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fix: update NlpCodec

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This commit is contained in:
yyc12345 2024-12-11 20:19:48 +08:00
parent 6193a2ede6
commit b71f6867c5
1 changed files with 43 additions and 36 deletions
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69
NlpCodec/NlpCodec.cpp
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@ -13,6 +13,8 @@
namespace NlpCodec {
#pragma region Help Structs and Functions
/// @brief NlpCodec universal exception.
/// @details Once this exception was thrown, it means that somethings went wrong.
/// and main function should catch it, output error message and exit program immediately.
@ -32,12 +34,29 @@ namespace NlpCodec {
static constexpr _TyTo SafeCast(_TyFrom value) {
if (!std::in_range<_TyTo>(value))
throw NlpException(
"Fail to cast integral number because given value is greater than container. "
"Fail to cast integral number because given value is greater than the type can hold. "
"This is usually caused by your input or output file is too long.");
return static_cast<_TyTo>(value);
}
#pragma region "Encryption Stuff" {
/// @brief The safe version of `std::ifstream::read`.
/// Throw exception if fail to read.
static void SafeRead(std::ifstream& fin, char* s, std::streamsize count) {
fin.read(s, count);
if (!fin.good() || fin.gcount() != count)
throw NlpException("Fail to read data from file.");
}
/// @brief The safe version of `std::ofstream::write`.
/// Throw exception if fail to write.
static void SafeWrite(std::ofstream& fout, const char* s, std::streamsize count) {
fout.write(s, count);
if (!fout.good())
throw NlpException("Fail to write data into file.");
}
#pragma endregion
#pragma region Encryption Stuff
/*
@ -155,7 +174,7 @@ namespace NlpCodec {
}
}
#pragma endregion }
#pragma endregion
/// @brief Get the length of given file stream.
static uint32_t GetFileLength(std::ifstream& fin) {
@ -195,9 +214,7 @@ namespace NlpCodec {
throw NlpException("Fail to allocate memory.");
// Read data from file to input buffer
fin.read(inbuf.get(), raw_size);
if (!fin.good() || fin.gcount() != raw_size)
throw NlpException("Fail to read file data into buffer.");
SafeRead(fin, inbuf.get(), raw_size);
// Do XOR operation
CircularXorOperation(inbuf.get(), raw_size);
@ -209,9 +226,9 @@ namespace NlpCodec {
reinterpret_cast<Bytef*>(inbuf.get()), static_cast<uLong>(raw_size),
Z_BEST_COMPRESSION
);
// Check ZLib result.
// Check zlib result.
if (ret != Z_OK)
throw NlpException("Zlib compress() failed.");
throw NlpException("zlib compress() failed.");
// Fetch final compressed size.
uint32_t compressed_size = SafeCast<uint32_t>(dest_len);
@ -219,21 +236,15 @@ namespace NlpCodec {
uint32_t checksum = static_cast<uint32_t>(adler32(0u, reinterpret_cast<Bytef*>(outbuf.get()), SafeCast<uInt>(compressed_size)));
// Write compressed data into file
fout.write(outbuf.get(), compressed_size);
if (!fout.good())
throw NlpException("Fail to write data into file.");
SafeWrite(fout, outbuf.get(), compressed_size);
// Raw size and checksum need some extra encryption before writting
raw_size = EncryptRawFileLength(raw_size);
checksum = EncryptChecksum(checksum);
// Write raw size and checksum
fout.write(reinterpret_cast<char*>(&raw_size), sizeof(uint32_t));
if (!fout.good())
throw NlpException("Fail to write raw size into file.");
fout.write(reinterpret_cast<char*>(&checksum), sizeof(uint32_t));
if (!fout.good())
throw NlpException("Fail to write checksum into file.");
SafeWrite(fout, reinterpret_cast<char*>(&raw_size), sizeof(uint32_t));
SafeWrite(fout, reinterpret_cast<char*>(&checksum), sizeof(uint32_t));
}
@ -247,8 +258,8 @@ namespace NlpCodec {
compressed_size -= TAIL_SIZE;
fin.seekg(compressed_size, std::ios_base::beg);
uint32_t expected_raw_size = 0u, expected_checksum = 0u;
fin.read(reinterpret_cast<char*>(&expected_raw_size), sizeof(uint32_t));
fin.read(reinterpret_cast<char*>(&expected_checksum), sizeof(uint32_t));
SafeRead(fin, reinterpret_cast<char*>(&expected_raw_size), sizeof(uint32_t));
SafeRead(fin, reinterpret_cast<char*>(&expected_checksum), sizeof(uint32_t));
fin.seekg(0, std::ios_base::beg);
// Raw size and checksum data need to do some extra decryption.
@ -262,9 +273,7 @@ namespace NlpCodec {
throw NlpException("Fail to allocate memory.");
// Read file into buffer
fin.read(inbuf.get(), compressed_size);
if (!fin.good() || fin.gcount() != compressed_size)
throw NlpException("Fail to read data into buffer.\n");
SafeRead(fin, inbuf.get(), compressed_size);
// Test checksum
uint32_t checksum = static_cast<uint32_t>(adler32(0u, reinterpret_cast<Bytef*>(inbuf.get()), SafeCast<uInt>(compressed_size)));
@ -281,15 +290,13 @@ namespace NlpCodec {
);
// Check zlib result
if (ret != Z_OK)
throw NlpException("Zlib uncompress() failed.");
throw NlpException("zlib uncompress() failed.");
// do xor operation
// Do XOR operation
CircularXorOperation(outbuf.get(), expected_raw_size);
// Write result into file
fout.write(outbuf.get(), expected_raw_size);
if (!fout.good())
throw NlpException("Fail to write data into file.");
SafeWrite(fout, outbuf.get(), expected_raw_size);
}
@ -321,11 +328,11 @@ namespace NlpCodec::Runtime {
<< "encode - encode text file into NLP file." << std::endl
<< "decode - decode NLP file into text file." << std::endl
<< "<src> - the source file." << std::endl
<< " the path to text file in encode mode." << std::endl
<< " the path to NLP file in decode mode." << std::endl
<< " encode mode: the path to text file." << std::endl
<< " decode mode: the path to NLP file." << std::endl
<< "<dest> - the destination file." << std::endl
<< " the path to NLP file in encode mode." << std::endl
<< " the path to text file in decode mode." << std::endl
<< " encode mode: the path to NLP file." << std::endl
<< " decode mode: the path to text file." << std::endl
<< "" << std::endl;
}