350 lines
10 KiB
Matlab
350 lines
10 KiB
Matlab
function submitWeb(partId)
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%SUBMITWEB Generates a base64 encoded string for web-based submissions
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% SUBMITWEB() will generate a base64 encoded string so that you can submit your
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% solutions via a web form
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fprintf('==\n== [ml-class] Submitting Solutions | Programming Exercise %s\n==\n', ...
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homework_id());
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if ~exist('partId', 'var') || isempty(partId)
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partId = promptPart();
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end
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% Check valid partId
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partNames = validParts();
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if ~isValidPartId(partId)
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fprintf('!! Invalid homework part selected.\n');
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fprintf('!! Expected an integer from 1 to %d.\n', numel(partNames));
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fprintf('!! Submission Cancelled\n');
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return
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end
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[login] = loginPrompt();
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if isempty(login)
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fprintf('!! Submission Cancelled\n');
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return
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end
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[result] = submitSolution(login, partId, output(partId), ...
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source(partId));
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result = base64encode(result);
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fprintf('\nSave as submission file [submit_ex%s_part%d.txt]: ', ...
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homework_id(), partId);
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saveAsFile = input('', 's');
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if (isempty(saveAsFile))
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saveAsFile = sprintf('submit_ex%s_part%d.txt', homework_id(), partId);
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end
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fid = fopen(saveAsFile, 'w');
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if (fid)
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fwrite(fid, result);
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fclose(fid);
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fprintf('\nSaved your solutions to %s.\n\n', saveAsFile);
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fprintf(['You can now submit your solutions through the web \n' ...
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'form in the programming exercises. Select the corresponding \n' ...
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'programming exercise to access the form.\n']);
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else
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fprintf('Unable to save to %s\n\n', saveAsFile);
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fprintf(['You can create a submission file by saving the \n' ...
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'following text in a file: (press enter to continue)\n\n']);
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pause;
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fprintf(result);
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end
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end
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% ================== CONFIGURABLES FOR EACH HOMEWORK ==================
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function id = homework_id()
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id = '2';
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end
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function [partNames] = validParts()
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partNames = { 'Sigmoid Function ', ...
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'Logistic Regression Cost', ...
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'Logistic Regression Gradient', ...
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'Predict', ...
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'Regularized Logistic Regression Cost' ...
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'Regularized Logistic Regression Gradient' ...
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};
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end
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function srcs = sources()
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% Separated by part
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srcs = { { 'sigmoid.m' }, ...
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{ 'costFunction.m' }, ...
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{ 'costFunction.m' }, ...
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{ 'predict.m' }, ...
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{ 'costFunctionReg.m' }, ...
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{ 'costFunctionReg.m' } };
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end
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function out = output(partId)
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% Random Test Cases
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X = [ones(20,1) (exp(1) * sin(1:1:20))' (exp(0.5) * cos(1:1:20))'];
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y = sin(X(:,1) + X(:,2)) > 0;
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if partId == 1
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out = sprintf('%0.5f ', sigmoid(X));
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elseif partId == 2
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out = sprintf('%0.5f ', costFunction([0.25 0.5 -0.5]', X, y));
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elseif partId == 3
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[cost, grad] = costFunction([0.25 0.5 -0.5]', X, y);
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out = sprintf('%0.5f ', grad);
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elseif partId == 4
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out = sprintf('%0.5f ', predict([0.25 0.5 -0.5]', X));
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elseif partId == 5
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out = sprintf('%0.5f ', costFunctionReg([0.25 0.5 -0.5]', X, y, 0.1));
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elseif partId == 6
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[cost, grad] = costFunctionReg([0.25 0.5 -0.5]', X, y, 0.1);
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out = sprintf('%0.5f ', grad);
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end
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end
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% ========================= SUBMIT HELPERS =========================
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function src = source(partId)
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src = '';
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src_files = sources();
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if partId <= numel(src_files)
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flist = src_files{partId};
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for i = 1:numel(flist)
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fid = fopen(flist{i});
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while ~feof(fid)
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line = fgets(fid);
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src = [src line];
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end
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fclose(fid);
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src = [src '||||||||'];
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end
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end
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end
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function ret = isValidPartId(partId)
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partNames = validParts();
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ret = (~isempty(partId)) && (partId >= 1) && (partId <= numel(partNames));
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end
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function partId = promptPart()
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fprintf('== Select which part(s) to submit:\n', ...
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homework_id());
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partNames = validParts();
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srcFiles = sources();
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for i = 1:numel(partNames)
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fprintf('== %d) %s [', i, partNames{i});
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fprintf(' %s ', srcFiles{i}{:});
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fprintf(']\n');
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end
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fprintf('\nEnter your choice [1-%d]: ', ...
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numel(partNames));
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selPart = input('', 's');
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partId = str2num(selPart);
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if ~isValidPartId(partId)
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partId = -1;
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end
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end
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function [result, str] = submitSolution(email, part, output, source)
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result = ['a:5:{' ...
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p_s('homework') p_s64(homework_id()) ...
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p_s('part') p_s64(part) ...
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p_s('email') p_s64(email) ...
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p_s('output') p_s64(output) ...
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p_s('source') p_s64(source) ...
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'}'];
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end
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function s = p_s(str)
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s = ['s:' num2str(numel(str)) ':"' str '";'];
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end
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function s = p_s64(str)
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str = base64encode(str, '');
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s = ['s:' num2str(numel(str)) ':"' str '";'];
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end
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% =========================== LOGIN HELPERS ===========================
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function [login] = loginPrompt()
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% Prompt for password
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[login] = basicPrompt();
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end
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function [login] = basicPrompt()
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login = input('Login (Email address): ', 's');
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end
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% =========================== Base64 Encoder ============================
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% Thanks to Peter John Acklam
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%
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function y = base64encode(x, eol)
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%BASE64ENCODE Perform base64 encoding on a string.
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%
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% BASE64ENCODE(STR, EOL) encode the given string STR. EOL is the line ending
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% sequence to use; it is optional and defaults to '\n' (ASCII decimal 10).
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% The returned encoded string is broken into lines of no more than 76
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% characters each, and each line will end with EOL unless it is empty. Let
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% EOL be empty if you do not want the encoded string broken into lines.
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%
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% STR and EOL don't have to be strings (i.e., char arrays). The only
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% requirement is that they are vectors containing values in the range 0-255.
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%
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% This function may be used to encode strings into the Base64 encoding
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% specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions). The
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% Base64 encoding is designed to represent arbitrary sequences of octets in a
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% form that need not be humanly readable. A 65-character subset
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% ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per
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% printable character.
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%
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% Examples
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% --------
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%
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% If you want to encode a large file, you should encode it in chunks that are
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% a multiple of 57 bytes. This ensures that the base64 lines line up and
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% that you do not end up with padding in the middle. 57 bytes of data fills
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% one complete base64 line (76 == 57*4/3):
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%
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% If ifid and ofid are two file identifiers opened for reading and writing,
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% respectively, then you can base64 encode the data with
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%
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% while ~feof(ifid)
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% fwrite(ofid, base64encode(fread(ifid, 60*57)));
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% end
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%
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% or, if you have enough memory,
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%
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% fwrite(ofid, base64encode(fread(ifid)));
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%
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% See also BASE64DECODE.
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% Author: Peter John Acklam
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% Time-stamp: 2004-02-03 21:36:56 +0100
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% E-mail: pjacklam@online.no
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% URL: http://home.online.no/~pjacklam
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if isnumeric(x)
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x = num2str(x);
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end
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% make sure we have the EOL value
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if nargin < 2
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eol = sprintf('\n');
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else
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if sum(size(eol) > 1) > 1
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error('EOL must be a vector.');
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end
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if any(eol(:) > 255)
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error('EOL can not contain values larger than 255.');
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end
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end
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if sum(size(x) > 1) > 1
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error('STR must be a vector.');
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end
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x = uint8(x);
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eol = uint8(eol);
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ndbytes = length(x); % number of decoded bytes
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nchunks = ceil(ndbytes / 3); % number of chunks/groups
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nebytes = 4 * nchunks; % number of encoded bytes
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% add padding if necessary, to make the length of x a multiple of 3
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if rem(ndbytes, 3)
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x(end+1 : 3*nchunks) = 0;
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end
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x = reshape(x, [3, nchunks]); % reshape the data
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y = repmat(uint8(0), 4, nchunks); % for the encoded data
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Split up every 3 bytes into 4 pieces
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%
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% aaaaaabb bbbbcccc ccdddddd
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%
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% to form
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%
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% 00aaaaaa 00bbbbbb 00cccccc 00dddddd
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%
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y(1,:) = bitshift(x(1,:), -2); % 6 highest bits of x(1,:)
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y(2,:) = bitshift(bitand(x(1,:), 3), 4); % 2 lowest bits of x(1,:)
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y(2,:) = bitor(y(2,:), bitshift(x(2,:), -4)); % 4 highest bits of x(2,:)
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y(3,:) = bitshift(bitand(x(2,:), 15), 2); % 4 lowest bits of x(2,:)
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y(3,:) = bitor(y(3,:), bitshift(x(3,:), -6)); % 2 highest bits of x(3,:)
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y(4,:) = bitand(x(3,:), 63); % 6 lowest bits of x(3,:)
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Now perform the following mapping
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%
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% 0 - 25 -> A-Z
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% 26 - 51 -> a-z
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% 52 - 61 -> 0-9
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% 62 -> +
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% 63 -> /
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%
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% We could use a mapping vector like
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%
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% ['A':'Z', 'a':'z', '0':'9', '+/']
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%
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% but that would require an index vector of class double.
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%
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z = repmat(uint8(0), size(y));
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i = y <= 25; z(i) = 'A' + double(y(i));
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i = 26 <= y & y <= 51; z(i) = 'a' - 26 + double(y(i));
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i = 52 <= y & y <= 61; z(i) = '0' - 52 + double(y(i));
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i = y == 62; z(i) = '+';
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i = y == 63; z(i) = '/';
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y = z;
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Add padding if necessary.
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%
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npbytes = 3 * nchunks - ndbytes; % number of padding bytes
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if npbytes
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y(end-npbytes+1 : end) = '='; % '=' is used for padding
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end
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if isempty(eol)
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% reshape to a row vector
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y = reshape(y, [1, nebytes]);
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else
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nlines = ceil(nebytes / 76); % number of lines
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neolbytes = length(eol); % number of bytes in eol string
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% pad data so it becomes a multiple of 76 elements
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y = [y(:) ; zeros(76 * nlines - numel(y), 1)];
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y(nebytes + 1 : 76 * nlines) = 0;
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y = reshape(y, 76, nlines);
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% insert eol strings
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eol = eol(:);
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y(end + 1 : end + neolbytes, :) = eol(:, ones(1, nlines));
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% remove padding, but keep the last eol string
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m = nebytes + neolbytes * (nlines - 1);
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n = (76+neolbytes)*nlines - neolbytes;
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y(m+1 : n) = '';
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% extract and reshape to row vector
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y = reshape(y, 1, m+neolbytes);
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end
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% output is a character array
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y = char(y);
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end
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