diff options
| author | Axel Fagerstedt <axel@Proteus.(none)> | 2012-11-15 12:37:47 +0100 |
|---|---|---|
| committer | Kalle Vahlman <kalle.vahlman@movial.com> | 2012-11-22 08:37:10 +0200 |
| commit | 90d6e62911b846544fe1a489529503ca67094d80 (patch) | |
| tree | f17510e5da0dc6ad8835c36385b5d80f0cad846c | |
| parent | b681455cdf3040c39793b76478b73ef58170900d (diff) | |
Split large writes into 16k chunks.
On some hosts LibusbDevice::write fails when for large buffers.
This is solved by splitting the write into 16k chunks.
| -rw-r--r-- | CDAL/LibusbDevice.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/CDAL/LibusbDevice.cpp b/CDAL/LibusbDevice.cpp index 6e2c670..9f7b3a2 100644 --- a/CDAL/LibusbDevice.cpp +++ b/CDAL/LibusbDevice.cpp @@ -20,6 +20,8 @@ using namespace std; #define MIN(A, B) ((A) < (B) ? (A) : (B)) +#define CHUNKSIZE 16384 //16 kB + LibusbDevice::LibusbDevice(libusb_device* device): device_(device) { int status = libusb_open(device_, &handle_); @@ -120,8 +122,10 @@ int LibusbDevice::write(void *buffer, size_t size) while (size) { int transfered; + int chunkSize = size > CHUNKSIZE ? CHUNKSIZE : size; + //Call with timeout to enable possible cancel - int error = libusb_bulk_transfer(handle_, outEndpoint_, src, size, &transfered, 0); + int error = libusb_bulk_transfer(handle_, outEndpoint_, src, chunkSize, &transfered, 0); if (error) { if (error == LIBUSB_ERROR_TIMEOUT) { |