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PNGLoader: Use MappedFile.

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This commit is contained in:
Andreas Kling 2019-04-03 14:15:35 +02:00
parent 3dc3754cde
commit c0009e3173
3 changed files with 21 additions and 46 deletions
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39
SharedGraphics/PNGLoader.cpp
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@ -1,5 +1,6 @@
#include <SharedGraphics/PNGLoader.h>
#include <AK/NetworkOrdered.h>
#include <AK/MappedFile.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
@ -101,42 +102,10 @@ static bool process_chunk(Streamer&, PNGLoadingContext& context);
RetainPtr<GraphicsBitmap> load_png(const String& path)
{
int fd = open(path.characters(), O_RDONLY);
if (fd < 0) {
perror("open");
MappedFile mapped_file(path);
if (!mapped_file.is_valid())
return nullptr;
}
struct stat st;
if (fstat(fd, &st) < 0) {
perror("fstat");
if (close(fd) < 0)
perror("close");
return nullptr;
}
if (st.st_size < 8) {
if (close(fd) < 0)
perror("close");
return nullptr;
}
auto* mapped_file = (byte*)mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (mapped_file == MAP_FAILED) {
if (close(fd) < 0)
perror("close");
return nullptr;
}
auto bitmap = load_png_impl(mapped_file, st.st_size);
if (munmap(mapped_file, st.st_size) < 0)
perror("munmap");
if (close(fd) < 0)
perror("close");
return bitmap;
return load_png_impl((const byte*)mapped_file.pointer(), mapped_file.size());
}
[[gnu::always_inline]] static inline byte paeth_predictor(int a, int b, int c)