Code doesn't properly handles sends that are bigger than 256 packets

[drorcohen]

thanks for this project.
Here's my suggested patch that fixes the problem:

commit 5e62af2aa8680164e5b7bd19642ef406054c55cd (HEAD -> handle_files_larger_than_256_packets)
Author: Dror Cohen [email protected]
Date: Tue Jul 10 14:52:28 2018 -0700

This fixes an issue when dealing with files that are bigger than 256 packets

diff --git a/xmodem/xmodem.go b/xmodem/xmodem.go
index 54e6ad3..1b8b62f 100644
--- a/xmodem/xmodem.go
+++ b/xmodem/xmodem.go
@@ -115,18 +115,18 @@ func ModemSend(c io.ReadWriter, data []byte) error {
}

    if oBuffer[0] == POLL {

•           var blocks uint8 = uint8(len(data) / LONG_PACKET_PAYLOAD_LEN)
  

•           blocks := len(data) / LONG_PACKET_PAYLOAD_LEN
            if len(data) > int(int(blocks)*int(LONG_PACKET_PAYLOAD_LEN)) {
                    blocks++
            }
  
            failed := 0
  

•           var currentBlock uint8 = 0
  

•           currentBlock := 0
            for currentBlock < blocks && failed < 10 {
                    if int(int(currentBlock+1)*int(LONG_PACKET_PAYLOAD_LEN)) > len(data) {
  

•                           sendBlock(c, currentBlock+1, data[int(currentBlock)*int(LONG_PACKET_PAYLOAD_LEN):])
  

•                           sendBlock(c, uint8(currentBlock+1), data[int(currentBlock)*int(LONG_PACKET_PAYLOAD_LEN):])
                    } else {
  

•                           sendBlock(c, currentBlock+1, data[int(currentBlock)*int(LONG_PACKET_PAYLOAD_LEN):(int(currentBlock)+1)*int(LONG_PACKET_PAYLOAD_LEN)])
  

•                           sendBlock(c, uint8(currentBlock+1), data[int(currentBlock)*int(LONG_PACKET_PAYLOAD_LEN):(int(currentBlock)+1)*int(LONG_PACKET_PAYLOAD_LEN)])
                    }
  
                    if _, err := c.Read(oBuffer); err != nil {