banan-os/userspace/libraries/LibFont/Font.cpp

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#include <BAN/ScopeGuard.h>
#include <LibFont/Font.h>
#include <LibFont/PSF.h>
#if __is_kernel
#include <kernel/FS/VirtualFileSystem.h>
#endif
#include <fcntl.h>
#if __is_kernel
extern uint8_t _binary_font_prefs_psf_start[];
extern uint8_t _binary_font_prefs_psf_end[];
#endif
namespace LibFont
{
#if __is_kernel
BAN::ErrorOr<Font> Font::prefs()
{
size_t font_data_size = _binary_font_prefs_psf_end - _binary_font_prefs_psf_start;
return load(BAN::ConstByteSpan(_binary_font_prefs_psf_start, font_data_size));
}
#endif
BAN::ErrorOr<Font> Font::load(BAN::StringView path)
{
BAN::Vector<uint8_t> file_data;
#if __is_kernel
{
auto inode = TRY(Kernel::VirtualFileSystem::get().file_from_absolute_path({ 0, 0, 0, 0 }, path, O_RDONLY)).inode;
TRY(file_data.resize(inode->size()));
TRY(inode->read(0, BAN::ByteSpan(file_data.span())));
}
#else
{
char path_buffer[PATH_MAX];
strncpy(path_buffer, path.data(), path.size());
path_buffer[path.size()] = '\0';
int fd = open(path_buffer, O_RDONLY);
if (fd == -1)
return BAN::Error::from_errno(errno);
BAN::ScopeGuard file_closer([fd] { close(fd); });
struct stat st;
if (fstat(fd, &st) == -1)
return BAN::Error::from_errno(errno);
TRY(file_data.resize(st.st_size));
ssize_t total_read = 0;
while (total_read < st.st_size)
{
ssize_t nread = read(fd, file_data.data() + total_read, st.st_size - total_read);
if (nread == -1)
return BAN::Error::from_errno(errno);
total_read += nread;
}
}
#endif
return load(BAN::ConstByteSpan(file_data.span()));
}
BAN::ErrorOr<Font> Font::load(BAN::ConstByteSpan font_data)
{
if (is_psf1(font_data))
return TRY(parse_psf1(font_data));
if (is_psf2(font_data))
return TRY(parse_psf2(font_data));
return BAN::Error::from_errno(ENOTSUP);
}
}