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py_ext/py_ext_xsd.xsd
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Sun, 06 Jan 2019 01:22:46 +0300
changeset 2499 68f4f2d4516b
parent 1315 ff14a66bbd12
permissions -rw-r--r--
use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

This code could be possible reused on low-end targets with limited RAM.

code to generate lookup table:
[---------------------------------------------------------------------]

/* CRC lookup table and initial state. */
uint32_t crc32_table[256];

/* Generate CRC32 lookup table. */
void GenerateCRC32Table(void)
{
unsigned int i, j;
/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected). */
uint32_t poly = 0xEDB88320;

for (i = 0; i <= 0xFF; i++)
{
uint32_t c = i;
for (j = 0 ; j < 8 ; j++)
c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1);
crc32_table[i] = c;
}
}

void main(void)
{
GenerateCRC32Table();
int j=0;
for(int i=0; i<256; i++) {
printf("0x%08X, ", crc32_table[i]);
if (++j >= 8) {
j = 0;
printf("\n");
}
}
}
[---------------------------------------------------------------------]
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<?xml version="1.0" encoding="ISO-8859-1" ?>
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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
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            xmlns:xhtml="http://www.w3.org/1999/xhtml">
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  <xsd:element name="Python">
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    <xsd:complexType>
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      <xsd:annotation>
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        <xsd:documentation>Formatted text according to parts of XHTML 1.1</xsd:documentation>
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      </xsd:annotation>
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      <xsd:sequence>
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        <xsd:any namespace="http://www.w3.org/1999/xhtml" processContents="lax"/>
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      </xsd:sequence>
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    </xsd:complexType>
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  </xsd:element>
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</xsd:schema>
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