113 lines
3.0 KiB
C#
113 lines
3.0 KiB
C#
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/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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using System;
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using System.IO;
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using System.Text;
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/*
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* A simple class for writing out bytes as hexadecimal constants or
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* explicit expressions for the initializer of a C array of 'unsigned
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* char'. It starts every line with a given number of tabs, and aims at
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* keeping lines below a given threshold (each indentation tab counts as
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* 8 characters). An explicit newline is inserted before the first
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* element, and commas are used as separators.
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*/
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class BlobWriter {
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TextWriter w;
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int maxLineLen;
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int indent;
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int lineLen;
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/*
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* Create a new instance. 'maxLineLen' is in characters, and
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* 'indent' is the number of tab characters at the start of
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* each line.
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*/
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internal BlobWriter(TextWriter w, int maxLineLen, int indent)
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{
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this.w = w;
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this.maxLineLen = maxLineLen;
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this.indent = indent;
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lineLen = -1;
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}
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void DoNL()
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{
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w.WriteLine();
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for (int i = 0; i < indent; i ++) {
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w.Write('\t');
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}
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lineLen = (indent << 3);
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}
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/*
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* Append a new byte value; it will be converted to an hexadecimal
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* constant in the output.
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*/
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internal void Append(byte b)
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{
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if (lineLen < 0) {
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DoNL();
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} else {
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w.Write(',');
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lineLen ++;
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if ((lineLen + 5) > maxLineLen) {
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DoNL();
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} else {
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w.Write(' ');
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lineLen ++;
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}
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}
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w.Write("0x{0:X2}", b);
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lineLen += 4;
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}
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/*
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* Append a C expression, which will be used as is. The expression
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* may resolve to several bytes if it uses internal commas. The
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* writer will try to honour the expected line length, but it
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* won't insert a newline character inside the expression.
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*/
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internal void Append(string expr)
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{
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if (lineLen < 0) {
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DoNL();
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} else {
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w.Write(',');
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lineLen ++;
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if ((lineLen + 1 + expr.Length) > maxLineLen) {
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DoNL();
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} else {
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w.Write(' ');
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lineLen ++;
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}
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}
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w.Write("{0}", expr);
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lineLen += expr.Length;
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}
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}
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