@microbit/microbit-fs
Version:
Manipulate files in a micro:bit MicroPython Intel Hex file.
91 lines • 3.57 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getUint64 = getUint64;
exports.getUint32 = getUint32;
exports.getUint16 = getUint16;
exports.getUint8 = getUint8;
exports.getString = getString;
/**
* Utilities for retrieving data from MemoryMap instances from the nrf-intel-hex
* library.
*/
const common_js_1 = require("./common.js");
/**
* Reads a 64 bit little endian number from an Intel Hex memory map.
*
* Any missing data in that address range that is not contained inside the
* MemoryMap is filled with 0xFF.
*
* @param intelHexMap - Memory map of the Intel Hex data.
* @param address - Start address of the 32 bit number.
* @returns Number with the unsigned integer representation of those 8 bytes.
*/
function getUint64(intelHexMap, address) {
const uint64Data = intelHexMap.slicePad(address, 8, 0xff);
// Typed arrays use the native endianness, force little endian with DataView
return new DataView(uint64Data.buffer).getUint32(0, true /* little endian */);
}
/**
* Reads a 32 bit little endian number from an Intel Hex memory map.
*
* Any missing data in that address range that is not contained inside the
* MemoryMap is filled with 0xFF.
*
* @param intelHexMap - Memory map of the Intel Hex data.
* @param address - Start address of the 32 bit number.
* @returns Number with the unsigned integer representation of those 4 bytes.
*/
function getUint32(intelHexMap, address) {
const uint32Data = intelHexMap.slicePad(address, 4, 0xff);
// Typed arrays use the native endianness, force little endian with DataView
return new DataView(uint32Data.buffer).getUint32(0, true /* little endian */);
}
/**
* Reads a 16 bit little endian number from an Intel Hex memory map.
*
* Any missing data in that address range that is not contained inside the
* MemoryMap is filled with 0xFF.
*
* @param intelHexMap - Memory map of the Intel Hex data.
* @param address - Start address of the 16 bit number.
* @returns Number with the unsigned integer representation of those 2 bytes.
*/
function getUint16(intelHexMap, address) {
const uint16Data = intelHexMap.slicePad(address, 2, 0xff);
// Typed arrays use the native endianness, force little endian with DataView
return new DataView(uint16Data.buffer).getUint16(0, true /* little endian */);
}
/**
* Reads a 8 bit number from an Intel Hex memory map.
*
* If the data is not contained inside the MemoryMap it returns 0xFF.
*
* @param intelHexMap - Memory map of the Intel Hex data.
* @param address - Start address of the 16 bit number.
* @returns Number with the unsigned integer representation of those 2 bytes.
*/
function getUint8(intelHexMap, address) {
const uint16Data = intelHexMap.slicePad(address, 1, 0xff);
return uint16Data[0];
}
/**
* Decodes a UTF-8 null terminated string stored in the Intel Hex data at
* the indicated address.
*
* @param intelHexMap - Memory map of the Intel Hex data.
* @param address - Start address for the string.
* @returns String read from the Intel Hex data.
*/
function getString(intelHexMap, address) {
const memBlock = intelHexMap.slice(address).get(address);
let iStrEnd = 0;
while (iStrEnd < memBlock.length && memBlock[iStrEnd] !== 0)
iStrEnd++;
if (iStrEnd === memBlock.length) {
// Could not find a null character to indicate the end of the string
return '';
}
const stringBytes = memBlock.slice(0, iStrEnd);
return (0, common_js_1.bytesToStr)(stringBytes);
}
//# sourceMappingURL=hex-map-utils.js.map