emailler/ip65/download.s

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; routine for downloading a URL
.include "zeropage.inc"
.include "../inc/common.inc"
TIMEOUT_SECONDS = 15
.importzp copy_src
.importzp copy_dest
.import copymem
.import timer_read
.import ip65_process
.import tcp_connect
.import tcp_send_string
.import tcp_send_data_len
.import tcp_callback
.import tcp_close
.import tcp_connect_ip
.import tcp_inbound_data_length
.import tcp_inbound_data_ptr
.import url_ip
.import url_port
.import url_selector
.import url_parse_buffer
.export url_download
.export url_download_buffer
.export url_download_buffer_length
.export resource_download
.export resource_buffer
.bss
src_ptr: .res 1
dest_ptr: .res 1
timeout_counter: .res 1
url_download_buffer: .res 2 ; points to a buffer that url will be downloaded into
url_download_buffer_length: .res 2 ; length of buffer that url will be downloaded into
resource_buffer: .res 2
resource_buffer_length: .res 2
download_flag: .res 1
.code
; download a resource specified by an URL
; caution - the selector built from the URL must fit into the url_download_buffer !!!
; inputs:
; AX = address of URL string
; url_download_buffer = points to a buffer that url will be downloaded into
; url_download_buffer_length = length of buffer
; outputs:
; sec if an error occured, else buffer pointed at by url_download_buffer is filled with contents
; of specified resource (with an extra 2 null bytes at the end),
; AX = length of resource downloaded.
url_download:
ldy url_download_buffer
sty url_selector
ldy url_download_buffer+1
sty url_selector+1
jsr url_parse_buffer
bcc resource_download
rts
; download a resource specified by ip,port & selector
; inputs:
; url_ip = ip address of host to connect to
; url_port = port number of to connect to
; url_selector = address of selector to send to host after connecting
; url_download_buffer = points to a buffer that url will be downloaded into
; url_download_buffer_length = length of buffer
; outputs:
; sec if an error occured, else buffer pointed at by url_download_buffer is filled with contents
; of specified resource (with an extra 2 null bytes at the end).
resource_download:
ldax url_download_buffer
stax resource_buffer
ldax url_download_buffer_length
stax resource_buffer_length
ldx #3 ; save IP address just retrieved
: lda url_ip,x
sta tcp_connect_ip,x
dex
bpl :-
ldax #url_download_callback
stax tcp_callback
ldax url_port
jsr tcp_connect
bcs @error
; connected, now send the selector
ldx #0
stx download_flag
ldax url_selector
jsr tcp_send_string
jsr put_zero_at_end_of_dl_buffer
jsr timer_read
txa
adc #TIMEOUT_SECONDS*4 ; what value should trigger the timeout?
sta timeout_counter
; now loop until we're done
@download_loop:
jsr ip65_process
jsr timer_read
cpx timeout_counter
beq @timeout
lda download_flag
beq @download_loop
@timeout:
jsr tcp_close
clc
@error:
rts
url_download_callback:
lda tcp_inbound_data_length+1
cmp #$ff
bne not_end_of_file
@end_of_file:
lda #1
sta download_flag
put_zero_at_end_of_dl_buffer:
; put a zero byte at the end of the file
ldax resource_buffer
stax ptr2
lda #0
tay
sta (ptr2),y
rts
not_end_of_file:
; copy this chunk to our input buffer
ldax resource_buffer
stax copy_dest
ldax tcp_inbound_data_ptr
stax copy_src
sec
lda resource_buffer_length
sbc tcp_inbound_data_length
pha
lda resource_buffer_length+1
sbc tcp_inbound_data_length+1
bcc @would_overflow_buffer
sta resource_buffer_length+1
pla
sta resource_buffer_length
ldax tcp_inbound_data_length
jsr copymem
; increment the pointer into the input buffer
clc
lda resource_buffer
adc tcp_inbound_data_length
sta resource_buffer
lda resource_buffer+1
adc tcp_inbound_data_length+1
sta resource_buffer+1
jmp put_zero_at_end_of_dl_buffer
@would_overflow_buffer:
pla ; clean up the stack
ldax resource_buffer_length
jsr copymem
lda resource_buffer
adc resource_buffer_length
sta resource_buffer
lda resource_buffer+1
adc resource_buffer_length+1
sta resource_buffer+1
lda #0
sta resource_buffer_length
sta resource_buffer_length+1
jmp put_zero_at_end_of_dl_buffer
; -- LICENSE FOR download.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 --