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morluto
9341b116ef
Share exact ELF program-header facts across nine consumers while preserving their admission and precision policies. Centralize conformance path and digest binding, retain verifier-specific checks, and route fixture-owner changes to CI qualification.
31 lines
998 B
TypeScript
31 lines
998 B
TypeScript
import { err, ok } from "./result.js";
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/** Fixed ELF32/ELF64 program declarations; consumers own type, precision and mapping admission. */
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export const readElfProgramHeader = (
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bytes: Uint8Array,
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bits: 32 | 64,
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littleEndian: boolean,
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) => {
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const wide = bits === 64;
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if (bytes.byteLength < (wide ? 56 : 32))
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return err({
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kind: "malformed" as const,
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message: "ELF program header is truncated",
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});
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const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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const word = (at: number): bigint =>
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wide
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? view.getBigUint64(at, littleEndian)
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: BigInt(view.getUint32(at, littleEndian));
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return ok({
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type: view.getUint32(0, littleEndian),
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flags: view.getUint32(wide ? 4 : 24, littleEndian),
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offset: word(wide ? 8 : 4),
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virtualAddress: word(wide ? 16 : 8),
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physicalAddress: word(wide ? 24 : 12),
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fileSize: word(wide ? 32 : 16),
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memorySize: word(wide ? 40 : 20),
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alignment: word(wide ? 48 : 28),
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});
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};
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