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Imputes the alignment requirement for CAS headers.

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Also stops adding a spurious 0xff as the final byte on the tape.
This commit is contained in:
Thomas Harte 2017-12-29 10:42:18 -05:00
parent c481293aca
commit 98a9d57c0b
1 changed files with 7 additions and 4 deletions
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11
Storage/Tape/Formats/CAS.cpp
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@ -41,15 +41,18 @@ CAS::CAS(const char *file_name) {
chunk.long_header = bytes_are_equal && ((lookahead[0] == 0xd3) || (lookahead[0] == 0xd0) || (lookahead[0] == 0xea));
chunk.has_gap = chunk.long_header && (chunks_.size() > 1);
// Keep going until another header arrives or the file ends.
while(std::memcmp(lookahead, header_signature, sizeof(header_signature)) && !file.eof()) {
// Keep going until another header arrives or the file ends. Headers require the magic byte sequence,
// and also must be eight-byte aligned within the file.
while( !file.eof() &&
(std::memcmp(lookahead, header_signature, sizeof(header_signature)) || ((file.tell()-10)&7))) {
chunk.data.push_back(lookahead[0]);
get_next(file, lookahead, 1);
}
// If the file ended, flush the lookahead.
// If the file ended, flush the lookahead. The final thing in it will be a 0xff from the read that
// triggered the eof, so don't include that.
if(file.eof()) {
for(std::size_t index = 0; index < sizeof(lookahead); index++)
for(std::size_t index = 0; index < sizeof(lookahead) - 1; index++)
chunk.data.push_back(lookahead[index]);
}
}