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BackgroundResource,
CompressedBackgroundResource,
CompressedProjectResources,
CompressedSceneResourceWithChildren,
ProjectResources,
SceneResource,
} from "shared/lib/resources/types";
export const compress8bitNumberArray = (arr: number[] | undefined): string => {
if (!arr) {
return "";
}
let lastValue = -1;
let output = "";
let count = 0;
for (let i = 0; i < arr.length; i++) {
if (arr[i] !== lastValue) {
if (count === 1) {
output += "!";
} else if (count > 0) {
output += `${count.toString(16)}+`;
}
count = 0;
lastValue = arr[i];
output += (lastValue % 256).toString(16).padStart(2, "0");
}
count++;
}
if (count === 1) {
output += "!";
} else if (count > 0) {
output += `${count.toString(16)}+`;
}
return output;
};
export const decompress8bitNumberString = (str: string): number[] => {
const arr: number[] = [];
let i = 0;
while (i < str.length) {
// Read the value
const value = parseInt(str.slice(i, i + 2), 16);
i += 2;
let count = 1;
if (i < str.length) {
if (str[i] === "!") {
// Single occurrence
count = 1;
i++;
} else {
// Read the count
const countStart = i;
const countEnd = str.indexOf("+", countStart);
if (countStart === countEnd || countEnd === -1) {
// No count or no end of count marker found - string was invalid
return [];
}
count = parseInt(str.slice(countStart, countEnd), 16);
i = countEnd + 1;
}
} else {
// value was missing count / markers - string was invalid
return [];
}
// Add the value `count` times to the array
for (let j = 0; j < count; j++) {
arr.push(value);
}
}
return arr;
};
const decompressSceneResource = (
scene: CompressedSceneResourceWithChildren,
): SceneResource => {
return {
...scene,
collisions: decompress8bitNumberString(scene.collisions),
};
};
const decompressBackgroundResource = (
background: CompressedBackgroundResource,
): BackgroundResource => {
return {
...background,
tileColors: decompress8bitNumberString(background.tileColors),
};
};
export const decompressProjectResources = (
compressedResources: CompressedProjectResources,
): ProjectResources => {
return {
...compressedResources,
scenes: compressedResources.scenes.map(decompressSceneResource),
backgrounds: compressedResources.backgrounds.map(
decompressBackgroundResource,
),
};
};
export const compressSceneResource = (
scene: SceneResource,
): CompressedSceneResourceWithChildren => {
return {
...scene,
collisions: compress8bitNumberArray(scene.collisions),
};
};
export const compressBackgroundResource = (
background: BackgroundResource,
): CompressedBackgroundResource => {
return {
...background,
tileColors: compress8bitNumberArray(background.tileColors),
};
};
export const compressProjectResources = (
resources: ProjectResources,
): CompressedProjectResources => {
return {
...resources,
scenes: resources.scenes.map(compressSceneResource),
backgrounds: resources.backgrounds.map(compressBackgroundResource),
};
};
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