test_cmp empty actual
'
+test_expect_success 'preimage view: right endpoint cannot backtrack' '
+ printf "SVNQ%b%b" "Q\003QQQ" "Q\002QQQ" |
+ q_to_nul >clear.backtrack &&
+ test_must_fail test-svn-fe -d preimage clear.backtrack 14
+'
+
+test_expect_success 'preimage view: left endpoint can advance' '
+ printf "SVNQ%b%b" "Q\003QQQ" "\001\002QQQ" |
+ q_to_nul >clear.preshrink &&
+ printf "SVNQ%b%b" "Q\003QQQ" "\001\001QQQ" |
+ q_to_nul >clear.shrinkbacktrack &&
+ test-svn-fe -d preimage clear.preshrink 14 >actual &&
+ test_must_fail test-svn-fe -d preimage clear.shrinkbacktrack 14 &&
+ test_cmp empty actual
+'
+
+test_expect_success 'preimage view: offsets compared by value' '
+ printf "SVNQ%b%b" "\001\001QQQ" "\0200Q\003QQQ" |
+ q_to_nul >clear.noisybacktrack &&
+ printf "SVNQ%b%b" "\001\001QQQ" "\0200\001\002QQQ" |
+ q_to_nul >clear.noisyadvance &&
+ test_must_fail test-svn-fe -d preimage clear.noisybacktrack 15 &&
+ test-svn-fe -d preimage clear.noisyadvance 15 &&
+ test_cmp empty actual
+'
+
+test_expect_success 'preimage view: reject truncated preimage' '
+ printf "SVNQ%b" "\010QQQQ" | q_to_nul >clear.lateemptyread &&
+ printf "SVNQ%b" "\010\001QQQ" | q_to_nul >clear.latenonemptyread &&
+ printf "SVNQ%b" "\001\010QQQ" | q_to_nul >clear.longread &&
+ test_must_fail test-svn-fe -d preimage clear.lateemptyread 9 &&
+ test_must_fail test-svn-fe -d preimage clear.latenonemptyread 9 &&
+ test_must_fail test-svn-fe -d preimage clear.longread 9
+'
+
+test_expect_success 'forbid unconsumed inline data' '
+ printf "SVNQ%b%s%b%s" "QQQQ\003" "bar" "QQQQ\001" "x" |
+ q_to_nul >inline.clear &&
+ test_must_fail test-svn-fe -d preimage inline.clear 18 >actual
+'
+
+test_expect_success 'reject truncated inline data' '
+ printf "SVNQ%b%s" "QQQQ\003" "b" | q_to_nul >inline.trunc &&
+ test_must_fail test-svn-fe -d preimage inline.trunc 10
+'
+
+test_expect_success 'reject truncated inline data (after instruction section)' '
+ printf "SVNQ%b%b%s" "QQ\001\001\003" "\0201" "b" | q_to_nul >insn.trunc &&
+ test_must_fail test-svn-fe -d preimage insn.trunc 11
+'
+
+test_expect_success 'copyfrom_data' '
+ echo hi >expect &&
+ printf "SVNQ%b%b%b" "QQ\003\001\003" "\0203" "hi\n" | q_to_nul >copydat &&
+ test-svn-fe -d preimage copydat 13 >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'multiple copyfrom_data' '
+ echo hi >expect &&
+ printf "SVNQ%b%b%b%b%b" "QQ\003\002\003" "\0201\0202" "hi\n" \
+ "QQQ\002Q" "\0200Q" | q_to_nul >copy.multi &&
+ len=$(wc -c <copy.multi) &&
+ test-svn-fe -d preimage copy.multi $len >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'incomplete multiple insn' '
+ printf "SVNQ%b%b%b" "QQ\003\002\003" "\0203\0200" "hi\n" |
+ q_to_nul >copy.partial &&
+ len=$(wc -c <copy.partial) &&
+ test_must_fail test-svn-fe -d preimage copy.partial $len
+'
+
+test_expect_success 'catch attempt to copy missing data' '
+ printf "SVNQ%b%b%s%b%s" "QQ\002\002\001" "\0201\0201" "X" \
+ "QQQQ\002" "YZ" |
+ q_to_nul >copy.incomplete &&
+ len=$(wc -c <copy.incomplete) &&
+ test_must_fail test-svn-fe -d preimage copy.incomplete $len
+'
+
+test_expect_success 'copyfrom target to repeat data' '
+ printf foofoo >expect &&
+ printf "SVNQ%b%b%s" "QQ\006\004\003" "\0203\0100\003Q" "foo" |
+ q_to_nul >copytarget.repeat &&
+ len=$(wc -c <copytarget.repeat) &&
+ test-svn-fe -d preimage copytarget.repeat $len >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'copyfrom target out of order' '
+ printf foooof >expect &&
+ printf "SVNQ%b%b%s" \
+ "QQ\006\007\003" "\0203\0101\002\0101\001\0101Q" "foo" |
+ q_to_nul >copytarget.reverse &&
+ len=$(wc -c <copytarget.reverse) &&
+ test-svn-fe -d preimage copytarget.reverse $len >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'catch copyfrom future' '
+ printf "SVNQ%b%b%s" "QQ\004\004\003" "\0202\0101\002\0201" "XYZ" |
+ q_to_nul >copytarget.infuture &&
+ len=$(wc -c <copytarget.infuture) &&
+ test_must_fail test-svn-fe -d preimage copytarget.infuture $len
+'
+
+test_expect_success 'copy to sustain' '
+ printf XYXYXYXYXYXZ >expect &&
+ printf "SVNQ%b%b%s" "QQ\014\004\003" "\0202\0111Q\0201" "XYZ" |
+ q_to_nul >copytarget.sustain &&
+ len=$(wc -c <copytarget.sustain) &&
+ test-svn-fe -d preimage copytarget.sustain $len >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'catch copy that overflows' '
+ printf "SVNQ%b%b%s" "QQ\003\003\001" "\0201\0177Q" X |
+ q_to_nul >copytarget.overflow &&
+ len=$(wc -c <copytarget.overflow) &&
+ test_must_fail test-svn-fe -d preimage copytarget.overflow $len
+'
+
+test_expect_success 'copyfrom source' '
+ printf foo >expect &&
+ printf "SVNQ%b%b" "Q\003\003\002Q" "\003Q" | q_to_nul >copysource.all &&
+ test-svn-fe -d preimage copysource.all 11 >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'copy backwards' '
+ printf oof >expect &&
+ printf "SVNQ%b%b" "Q\003\003\006Q" "\001\002\001\001\001Q" |
+ q_to_nul >copysource.rev &&
+ test-svn-fe -d preimage copysource.rev 15 >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'offsets are relative to window' '
+ printf fo >expect &&
+ printf "SVNQ%b%b%b%b" "Q\003\001\002Q" "\001Q" \
+ "\002\001\001\002Q" "\001Q" |
+ q_to_nul >copysource.two &&
+ test-svn-fe -d preimage copysource.two 18 >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'example from notes/svndiff' '
+ printf aaaaccccdddddddd >expect &&
+ printf aaaabbbbcccc >source &&
+ printf "SVNQ%b%b%s" "Q\014\020\007\001" \
+ "\004Q\004\010\0201\0107\010" d |
+ q_to_nul >delta.example &&
+ len=$(wc -c <delta.example) &&
+ test-svn-fe -d source delta.example $len >actual &&
+ test_cmp expect actual
+'
+
test_done