README.md

@@ -722,8 +722,9 @@ Four async methods may download:
   UTC. Only a JPEG's EXIF is read: any other original gives `{}`, and a video
   gives `{}` without being downloaded.
 
-They serve from the on-disk content cache, or the backup, when the bytes are
-present and otherwise fetch through the pools; `opts.onProgress` reports
+They serve from the on-disk content cache when the bytes are present and
+otherwise fetch through the pools; `original()`, `content()` and `exif()` also
+serve an original the backup has already stored. `opts.onProgress` reports
 per-file progress. They throw when the library was opened without a content
 source. An original that `content()` or `exif()` downloads lands in the cache,
 which does not make `isLocal` true; only `lib.backup()` does.
@@ -741,8 +742,7 @@ The GUI-facing records hold no key material and no binary, so they survive
 - `PhotoRecord`: `fileID`, `albumIDs`, `title`, `takenAt` and `modifiedAt`
   (milliseconds), `fileType`, optional `caption` / `width` / `height` /
   `latitude` / `longitude`, optional `hash` (the content hash recorded at
-  upload; very old files have none) and `fileSize` (the original's size in
-  bytes, as the server reports it), `isArchived`, `isHidden`, and
+  upload; very old files have none), `isArchived`, `isHidden`, and
   `thumbnailPath` / `originalPath` once the bytes are cached (for a live photo,
   `originalPath` is its image).
 - `AlbumRecord`: `collectionID`, `name`, `type`, `isShared`, `updationTime`, and

TODO.md

@@ -26,13 +26,13 @@ declares one.
 # Completed Steps
 
 - 2026-10-01: A `Photo` has `savePath`, `isLocal`, `content()`, `exif()`,
-  `modifiedAt`, `hash`, `fileSize` and `year` (issue 141). `savePath` is where
+  `modifiedAt`, `hash` and `year` (issue 141). `savePath` is where
   `lib.backup()` writes the original under the library's download directory, and
   `isLocal` says whether the whole original is there; both look only at the
   disk. `content()` returns the original's bytes and `exif()` the common EXIF
   fields of a JPEG; both may download the original, and `exif()` downloads no
-  video. `PhotoRecord` gains `modifiedAt`, `hash` and `fileSize`, and the JPEG
-  EXIF scan moved to `src/exif.ts`.
+  video. `PhotoRecord` gains `modifiedAt` and `hash`, and the JPEG EXIF scan
+  moved to `src/exif.ts`.
 
 - 2026-09-29: The "Workflow" list at the top of this file now says to branch
   from `next` and open a pull request that targets `next`, that the repository

src/library/read.ts

@@ -82,9 +82,6 @@ export class Photo {
     get hash(): string | undefined {
         return this.rec.hash;
     }
-    get fileSize(): number | undefined {
-        return this.rec.fileSize;
-    }
     get isArchived(): boolean {
         return this.rec.isArchived;
     }
@@ -132,8 +129,10 @@ export class Photo {
 
     // The common EXIF fields of the original, read from `content()`, so this
     // may download it. Only a JPEG's EXIF is read; any other file gives `{}`,
-    // and a video gives it without fetching anything.
+    // and a video gives it without fetching anything. Like the other content
+    // methods, it throws when there is no content cache, video or not.
     async exif(opts?: ContentOptions): Promise<PhotoExif> {
+        this.cacheOrThrow();
         if (this.rec.fileType === "video") return {};
         return readPhotoExif(await this.content(opts));
     }

src/library/records.ts

@@ -45,8 +45,6 @@ export interface PhotoRecord {
     // The content hash the uploader recorded (`FileMetadata.hash`); files from
     // very old clients have none.
     hash?: string;
-    // The original's size in bytes, as the server reports it.
-    fileSize?: number;
     isArchived: boolean;
     isHidden: boolean;
     // Local cache paths, set once a later phase caches the bytes; unset here.
@@ -150,7 +148,6 @@ const toPhotoRecord = (
     if (rep.metadata.longitude !== undefined)
         record.longitude = rep.metadata.longitude;
     if (rep.metadata.hash !== undefined) record.hash = rep.metadata.hash;
-    if (rep.file.size !== undefined) record.fileSize = rep.file.size;
 
     return record;
 };

test/library/content-library.test.ts

@@ -296,6 +296,16 @@ const JPEG_WITH_EXIF = new Uint8Array([
     ...[0xff, 0xda, 0x00, 0x02], // start of scan
 ]);
 
+// A JPEG whose EXIF segment is laid out correctly but holds "XX" where the TIFF
+// byte order belongs, so exif-reader cannot parse it.
+const JPEG_WITH_BAD_EXIF = new Uint8Array([
+    ...[0xff, 0xd8], // start of image
+    ...[0xff, 0xe1, ...u16(2 + 6 + 2)], // APP1 and its length
+    ...[...ascii("Exif"), 0], // "Exif\0\0"
+    ...[0x58, 0x58], // "XX"
+    ...[0xff, 0xda, 0x00, 0x02], // start of scan
+]);
+
 describe("Photo save path, local copy, content and EXIF", () => {
     // The same account, with `files` in its album instead.
     class FilesClient extends MockClient {
@@ -407,6 +417,27 @@ describe("Photo save path, local copy, content and EXIF", () => {
         await lib.close();
     });
 
+    it("returns no EXIF fields for a JPEG whose EXIF cannot be parsed", async () => {
+        const lib = await open({
+            contentSource: stubSource(JPEG_WITH_BAD_EXIF),
+        });
+        expect(await lib.photos.byID({ fileID: 1 })!.exif()).toStrictEqual({});
+        await lib.close();
+    });
+
+    it("throws from exif() on a video without a content source, as the other content methods do", async () => {
+        const video = file(1, 1);
+        video.metadata.fileType = "video";
+        const lib = await open({
+            client: new FilesClient([video]),
+            contentSource: undefined,
+        });
+        await expect(lib.photos.byID({ fileID: 1 })!.exif()).rejects.toThrow(
+            /content cache/i,
+        );
+        await lib.close();
+    });
+
     it("returns no EXIF fields for a video, without fetching it", async () => {
         const video = file(1, 1);
         video.metadata.fileType = "video";

test/library/read.test.ts

@@ -209,7 +209,7 @@ describe("lib.photos", () => {
         expect("key" in photo.record()).toBe(false);
     });
 
-    it("byID exposes modifiedAt, hash, fileSize and the year taken", () => {
+    it("byID exposes modifiedAt, hash and the year taken", () => {
         // Mid-July, so the year is 2021 in every time zone.
         const takenAt = Date.UTC(2021, 6, 15, 12);
         const records = deriveRecords(
@@ -223,14 +223,12 @@ describe("lib.photos", () => {
                         modificationTime: micros(1_700_000_123_456),
                         hash: "aGFzaA==",
                     },
-                    file: { decryptionHeader: "aGVhZGVy", size: 2_048_000 },
                 }),
             ],
         );
         const photo = apis(records).photos.byID({ fileID: 1001 })!;
         expect(photo.modifiedAt).toBe(ms(1_700_000_123_456));
         expect(photo.hash).toBe("aGFzaA==");
-        expect(photo.fileSize).toBe(2_048_000);
         expect(photo.year).toBe(2021);
     });
 

test/library/records.test.ts

@@ -160,7 +160,6 @@ describe("deriveRecords: photo mapping", () => {
         expect("height" in rec).toBe(false);
         expect("latitude" in rec).toBe(false);
         expect("hash" in rec).toBe(false);
-        expect("fileSize" in rec).toBe(false);
     });
 
     it("reads archived and hidden from private magicMetadata.visibility", () => {