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zonedetect.c
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/*
* Copyright (c) 2018, Bertold Van den Bergh ([email protected])
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#if defined(_MSC_VER) || defined(__MINGW32__)
#include <windows.h>
#elif defined(__APPLE__) || defined(__linux__) || defined(__unix__) || defined(_POSIX_VERSION)
#include <errno.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#endif
#include "zonedetect.h"
enum ZDInternalError {
ZD_OK,
ZD_E_DB_OPEN,
ZD_E_DB_SEEK,
ZD_E_DB_MMAP,
#if defined(_MSC_VER) || defined(__MINGW32__)
ZD_E_DB_MMAP_MSVIEW,
ZD_E_DB_MAP_EXCEPTION,
ZD_E_DB_MUNMAP_MSVIEW,
#endif
ZD_E_DB_MUNMAP,
ZD_E_DB_CLOSE,
ZD_E_PARSE_HEADER
};
struct ZoneDetectOpaque {
#if defined(_MSC_VER) || defined(__MINGW32__)
HANDLE fd;
HANDLE fdMap;
int32_t length;
int32_t padding;
#elif defined(__APPLE__) || defined(__linux__) || defined(__unix__) || defined(_POSIX_VERSION)
int fd;
off_t length;
#else
int length;
#endif
uint8_t closeType;
uint8_t *mapping;
uint8_t tableType;
uint8_t version;
uint8_t precision;
uint8_t numFields;
char *notice;
char **fieldNames;
uint32_t bboxOffset;
uint32_t metadataOffset;
uint32_t dataOffset;
};
static void (*zdErrorHandler)(int, int);
static void zdError(enum ZDInternalError errZD, int errNative)
{
if (zdErrorHandler) zdErrorHandler((int)errZD, errNative);
}
static int32_t ZDFloatToFixedPoint(float input, float scale, unsigned int precision)
{
const float inputScaled = input / scale;
return (int32_t)(inputScaled * (float)(1 << (precision - 1)));
}
static float ZDFixedPointToFloat(int32_t input, float scale, unsigned int precision)
{
const float value = (float)input / (float)(1 << (precision - 1));
return value * scale;
}
static unsigned int ZDDecodeVariableLengthUnsigned(const ZoneDetect *library, uint32_t *index, uint64_t *result)
{
if(*index >= (uint32_t)library->length) {
return 0;
}
uint64_t value = 0;
unsigned int i = 0;
#if defined(_MSC_VER)
__try {
#endif
uint8_t *const buffer = library->mapping + *index;
uint8_t *const bufferEnd = library->mapping + library->length - 1;
unsigned int shift = 0;
while(1) {
value |= ((((uint64_t)buffer[i]) & UINT8_C(0x7F)) << shift);
shift += 7u;
if(!(buffer[i] & UINT8_C(0x80))) {
break;
}
i++;
if(buffer + i > bufferEnd) {
return 0;
}
}
#if defined(_MSC_VER)
} __except(GetExceptionCode() == EXCEPTION_IN_PAGE_ERROR
? EXCEPTION_EXECUTE_HANDLER
: EXCEPTION_CONTINUE_SEARCH) { /* file mapping SEH exception occurred */
zdError(ZD_E_DB_MAP_EXCEPTION, (int)GetLastError());
return 0;
}
#endif
i++;
*result = value;
*index += i;
return i;
}
static unsigned int ZDDecodeVariableLengthUnsignedReverse(const ZoneDetect *library, uint32_t *index, uint64_t *result)
{
uint32_t i = *index;
if(*index >= (uint32_t)library->length) {
return 0;
}
#if defined(_MSC_VER)
__try {
#endif
if(library->mapping[i] & UINT8_C(0x80)) {
return 0;
}
if(!i) {
return 0;
}
i--;
while(library->mapping[i] & UINT8_C(0x80)) {
if(!i) {
return 0;
}
i--;
}
#if defined(_MSC_VER)
} __except(GetExceptionCode() == EXCEPTION_IN_PAGE_ERROR
? EXCEPTION_EXECUTE_HANDLER
: EXCEPTION_CONTINUE_SEARCH) { /* file mapping SEH exception occurred */
zdError(ZD_E_DB_MAP_EXCEPTION, (int)GetLastError());
return 0;
}
#endif
*index = i;
i++;
uint32_t i2 = i;
return ZDDecodeVariableLengthUnsigned(library, &i2, result);
}
static int64_t ZDDecodeUnsignedToSigned(uint64_t value)
{
return (value & 1) ? -(int64_t)(value / 2) : (int64_t)(value / 2);
}
static unsigned int ZDDecodeVariableLengthSigned(const ZoneDetect *library, uint32_t *index, int32_t *result)
{
uint64_t value = 0;
const unsigned int retVal = ZDDecodeVariableLengthUnsigned(library, index, &value);
*result = (int32_t)ZDDecodeUnsignedToSigned(value);
return retVal;
}
static char *ZDParseString(const ZoneDetect *library, uint32_t *index)
{
uint64_t strLength;
if(!ZDDecodeVariableLengthUnsigned(library, index, &strLength)) {
return NULL;
}
uint32_t strOffset = *index;
unsigned int remoteStr = 0;
if(strLength >= 256) {
strOffset = library->metadataOffset + (uint32_t)strLength - 256;
remoteStr = 1;
if(!ZDDecodeVariableLengthUnsigned(library, &strOffset, &strLength)) {
return NULL;
}
if(strLength > 256) {
return NULL;
}
}
char *const str = malloc((size_t)(strLength + 1));
if(str) {
#if defined(_MSC_VER)
__try {
#endif
size_t i;
for(i = 0; i < strLength; i++) {
str[i] = (char)(library->mapping[strOffset + i] ^ UINT8_C(0x80));
}
#if defined(_MSC_VER)
} __except(GetExceptionCode() == EXCEPTION_IN_PAGE_ERROR
? EXCEPTION_EXECUTE_HANDLER
: EXCEPTION_CONTINUE_SEARCH) { /* file mapping SEH exception occurred */
zdError(ZD_E_DB_MAP_EXCEPTION, (int)GetLastError());
return 0;
}
#endif
str[strLength] = 0;
}
if(!remoteStr) {
*index += (uint32_t)strLength;
}
return str;
}
static int ZDParseHeader(ZoneDetect *library)
{
if(library->length < 7) {
return -1;
}
#if defined(_MSC_VER)
__try {
#endif
if(memcmp(library->mapping, "PLB", 3)) {
return -1;
}
library->tableType = library->mapping[3];
library->version = library->mapping[4];
library->precision = library->mapping[5];
library->numFields = library->mapping[6];
#if defined(_MSC_VER)
} __except(GetExceptionCode() == EXCEPTION_IN_PAGE_ERROR
? EXCEPTION_EXECUTE_HANDLER
: EXCEPTION_CONTINUE_SEARCH) { /* file mapping SEH exception occurred */
zdError(ZD_E_DB_MAP_EXCEPTION, (int)GetLastError());
return 0;
}
#endif
if(library->version >= 2) {
return -1;
}
uint32_t index = UINT32_C(7);
library->fieldNames = malloc(library->numFields * sizeof *library->fieldNames);
if (!library->fieldNames) {
return -1;
}
size_t i;
for(i = 0; i < library->numFields; i++) {
library->fieldNames[i] = ZDParseString(library, &index);
}
library->notice = ZDParseString(library, &index);
if(!library->notice) {
return -1;
}
uint64_t tmp;
/* Read section sizes */
/* By memset: library->bboxOffset = 0 */
if(!ZDDecodeVariableLengthUnsigned(library, &index, &tmp)) return -1;
library->metadataOffset = (uint32_t)tmp + library->bboxOffset;
if(!ZDDecodeVariableLengthUnsigned(library, &index, &tmp))return -1;
library->dataOffset = (uint32_t)tmp + library->metadataOffset;
if(!ZDDecodeVariableLengthUnsigned(library, &index, &tmp)) return -1;
/* Add header size to everything */
library->bboxOffset += index;
library->metadataOffset += index;
library->dataOffset += index;
/* Verify file length */
if(tmp + library->dataOffset != (uint32_t)library->length) {
return -2;
}
return 0;
}
static int ZDPointInBox(int32_t xl, int32_t x, int32_t xr, int32_t yl, int32_t y, int32_t yr)
{
if((xl <= x && x <= xr) || (xr <= x && x <= xl)) {
if((yl <= y && y <= yr) || (yr <= y && y <= yl)) {
return 1;
}
}
return 0;
}
static uint32_t ZDUnshuffle(uint64_t w)
{
w &= 0x5555555555555555llu;
w = (w | (w >> 1)) & 0x3333333333333333llu;
w = (w | (w >> 2)) & 0x0F0F0F0F0F0F0F0Fllu;
w = (w | (w >> 4)) & 0x00FF00FF00FF00FFllu;
w = (w | (w >> 8)) & 0x0000FFFF0000FFFFllu;
w = (w | (w >> 16)) & 0x00000000FFFFFFFFllu;
return (uint32_t)w;
}
static void ZDDecodePoint(uint64_t point, int32_t* lat, int32_t* lon)
{
*lat = (int32_t)ZDDecodeUnsignedToSigned(ZDUnshuffle(point));
*lon = (int32_t)ZDDecodeUnsignedToSigned(ZDUnshuffle(point >> 1));
}
struct Reader {
const ZoneDetect *library;
uint32_t polygonIndex;
uint64_t numVertices;
uint8_t done, first;
uint32_t referenceStart, referenceEnd;
int32_t referenceDirection;
int32_t pointLat, pointLon;
int32_t firstLat, firstLon;
};
static void ZDReaderInit(struct Reader *reader, const ZoneDetect *library, uint32_t polygonIndex)
{
memset(reader, 0, sizeof(*reader));
reader->library = library;
reader->polygonIndex = polygonIndex;
reader->first = 1;
}
static int ZDReaderGetPoint(struct Reader *reader, int32_t *pointLat, int32_t *pointLon)
{
int32_t diffLat = 0, diffLon = 0;
readNewPoint:
if(reader->done > 1) {
return 0;
}
if(reader->first && reader->library->version == 0) {
if(!ZDDecodeVariableLengthUnsigned(reader->library, &reader->polygonIndex, &reader->numVertices)) return -1;
if(!reader->numVertices) return -1;
}
uint8_t referenceDone = 0;
if(reader->library->version == 1) {
uint64_t point = 0;
if(!reader->referenceDirection) {
if(!ZDDecodeVariableLengthUnsigned(reader->library, &reader->polygonIndex, &point)) return -1;
} else {
if(reader->referenceDirection > 0) {
/* Read reference forward */
if(!ZDDecodeVariableLengthUnsigned(reader->library, &reader->referenceStart, &point)) return -1;
if(reader->referenceStart >= reader->referenceEnd) {
referenceDone = 1;
}
} else if(reader->referenceDirection < 0) {
/* Read reference backwards */
if(!ZDDecodeVariableLengthUnsignedReverse(reader->library, &reader->referenceStart, &point)) return -1;
if(reader->referenceStart <= reader->referenceEnd) {
referenceDone = 1;
}
}
}
if(!point) {
/* This is a special marker, it is not allowed in reference mode */
if(reader->referenceDirection) {
return -1;
}
uint64_t value;
if(!ZDDecodeVariableLengthUnsigned(reader->library, &reader->polygonIndex, &value)) return -1;
if(value == 0) {
reader->done = 2;
} else if(value == 1) {
int32_t diff;
int64_t start;
if(!ZDDecodeVariableLengthUnsigned(reader->library, &reader->polygonIndex, (uint64_t*)&start)) return -1;
if(!ZDDecodeVariableLengthSigned(reader->library, &reader->polygonIndex, &diff)) return -1;
reader->referenceStart = reader->library->dataOffset+(uint32_t)start;
reader->referenceEnd = reader->library->dataOffset+(uint32_t)(start + diff);
reader->referenceDirection = diff;
if(diff < 0) {
reader->referenceStart--;
reader->referenceEnd--;
}
goto readNewPoint;
}
} else {
ZDDecodePoint(point, &diffLat, &diffLon);
if(reader->referenceDirection < 0) {
diffLat = -diffLat;
diffLon = -diffLon;
}
}
}
if(reader->library->version == 0) {
if(!ZDDecodeVariableLengthSigned(reader->library, &reader->polygonIndex, &diffLat)) return -1;
if(!ZDDecodeVariableLengthSigned(reader->library, &reader->polygonIndex, &diffLon)) return -1;
}
if(!reader->done) {
reader->pointLat += diffLat;
reader->pointLon += diffLon;
if(reader->first) {
reader->firstLat = reader->pointLat;
reader->firstLon = reader->pointLon;
}
} else {
/* Close the polygon (the closing point is not encoded) */
reader->pointLat = reader->firstLat;
reader->pointLon = reader->firstLon;
reader->done = 2;
}
reader->first = 0;
if(reader->library->version == 0) {
reader->numVertices--;
if(!reader->numVertices) {
reader->done = 1;
}
if(!diffLat && !diffLon) {
goto readNewPoint;
}
}
if(referenceDone) {
reader->referenceDirection = 0;
}
if(pointLat) {
*pointLat = reader->pointLat;
}
if(pointLon) {
*pointLon = reader->pointLon;
}
return 1;
}
static int ZDFindPolygon(const ZoneDetect *library, uint32_t wantedId, uint32_t* metadataIndexPtr, uint32_t* polygonIndexPtr)
{
uint32_t polygonId = 0;
uint32_t bboxIndex = library->bboxOffset;
uint32_t metadataIndex = 0, polygonIndex = 0;
while(bboxIndex < library->metadataOffset) {
uint64_t polygonIndexDelta;
int32_t metadataIndexDelta;
int32_t tmp;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &tmp)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &tmp)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &tmp)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &tmp)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &metadataIndexDelta)) break;
if(!ZDDecodeVariableLengthUnsigned(library, &bboxIndex, &polygonIndexDelta)) break;
metadataIndex += (uint32_t)metadataIndexDelta;
polygonIndex += (uint32_t)polygonIndexDelta;
if(polygonId == wantedId) {
if(metadataIndexPtr) {
metadataIndex += library->metadataOffset;
*metadataIndexPtr = metadataIndex;
}
if(polygonIndexPtr) {
polygonIndex += library->dataOffset;
*polygonIndexPtr = polygonIndex;
}
return 1;
}
polygonId ++;
}
return 0;
}
static int32_t* ZDPolygonToListInternal(const ZoneDetect *library, uint32_t polygonIndex, size_t* length)
{
struct Reader reader;
ZDReaderInit(&reader, library, polygonIndex);
size_t listLength = 2 * 100;
size_t listIndex = 0;
int32_t* list = malloc(sizeof(int32_t) * listLength);
if(!list) {
goto fail;
}
while(1) {
int32_t pointLat, pointLon;
int result = ZDReaderGetPoint(&reader, &pointLat, &pointLon);
if(result < 0) {
goto fail;
} else if(result == 0) {
break;
}
if(listIndex >= listLength) {
listLength *= 2;
if(listLength >= 1048576) {
goto fail;
}
list = realloc(list, sizeof(int32_t) * listLength);
if(!list) {
goto fail;
}
}
list[listIndex++] = pointLat;
list[listIndex++] = pointLon;
}
if(length) {
*length = listIndex;
}
return list;
fail:
if(list) {
free(list);
}
return NULL;
}
float* ZDPolygonToList(const ZoneDetect *library, uint32_t polygonId, size_t* lengthPtr)
{
uint32_t polygonIndex;
int32_t* data = NULL;
float* flData = NULL;
if(!ZDFindPolygon(library, polygonId, NULL, &polygonIndex)) {
goto fail;
}
size_t length = 0;
data = ZDPolygonToListInternal(library, polygonIndex, &length);
if(!data) {
goto fail;
}
flData = malloc(sizeof(float) * length);
if(!flData) {
goto fail;
}
size_t i;
for(i = 0; i<length; i+= 2) {
int32_t lat = data[i];
int32_t lon = data[i+1];
flData[i] = ZDFixedPointToFloat(lat, 90, library->precision);
flData[i+1] = ZDFixedPointToFloat(lon, 180, library->precision);
}
if(lengthPtr) {
*lengthPtr = length;
}
return flData;
fail:
if(data) {
free(data);
}
if(flData) {
free(flData);
}
return NULL;
}
static ZDLookupResult ZDPointInPolygon(const ZoneDetect *library, uint32_t polygonIndex, int32_t latFixedPoint, int32_t lonFixedPoint, uint64_t *distanceSqrMin)
{
int32_t pointLat, pointLon, prevLat = 0, prevLon = 0;
int prevQuadrant = 0, winding = 0;
uint8_t first = 1;
struct Reader reader;
ZDReaderInit(&reader, library, polygonIndex);
while(1) {
int result = ZDReaderGetPoint(&reader, &pointLat, &pointLon);
if(result < 0) {
return ZD_LOOKUP_PARSE_ERROR;
} else if(result == 0) {
break;
}
/* Check if point is ON the border */
if(pointLat == latFixedPoint && pointLon == lonFixedPoint) {
if(distanceSqrMin) *distanceSqrMin = 0;
return ZD_LOOKUP_ON_BORDER_VERTEX;
}
/* Find quadrant */
int quadrant;
if(pointLat >= latFixedPoint) {
if(pointLon >= lonFixedPoint) {
quadrant = 0;
} else {
quadrant = 1;
}
} else {
if(pointLon >= lonFixedPoint) {
quadrant = 3;
} else {
quadrant = 2;
}
}
if(!first) {
int windingNeedCompare = 0, lineIsStraight = 0;
float a = 0, b = 0;
/* Calculate winding number */
if(quadrant == prevQuadrant) {
/* Do nothing */
} else if(quadrant == (prevQuadrant + 1) % 4) {
winding ++;
} else if((quadrant + 1) % 4 == prevQuadrant) {
winding --;
} else {
windingNeedCompare = 1;
}
/* Avoid horizontal and vertical lines */
if((pointLon == prevLon || pointLat == prevLat)) {
lineIsStraight = 1;
}
/* Calculate the parameters of y=ax+b if needed */
if(!lineIsStraight && (distanceSqrMin || windingNeedCompare)) {
a = ((float)pointLat - (float)prevLat) / ((float)pointLon - (float)prevLon);
b = (float)pointLat - a * (float)pointLon;
}
int onStraight = ZDPointInBox(pointLat, latFixedPoint, prevLat, pointLon, lonFixedPoint, prevLon);
if(lineIsStraight && (onStraight || windingNeedCompare)) {
if(distanceSqrMin) *distanceSqrMin = 0;
return ZD_LOOKUP_ON_BORDER_SEGMENT;
}
/* Jumped two quadrants. */
if(windingNeedCompare) {
/* Check if the target is on the border */
const int32_t intersectLon = (int32_t)(((float)latFixedPoint - b) / a);
if(intersectLon >= lonFixedPoint-1 && intersectLon <= lonFixedPoint+1) {
if(distanceSqrMin) *distanceSqrMin = 0;
return ZD_LOOKUP_ON_BORDER_SEGMENT;
}
/* Ok, it's not. In which direction did we go round the target? */
const int sign = (intersectLon < lonFixedPoint) ? 2 : -2;
if(quadrant == 2 || quadrant == 3) {
winding += sign;
} else {
winding -= sign;
}
}
/* Calculate closest point on line (if needed) */
if(distanceSqrMin) {
float closestLon, closestLat;
if(!lineIsStraight) {
closestLon = ((float)lonFixedPoint + a * (float)latFixedPoint - a * b) / (a * a + 1);
closestLat = (a * ((float)lonFixedPoint + a * (float)latFixedPoint) + b) / (a * a + 1);
} else {
if(pointLon == prevLon) {
closestLon = (float)pointLon;
closestLat = (float)latFixedPoint;
} else {
closestLon = (float)lonFixedPoint;
closestLat = (float)pointLat;
}
}
const int closestInBox = ZDPointInBox(pointLon, (int32_t)closestLon, prevLon, pointLat, (int32_t)closestLat, prevLat);
int64_t diffLat, diffLon;
if(closestInBox) {
/* Calculate squared distance to segment. */
diffLat = (int64_t)(closestLat - (float)latFixedPoint);
diffLon = (int64_t)(closestLon - (float)lonFixedPoint);
} else {
/*
* Calculate squared distance to vertices
* It is enough to check the current point since the polygon is closed.
*/
diffLat = (int64_t)(pointLat - latFixedPoint);
diffLon = (int64_t)(pointLon - lonFixedPoint);
}
/* Note: lon has half scale */
uint64_t distanceSqr = (uint64_t)(diffLat * diffLat) + (uint64_t)(diffLon * diffLon) * 4;
if(distanceSqr < *distanceSqrMin) *distanceSqrMin = distanceSqr;
}
}
prevQuadrant = quadrant;
prevLat = pointLat;
prevLon = pointLon;
first = 0;
};
if(winding == -4) {
return ZD_LOOKUP_IN_ZONE;
} else if(winding == 4) {
return ZD_LOOKUP_IN_EXCLUDED_ZONE;
} else if(winding == 0) {
return ZD_LOOKUP_NOT_IN_ZONE;
}
/* Should not happen */
if(distanceSqrMin) *distanceSqrMin = 0;
return ZD_LOOKUP_ON_BORDER_SEGMENT;
}
void ZDCloseDatabase(ZoneDetect *library)
{
if(library) {
if(library->fieldNames) {
size_t i;
for(i = 0; i < (size_t)library->numFields; i++) {
if(library->fieldNames[i]) {
free(library->fieldNames[i]);
}
}
free(library->fieldNames);
}
if(library->notice) {
free(library->notice);
}
if(library->closeType == 0) {
#if defined(_MSC_VER) || defined(__MINGW32__)
if(library->mapping && !UnmapViewOfFile(library->mapping)) zdError(ZD_E_DB_MUNMAP_MSVIEW, (int)GetLastError());
if(library->fdMap && !CloseHandle(library->fdMap)) zdError(ZD_E_DB_MUNMAP, (int)GetLastError());
if(library->fd && !CloseHandle(library->fd)) zdError(ZD_E_DB_CLOSE, (int)GetLastError());
#elif defined(__APPLE__) || defined(__linux__) || defined(__unix__) || defined(_POSIX_VERSION)
if(library->mapping && munmap(library->mapping, (size_t)(library->length))) zdError(ZD_E_DB_MUNMAP, 0);
if(library->fd >= 0 && close(library->fd)) zdError(ZD_E_DB_CLOSE, 0);
#endif
}
free(library);
}
}
ZoneDetect *ZDOpenDatabaseFromMemory(void* buffer, size_t length)
{
ZoneDetect *const library = malloc(sizeof *library);
if(library) {
memset(library, 0, sizeof(*library));
library->closeType = 1;
library->length = (long int)length;
if(library->length <= 0) {
#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__APPLE__) || defined(__linux__) || defined(__unix__) || defined(_POSIX_VERSION)
zdError(ZD_E_DB_SEEK, errno);
#else
zdError(ZD_E_DB_SEEK, 0);
#endif
goto fail;
}
library->mapping = buffer;
/* Parse the header */
if(ZDParseHeader(library)) {
zdError(ZD_E_PARSE_HEADER, 0);
goto fail;
}
}
return library;
fail:
ZDCloseDatabase(library);
return NULL;
}
ZoneDetect *ZDOpenDatabase(const char *path)
{
ZoneDetect *const library = malloc(sizeof *library);
if(library) {
memset(library, 0, sizeof(*library));
#if defined(_MSC_VER) || defined(__MINGW32__)
library->fd = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (library->fd == INVALID_HANDLE_VALUE) {
zdError(ZD_E_DB_OPEN, (int)GetLastError());
goto fail;
}
const DWORD fsize = GetFileSize(library->fd, NULL);
if (fsize == INVALID_FILE_SIZE) {
zdError(ZD_E_DB_SEEK, (int)GetLastError());
goto fail;
}
library->length = (int32_t)fsize;
library->fdMap = CreateFileMappingA(library->fd, NULL, PAGE_READONLY, 0, 0, NULL);
if (!library->fdMap) {
zdError(ZD_E_DB_MMAP, (int)GetLastError());
goto fail;
}
library->mapping = MapViewOfFile(library->fdMap, FILE_MAP_READ, 0, 0, 0);
if (!library->mapping) {
zdError(ZD_E_DB_MMAP_MSVIEW, (int)GetLastError());
goto fail;
}
#elif defined(__APPLE__) || defined(__linux__) || defined(__unix__) || defined(_POSIX_VERSION)
library->fd = open(path, O_RDONLY | O_CLOEXEC);
if(library->fd < 0) {
zdError(ZD_E_DB_OPEN, errno);
goto fail;
}
library->length = lseek(library->fd, 0, SEEK_END);
if(library->length <= 0 || library->length > 50331648) {
zdError(ZD_E_DB_SEEK, errno);
goto fail;
}
lseek(library->fd, 0, SEEK_SET);
library->mapping = mmap(NULL, (size_t)library->length, PROT_READ, MAP_PRIVATE | MAP_FILE, library->fd, 0);
if(library->mapping == MAP_FAILED) {
zdError(ZD_E_DB_MMAP, errno);
goto fail;
}
#endif
/* Parse the header */
if(ZDParseHeader(library)) {
zdError(ZD_E_PARSE_HEADER, 0);
goto fail;
}
}
return library;
fail:
ZDCloseDatabase(library);
return NULL;
}
ZoneDetectResult *ZDLookup(const ZoneDetect *library, float lat, float lon, float *safezone)
{
const int32_t latFixedPoint = ZDFloatToFixedPoint(lat, 90, library->precision);
const int32_t lonFixedPoint = ZDFloatToFixedPoint(lon, 180, library->precision);
size_t numResults = 0;
uint64_t distanceSqrMin = (uint64_t)-1;
/* Iterate over all polygons */
uint32_t bboxIndex = library->bboxOffset;
uint32_t metadataIndex = 0;
uint32_t polygonIndex = 0;
ZoneDetectResult *results = malloc(sizeof *results);
if(!results) {
return NULL;
}
uint32_t polygonId = 0;
while(bboxIndex < library->metadataOffset) {
int32_t minLat, minLon, maxLat, maxLon, metadataIndexDelta;
uint64_t polygonIndexDelta;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &minLat)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &minLon)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &maxLat)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &maxLon)) break;
if(!ZDDecodeVariableLengthSigned(library, &bboxIndex, &metadataIndexDelta)) break;
if(!ZDDecodeVariableLengthUnsigned(library, &bboxIndex, &polygonIndexDelta)) break;
metadataIndex += (uint32_t)metadataIndexDelta;
polygonIndex += (uint32_t)polygonIndexDelta;
if(latFixedPoint >= minLat) {
if(latFixedPoint <= maxLat &&
lonFixedPoint >= minLon &&
lonFixedPoint <= maxLon) {
const ZDLookupResult lookupResult = ZDPointInPolygon(library, library->dataOffset + polygonIndex, latFixedPoint, lonFixedPoint, (safezone) ? &distanceSqrMin : NULL);
if(lookupResult == ZD_LOOKUP_PARSE_ERROR) {
break;
} else if(lookupResult != ZD_LOOKUP_NOT_IN_ZONE) {
ZoneDetectResult *const newResults = realloc(results, sizeof *newResults * (numResults + 2));
if(newResults) {
results = newResults;
results[numResults].polygonId = polygonId;
results[numResults].metaId = metadataIndex;
results[numResults].numFields = library->numFields;
results[numResults].fieldNames = library->fieldNames;
results[numResults].lookupResult = lookupResult;
numResults++;
} else {
break;
}
}
}
} else {
/* The data is sorted along minLat */
break;
}
polygonId++;
}
/* Clean up results */
size_t i;
for(i = 0; i < numResults; i++) {
int insideSum = 0;
ZDLookupResult overrideResult = ZD_LOOKUP_IGNORE;
size_t j;
for(j = i; j < numResults; j++) {
if(results[i].metaId == results[j].metaId) {
ZDLookupResult tmpResult = results[j].lookupResult;
results[j].lookupResult = ZD_LOOKUP_IGNORE;
/* This is the same result. Is it an exclusion zone? */
if(tmpResult == ZD_LOOKUP_IN_ZONE) {
insideSum++;
} else if(tmpResult == ZD_LOOKUP_IN_EXCLUDED_ZONE) {
insideSum--;
} else {
/* If on the bodrder then the final result is on the border */
overrideResult = tmpResult;