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56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
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export type FileByteRange =
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| { status: 200; start: number; end: number }
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| { status: 206; start: number; end: number }
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| { status: 416 };
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/** Resolve one RFC 7233 byte range. Multipart ranges are intentionally rejected. */
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export function resolveFileByteRange(
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rangeHeader: string | null,
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size: number
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): FileByteRange {
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if (!rangeHeader) {
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return { status: 200, start: 0, end: Math.max(0, size - 1) };
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}
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if (size <= 0) return { status: 416 };
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const match = /^bytes=(\d*)-(\d*)$/i.exec(rangeHeader.trim());
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if (!match || (!match[1] && !match[2])) return { status: 416 };
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let start = 0;
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let end = size - 1;
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if (!match[1] && match[2]) {
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const suffixLength = Number(match[2]);
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if (!Number.isFinite(suffixLength) || suffixLength <= 0) {
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return { status: 416 };
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}
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start = Math.max(0, size - suffixLength);
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} else {
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start = Number(match[1]);
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end = match[2] ? Number(match[2]) : end;
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}
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if (
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!Number.isFinite(start) ||
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!Number.isFinite(end) ||
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start < 0 ||
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end < start ||
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start >= size
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) {
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return { status: 416 };
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}
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return { status: 206, start, end: Math.min(end, size - 1) };
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}
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