Fixes in 1998 html files
This includes some notices to those who wish for a greater challenge. In the 1998/schweikh3 the man page (and its copy to demonstrate the entry) have been updated slightly but only in comment (move 'or' from the command suggested to render it in text to its own line before the next command also in comment). The bugs file was updated for an entry or two.
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@@ -13,14 +13,18 @@
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where:
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```
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filename : file to calculate the CRC of
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bitwidth : width of the CRC in bits (decimal)
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polynom : polynomial used for the CRC (hexadecimal)
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reflected : 0 if the CRC is not reflected, 1 if it is
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init : initial value for the CRC (hexadecimal)
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xor : value to xor the final CRC with (hexadecimal)
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```
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- `filename`
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* file to calculate the CRC of
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- `bitwidth`
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* width of the CRC in bits (decimal)
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- `polynom`
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* polynomial used for the CRC (hexadecimal)
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- `reflected`
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* 0 if the CRC is not reflected, 1 if it is
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- `init`
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* initial value for the CRC (hexadecimal)
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- `xor`
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* value to xor the final CRC with (hexadecimal)
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## Try:
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@@ -39,18 +43,28 @@ archiver that uses the CRC-32 algorithm.
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## Author's remarks:
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```
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Usage:
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./tomtorfs filename bitwidth polynom reflected init xor
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Usage:
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filename : file to calculate the CRC of
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bitwidth : width of the CRC in bits (decimal)
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polynom : polynomial used for the CRC (hexadecimal)
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reflected : 0 if the CRC is not reflected, 1 if it is
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init : initial value for the CRC (hexadecimal)
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xor : value to xor the final CRC with (hexadecimal)
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``` <!---sh-->
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./tomtorfs filename bitwidth polynom reflected init xor
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```
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where:
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- `filename`
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* file to calculate the CRC of
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- `bitwidth`
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* width of the CRC in bits (decimal)
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- `polynom`
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* polynomial used for the CRC (hexadecimal)
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- `reflected`
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* 0 if the CRC is not reflected, 1 if it is
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- `init`
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* initial value for the CRC (hexadecimal)
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- `xor`
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* value to xor the final CRC with (hexadecimal)
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### Examples
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@@ -116,24 +130,34 @@ readable.
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The variable names are not very descriptive. They have the
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following meanings:
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```
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a = argc
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A = argv
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- `a`
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* argc
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- `A`
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* argv
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- `b`
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* array of `unsigned long` variables:
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- `b[0]`
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* bit-width of the CRC (`argv[2]`)
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* `b[1]`
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- CRC polynomial (`argv[3]`)
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* `b[2]`
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- nonzero if CRC is reflected (argv[4])
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* `b[3]`
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- initial value of CRC (argv[5])
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* `b[4]`
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- value final CRC is XORed with (argv[6])
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* `b[5]`
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- CRC value
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* `b[6]`
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- byte from file
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* `b[7]`
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- counter
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b = array of unsigned long variables
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b[0] = bit-width of the CRC (argv[2])
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b[1] = CRC polynomial (argv[3])
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b[2] = nonzero if CRC is reflected (argv[4])
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b[3] = initial value of CRC (argv[5])
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b[4] = value final CRC is XORed with (argv[6])
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b[5] = CRC value
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b[6] = byte from file
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b[7] = counter
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- `B`
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* `FILE *` through which the file `argv[1]` is opened
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B = FILE * through which the file argv[1] is opened
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C = typedef for unsigned long
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```
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- `C`
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- `typedef` for `unsigned long`
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The first `for` loop simply reads the command-line arguments
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in the `b[]` array. The third parameter to `strtoul(3)` causes
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+109
-31
@@ -412,12 +412,32 @@ Location: <a href="../../location.html#BE">BE</a> - <em>Kingdom of Belgium</em>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./tomtorfs filename bitwidth polynom reflected init xor</code></pre>
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<p>where:</p>
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<pre><code> filename : file to calculate the CRC of
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bitwidth : width of the CRC in bits (decimal)
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polynom : polynomial used for the CRC (hexadecimal)
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reflected : 0 if the CRC is not reflected, 1 if it is
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init : initial value for the CRC (hexadecimal)
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xor : value to xor the final CRC with (hexadecimal)</code></pre>
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<ul>
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<li><code>filename</code>
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<ul>
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<li>file to calculate the CRC of</li>
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</ul></li>
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<li><code>bitwidth</code>
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<ul>
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<li>width of the CRC in bits (decimal)</li>
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</ul></li>
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<li><code>polynom</code>
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<ul>
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<li>polynomial used for the CRC (hexadecimal)</li>
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</ul></li>
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<li><code>reflected</code>
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<ul>
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<li>0 if the CRC is not reflected, 1 if it is</li>
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</ul></li>
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<li><code>init</code>
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<ul>
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<li>initial value for the CRC (hexadecimal)</li>
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</ul></li>
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<li><code>xor</code>
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<ul>
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<li>value to xor the final CRC with (hexadecimal)</li>
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</ul></li>
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</ul>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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@@ -425,15 +445,35 @@ Location: <a href="../../location.html#BE">BE</a> - <em>Kingdom of Belgium</em>
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of the program with the value of CRCs computed by PKZIP or any other
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archiver that uses the CRC-32 algorithm.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<pre><code> Usage:
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./tomtorfs filename bitwidth polynom reflected init xor
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filename : file to calculate the CRC of
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bitwidth : width of the CRC in bits (decimal)
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polynom : polynomial used for the CRC (hexadecimal)
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reflected : 0 if the CRC is not reflected, 1 if it is
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init : initial value for the CRC (hexadecimal)
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xor : value to xor the final CRC with (hexadecimal)</code></pre>
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<p>Usage:</p>
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<pre><code> ./tomtorfs filename bitwidth polynom reflected init xor</code></pre>
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<p>where:</p>
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<ul>
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<li><code>filename</code>
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<ul>
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<li>file to calculate the CRC of</li>
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</ul></li>
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<li><code>bitwidth</code>
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<ul>
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<li>width of the CRC in bits (decimal)</li>
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</ul></li>
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<li><code>polynom</code>
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<ul>
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<li>polynomial used for the CRC (hexadecimal)</li>
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</ul></li>
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<li><code>reflected</code>
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<ul>
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<li>0 if the CRC is not reflected, 1 if it is</li>
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</ul></li>
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<li><code>init</code>
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<ul>
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<li>initial value for the CRC (hexadecimal)</li>
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</ul></li>
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<li><code>xor</code>
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<ul>
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<li>value to xor the final CRC with (hexadecimal)</li>
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</ul></li>
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</ul>
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<h3 id="examples">Examples</h3>
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<h4 id="crc-16">CRC-16:</h4>
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<pre><code> ./tomtorfs filename 16 1021 0 FFFF 0000</code></pre>
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@@ -461,22 +501,60 @@ the nice code shape I worked so hard on ;-) ) the code will become a bit more
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readable.</p>
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<p>The variable names are not very descriptive. They have the
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following meanings:</p>
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<pre><code> a = argc
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A = argv
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b = array of unsigned long variables
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b[0] = bit-width of the CRC (argv[2])
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b[1] = CRC polynomial (argv[3])
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b[2] = nonzero if CRC is reflected (argv[4])
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b[3] = initial value of CRC (argv[5])
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b[4] = value final CRC is XORed with (argv[6])
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b[5] = CRC value
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b[6] = byte from file
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b[7] = counter
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B = FILE * through which the file argv[1] is opened
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C = typedef for unsigned long</code></pre>
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<ul>
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<li><code>a</code>
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<ul>
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<li>argc</li>
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</ul></li>
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<li><code>A</code>
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<ul>
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<li>argv</li>
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</ul></li>
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<li><code>b</code>
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<ul>
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<li>array of <code>unsigned long</code> variables:</li>
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<li><code>b[0]</code>
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<ul>
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<li>bit-width of the CRC (<code>argv[2]</code>)</li>
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</ul></li>
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<li><code>b[1]</code>
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<ul>
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<li>CRC polynomial (<code>argv[3]</code>)</li>
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</ul></li>
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<li><code>b[2]</code>
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<ul>
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<li>nonzero if CRC is reflected (argv[4])</li>
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</ul></li>
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<li><code>b[3]</code>
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<ul>
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<li>initial value of CRC (argv[5])</li>
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</ul></li>
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<li><code>b[4]</code>
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<ul>
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<li>value final CRC is XORed with (argv[6])</li>
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</ul></li>
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<li><code>b[5]</code>
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<ul>
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<li>CRC value</li>
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</ul></li>
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<li><code>b[6]</code>
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<ul>
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<li>byte from file</li>
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</ul></li>
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<li><code>b[7]</code>
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<ul>
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<li>counter</li>
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</ul></li>
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</ul></li>
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<li><code>B</code>
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<ul>
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<li><code>FILE *</code> through which the file <code>argv[1]</code> is opened</li>
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</ul></li>
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<li><code>C</code>
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<ul>
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<li><code>typedef</code> for <code>unsigned long</code></li>
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</ul></li>
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</ul>
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<p>The first <code>for</code> loop simply reads the command-line arguments
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in the <code>b[]</code> array. The third parameter to <code>strtoul(3)</code> causes
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all arguments to be in base-16 (hex) except the first one,
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