FEX-Emu--FEX/External/FEXCore/Source/Utils/FileLoading.cpp

#include <FEXCore/fextl/vector.h>

#include <string>
#include <vector>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <span>
#include <unistd.h>

namespace FEXCore::FileLoading {
// TODO: Delete once all uses of std::vector LoadFile is removed.
bool LoadFile(std::vector<char> &Data, const std::string &Filepath, size_t FixedSize) {
  int FD = open(Filepath.c_str(), O_RDONLY);

  if (FD == -1) {
    return false;
  }

  size_t FileSize{};
  if (FixedSize == 0) {
    struct stat buf;
    if (fstat(FD, &buf) != 0) {
      close(FD);
      return false;
    }

    FileSize = buf.st_size;
  }
  else {
    FileSize = FixedSize;
  }

  ssize_t Read = -1;
  if (FileSize > 0) {
    Data.resize(FileSize);
    Read = pread(FD, &Data.at(0), FileSize, 0);
  }
  close(FD);
  return Read == FileSize;
}

bool LoadFile(fextl::vector<char> &Data, const std::string &Filepath, size_t FixedSize) {
  int FD = open(Filepath.c_str(), O_RDONLY);

  if (FD == -1) {
    return false;
  }

  size_t FileSize{};
  if (FixedSize == 0) {
    struct stat buf;
    if (fstat(FD, &buf) != 0) {
      close(FD);
      return false;
    }

    FileSize = buf.st_size;
  }
  else {
    FileSize = FixedSize;
  }

  ssize_t Read = -1;
  if (FileSize > 0) {
    Data.resize(FileSize);
    Read = pread(FD, &Data.at(0), FileSize, 0);
  }
  close(FD);
  return Read == FileSize;
}

ssize_t LoadFileToBuffer(const std::string &Filepath, std::span<char> Buffer) {
  int FD = open(Filepath.c_str(), O_RDONLY);

  if (FD == -1) {
    return -1;
  }

  ssize_t Read = pread(FD, Buffer.data(), Buffer.size(), 0);
  close(FD);
  return Read;
}

}