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Merge pull request #2544 from balena-io/usbboot-limit-transfer-size
Usbboot limit transfer size
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commit
b298e53fc4
2
Makefile
2
Makefile
@ -201,7 +201,7 @@ lint-spell:
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codespell \
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--dictionary - \
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--dictionary dictionary.txt \
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--skip *.gz,*.bz2,*.xz,*.zip,*.img,*.dmg,*.iso,*.rpi-sdcard,.DS_Store,*.dtb,*.dtbo,*.dat,*.elf,*.bin,*.foo,xz-without-extension \
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--skip *.svg *.gz,*.bz2,*.xz,*.zip,*.img,*.dmg,*.iso,*.rpi-sdcard,.DS_Store,*.dtb,*.dtbo,*.dat,*.elf,*.bin,*.foo,xz-without-extension \
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lib tests docs scripts Makefile *.md LICENSE
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lint: lint-js lint-sass lint-cpp lint-html lint-spell
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@ -30,6 +30,8 @@ const usb = require('./usb')
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const NULL_BUFFER_SIZE = 0
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const NULL_BUFFER = Buffer.alloc(NULL_BUFFER_SIZE)
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const ONE_MEGABYTE = 1048576
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/**
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* @summary The size of the boot message bootcode length section
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* @type {Number}
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@ -206,6 +208,12 @@ exports.sendBufferSize = (device, size) => {
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})
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}
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const chunks = function *(buffer, size) {
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for (let start = 0; start < buffer.length; start += size) {
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yield buffer.slice(start, start + size)
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}
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}
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/**
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* @summary Write a buffer to an OUT endpoint
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* @function
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@ -231,9 +239,11 @@ exports.write = (device, endpoint, buffer) => {
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.delay(USB_REQUEST_DELAY_MS)
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.then(() => {
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return Bluebird.fromCallback((callback) => {
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endpoint.timeout = USB_BULK_TRANSFER_TIMEOUT_MS
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endpoint.transfer(buffer, callback)
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endpoint.timeout = USB_BULK_TRANSFER_TIMEOUT_MS
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return Bluebird.each(chunks(buffer, ONE_MEGABYTE), (chunk) => {
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return Bluebird.fromCallback((callback) => {
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endpoint.transfer(chunk, callback)
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})
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})
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})
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}
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