Why do I only get the first few lines of file when using GZipStream to decompress in dotnet core
I'm trying to read a series of gzip files using the code below.
What I end up with is a file that is only a fraction of the total file. Interestingly enough the text file output is almost perfectly truncated at a line break.
public static string UnzipFile(string filename)
{
FileInfo fi = new FileInfo(filename);
Console.WriteLine($" - - - - - UnzipFile {filename} {fi.Length} - - - - - ");
string newFileName = filename.Substring(0, filename.Length - 4);
try
{
byte buffer = new byte[4096]; // read in chunks of 4KB
using (FileStream fs2 = new FileStream(newFileName, FileMode.CreateNew))
{
using (FileStream fs = new FileStream(filename, FileMode.Open))
{
using (GZipStream zipStream = new GZipStream(fs, CompressionMode.Decompress))
{
zipStream.BufferSize = 1024;
int bytesRead;
while((bytesRead = zipStream.Read(buffer, 0, buffer.Length)) > 0)
{
Console.WriteLine($" {bytesRead} ");
fs2.Write(buffer, 0, bytesRead);
fs2.Flush(true);
}
}
}
}
FileInfo fi2 = new FileInfo(newFileName);
Console.WriteLine($" - - - - {newFileName} {fi2.Length}");
}
catch (Exception e)
{
Console.WriteLine($" - - - - - EXCEPTION {e.Message} {e.StackTrace}");
}
return newFileName;
}
Here is partial output from running the code:
UnzipFile : 177686_2018-10-18_0#289.json.gz 34975
4096
4096
855
177686_2018-10-18_0#289.json 9047
So it looks like a file of size 34975 bytes when compressed ends up decompressing only 9047 bytes. If I use gunzip on a mac to expand the file I get a file 223344 bytes in size.
Where have I gone wrong?
edit: Additional data
In case it helps, I get this when using GZip.Decompress
Bad CRC32 in GZIP trailer. (actual(7C64AEAA)!=expected(F641B726)) at Ionic.Zlib.ZlibBaseStream.finish()
Additional data when examining the position of the FileStream
fs pos: 2093 fs len: 33930
c# .net gzip sharpziplib
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
add a comment |
I'm trying to read a series of gzip files using the code below.
What I end up with is a file that is only a fraction of the total file. Interestingly enough the text file output is almost perfectly truncated at a line break.
public static string UnzipFile(string filename)
{
FileInfo fi = new FileInfo(filename);
Console.WriteLine($" - - - - - UnzipFile {filename} {fi.Length} - - - - - ");
string newFileName = filename.Substring(0, filename.Length - 4);
try
{
byte buffer = new byte[4096]; // read in chunks of 4KB
using (FileStream fs2 = new FileStream(newFileName, FileMode.CreateNew))
{
using (FileStream fs = new FileStream(filename, FileMode.Open))
{
using (GZipStream zipStream = new GZipStream(fs, CompressionMode.Decompress))
{
zipStream.BufferSize = 1024;
int bytesRead;
while((bytesRead = zipStream.Read(buffer, 0, buffer.Length)) > 0)
{
Console.WriteLine($" {bytesRead} ");
fs2.Write(buffer, 0, bytesRead);
fs2.Flush(true);
}
}
}
}
FileInfo fi2 = new FileInfo(newFileName);
Console.WriteLine($" - - - - {newFileName} {fi2.Length}");
}
catch (Exception e)
{
Console.WriteLine($" - - - - - EXCEPTION {e.Message} {e.StackTrace}");
}
return newFileName;
}
Here is partial output from running the code:
UnzipFile : 177686_2018-10-18_0#289.json.gz 34975
4096
4096
855
177686_2018-10-18_0#289.json 9047
So it looks like a file of size 34975 bytes when compressed ends up decompressing only 9047 bytes. If I use gunzip on a mac to expand the file I get a file 223344 bytes in size.
Where have I gone wrong?
edit: Additional data
In case it helps, I get this when using GZip.Decompress
Bad CRC32 in GZIP trailer. (actual(7C64AEAA)!=expected(F641B726)) at Ionic.Zlib.ZlibBaseStream.finish()
Additional data when examining the position of the FileStream
fs pos: 2093 fs len: 33930
c# .net gzip sharpziplib
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
By the way, streams have aCopyTomethod :)
– John
Nov 15 '18 at 2:03
Are you able to attach an example input to your code so people can test it?
– mjwills
Nov 15 '18 at 2:23
@mjwills I have proprietary data in the files so that's a blocker for me. I'll see if I can scrub some of it. If it helps, I get it from Amplitude's API amplitude.zendesk.com/hc/en-us/articles/…
– Zain Mecklai
Nov 15 '18 at 2:42
1
@John Thanks! I'll incorporate that! Appreciate the tip.
– Zain Mecklai
Nov 15 '18 at 2:42
add a comment |
I'm trying to read a series of gzip files using the code below.
What I end up with is a file that is only a fraction of the total file. Interestingly enough the text file output is almost perfectly truncated at a line break.
public static string UnzipFile(string filename)
{
FileInfo fi = new FileInfo(filename);
Console.WriteLine($" - - - - - UnzipFile {filename} {fi.Length} - - - - - ");
string newFileName = filename.Substring(0, filename.Length - 4);
try
{
byte buffer = new byte[4096]; // read in chunks of 4KB
using (FileStream fs2 = new FileStream(newFileName, FileMode.CreateNew))
{
using (FileStream fs = new FileStream(filename, FileMode.Open))
{
using (GZipStream zipStream = new GZipStream(fs, CompressionMode.Decompress))
{
zipStream.BufferSize = 1024;
int bytesRead;
while((bytesRead = zipStream.Read(buffer, 0, buffer.Length)) > 0)
{
Console.WriteLine($" {bytesRead} ");
fs2.Write(buffer, 0, bytesRead);
fs2.Flush(true);
}
}
}
}
FileInfo fi2 = new FileInfo(newFileName);
Console.WriteLine($" - - - - {newFileName} {fi2.Length}");
}
catch (Exception e)
{
Console.WriteLine($" - - - - - EXCEPTION {e.Message} {e.StackTrace}");
}
return newFileName;
}
Here is partial output from running the code:
UnzipFile : 177686_2018-10-18_0#289.json.gz 34975
4096
4096
855
177686_2018-10-18_0#289.json 9047
So it looks like a file of size 34975 bytes when compressed ends up decompressing only 9047 bytes. If I use gunzip on a mac to expand the file I get a file 223344 bytes in size.
Where have I gone wrong?
edit: Additional data
In case it helps, I get this when using GZip.Decompress
Bad CRC32 in GZIP trailer. (actual(7C64AEAA)!=expected(F641B726)) at Ionic.Zlib.ZlibBaseStream.finish()
Additional data when examining the position of the FileStream
fs pos: 2093 fs len: 33930
c# .net gzip sharpziplib
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
I'm trying to read a series of gzip files using the code below.
What I end up with is a file that is only a fraction of the total file. Interestingly enough the text file output is almost perfectly truncated at a line break.
public static string UnzipFile(string filename)
{
FileInfo fi = new FileInfo(filename);
Console.WriteLine($" - - - - - UnzipFile {filename} {fi.Length} - - - - - ");
string newFileName = filename.Substring(0, filename.Length - 4);
try
{
byte buffer = new byte[4096]; // read in chunks of 4KB
using (FileStream fs2 = new FileStream(newFileName, FileMode.CreateNew))
{
using (FileStream fs = new FileStream(filename, FileMode.Open))
{
using (GZipStream zipStream = new GZipStream(fs, CompressionMode.Decompress))
{
zipStream.BufferSize = 1024;
int bytesRead;
while((bytesRead = zipStream.Read(buffer, 0, buffer.Length)) > 0)
{
Console.WriteLine($" {bytesRead} ");
fs2.Write(buffer, 0, bytesRead);
fs2.Flush(true);
}
}
}
}
FileInfo fi2 = new FileInfo(newFileName);
Console.WriteLine($" - - - - {newFileName} {fi2.Length}");
}
catch (Exception e)
{
Console.WriteLine($" - - - - - EXCEPTION {e.Message} {e.StackTrace}");
}
return newFileName;
}
Here is partial output from running the code:
UnzipFile : 177686_2018-10-18_0#289.json.gz 34975
4096
4096
855
177686_2018-10-18_0#289.json 9047
So it looks like a file of size 34975 bytes when compressed ends up decompressing only 9047 bytes. If I use gunzip on a mac to expand the file I get a file 223344 bytes in size.
Where have I gone wrong?
edit: Additional data
In case it helps, I get this when using GZip.Decompress
Bad CRC32 in GZIP trailer. (actual(7C64AEAA)!=expected(F641B726)) at Ionic.Zlib.ZlibBaseStream.finish()
Additional data when examining the position of the FileStream
fs pos: 2093 fs len: 33930
c# .net gzip sharpziplib
c# .net gzip sharpziplib
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
edited Nov 15 '18 at 14:32
Zain Mecklai
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
asked Nov 15 '18 at 1:47
Zain MecklaiZain Mecklai
64
64
By the way, streams have aCopyTomethod :)
– John
Nov 15 '18 at 2:03
Are you able to attach an example input to your code so people can test it?
– mjwills
Nov 15 '18 at 2:23
@mjwills I have proprietary data in the files so that's a blocker for me. I'll see if I can scrub some of it. If it helps, I get it from Amplitude's API amplitude.zendesk.com/hc/en-us/articles/…
– Zain Mecklai
Nov 15 '18 at 2:42
1
@John Thanks! I'll incorporate that! Appreciate the tip.
– Zain Mecklai
Nov 15 '18 at 2:42
add a comment |
By the way, streams have aCopyTomethod :)
– John
Nov 15 '18 at 2:03
Are you able to attach an example input to your code so people can test it?
– mjwills
Nov 15 '18 at 2:23
@mjwills I have proprietary data in the files so that's a blocker for me. I'll see if I can scrub some of it. If it helps, I get it from Amplitude's API amplitude.zendesk.com/hc/en-us/articles/…
– Zain Mecklai
Nov 15 '18 at 2:42
1
@John Thanks! I'll incorporate that! Appreciate the tip.
– Zain Mecklai
Nov 15 '18 at 2:42
By the way, streams have a
CopyTo method :)– John
Nov 15 '18 at 2:03
By the way, streams have a
CopyTo method :)– John
Nov 15 '18 at 2:03
Are you able to attach an example input to your code so people can test it?
– mjwills
Nov 15 '18 at 2:23
Are you able to attach an example input to your code so people can test it?
– mjwills
Nov 15 '18 at 2:23
@mjwills I have proprietary data in the files so that's a blocker for me. I'll see if I can scrub some of it. If it helps, I get it from Amplitude's API amplitude.zendesk.com/hc/en-us/articles/…
– Zain Mecklai
Nov 15 '18 at 2:42
@mjwills I have proprietary data in the files so that's a blocker for me. I'll see if I can scrub some of it. If it helps, I get it from Amplitude's API amplitude.zendesk.com/hc/en-us/articles/…
– Zain Mecklai
Nov 15 '18 at 2:42
1
1
@John Thanks! I'll incorporate that! Appreciate the tip.
– Zain Mecklai
Nov 15 '18 at 2:42
@John Thanks! I'll incorporate that! Appreciate the tip.
– Zain Mecklai
Nov 15 '18 at 2:42
add a comment |
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By the way, streams have a
CopyTomethod :)– John
Nov 15 '18 at 2:03
Are you able to attach an example input to your code so people can test it?
– mjwills
Nov 15 '18 at 2:23
@mjwills I have proprietary data in the files so that's a blocker for me. I'll see if I can scrub some of it. If it helps, I get it from Amplitude's API amplitude.zendesk.com/hc/en-us/articles/…
– Zain Mecklai
Nov 15 '18 at 2:42
1
@John Thanks! I'll incorporate that! Appreciate the tip.
– Zain Mecklai
Nov 15 '18 at 2:42