diff options
| author | Jeffrey Walton <noloader@gmail.com> | 2015-11-05 01:59:46 -0500 |
|---|---|---|
| committer | Jeffrey Walton <noloader@gmail.com> | 2015-11-05 01:59:46 -0500 |
| commit | 48809d4e85c125814425c621d8d0d89f95405924 (patch) | |
| tree | 1010fd16c4b1199f3d27dd726dda241a2bd29f83 /gzip.cpp | |
| parent | 025337a94aceb75d188149db70c2094673772816 (diff) | |
| download | cryptopp-git-48809d4e85c125814425c621d8d0d89f95405924.tar.gz | |
CRYPTOPP 5.6.3 RC6 checkin
Diffstat (limited to 'gzip.cpp')
| -rw-r--r-- | gzip.cpp | 198 |
1 files changed, 99 insertions, 99 deletions
@@ -1,99 +1,99 @@ -// gzip.cpp - written and placed in the public domain by Wei Dai - -#include "pch.h" -#include "gzip.h" - -NAMESPACE_BEGIN(CryptoPP) - -void Gzip::WritePrestreamHeader() -{ - m_totalLen = 0; - m_crc.Restart(); - - AttachedTransformation()->Put(MAGIC1); - AttachedTransformation()->Put(MAGIC2); - AttachedTransformation()->Put(DEFLATED); - AttachedTransformation()->Put(0); // general flag - AttachedTransformation()->PutWord32(0); // time stamp - byte extra = (GetDeflateLevel() == 1) ? FAST : ((GetDeflateLevel() == 9) ? SLOW : 0); - AttachedTransformation()->Put(extra); - AttachedTransformation()->Put(GZIP_OS_CODE); -} - -void Gzip::ProcessUncompressedData(const byte *inString, size_t length) -{ - m_crc.Update(inString, length); - m_totalLen += (word32)length; -} - -void Gzip::WritePoststreamTail() -{ - SecByteBlock crc(4); - m_crc.Final(crc); - AttachedTransformation()->Put(crc, 4); - AttachedTransformation()->PutWord32(m_totalLen, LITTLE_ENDIAN_ORDER); -} - -// ************************************************************* - -Gunzip::Gunzip(BufferedTransformation *attachment, bool repeat, int propagation) - : Inflator(attachment, repeat, propagation) -{ -} - -void Gunzip::ProcessPrestreamHeader() -{ - m_length = 0; - m_crc.Restart(); - - byte buf[6]; - byte b, flags; - - if (m_inQueue.Get(buf, 2)!=2) throw HeaderErr(); - if (buf[0] != MAGIC1 || buf[1] != MAGIC2) throw HeaderErr(); - if (!m_inQueue.Skip(1)) throw HeaderErr(); // skip extra flags - if (!m_inQueue.Get(flags)) throw HeaderErr(); - if (flags & (ENCRYPTED | CONTINUED)) throw HeaderErr(); - if (m_inQueue.Skip(6)!=6) throw HeaderErr(); // Skip file time, extra flags and OS type - - if (flags & EXTRA_FIELDS) // skip extra fields - { - word16 length; - if (m_inQueue.GetWord16(length, LITTLE_ENDIAN_ORDER) != 2) throw HeaderErr(); - if (m_inQueue.Skip(length)!=length) throw HeaderErr(); - } - - if (flags & FILENAME) // skip filename - do - if (!m_inQueue.Get(b)) throw HeaderErr(); - while (b); - - if (flags & COMMENTS) // skip comments - do - if (!m_inQueue.Get(b)) throw HeaderErr(); - while (b); -} - -void Gunzip::ProcessDecompressedData(const byte *inString, size_t length) -{ - AttachedTransformation()->Put(inString, length); - m_crc.Update(inString, length); - m_length += (word32)length; -} - -void Gunzip::ProcessPoststreamTail() -{ - SecByteBlock crc(4); - if (m_inQueue.Get(crc, 4) != 4) - throw TailErr(); - if (!m_crc.Verify(crc)) - throw CrcErr(); - - word32 lengthCheck; - if (m_inQueue.GetWord32(lengthCheck, LITTLE_ENDIAN_ORDER) != 4) - throw TailErr(); - if (lengthCheck != m_length) - throw LengthErr(); -} - -NAMESPACE_END +// gzip.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "gzip.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void Gzip::WritePrestreamHeader()
+{
+ m_totalLen = 0;
+ m_crc.Restart();
+
+ AttachedTransformation()->Put(MAGIC1);
+ AttachedTransformation()->Put(MAGIC2);
+ AttachedTransformation()->Put(DEFLATED);
+ AttachedTransformation()->Put(0); // general flag
+ AttachedTransformation()->PutWord32(0); // time stamp
+ byte extra = byte((GetDeflateLevel() == 1) ? FAST : ((GetDeflateLevel() == 9) ? SLOW : 0));
+ AttachedTransformation()->Put(extra);
+ AttachedTransformation()->Put(GZIP_OS_CODE);
+}
+
+void Gzip::ProcessUncompressedData(const byte *inString, size_t length)
+{
+ m_crc.Update(inString, length);
+ m_totalLen += (word32)length;
+}
+
+void Gzip::WritePoststreamTail()
+{
+ SecByteBlock crc(4);
+ m_crc.Final(crc);
+ AttachedTransformation()->Put(crc, 4);
+ AttachedTransformation()->PutWord32(m_totalLen, LITTLE_ENDIAN_ORDER);
+}
+
+// *************************************************************
+
+Gunzip::Gunzip(BufferedTransformation *attachment, bool repeat, int propagation)
+ : Inflator(attachment, repeat, propagation)
+{
+}
+
+void Gunzip::ProcessPrestreamHeader()
+{
+ m_length = 0;
+ m_crc.Restart();
+
+ byte buf[6];
+ byte b, flags;
+
+ if (m_inQueue.Get(buf, 2)!=2) throw HeaderErr();
+ if (buf[0] != MAGIC1 || buf[1] != MAGIC2) throw HeaderErr();
+ if (!m_inQueue.Skip(1)) throw HeaderErr(); // skip extra flags
+ if (!m_inQueue.Get(flags)) throw HeaderErr();
+ if (flags & (ENCRYPTED | CONTINUED)) throw HeaderErr();
+ if (m_inQueue.Skip(6)!=6) throw HeaderErr(); // Skip file time, extra flags and OS type
+
+ if (flags & EXTRA_FIELDS) // skip extra fields
+ {
+ word16 length;
+ if (m_inQueue.GetWord16(length, LITTLE_ENDIAN_ORDER) != 2) throw HeaderErr();
+ if (m_inQueue.Skip(length)!=length) throw HeaderErr();
+ }
+
+ if (flags & FILENAME) // skip filename
+ do
+ if(!m_inQueue.Get(b)) throw HeaderErr();
+ while (b);
+
+ if (flags & COMMENTS) // skip comments
+ do
+ if(!m_inQueue.Get(b)) throw HeaderErr();
+ while (b);
+}
+
+void Gunzip::ProcessDecompressedData(const byte *inString, size_t length)
+{
+ AttachedTransformation()->Put(inString, length);
+ m_crc.Update(inString, length);
+ m_length += (word32)length;
+}
+
+void Gunzip::ProcessPoststreamTail()
+{
+ SecByteBlock crc(4);
+ if (m_inQueue.Get(crc, 4) != 4)
+ throw TailErr();
+ if (!m_crc.Verify(crc))
+ throw CrcErr();
+
+ word32 lengthCheck;
+ if (m_inQueue.GetWord32(lengthCheck, LITTLE_ENDIAN_ORDER) != 4)
+ throw TailErr();
+ if (lengthCheck != m_length)
+ throw LengthErr();
+}
+
+NAMESPACE_END
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