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Add bounds checking before accessing slice elements to prevent panic when HOCR output is empty or malformed. This provides clearer error messages instead of a runtime panic.
ioutil package was deprecated in Go 1.16. Use os.ReadFile instead which provides the same functionality.
Add separate installation sections for macOS, Linux (Debian/Ubuntu), and Windows. The Windows section documents the vcpkg + MinGW setup required for CGO compatibility.
The mwaeckerlin/mingw base image has an old Go version that doesn't support os.ReadFile (introduced in Go 1.16). Since the module requires Go 1.21, manually download and install Go 1.21.13 instead of using the apt package.
Update debian.Dockerfile and debian_tess4.1.1.Dockerfile to manually install Go 1.21.13 instead of using the apt package, which provides an older version that doesn't support os.ReadFile.
The golang apt package included gcc as a dependency. Since we now install Go manually, we need to explicitly install gcc and g++ for CGO to work.
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