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cksum: Don't read the entire input file in memory

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Same as `checksum`, in some cases we just can't load whole file into
memory.
This commit is contained in:
LuK1337 2021-07-31 19:01:47 +02:00 • committed by Gunnar Beutner
parent dc80a258f6
commit c5df5e504c
1 changed files with 26 additions and 5 deletions
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31
Userland/Utilities/cksum.cpp
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@ -41,18 +41,39 @@ int main(int argc, char** argv)
bool fail = false; bool fail = false;
for (auto& path : paths) { for (auto& path : paths) {
auto file = Core::File::construct((StringView(path) == "-") ? "/dev/stdin" : path); auto filepath = (StringView(path) == "-") ? "/dev/stdin" : path;
auto file = Core::File::construct(filepath);
if (!file->open(Core::OpenMode::ReadOnly)) { if (!file->open(Core::OpenMode::ReadOnly)) {
warnln("{}: {}: {}", argv[0], path, file->error_string()); warnln("{}: {}: {}", argv[0], path, file->error_string());
fail = true; fail = true;
continue; continue;
} }
auto file_buffer = file->read_all(); struct stat st;
auto bytes = file_buffer.bytes().size(); if (fstat(file->fd(), &st) < 0) {
warnln("{}: Failed to fstat {}: {}", argv[0], filepath, strerror(errno));
fail = true;
continue;
}
if (algorithm == "crc32") { if (algorithm == "crc32") {
outln("{} {} {}", Crypto::Checksum::CRC32 { file_buffer.bytes() }.digest(), bytes, path); Crypto::Checksum::CRC32 crc32;
while (!file->eof() && !file->has_error())
crc32.update(file->read(PAGE_SIZE));
if (file->has_error()) {
warnln("Failed to read {}: {}", filepath, file->error_string());
fail = true;
continue;
}
outln("{} {} {}", crc32.digest(), st.st_size, path);
} else if (algorithm == "adler32") { } else if (algorithm == "adler32") {
outln("{} {} {}", Crypto::Checksum::Adler32 { file_buffer.bytes() }.digest(), bytes, path); Crypto::Checksum::Adler32 adler32;
while (!file->eof() && !file->has_error())
adler32.update(file->read(PAGE_SIZE));
if (file->has_error()) {
warnln("Failed to read {}: {}", filepath, file->error_string());
fail = true;
continue;
}
outln("{} {} {}", adler32.digest(), st.st_size, path);
} else { } else {
warnln("{}: Unknown checksum algorithm: {}", argv[0], algorithm); warnln("{}: Unknown checksum algorithm: {}", argv[0], algorithm);
exit(1); exit(1);