Copy file function updates from Parchment:

parse_base64 chunks its input when longer than 30MB, fixes curiousdannii/parchment#157
Improve caching of IF Archive files (curiousdannii/parchment#149)

Author: curiousdannii

src/common/file.ts

@@ -12,9 +12,24 @@ https://github.com/curiousdannii/asyncglk
 export type ProgressCallback = (bytes: number) => void
 
 /** Parse Base 64 into a Uint8Array */
-export async function parse_base64(data: string, data_type = 'octet-binary'): Promise<Uint8Array> {
+export async function parse_base64(data: string): Promise<Uint8Array> {
+    // Firefox has a data URL limit of 32MB, so we have to chunk large data
+    const chunk_length = 30_000_000
+    if (data.length < chunk_length) {
+        return parse_base64_with_data_url(data)
+    }
+    const chunks: Uint8Array[] = []
+    let i = 0
+    while (i < data.length) {
+        chunks.push(await parse_base64_with_data_url(data.substring(i, i += chunk_length)))
+    }
+    const blob = new Blob(chunks)
+    return new Uint8Array(await blob.arrayBuffer())
+}
+
+async function parse_base64_with_data_url(data: string) {
     // Parse base64 using a trick from https://stackoverflow.com/a/54123275/2854284
-    const response = await fetch(`data:application/${data_type};base64,${data}`)
+    const response = await fetch(`data:application/octet-stream;base64,${data}`)
     if (!response.ok) {
         throw new Error(`Could not parse base64: ${response.status}`)
     }

src/dialog/browser/download.ts

@@ -79,6 +79,7 @@ export async function fetch_storyfile(options: DownloadOptions, url: string, pro
     // Handle a relative URL
     const story_url = new URL(url, document.URL)
     const story_domain = story_url.hostname
+    const same_protocol = story_url.protocol === document.location.protocol
     const same_domain = story_domain === document.location.hostname
     const proxy_url = `${options.proxy_url}?url=${story_url}`
     let response: Response
@@ -90,10 +91,12 @@ export async function fetch_storyfile(options: DownloadOptions, url: string, pro
     }
 
     // Only directly access files same origin files or those from the list of reliable domains
-    let direct_access = same_domain || story_url.protocol === 'data:'
+    let direct_access = (same_protocol && same_domain) || story_url.protocol === 'data:'
     if (!direct_access) {
         for (const domain of options.direct_domains) {
             if (story_domain.endsWith(domain)) {
+                // all direct domains require HTTPS
+                story_url.protocol = 'https:'
                 direct_access = true
                 break
             }