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609 lines
13 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><link rel="stylesheet" type="text/css" href="ca65-doc-style.css"/></head><body><a href="ref_index.html"><h1>ip65 technical reference</h1></a><h1>File : ip65/xmodem.s</h1><pre> XMODEM file transfer
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</pre><h2 id="functions">functions</h2><table><tr><th>function</th><th>description</th></tr><tr><td id="xmodem_receive">xmodem_receive</td><td><pre>recieve a file via XMODEM (checksum mode only, not CRC)
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assumes that a tcp connection has already been set up, and that the other end is waiting to start sending
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inputs: AX points to routine to call once for each byte in downloaded file (e.g. save to disk, print to screen, whatever) - byte will be in A
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xmodem_iac_escape should be set to non-zero if the remote end escapes $FF bytes (i.e. if it is a real telnet server)
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outputs: none
</pre></td></tr><tr><td id="xmodem_send">xmodem_send</td><td><pre>send a file via XMODEM (checksum mode only, not CRC)
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assumes that a tcp connection has already been set up, and that the other end is waiting to start receiving
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inputs: AX points to routine to call once for each byte in file to send (e.g. save to disk, print to screen, whatever) - byte will be in A, carry flag set means EOF
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xmodem_iac_escape should be set to non-zero if the remote end escapes $FF bytes (i.e. if it is a real telnet server)
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outputs: none
</pre></td></tr></table><h2 id="variables">variables</h2><table><tr><th>variable</th><th>description</th><th>size (bytes)</th></tr><tr><td id="xmodem_iac_escape">xmodem_iac_escape</td><td>are IAC bytes ($FF) escaped?
</td><td>1</td></tr></table><h2>implementation</h2><pre id="code">; XMODEM file transfer
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.include "../inc/common.i"
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.ifndef KPR_API_VERSION_NUMBER
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.define EQU =
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.include "../inc/kipper_constants.i"
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.endif
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XMODEM_BLOCK_SIZE=$80 ;how many bytes (excluding header & checksum) in each block?
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XMODEM_TIMEOUT_SECONDS=5
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XMODEM_MAX_ERRORS=10
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SOH = $01
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EOT = $04
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ACK = $06
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NAK = $15
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CAN = $18
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PAD = $1A ;padding added to end of file
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.export xmodem_receive
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.export xmodem_send
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.export xmodem_iac_escape ;are IAC bytes ($FF) escaped?
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.import ip65_process
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.import ip65_error
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.import tcp_callback
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.import copymem
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.importzp copy_src
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.importzp copy_dest
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.import tcp_send
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.import tcp_send_data_len
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.import tcp_inbound_data_ptr
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.import tcp_inbound_data_length
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.import check_for_abort_key
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.import print_a
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.import print_cr
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.import print_ascii_as_native
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.import print_hex
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.import timer_seconds
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.segment "SELF_MODIFIED_CODE"
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got_byte:
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jmp $ffff
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get_byte:
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jmp $ffff
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next_char:
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lda buffer_length
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bne @not_eof
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lda buffer_length+1
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bne @not_eof
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sec
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rts
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@not_eof:
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next_char_ptr=*+1
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lda $ffff
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pha
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inc next_char_ptr
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bne :+
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inc next_char_ptr+1
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:
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sec
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lda buffer_length
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sbc #1
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sta buffer_length
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lda buffer_length+1
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sbc #0
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sta buffer_length+1
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pla
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clc
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rts
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emit_a:
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;put a byte to the output buffer
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;if the byte is $FF, and xmodem_iac_escape is not zero, it is doubled
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jsr @real_emit_a
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cmp #$ff
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bne exit_emit_a
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ldx xmodem_iac_escape
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beq exit_emit_a
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@real_emit_a:
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emit_a_ptr=*+1
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sta $ffff
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inc emit_a_ptr
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bne :+
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inc emit_a_ptr+1
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:
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inc xmodem_block_buffer_length
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bne :+
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inc xmodem_block_buffer_length+1
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:
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exit_emit_a:
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rts
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.bss
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original_tcp_callback: .res 2
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getc_timeout_end: .res 1
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getc_timeout_seconds: .res 1
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buffer_length: .res 2
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.code
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;send a file via XMODEM (checksum mode only, not CRC)
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;assumes that a tcp connection has already been set up, and that the other end is waiting to start receiving
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;inputs: AX points to routine to call once for each byte in file to send (e.g. save to disk, print to screen, whatever) - byte will be in A, carry flag set means EOF
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; xmodem_iac_escape should be set to non-zero if the remote end escapes $FF bytes (i.e. if it is a real telnet server)
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;outputs: none
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xmodem_send:
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stax get_byte+1
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jsr xmodem_transfer_setup
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lda #0
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sta at_eof
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@send_block:
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ldax #sending
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jsr print_ascii_as_native
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ldax #block_number_msg
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jsr print_ascii_as_native
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lda expected_block_number
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jsr print_hex
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jsr print_cr
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@wait_for_ack_or_nak:
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcs @synch_error
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cmp #ACK
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beq @got_ack
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cmp #NAK
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beq @got_nak
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@synch_error:
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pha
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lda user_abort
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beq @no_user_abort
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pla
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jmp xmodem_transfer_exit
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@no_user_abort:
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;flush the input buffer
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lda #0
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sta buffer_length
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lda buffer_length+1
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lda #'('
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jsr print_a
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pla
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jsr print_hex
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lda #')'
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jsr print_a
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inc error_number
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ldax #sync_error_msg
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jsr print_ascii_as_native
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ldax #error_count_msg
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jsr print_ascii_as_native
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lda error_number
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jsr print_hex
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jsr print_cr
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lda error_number
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cmp #XMODEM_MAX_ERRORS
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bcc @wait_for_ack_or_nak
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lda #KPR_ERROR_TOO_MANY_ERRORS
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sta ip65_error
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jmp xmodem_transfer_exit
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@got_ack:
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inc expected_block_number
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lda at_eof
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bne @send_eot
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@got_nak:
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lda #0
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sta checksum
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sta xmodem_block_buffer_length
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sta xmodem_block_buffer_length+1
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ldax #xmodem_block_buffer
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stax emit_a_ptr
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lda #SOH
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jsr emit_a
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lda expected_block_number
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jsr emit_a
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eor #$ff
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jsr emit_a
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lda #$80
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sta block_ptr
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@copy_one_byte:
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lda at_eof
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bne @add_pad_byte
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jsr get_byte
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bcc @got_byte
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;sec indicates EOF
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lda block_ptr
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cmp #$80 ;have we sent any data at all?
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bne @add_pad_byte
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@send_eot:
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;if we get here, we should send an EOT, then read an ACK
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ldax #1
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stax tcp_send_data_len
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ldax #eot_packet
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jsr tcp_send
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc ;should be an ACK coming back, doesn't really matter if we don't see it though
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jmp xmodem_transfer_exit
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@add_pad_byte:
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lda #PAD
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@got_byte:
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pha
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clc
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adc checksum
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sta checksum
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pla
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jsr emit_a
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dec block_ptr
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bne @copy_one_byte
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lda checksum
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jsr emit_a
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ldax xmodem_block_buffer_length
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stax tcp_send_data_len
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ldax #xmodem_block_buffer
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jsr tcp_send
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bcc @send_ok
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ldax #send_error
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jsr print_ascii_as_native
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lda ip65_error
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jsr print_hex
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jsr print_cr
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@send_ok:
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jmp @send_block
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rts
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xmodem_transfer_setup:
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lda #0
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sta buffer_length
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sta buffer_length+1
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sta error_number
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sta user_abort
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lda #1
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sta expected_block_number
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ldax tcp_callback
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stax original_tcp_callback
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ldax #xmodem_tcp_callback
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stax tcp_callback
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rts
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;recieve a file via XMODEM (checksum mode only, not CRC)
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;assumes that a tcp connection has already been set up, and that the other end is waiting to start sending
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;inputs: AX points to routine to call once for each byte in downloaded file (e.g. save to disk, print to screen, whatever) - byte will be in A
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; xmodem_iac_escape should be set to non-zero if the remote end escapes $FF bytes (i.e. if it is a real telnet server)
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;outputs: none
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xmodem_receive:
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stax got_byte+1
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jsr xmodem_transfer_setup
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jsr send_nak
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@next_block:
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lda #0
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sta block_ptr
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sta checksum
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ldax #expecting
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jsr print_ascii_as_native
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ldax #block_number_msg
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jsr print_ascii_as_native
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lda expected_block_number
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jsr print_hex
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jsr print_cr
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@wait_for_block_start:
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc @got_block_start
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lda user_abort
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beq @no_user_abort
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sec
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jmp xmodem_transfer_exit
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@no_user_abort:
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jsr send_nak
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inc error_number
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ldax #timeout_msg
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jsr print_ascii_as_native
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ldax #error_count_msg
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jsr print_ascii_as_native
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lda error_number
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jsr print_hex
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jsr print_cr
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lda error_number
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cmp #XMODEM_MAX_ERRORS
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bcc @wait_for_block_start
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lda #KPR_ERROR_TOO_MANY_ERRORS
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sta ip65_error
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jmp xmodem_transfer_exit
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@got_block_start:
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cmp #EOT
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bne :+
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ldax #got_eot
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jsr print_ascii_as_native
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jsr send_ack
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clc
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jmp xmodem_transfer_exit
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:
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cmp #$81 ;jamming signal BBS seems to use $81 not $01 as SOH
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beq @got_soh
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cmp #SOH
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beq @got_soh
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lda #'!' ;we got an unexpected character
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jsr print_a
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jsr print_hex
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;we need to clear the input buffer
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@clear_input_buffer:
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lda #'!' ;we got an unexpected character
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jsr print_a
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lda #1
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jsr getc
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bcc @clear_input_buffer
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jmp @wait_for_block_start
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@got_soh:
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;now get block number
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc :+
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jsr send_nak
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lda #'.'
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jmp print_a
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jmp @wait_for_block_start
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:
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sta actual_block_number
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;now get block number check
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc :+
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lda #'.'
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jmp print_a
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jsr send_nak
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jmp @wait_for_block_start
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:
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adc actual_block_number
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cmp #$ff
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beq :+
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lda #'?'
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jsr print_a
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jmp @wait_for_block_start
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:
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ldax #receiving
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jsr print_ascii_as_native
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ldax #block_number_msg
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jsr print_ascii_as_native
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lda actual_block_number
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jsr print_hex
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jsr print_cr
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@next_byte:
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc :+
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jmp xmodem_transfer_exit
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:
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ldx block_ptr
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sta xmodem_block_buffer,x
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adc checksum
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sta checksum
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inc block_ptr
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lda block_ptr
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bpl @next_byte
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ldax #checksum_msg
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jsr print_ascii_as_native
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lda checksum
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jsr print_hex
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lda #'/'
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jsr print_a
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcs xmodem_transfer_exit
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sta received_checksum
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jsr print_hex
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jsr print_cr
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lda received_checksum
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cmp checksum
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beq @checksum_ok
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;checksum error :-(
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inc error_number
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ldax #checksum_error_msg
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jsr print_ascii_as_native
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ldax #error_count_msg
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jsr print_ascii_as_native
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lda error_number
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jsr print_hex
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jsr print_cr
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lda error_number
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cmp #XMODEM_MAX_ERRORS
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bcs :+
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jmp @wait_for_block_start
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:
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lda #KPR_ERROR_TOO_MANY_ERRORS
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sta ip65_error
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jmp xmodem_transfer_exit
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jsr send_nak
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jmp @next_block
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@checksum_ok:
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lda expected_block_number
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cmp actual_block_number
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bne @skip_block_output
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lda #0
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sta block_ptr
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@output_byte:
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ldx block_ptr
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lda xmodem_block_buffer,x
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jsr got_byte
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inc block_ptr
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lda block_ptr
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bpl @output_byte
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||
|
inc expected_block_number
|
||
|
|
||
|
@skip_block_output:
|
||
|
jsr send_ack
|
||
|
jmp @next_block
|
||
|
|
||
|
clc
|
||
|
|
||
|
xmodem_transfer_exit:
|
||
|
ldax original_tcp_callback
|
||
|
stax tcp_callback
|
||
|
|
||
|
rts
|
||
|
|
||
|
xmodem_tcp_callback:
|
||
|
lda tcp_inbound_data_length+1
|
||
|
cmp #$ff
|
||
|
bne @not_eof
|
||
|
rts
|
||
|
@not_eof:
|
||
|
|
||
|
ldax tcp_inbound_data_ptr
|
||
|
stax copy_src
|
||
|
ldax #xmodem_stream_buffer
|
||
|
stax copy_dest
|
||
|
stax next_char_ptr
|
||
|
|
||
|
ldax tcp_inbound_data_length
|
||
|
stax buffer_length
|
||
|
jsr copymem
|
||
|
rts
|
||
|
|
||
|
send_nak:
|
||
|
ldax #1
|
||
|
stax tcp_send_data_len
|
||
|
ldax #nak_packet
|
||
|
jmp tcp_send
|
||
|
|
||
|
send_ack:
|
||
|
ldax #1
|
||
|
stax tcp_send_data_len
|
||
|
ldax #ack_packet
|
||
|
jmp tcp_send
|
||
|
|
||
|
|
||
|
getc:
|
||
|
jsr @real_getc
|
||
|
bcc :+ ;of we got an error, then bail
|
||
|
rts
|
||
|
:
|
||
|
cmp #$ff
|
||
|
beq @got_ff
|
||
|
clc
|
||
|
rts
|
||
|
@got_ff:
|
||
|
lda xmodem_iac_escape
|
||
|
bne @real_getc ;need to skip over the $FF and go read another byte
|
||
|
lda #$ff
|
||
|
clc
|
||
|
rts
|
||
|
|
||
|
@real_getc:
|
||
|
sta getc_timeout_seconds
|
||
|
|
||
|
clc
|
||
|
jsr timer_seconds ;time of day clock: seconds (in BCD)
|
||
|
sed
|
||
|
adc getc_timeout_seconds
|
||
|
cmp #$60
|
||
|
bcc @timeout_set
|
||
|
sec
|
||
|
sbc #$60
|
||
|
@timeout_set:
|
||
|
cld
|
||
|
sta getc_timeout_end
|
||
|
|
||
|
@poll_loop:
|
||
|
jsr next_char
|
||
|
bcs @no_char
|
||
|
rts ;done!
|
||
|
@no_char:
|
||
|
jsr check_for_abort_key
|
||
|
bcc @no_abort
|
||
|
lda #KPR_ERROR_ABORTED_BY_USER
|
||
|
sta ip65_error
|
||
|
inc user_abort
|
||
|
rts
|
||
|
@no_abort:
|
||
|
jsr ip65_process
|
||
|
jsr timer_seconds ;time of day clock: seconds
|
||
|
cmp getc_timeout_end
|
||
|
bne @poll_loop
|
||
|
lda #00
|
||
|
sec
|
||
|
rts
|
||
|
|
||
|
|
||
|
|
||
|
.rodata
|
||
|
ack_packet: .byte ACK
|
||
|
nak_packet: .byte NAK
|
||
|
eot_packet: .byte EOT
|
||
|
|
||
|
block_number_msg: .byte " block $",0
|
||
|
expecting: .byte "expecting",0
|
||
|
receiving: .byte "receiving",0
|
||
|
sending: .byte "sending",0
|
||
|
got_eot: .byte "end of transmission",10,0
|
||
|
|
||
|
bad_block_number: .byte "bad block number",0
|
||
|
checksum_msg: .byte "checksum $",0
|
||
|
checksum_error_msg : .byte "checksum",0
|
||
|
timeout_msg: .byte "timeout error",0
|
||
|
sync_error_msg: .byte "sync",0
|
||
|
error_count_msg: .byte " error - error count $",0
|
||
|
send_error: .byte " send error - $",0
|
||
|
|
||
|
.segment "APP_SCRATCH"
|
||
|
xmodem_stream_buffer: .res 1600
|
||
|
xmodem_block_buffer: .res 300
|
||
|
xmodem_block_buffer_length: .res 2
|
||
|
expected_block_number: .res 1
|
||
|
actual_block_number: .res 1
|
||
|
checksum: .res 1
|
||
|
received_checksum: .res 1
|
||
|
block_ptr: .res 1
|
||
|
error_number: .res 1
|
||
|
user_abort: .res 1
|
||
|
xmodem_iac_escape: .res 1
|
||
|
at_eof: .res 1
|
||
|
;-- LICENSE FOR xmodem.s --
|
||
|
; The contents of this file are subject to the Mozilla Public License
|
||
|
; Version 1.1 (the "License"); you may not use this file except in
|
||
|
; compliance with the License. You may obtain a copy of the License at
|
||
|
; http://www.mozilla.org/MPL/
|
||
|
;
|
||
|
; Software distributed under the License is distributed on an "AS IS"
|
||
|
; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
|
||
|
; License for the specific language governing rights and limitations
|
||
|
; under the License.
|
||
|
;
|
||
|
; The Original Code is ip65.
|
||
|
;
|
||
|
; The Initial Developer of the Original Code is Jonno Downes,
|
||
|
; jonno@jamtronix.com.
|
||
|
; Portions created by the Initial Developer are Copyright (C) 2009
|
||
|
; Jonno Downes. All Rights Reserved.
|
||
|
; -- LICENSE END --
|
||
|
</pre></body></html>
|