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#include <cstdio>
#include "exception.h"
#include "file_environment.h"
namespace Shader {
FileEnvironment::FileEnvironment(const char* path) {
std::FILE* const file{std::fopen(path, "rb")};
if (!file) {
throw RuntimeError("Failed to open file='{}'", path);
}
std::fseek(file, 0, SEEK_END);
const long size{std::ftell(file)};
std::rewind(file);
if (size % 8 != 0) {
std::fclose(file);
throw RuntimeError("File size={} is not aligned to 8", size);
}
// TODO: Use a unique_ptr to avoid zero-initializing this
const size_t num_inst{static_cast<size_t>(size) / 8};
data.resize(num_inst);
if (std::fread(data.data(), 8, num_inst, file) != num_inst) {
std::fclose(file);
throw RuntimeError("Failed to read instructions={} from file='{}'", num_inst, path);
}
std::fclose(file);
}
FileEnvironment::~FileEnvironment() = default;
u64 FileEnvironment::ReadInstruction(u32 offset) const {
if (offset % 8 != 0) {
throw InvalidArgument("offset={} is not aligned to 8", offset);
}
if (offset / 8 >= static_cast<u32>(data.size())) {
throw InvalidArgument("offset={} is out of bounds", offset);
}
return data[offset / 8];
}
} // namespace Shader
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