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CFileGZInputStream.cpp
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1 /* +------------------------------------------------------------------------+
2  | Mobile Robot Programming Toolkit (MRPT) |
3  | http://www.mrpt.org/ |
4  | |
5  | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file |
6  | See: http://www.mrpt.org/Authors - All rights reserved. |
7  | Released under BSD License. See details in http://www.mrpt.org/License |
8  +------------------------------------------------------------------------+ */
9 
10 #include "io-precomp.h" // Precompiled headers
11 
13 #include <mrpt/system/filesystem.h>
14 #include <mrpt/core/exceptions.h>
15 
16 #include <zlib.h>
17 
18 using namespace mrpt::io;
19 using namespace std;
20 
21 static_assert(
24  "Copy Check");
25 
26 #define THE_GZFILE reinterpret_cast<gzFile>(m_f)
27 
28 CFileGZInputStream::CFileGZInputStream(const string& fileName) : m_f(nullptr)
29 {
31  open(fileName);
32  MRPT_END
33 }
34 
37 {
39 
40  if (m_f) gzclose(THE_GZFILE);
41 
42  // Get compressed file size:
44  if (m_file_size == uint64_t(-1))
45  THROW_EXCEPTION_FMT("Couldn't access the file '%s'", fileName.c_str());
46 
47  // Open gz stream:
48  m_f = gzopen(fileName.c_str(), "rb");
49  return m_f != nullptr;
50 
51  MRPT_END
52 }
53 
55 {
56  if (m_f)
57  {
58  gzclose(THE_GZFILE);
59  m_f = nullptr;
60  }
61 }
62 
64 size_t CFileGZInputStream::Read(void* Buffer, size_t Count)
65 {
66  if (!m_f)
67  {
68  THROW_EXCEPTION("File is not open.");
69  }
70 
71  return gzread(THE_GZFILE, Buffer, Count);
72 }
73 
74 size_t CFileGZInputStream::Write(const void* Buffer, size_t Count)
75 {
76  MRPT_UNUSED_PARAM(Buffer);
77  MRPT_UNUSED_PARAM(Count);
78  THROW_EXCEPTION("Trying to write to an input file stream.");
79 }
80 
82 {
83  if (!m_f)
84  {
85  THROW_EXCEPTION("File is not open.");
86  }
87  return m_file_size;
88 }
89 
91 {
92  if (!m_f)
93  {
94  THROW_EXCEPTION("File is not open.");
95  }
96  return gztell(THE_GZFILE);
97 }
98 
99 bool CFileGZInputStream::fileOpenCorrectly() const { return m_f != nullptr; }
101 {
102  if (!m_f)
103  return true;
104  else
105  return 0 != gzeof(THE_GZFILE);
106 }
107 
109 {
110  THROW_EXCEPTION("Method not available in this class.");
111 }
TSeekOrigin
Used in CStream::Seek.
Definition: io/CStream.h:34
#define MRPT_START
Definition: exceptions.h:262
#define THROW_EXCEPTION(msg)
Definition: exceptions.h:41
uint64_t getPosition() const override
Method for getting the current cursor position in the compressed, where 0 is the first byte and Total...
size_t Write(const void *Buffer, size_t Count) override
Introduces a pure virtual method responsible for writing to the stream.
STL namespace.
size_t Read(void *Buffer, size_t Count) override
Introduces a pure virtual method responsible for reading from the stream.
bool fileOpenCorrectly() const
Returns true if the file was open without errors.
bool checkEOF()
Will be true if EOF has been already reached.
__int64 int64_t
Definition: rptypes.h:49
#define THE_GZFILE
uint64_t getTotalBytesCount() const override
Method for getting the total number of compressed bytes of in the file (the physical size of the comp...
GLsizei const GLchar ** string
Definition: glext.h:4101
bool open(const std::string &fileName)
Opens the file for read.
uint64_t Seek(int64_t, CStream::TSeekOrigin=sFromBeginning) override
This method is not implemented in this class.
uint64_t m_file_size
Compressed file size.
unsigned __int64 uint64_t
Definition: rptypes.h:50
void close()
Closes the file.
#define MRPT_END
Definition: exceptions.h:266
GLsizei const GLfloat * value
Definition: glext.h:4117
CFileGZInputStream()
Constructor without open.
uint64_t getFileSize(const std::string &fileName)
Return the size of the given file, or size_t(-1) if some error is found accessing that file...
Definition: filesystem.cpp:350
#define THROW_EXCEPTION_FMT(_FORMAT_STRING,...)
Definition: exceptions.h:43
#define MRPT_UNUSED_PARAM(a)
Determines whether this is an X86 or AMD64 platform.
Definition: common.h:186



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