldns_buffer_new(size_t capacity)
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{
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sldns_buffer *buffer = (sldns_buffer*)malloc(sizeof(sldns_buffer));
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if (!buffer) {
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return NULL;
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}
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buffer->_data = (uint8_t *) malloc(capacity);
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if (!buffer->_data) {
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free(buffer);
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return NULL;
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}
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buffer->_position = 0;
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buffer->_limit = buffer->_capacity = capacity;
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buffer->_fixed = 0;
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buffer->_status_err = 0;
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sldns_buffer_invariant(buffer);
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return buffer;
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}
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void
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sldns_buffer_new_frm_data(sldns_buffer *buffer, void *data, size_t size)
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{
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assert(data != NULL);
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buffer->_position = 0;
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buffer->_limit = buffer->_capacity = size;
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buffer->_fixed = 0;
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buffer->_data = malloc(size);
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if(!buffer->_data) {
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buffer->_status_err = 1;
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return;
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}
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memcpy(buffer->_data, data, size);
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buffer->_status_err = 0;
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sldns_buffer_invariant(buffer);
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}
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void
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sldns_buffer_init_frm_data(sldns_buffer *buffer, void *data, size_t size)
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{
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memset(buffer, 0, sizeof(*buffer));
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buffer->_data = data;
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buffer->_capacity = buffer->_limit = size;
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buffer->_fixed = 1;
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}
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int
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sldns_buffer_set_capacity(sldns_buffer *buffer, size_t capacity)
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{
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void *data;
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sldns_buffer_invariant(buffer);
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assert(buffer->_position <= capacity);
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data = (uint8_t *) realloc(buffer->_data, capacity);
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if (!data) {
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buffer->_status_err = 1;
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return 0;
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} else {
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buffer->_data = data;
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buffer->_limit = buffer->_capacity = capacity;
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return 1;
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}
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}
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int
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sldns_buffer_reserve(sldns_buffer *buffer, size_t amount)
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{
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sldns_buffer_invariant(buffer);
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assert(!buffer->_fixed);
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if (buffer->_capacity < buffer->_position + amount) {
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size_t new_capacity = buffer->_capacity * 3 / 2;
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if (new_capacity < buffer->_position + amount) {
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new_capacity = buffer->_position + amount;
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}
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if (!sldns_buffer_set_capacity(buffer, new_capacity)) {
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buffer->_status_err = 1;
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return 0;
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}
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}
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buffer->_limit = buffer->_capacity;
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return 1;
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}
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int
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sldns_buffer_printf(sldns_buffer *buffer, const char *format, ...)
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{
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va_list args;
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int written = 0;
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size_t remaining;
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if (sldns_buffer_status_ok(buffer)) {
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sldns_buffer_invariant(buffer);
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assert(buffer->_limit == buffer->_capacity);
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remaining = sldns_buffer_remaining(buffer);
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va_start(args, format);
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written = vsnprintf((char *) sldns_buffer_current(buffer), remaining,
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format, args);
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va_end(args);
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if (written == -1) {
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buffer->_status_err = 1;
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return -1;
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} else if ((size_t) written >= remaining) {
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if (!sldns_buffer_reserve(buffer, (size_t) written + 1)) {
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buffer->_status_err = 1;
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return -1;
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}
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va_start(args, format);
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written = vsnprintf((char *) sldns_buffer_current(buffer),
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sldns_buffer_remaining(buffer), format, args);
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va_end(args);
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if (written == -1) {
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buffer->_status_err = 1;
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return -1;
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}
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}
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buffer->_position += written;
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}
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return written;
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}
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void
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sldns_buffer_free(sldns_buffer *buffer)
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{
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if (!buffer) {
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return;
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}
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if (!buffer->_fixed)
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free(buffer->_data);
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free(buffer);
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}
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void *
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sldns_buffer_export(sldns_buffer *buffer)
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{
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buffer->_fixed = 1;
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return buffer->_data;
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}
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void
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sldns_buffer_copy(sldns_buffer* result, sldns_buffer* from)
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{
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size_t tocopy = sldns_buffer_limit(from);
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if(tocopy > sldns_buffer_capacity(result))
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tocopy = sldns_buffer_capacity(result);
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sldns_buffer_clear(result);
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sldns_buffer_write(result, sldns_buffer_begin(from), tocopy);
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sldns_buffer_flip(result);
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}
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