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b8bdef0ad1
For non-encrypted files, determinstic ID generation uses file contents instead of timestamp and file name. At a small runtime cost, this enables generation of the same /ID if the same inputs are converted in the same way multiple times.
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
#include <qpdf/MD5.hh>
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#include <qpdf/Pl_MD5.hh>
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#include <qpdf/Pl_Discard.hh>
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#include <qpdf/QUtil.hh>
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#include <iostream>
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#include <stdio.h>
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static void test_string(char const* str)
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{
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MD5 a;
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a.encodeString(str);
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a.print();
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}
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int main(int, char*[])
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{
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test_string("");
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test_string("a");
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test_string("abc");
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test_string("message digest");
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test_string("abcdefghijklmnopqrstuvwxyz");
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test_string("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghi"
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"jklmnopqrstuvwxyz0123456789");
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test_string("1234567890123456789012345678901234567890"
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"1234567890123456789012345678901234567890");
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MD5 a;
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a.encodeFile("md5.in");
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std::cout << a.unparse() << std::endl;
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MD5 b;
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b.encodeFile("md5.in", 100);
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std::cout << b.unparse() << std::endl;
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std::cout
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<< MD5::checkDataChecksum("900150983cd24fb0d6963f7d28e17f72", "abc", 3)
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<< std::endl
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<< MD5::checkFileChecksum("5f4b4321873433daae578f85c72f9e74", "md5.in")
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<< std::endl
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<< MD5::checkFileChecksum("6f4b4321873433daae578f85c72f9e74", "md5.in")
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<< std::endl
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<< MD5::checkDataChecksum("000150983cd24fb0d6963f7d28e17f72", "abc", 3)
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<< std::endl
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<< MD5::checkFileChecksum("6f4b4321873433daae578f85c72f9e74", "glerbl")
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<< std::endl;
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Pl_Discard d;
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Pl_MD5 p("MD5", &d);
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// Create a second pipeline, protect against finish, and call
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// getHexDigest only once at the end of both passes. Make sure the
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// checksum is that of the input file concatenated to itself. This
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// will require changes to Pl_MD5.cc to prevent finish from
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// calling finalize.
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Pl_MD5 p2("MD5", &d);
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p2.persistAcrossFinish(true);
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for (int i = 0; i < 2; ++i)
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{
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FILE* f = QUtil::safe_fopen("md5.in", "rb");
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// buffer size < size of md5.in
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unsigned char buf[50];
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bool done = false;
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while (! done)
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{
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size_t len = fread(buf, 1, sizeof(buf), f);
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if (len <= 0)
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{
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done = true;
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}
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else
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{
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p.write(buf, len);
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p2.write(buf, len);
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if (i == 1)
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{
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// Partial digest -- resets after each call to write
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std::cout << p.getHexDigest() << std::endl;
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}
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}
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}
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fclose(f);
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p.finish();
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p2.finish();
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// Make sure calling getHexDigest twice with no intervening
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// writes results in the same result each time.
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std::cout << p.getHexDigest() << std::endl;
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std::cout << p.getHexDigest() << std::endl;
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}
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std::cout << p2.getHexDigest() << std::endl;
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return 0;
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}
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