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Empty gdal
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doinachiroiu
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cmake_minimum_required(VERSION 3.10)
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project(test CXX C)
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED True)
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set(SAPI_ROOT "/usr/local/google/home/inach/work/sandboxed-api" CACHE PATH "Path to the Sandboxed API source tree")
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# cmake .. -G Ninja -DSAPI_ROOT=$HOME/sapi_root
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set(SAPI_ENABLE_EXAMPLES OFF CACHE BOOL "")
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set(SAPI_ENABLE_TESTS OFF CACHE BOOL "")
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add_subdirectory("${SAPI_ROOT}"
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"${CMAKE_BINARY_DIR}/sandboxed-api-build"
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# Omit this to have the full Sandboxed API in IDE
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EXCLUDE_FROM_ALL)
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add_library(libgdal STATIC IMPORTED)
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set_property(TARGET libgdal PROPERTY IMPORTED_LOCATION "${CMAKE_CURRENT_SOURCE_DIR}/lib/libgdal.a")
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find_package(PNG REQUIRED)
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target_link_libraries(libgdal INTERFACE
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crypto expat jpeg
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/usr/lib/x86_64-linux-gnu/libproj.so
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/usr/lib/x86_64-linux-gnu/libpcre.so
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sqlite3 tiff z pthread m rt dl curl
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PNG::PNG)
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add_sapi_library(gdal_sapi
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FUNCTIONS GDALOpen GDALAllRegister GDALGetDatasetDriver
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GDALGetDriverShortName GDALGetDriverLongName GDALGetRasterXSize
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GDALGetRasterYSize GDALGetRasterCount GDALGetProjectionRef
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GDALOpenEx GDALGetGeoTransform GDALGetRasterBand GDALGetBlockSize
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GDALGetRasterMinimum GDALGetRasterMaximum GDALGetRasterBandXSize
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GDALGetRasterBandYSize GDALRasterIO
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INPUTS "/usr/include/gdal/gdal.h"
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LIBRARY libgdal
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LIBRARY_NAME gdal
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NAMESPACE ""
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)
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target_include_directories(gdal_sapi INTERFACE
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"${PROJECT_BINARY_DIR}"
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)
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add_executable(raster
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raster.cc
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)
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target_link_libraries(raster
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gdal_sapi
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sapi::sapi
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)
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# GDAL Raster GeoTIFF Workflow
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```
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Build Tools: CMake/Ninja
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OS: Linux
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```
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### For testing:
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`mkdir build && cd build`
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`cmake .. -G Ninja`
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`ninja`
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`./raster`
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## About the project
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GDAL is a translator library for raster and vector
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geospatial data format.
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The project consist in rastering a GeoTIFF file format
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using GDAL functionalities and sandboxed methods.
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## Implementation
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*Sandboxing...*
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The purpose of sandboxing is to limit the permissions
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and capabilities of library’s methods, in order to
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secure the usage of them. After obtaining the sandbox,
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the functions will be called through an Sandbox API
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(being called api in the current test) and so, the
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operations, system calls or namspaces access may be
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controlled.
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*Raster process...*
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From gdal.h header useful methods are added to sapi
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library builded with CMake.
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One .tiff file is manipulated with GDALOpen
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functionality, which extracts a pointer to the data set
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containg a list of raster bands, all pertaining to the
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same area.
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Metadata, a coordinate system, a georeferencing
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transform, size of raster and various other information
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are kept into the data set that corresponds to the image.
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To create an array containing the image information, the
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dimentions needed are extracted using some specific
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GDAL(X/Y)Size functions applied to the block.
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GDALRasterBand function takes care of data type conversion, one more step following: placing the
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converted data (with RasterIO method) into the created
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and well allocated structure.
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#include <gflags/gflags.h>
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#include <glog/logging.h>
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#include <iostream>
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#include "gdal_sapi.sapi.h"
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#include "sandboxed_api/sandbox2/util/fileops.h"
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class GdalSapiSandbox : public gdalSandbox {
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public:
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std::unique_ptr<sandbox2::Policy> ModifyPolicy(
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sandbox2::PolicyBuilder*) override {
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return sandbox2::PolicyBuilder()
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.DangerDefaultAllowAll()
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.DisableNamespaces()
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.BuildOrDie();
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}
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};
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int main() {
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GdalSapiSandbox sandbox;
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sandbox.Init().IgnoreError();
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gdalApi api(&sandbox);
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// Reading GDALDataset from a (local, specific) file.
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std::string filename = "CANYrelief1-geo.tif";
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sapi::v::CStr s(filename.data());
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api.GDALAllRegister().IgnoreError();
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auto open = api.GDALOpen(s.PtrBefore(), GDALAccess::GA_ReadOnly);
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sapi::v::RemotePtr ptrDataset(open.value());
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LOG(INFO) << "Dataset pointer adress: " << open.value() << std::endl;
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LOG(INFO) << ptrDataset.ToString() << std::endl;
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if (!open.value()) {
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printf("NULL pointer for Dataset.\n");
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return 1;
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}
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// Printing some general information about the dataset.
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auto driver = api.GDALGetDatasetDriver(&ptrDataset);
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sapi::v::RemotePtr ptrDriver(driver.value());
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auto driverShortName = api.GDALGetDriverShortName(&ptrDriver);
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auto driverLongName = api.GDALGetDriverLongName(&ptrDriver);
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sapi::v::RemotePtr ptrDriverShortName(driverShortName.value());
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sapi::v::RemotePtr ptrDriverLongName(driverLongName.value());
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LOG(INFO) << "Driver short name: "
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<< sandbox.GetCString(ptrDriverShortName).value().c_str();
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LOG(INFO) << "Driver long name: "
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<< sandbox.GetCString(ptrDriverLongName).value().c_str();
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// Checking that GetGeoTransform is valid.
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std::vector<double> adfGeoTransform(6);
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sapi::v::Array<double> adfGeoTransformArray(&adfGeoTransform[0],
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adfGeoTransform.size());
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api.GDALGetGeoTransform(&ptrDataset, adfGeoTransformArray.PtrBoth())
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.IgnoreError();
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LOG(INFO) << "Origin = (" << adfGeoTransform[0] << ", " << adfGeoTransform[3]
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<< ")" << std::endl;
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LOG(INFO) << "Pixel Size = (" << adfGeoTransform[0] << ", "
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<< adfGeoTransform[3] << ")" << std::endl;
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std::vector<int> nBlockXSize(1);
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std::vector<int> nBlockYSize(1);
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sapi::v::Array<int> nBlockXSizeArray(&nBlockXSize[0], nBlockXSize.size());
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sapi::v::Array<int> nBlockYSizeArray(&nBlockYSize[0], nBlockYSize.size());
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auto band = api.GDALGetRasterBand(&ptrDataset, 1);
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LOG(INFO) << "Band pointer adress: " << band.value() << std::endl;
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if (!band.value()) {
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printf("NULL pointer for Band.\n");
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return 1;
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}
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sapi::v::RemotePtr ptrBand(band.value());
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api.GDALGetBlockSize(&ptrBand, nBlockXSizeArray.PtrBoth(),
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nBlockYSizeArray.PtrBoth())
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.IgnoreError();
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LOG(INFO) << "Block = " << nBlockXSize[0] << " x " << nBlockYSize[0]
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<< std::endl;
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std::vector<int> bGotMin(1);
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std::vector<int> bGotMax(1);
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sapi::v::Array<int> bGotMinArray(&bGotMin[0], bGotMin.size());
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sapi::v::Array<int> bGotMaxArray(&bGotMax[0], bGotMax.size());
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auto adfMin = api.GDALGetRasterMinimum(&ptrBand, bGotMinArray.PtrBoth());
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auto adfMax = api.GDALGetRasterMaximum(&ptrBand, bGotMaxArray.PtrBoth());
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auto nXSize = api.GDALGetRasterBandXSize(&ptrBand);
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auto nYSize = api.GDALGetRasterBandYSize(&ptrBand);
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std::vector<int8_t> rasterData(nXSize.value() * nYSize.value(), -1);
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sapi::v::Array<int8_t> rasterDataArray(&rasterData[0], rasterData.size());
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api.GDALRasterIO(&ptrBand, GF_Read, 0, 0, nXSize.value(), nYSize.value(),
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rasterDataArray.PtrBoth(), nXSize.value(), nYSize.value(),
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GDT_Byte, 0, 0)
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.IgnoreError();
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std::cout << "Raster data info: " << rasterDataArray.ToString() << std::endl;
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// To print the data content: `std::cout << rasterDataArray.GetData() <<
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// std::endl;`
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return 0;
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}
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