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-rw-r--r--source/OSSupport/GZipFile.cpp107
1 files changed, 107 insertions, 0 deletions
diff --git a/source/OSSupport/GZipFile.cpp b/source/OSSupport/GZipFile.cpp
new file mode 100644
index 000000000..cbf6be6c4
--- /dev/null
+++ b/source/OSSupport/GZipFile.cpp
@@ -0,0 +1,107 @@
+
+// GZipFile.cpp
+
+// Implements the cGZipFile class representing a RAII wrapper over zlib's GZip file routines
+
+#include "Globals.h"
+#include "GZipFile.h"
+
+
+
+
+
+cGZipFile::cGZipFile(void) :
+ m_File(NULL)
+{
+}
+
+
+
+
+
+cGZipFile::~cGZipFile()
+{
+ Close();
+}
+
+
+
+
+
+bool cGZipFile::Open(const AString & a_FileName, eMode a_Mode)
+{
+ if (m_File != NULL)
+ {
+ ASSERT(!"A file is already open in this object");
+ return false;
+ }
+ m_File = gzopen(a_FileName.c_str(), (a_Mode == fmRead) ? "r" : "w");
+ m_Mode = a_Mode;
+ return (m_File != NULL);
+}
+
+
+
+
+
+void cGZipFile::Close(void)
+{
+ if (m_File != NULL)
+ {
+ gzclose(m_File);
+ m_File = NULL;
+ }
+}
+
+
+
+
+
+int cGZipFile::ReadRestOfFile(AString & a_Contents)
+{
+ if (m_File == NULL)
+ {
+ ASSERT(!"No file has been opened");
+ return -1;
+ }
+
+ if (m_Mode != fmRead)
+ {
+ ASSERT(!"Bad file mode, cannot read");
+ return -1;
+ }
+
+ // Since the gzip format doesn't really support getting the uncompressed length, we need to read incrementally. Yuck!
+ int NumBytesRead = 0;
+ char Buffer[64 KiB];
+ while ((NumBytesRead = gzread(m_File, Buffer, sizeof(Buffer))) > 0)
+ {
+ a_Contents.append(Buffer, NumBytesRead);
+ }
+ return NumBytesRead;
+}
+
+
+
+
+
+bool cGZipFile::Write(const char * a_Contents, int a_Size)
+{
+ if (m_File == NULL)
+ {
+ ASSERT(!"No file has been opened");
+ return false;
+ }
+
+ if (m_Mode != fmWrite)
+ {
+ ASSERT(!"Bad file mode, cannot write");
+ return false;
+ }
+
+ return (gzwrite(m_File, a_Contents, a_Size) != 0);
+}
+
+
+
+