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LibGfx/PortableFormat: Use finite loops in read_image_data

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The `read_image_data` function of each one of[PBM, PGM, PPM]Loader use
the same structure to read an image. This patch harmonizes the three
functions and use finite loops instead of reading until EOF. It allows
to quit early on bloated file, but it's mainly done for refactoring
purpose.
This commit is contained in:
Lucas CHOLLET
2023-03-16 20:17:14 -04:00
committed by Andreas Kling
parent 24087ef6eb
commit b9574c180e
Notes: sideshowbarker 2024-07-19 01:59:31 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/b9574c180e
Pull-request: https://github.com/SerenityOS/serenity/pull/17831
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
Reviewed-by: https://github.com/nico
3 changed files with 48 additions and 49 deletions
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25
Userland/Libraries/LibGfx/ImageFormats/PGMLoader.cpp
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@@ -31,32 +31,31 @@ static void set_adjusted_pixels(PGMLoadingContext& context, Vector<Gfx::Color> c
bool read_image_data(PGMLoadingContext& context, Streamer& streamer)
{
Vector<Gfx::Color> color_data;
auto const context_size = context.width * context.height;
color_data.resize(context_size);
if (context.type == PGMLoadingContext::Type::ASCII) {
while (true) {
for (u64 i = 0; i < context_size; ++i) {
auto number_or_error = read_number(streamer);
if (number_or_error.is_error())
break;
return false;
auto value = number_or_error.value();
if (read_whitespace(context, streamer).is_error())
break;
return false;
color_data.append({ (u8)value, (u8)value, (u8)value });
color_data[i] = { (u8)value, (u8)value, (u8)value };
}
} else if (context.type == PGMLoadingContext::Type::RAWBITS) {
u8 pixel;
while (streamer.read(pixel)) {
color_data.append({ pixel, pixel, pixel });
for (u64 i = 0; i < context_size; ++i) {
u8 pixel;
if (!streamer.read(pixel))
return false;
color_data[i] = { pixel, pixel, pixel };
}
}
size_t context_size = (u32)context.width * (u32)context.height;
if (context_size != color_data.size()) {
dbgln("Not enough color data in image.");
return false;
}
if (!create_bitmap(context))
return false;