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/** @file
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "Range.h"
#include "slice.h"
#include <algorithm>
#include <cinttypes>
#include <cctype>
#include <cstdio>
#include <cstring>
bool
Range::isValid() const
{
return m_beg < m_end && (0 <= m_beg || 0 == m_end);
}
int64_t
Range::size() const
{
return m_end - m_beg;
}
bool
Range::fromStringClosed(char const *const rangestr)
{
static char const *const BYTESTR = "bytes=";
static size_t const BYTESTRLEN = strlen(BYTESTR);
m_beg = m_end = -1; // initialize invalid
// make sure this is in byte units
if (0 != strncmp(BYTESTR, rangestr, BYTESTRLEN)) {
return false;
}
// advance past any white space
char const *pstr = rangestr + BYTESTRLEN;
while ('\0' != *pstr && isblank(*pstr)) {
++pstr;
}
// rip out any whitespace
char rangebuf[1024];
int const rangelen = sizeof(rangebuf);
char *pbuf = rangebuf;
while ('\0' != *pstr && (pbuf - rangebuf) < rangelen) {
if (!isblank(*pstr)) {
*pbuf++ = *pstr;
}
++pstr;
}
*pbuf = '\0';
int const rlen = (pbuf - rangebuf);
int consumed = 0;
// last 'n' bytes - result in range with negative begin and 0 end
int64_t endbytes = 0;
char const *const fmtend = "-%" PRId64 "%n";
int const fieldsend = sscanf(rangebuf, fmtend, &endbytes, &consumed);
if (1 == fieldsend) {
if (rlen == consumed) {
m_beg = -endbytes;
m_end = 0;
return true;
} else {
return false;
}
}
// normal range <front>-<back>
char const *const fmtclosed = "%" PRId64 "-%" PRId64 "%n";
int64_t front = 0;
int64_t back = 0;
int const fieldsclosed = sscanf(rangebuf, fmtclosed, &front, &back, &consumed);
if (2 == fieldsclosed) {
if (0 <= front && front <= back && rlen == consumed) {
m_beg = front;
m_end = back + 1;
return true;
} else {
return false;
}
}
front = 0;
char const *const fmtbeg = "%" PRId64 "-%n";
int const fieldsbeg = sscanf(rangebuf, fmtbeg, &front, &consumed);
if (1 == fieldsbeg) {
if (rlen == consumed) {
m_beg = front;
m_end = Range::maxval;
return true;
} else {
return false;
}
}
return false;
} // parseRange
bool
Range::toStringClosed(char *const bufstr,
int *const buflen // returns actual bytes used
) const
{
if (!isValid()) {
if (0 < *buflen) {
bufstr[0] = '\0';
}
*buflen = 0;
return false;
}
int const lenin = *buflen;
if (m_end <= Range::maxval) {
*buflen = snprintf(bufstr, lenin, "bytes=%" PRId64 "-%" PRId64, m_beg, m_end - 1);
} else {
*buflen = snprintf(bufstr, lenin, "bytes=%" PRId64 "-", m_beg);
}
return (0 < *buflen && *buflen < lenin);
}
int64_t
Range::firstBlockFor(int64_t const blocksize) const
{
if (0 < blocksize && isValid()) {
return std::max(static_cast<int64_t>(0), m_beg / blocksize);
} else {
return -1;
}
}
int64_t
Range::lastBlockFor(int64_t const blocksize) const
{
if (0 < blocksize && isValid()) {
return std::max(static_cast<int64_t>(0), (m_end - 1) / blocksize);
} else {
return -1;
}
}
Range
Range::intersectedWith(Range const &other) const
{
return Range(std::max(m_beg, other.m_beg), std::min(m_end, other.m_end));
}
bool
Range::blockIsInside(int64_t const blocksize, int64_t const blocknum) const
{
Range const blockrange(blocksize * blocknum, blocksize * (blocknum + 1));
Range const isec(blockrange.intersectedWith(*this));
return isec.isValid();
}
int64_t
Range::skipBytesForBlock(int64_t const blocksize, int64_t const blocknum) const
{
int64_t const blockstart(blocksize * blocknum);
if (m_beg < blockstart) {
return 0;
} else {
return m_beg - blockstart;
}
}
bool
Range::isEndBytes() const
{
return m_beg < 0 && 0 == m_end;
}
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