morluto
248133d784
Pass parsed MIPS program declarations to shared-load analysis and validate IDA string address selectors before enumeration, including empty inventories.
36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
import { err, ok } from "./result.js";
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export type ElfProgramHeader = Extract<
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ReturnType<typeof readElfProgramHeader>,
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{ readonly ok: true }
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>["value"];
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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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