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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/document/base/globalid.h>
#include <vespa/vespalib/util/exceptions.h>
#include <vespa/vespalib/stllike/asciistream.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/stllike/hash_set.hpp>
#include <cassert>
namespace {
bool
validateHex(char c)
{
return
(c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F');
}
uint16_t
getHexVal(char c)
{
if (c >= '0' && c <= '9') {
return (c - '0');
} else if (c >= 'a' && c <= 'f') {
return (c - 'a' + 10);
} else if (c >= 'A' && c <= 'F') {
return (c - 'A' + 10);
}
assert(validateHex(c));
abort();
}
}
namespace document {
bool
GlobalId::BucketOrderCmp::operator()(const GlobalId &lhs, const GlobalId &rhs) const
{
const unsigned char * __restrict__ a = lhs._gid._buffer;
const unsigned char * __restrict__ b = rhs._gid._buffer;
int diff;
if ((diff = compare(a[0], b[0])) != 0) {
return diff < 0;
}
if ((diff = compare(a[1], b[1])) != 0) {
return diff < 0;
}
if ((diff = compare(a[2], b[2])) != 0) {
return diff < 0;
}
if ((diff = compare(a[3], b[3])) != 0) {
return diff < 0;
}
if ((diff = compare(a[8], b[8])) != 0) {
return diff < 0;
}
if ((diff = compare(a[9], b[9])) != 0) {
return diff < 0;
}
if ((diff = compare(a[10], b[10])) != 0) {
return diff < 0;
}
if ((diff = compare(a[11], b[11])) != 0) {
return diff < 0;
}
return lhs < rhs;
}
vespalib::string GlobalId::toString() const {
vespalib::asciistream out;
out << "gid(0x" << vespalib::hex;
for (int i = 0; i < (int)LENGTH; ++i) {
unsigned short s1 = _gid._buffer[i] >> 4;
unsigned short s2 = _gid._buffer[i] & 0xF;
out << s1 << s2;
}
out << ")" << vespalib::dec;
return out.str();
}
GlobalId
GlobalId::parse(const vespalib::stringref & source)
{
if (source.substr(0, 6) != "gid(0x") {
throw vespalib::IllegalArgumentException(
"A gid must start with \"gid(0x\". Invalid source: '" + source
+ "'.", VESPA_STRLOC);
}
if (source.size() != 2 * LENGTH + 7) {
vespalib::asciistream ost;
ost << "A gid string representation must be exactly "
<< (2 * LENGTH + 7) << " bytes long. Invalid source: '"
<< source << "'.";
throw vespalib::IllegalArgumentException(ost.str(), VESPA_STRLOC);
}
if (source.substr(2 * LENGTH + 6, 1) != ")") {
throw vespalib::IllegalArgumentException(
"A gid must end in \")\". Invalid source: '" + source
+ "'.", VESPA_STRLOC);
}
GlobalId id;
for (uint32_t i = 0; i < LENGTH; ++i) {
char c1 = source[6 + 2*i];
char c2 = source[6 + 2*i + 1];
if (!validateHex(c1) || !validateHex(c2)) {
throw vespalib::IllegalArgumentException(
"A gid can only contain hexidecimal characters [0-9a-fA-F]."
" Invalid source: '" + source + "'.", VESPA_STRLOC);
}
id._gid._buffer[i] = (getHexVal(c1) << 4) | getHexVal(c2);
/*
std::cerr << "Hexval of " << source[6 + 2*i] << " and "
<< source[6 + 2*i + 1] << " is " << getHexVal(c1) << " and "
<< getHexVal(c2) << ", which forms the byte "
<< (int) id._gid._buffer[i] << "\n";
*/
}
return id;
}
bool
GlobalId::containedInBucket(const BucketId &bucket) const
{
return bucket.contains(convertToBucketId());
}
GlobalId
GlobalId::calculateFirstInBucket(const BucketId& bucket)
{
//std::cerr << "First: Calculating gid from " << bucket << "\n" << std::hex;
BucketId::Type location, gid;
uint32_t usedBits(bucket.getUsedBits());
if (usedBits > 32) {
BucketId::Type gidMask(0x03ffffff00000000ull);
BucketId::Type locationMask(0x00000000ffffffffull);
uint32_t usedGidBits = usedBits - 32;
gidMask = gidMask << (32 - usedGidBits) >> (32 - usedGidBits);
gid = bucket.getRawId() & gidMask;
location = bucket.getRawId() & locationMask;
} else {
BucketId::Type locationMask(0x00000000ffffffffull);
locationMask = locationMask << (64 - usedBits) >> (64 - usedBits);
gid = 0;
location = bucket.getRawId() & locationMask;
}
//std::cerr << "First: Got location " << location << " and gid " << gid
// << "\n";
uint8_t raw[GlobalId::LENGTH];
memcpy(&raw[0], &location, 4);
memcpy(&raw[0] + 4, &gid, 8);
//std::cerr << "First: " << GlobalId(raw) << ", bucket "
// << GlobalId(raw).convertToBucketId() << "\n" << std::dec;
return GlobalId(raw);
}
GlobalId
GlobalId::calculateLastInBucket(const BucketId& bucket)
{
//std::cerr << "Last: Calculating gid from " << bucket << "\n" << std::hex;
BucketId::Type location, gid;
uint32_t usedBits(bucket.getUsedBits());
if (usedBits > 32) {
BucketId::Type gidMask(0x03ffffff00000000ull);
BucketId::Type locationMask(0x00000000ffffffffull);
uint32_t usedGidBits = usedBits - 32;
gidMask = gidMask << (32 - usedGidBits) >> (32 - usedGidBits);
BucketId::Type gidRevMask(gidMask ^ 0xffffffffffffffffull);
gid = (bucket.getRawId() & gidMask) | gidRevMask;
location = bucket.getRawId() & locationMask;
} else {
BucketId::Type locationMask(0x00000000ffffffffull);
locationMask = locationMask << (64 - usedBits) >> (64 - usedBits);
BucketId::Type locationRevMask(locationMask ^ 0xffffffffffffffffull);
gid = 0xffffffffffffffffull;
location = (bucket.getRawId() & locationMask) | locationRevMask;
}
//std::cerr << "Last: Got location " << location << " and gid " << gid
// << "\n";
uint8_t raw[GlobalId::LENGTH];
memcpy(&raw[0], &location, 4);
memcpy(&raw[0] + 4, &gid, 8);
//std::cerr << "Last: " << GlobalId(raw) << ", bucket "
// << GlobalId(raw).convertToBucketId() << "\n" << std::dec;
return GlobalId(raw);
}
vespalib::asciistream & operator << (vespalib::asciistream & os, const GlobalId & gid)
{
return os << gid.toString();
}
std::ostream & operator << (std::ostream & os, const GlobalId & gid)
{
return os << gid.toString();
}
} // document
VESPALIB_HASH_SET_INSTANTIATE_H(document::GlobalId, document::GlobalId::hash);
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