235 lines
5.1 KiB
ArmAsm
235 lines
5.1 KiB
ArmAsm
; routines for parsing a HTTP request
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; to use - first call http_parse_request, then call http_get_value to get method name, path, and variable values
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; NB - this routine uses the same buffer space and zero page locations as many other ip65 routines. so do not call
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; other ip65 routines between the http_parse_request & http_get_value else odd things will happen.
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.include "zeropage.inc"
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.include "../inc/common.inc"
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.export http_parse_request
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.export http_get_value
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.import output_buffer
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.import parse_hex_digits
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string_ptr = ptr1
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table_ptr = ptr2
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.bss
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var_buf: .res $300 ; work area for storing variables extracted from query string
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var_name: .res 1
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hex_digit: .res 1
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.code
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; split a HTTP request into method (e.g. GET or POST), the path, and any querystring variables
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; NB only the first letter in a variable name is significant. i.e. if a querystring contains variables 'a','alpha' & 'alabama', only the first one in will be retreivable.
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; the method is stored in var $01
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; the path is stored in var $02
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; for example, parsing "GET /goober?a=foo&alpha=beta" would result in:
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; value of A when calling http_get_value value returned by http_get_value
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; #$01 "GET"
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; #$02 "/goober"
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; #'a' "foo"
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; #'A' (error)
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; inputs:
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; AX = pointer to HTTP request
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; outputs:
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; none - but values can be retrieved through subsequent calls to http_get_value
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http_parse_request:
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stax string_ptr
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ldax #var_buf
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stax table_ptr
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lda #1 ; start of method
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ldy #0
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jsr put_byte
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lda (string_ptr),y
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cmp #'/'
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beq @gopher
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jsr @check_end_of_string
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bcs @gopher
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lda (string_ptr),y
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@extract_method:
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cmp #' '
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beq @end_of_method
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jsr @check_end_of_string
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bcc :+
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jmp @done
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: jsr put_byte
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jsr get_next_byte_in_source
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jmp @extract_method
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@gopher:
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jsr @output_end_of_method
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lda #'/'
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jmp @got_path_char
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@output_end_of_method:
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lda #0 ; end of method
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jsr put_byte
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lda #2 ; start of path
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jmp put_byte
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@end_of_method:
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jsr @output_end_of_method
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@extract_path:
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jsr get_next_byte_in_source
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jsr @check_end_of_string
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bcs @done
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cmp #'?'
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beq @end_of_path
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cmp #'&'
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beq @end_of_path
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@got_path_char:
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jsr put_byte
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jmp @extract_path
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@end_of_path:
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lda #0 ; end of path
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jsr put_byte
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@next_var:
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jsr get_next_byte_in_source
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jsr @check_end_of_string
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bcs @done
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jsr put_byte
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@skip_to_equals:
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jsr get_next_byte_in_source
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jsr @check_end_of_string
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bcs @done
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cmp #'?'
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beq @next_var
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cmp #'&'
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beq @next_var
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cmp #'='
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beq @got_var
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jmp @skip_to_equals
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@got_var:
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jsr get_next_byte_in_source
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jsr @check_end_of_string
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bcs @done
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cmp #'?'
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beq @end_of_var
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cmp #'&'
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beq @end_of_var
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cmp #'%'
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beq @get_percent_encoded_byte
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cmp #'+'
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bne :+
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lda #' '
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:
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@got_byte:
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jsr put_byte
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jmp @got_var
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@end_of_var:
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lda #0
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jsr put_byte
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jmp @next_var
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@done:
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lda #0
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jsr put_byte
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jsr put_byte
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rts
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@check_end_of_string:
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cmp #0
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beq @end_of_string
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cmp #' '
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beq @end_of_string
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cmp #$0a
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beq @end_of_string
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cmp #$0d
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beq @end_of_string
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clc
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rts
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@end_of_string:
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sec
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rts
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@get_percent_encoded_byte:
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jsr get_next_byte_in_source
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tax
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jsr get_next_byte_in_source
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jsr parse_hex_digits
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jmp @got_byte
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put_byte:
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sta (table_ptr),y
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inc table_ptr
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bne :+
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inc table_ptr+1
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: rts
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; retrieve the value of a variable defined in the previously parsed HTTP request.
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; inputs:
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; A = variable to retrieve.
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; to get the method (GET/POST/HEAD), pass A=$01.
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; to get the path (everything between the method and the first '?'), pass A=$02.
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; outputs:
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; if variable exists in HTTP request, carry flag will be clear and AX points to value (null terminated string)
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; if variable did not exist, carry flag will be set.
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http_get_value:
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sta var_name
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ldax #var_buf
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stax string_ptr
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ldy #0
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lda (string_ptr),y
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@check_next_var:
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beq @end_of_vars
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cmp var_name
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beq @got_var
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; not the var we want, so skip over till next byte
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@skip_till_null_byte:
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jsr get_next_byte_in_source
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bne @skip_till_null_byte
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jsr get_next_byte_in_source
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bne @check_next_var
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@end_of_vars:
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sec
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rts
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@got_var:
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jsr get_next_byte_in_source
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ldax string_ptr
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clc
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rts
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get_next_byte_in_source:
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inc string_ptr
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bne :+
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inc string_ptr+1
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: lda (string_ptr),y
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rts
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; -- LICENSE FOR http.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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