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6a296b2058
parse_url stores the URL selector in the output_buffer - which is currently 520 bytes. A new entry point called parse_url_buffer was added which instead stores the URL selector in a buffer provided by the user. url_download now calls the new parse_url_buffer instead of parse_url. The buffer for the URL selector is simply the download_buffer. So the download_buffer is used twice: First to hold the URL selector to be sent as request to the server and then to hold the response received from the server. However, the URL selector still can't exceed the MSS (aka 1460 bytes). Note: The User-Agent string was shortened by two bytes as that allows a "default" URL (incl. 'http://' but without port number) of exactly 1400 bytes to end up as 1460 bytes URL selector.
201 lines
4.9 KiB
ArmAsm
201 lines
4.9 KiB
ArmAsm
; routine for downloading a URL
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.include "zeropage.inc"
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.include "../inc/common.inc"
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TIMEOUT_SECONDS = 15
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.importzp copy_src
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.importzp copy_dest
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.import copymem
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.import timer_read
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.import ip65_process
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.import tcp_connect
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.import tcp_send_string
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.import tcp_send_data_len
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.import tcp_callback
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.import tcp_close
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.import tcp_connect_ip
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.import tcp_inbound_data_length
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.import tcp_inbound_data_ptr
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.import url_ip
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.import url_port
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.import url_selector
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.import url_parse_buffer
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.export url_download
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.export url_download_buffer
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.export url_download_buffer_length
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.export resource_download
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.export resource_buffer
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.bss
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src_ptr: .res 1
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dest_ptr: .res 1
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timeout_counter: .res 1
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url_download_buffer: .res 2 ; points to a buffer that url will be downloaded into
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url_download_buffer_length: .res 2 ; length of buffer that url will be downloaded into
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resource_buffer: .res 2
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resource_buffer_length: .res 2
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download_flag: .res 1
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.code
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; download a resource specified by an URL
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; caution - the selector built from the URL must fit into the url_download_buffer !!!
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; inputs:
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; AX = address of URL string
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; url_download_buffer = points to a buffer that url will be downloaded into
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; url_download_buffer_length = length of buffer
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; outputs:
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; sec if an error occured, else buffer pointed at by url_download_buffer is filled with contents
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; of specified resource (with an extra 2 null bytes at the end),
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; AX = length of resource downloaded.
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url_download:
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ldy url_download_buffer
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sty url_selector
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ldy url_download_buffer+1
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sty url_selector+1
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jsr url_parse_buffer
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bcc resource_download
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rts
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; download a resource specified by ip,port & selector
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; inputs:
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; url_ip = ip address of host to connect to
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; url_port = port number of to connect to
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; url_selector = address of selector to send to host after connecting
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; url_download_buffer = points to a buffer that url will be downloaded into
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; url_download_buffer_length = length of buffer
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; outputs:
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; sec if an error occured, else buffer pointed at by url_download_buffer is filled with contents
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; of specified resource (with an extra 2 null bytes at the end).
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resource_download:
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ldax url_download_buffer
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stax resource_buffer
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ldax url_download_buffer_length
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stax resource_buffer_length
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ldx #3 ; save IP address just retrieved
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: lda url_ip,x
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sta tcp_connect_ip,x
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dex
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bpl :-
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ldax #url_download_callback
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stax tcp_callback
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ldax url_port
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jsr tcp_connect
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bcs @error
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; connected, now send the selector
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ldx #0
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stx download_flag
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ldax url_selector
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jsr tcp_send_string
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jsr put_zero_at_end_of_dl_buffer
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jsr timer_read
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txa
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adc #TIMEOUT_SECONDS*4 ; what value should trigger the timeout?
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sta timeout_counter
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; now loop until we're done
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@download_loop:
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jsr ip65_process
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jsr timer_read
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cpx timeout_counter
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beq @timeout
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lda download_flag
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beq @download_loop
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@timeout:
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jsr tcp_close
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clc
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@error:
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rts
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url_download_callback:
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lda tcp_inbound_data_length+1
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cmp #$ff
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bne not_end_of_file
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@end_of_file:
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lda #1
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sta download_flag
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put_zero_at_end_of_dl_buffer:
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; put a zero byte at the end of the file
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ldax resource_buffer
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stax ptr2
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lda #0
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tay
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sta (ptr2),y
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rts
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not_end_of_file:
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; copy this chunk to our input buffer
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ldax resource_buffer
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stax copy_dest
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ldax tcp_inbound_data_ptr
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stax copy_src
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sec
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lda resource_buffer_length
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sbc tcp_inbound_data_length
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pha
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lda resource_buffer_length+1
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sbc tcp_inbound_data_length+1
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bcc @would_overflow_buffer
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sta resource_buffer_length+1
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pla
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sta resource_buffer_length
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ldax tcp_inbound_data_length
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jsr copymem
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; increment the pointer into the input buffer
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clc
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lda resource_buffer
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adc tcp_inbound_data_length
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sta resource_buffer
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lda resource_buffer+1
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adc tcp_inbound_data_length+1
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sta resource_buffer+1
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jmp put_zero_at_end_of_dl_buffer
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@would_overflow_buffer:
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pla ; clean up the stack
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ldax resource_buffer_length
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jsr copymem
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lda resource_buffer
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adc resource_buffer_length
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sta resource_buffer
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lda resource_buffer+1
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adc resource_buffer_length+1
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sta resource_buffer+1
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lda #0
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sta resource_buffer_length
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sta resource_buffer_length+1
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jmp put_zero_at_end_of_dl_buffer
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; -- LICENSE FOR download.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Jonno Downes,
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; jonno@jamtronix.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Jonno Downes. All Rights Reserved.
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; -- LICENSE END --
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