diff options
Diffstat (limited to 'archive/hge/CxImage/xmemfile.cpp')
| -rw-r--r-- | archive/hge/CxImage/xmemfile.cpp | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/archive/hge/CxImage/xmemfile.cpp b/archive/hge/CxImage/xmemfile.cpp new file mode 100644 index 0000000..f235899 --- /dev/null +++ b/archive/hge/CxImage/xmemfile.cpp @@ -0,0 +1,213 @@ +#include "xmemfile.h"
+
+//////////////////////////////////////////////////////////
+CxMemFile::CxMemFile(uint8_t* pBuffer, uint32_t size)
+{
+ m_pBuffer = pBuffer;
+ m_Position = 0;
+ m_Size = m_Edge = size;
+ m_bFreeOnClose = (bool)(pBuffer==0);
+ m_bEOF = false;
+}
+//////////////////////////////////////////////////////////
+CxMemFile::~CxMemFile()
+{
+ Close();
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::Close()
+{
+ if ( (m_pBuffer) && (m_bFreeOnClose) ){
+ free(m_pBuffer);
+ m_pBuffer = NULL;
+ m_Size = 0;
+ }
+ return true;
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::Open()
+{
+ if (m_pBuffer) return false; // Can't re-open without closing first
+
+ m_Position = m_Size = m_Edge = 0;
+ m_pBuffer=(uint8_t*)malloc(1);
+ m_bFreeOnClose = true;
+
+ return (m_pBuffer!=0);
+}
+//////////////////////////////////////////////////////////
+uint8_t* CxMemFile::GetBuffer(bool bDetachBuffer)
+{
+ //can only detach, avoid inadvertantly attaching to
+ // memory that may not be ours [Jason De Arte]
+ if( bDetachBuffer )
+ m_bFreeOnClose = false;
+ return m_pBuffer;
+}
+//////////////////////////////////////////////////////////
+size_t CxMemFile::Read(void *buffer, size_t size, size_t count)
+{
+ if (buffer==NULL) return 0;
+
+ if (m_pBuffer==NULL) return 0;
+ if (m_Position >= (int32_t)m_Size){
+ m_bEOF = true;
+ return 0;
+ }
+
+ int32_t nCount = (int32_t)(count*size);
+ if (nCount == 0) return 0;
+
+ int32_t nRead;
+ if (m_Position + nCount > (int32_t)m_Size){
+ m_bEOF = true;
+ nRead = (m_Size - m_Position);
+ } else
+ nRead = nCount;
+
+ memcpy(buffer, m_pBuffer + m_Position, nRead);
+ m_Position += nRead;
+
+ return (size_t)(nRead/size);
+}
+//////////////////////////////////////////////////////////
+size_t CxMemFile::Write(const void *buffer, size_t size, size_t count)
+{
+ m_bEOF = false;
+ if (m_pBuffer==NULL) return 0;
+ if (buffer==NULL) return 0;
+
+ int32_t nCount = (int32_t)(count*size);
+ if (nCount == 0) return 0;
+
+ if (m_Position + nCount > m_Edge){
+ if (!Alloc(m_Position + nCount)){
+ return false;
+ }
+ }
+
+ memcpy(m_pBuffer + m_Position, buffer, nCount);
+
+ m_Position += nCount;
+
+ if (m_Position > (int32_t)m_Size) m_Size = m_Position;
+
+ return count;
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::Seek(int32_t offset, int32_t origin)
+{
+ m_bEOF = false;
+ if (m_pBuffer==NULL) return false;
+ int32_t lNewPos = m_Position;
+
+ if (origin == SEEK_SET) lNewPos = offset;
+ else if (origin == SEEK_CUR) lNewPos += offset;
+ else if (origin == SEEK_END) lNewPos = m_Size + offset;
+ else return false;
+
+ if (lNewPos < 0) lNewPos = 0;
+
+ m_Position = lNewPos;
+ return true;
+}
+//////////////////////////////////////////////////////////
+int32_t CxMemFile::Tell()
+{
+ if (m_pBuffer==NULL) return -1;
+ return m_Position;
+}
+//////////////////////////////////////////////////////////
+int32_t CxMemFile::Size()
+{
+ if (m_pBuffer==NULL) return -1;
+ return m_Size;
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::Flush()
+{
+ if (m_pBuffer==NULL) return false;
+ return true;
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::Eof()
+{
+ if (m_pBuffer==NULL) return true;
+ return m_bEOF;
+}
+//////////////////////////////////////////////////////////
+int32_t CxMemFile::Error()
+{
+ if (m_pBuffer==NULL) return -1;
+ return (m_Position > (int32_t)m_Size);
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::PutC(uint8_t c)
+{
+ m_bEOF = false;
+ if (m_pBuffer==NULL) return false;
+
+ if (m_Position >= m_Edge){
+ if (!Alloc(m_Position + 1)){
+ return false;
+ }
+ }
+
+ m_pBuffer[m_Position++] = c;
+
+ if (m_Position > (int32_t)m_Size) m_Size = m_Position;
+
+ return true;
+}
+//////////////////////////////////////////////////////////
+int32_t CxMemFile::GetC()
+{
+ if (m_pBuffer==NULL || m_Position >= (int32_t)m_Size){
+ m_bEOF = true;
+ return EOF;
+ }
+ return *(uint8_t*)((uint8_t*)m_pBuffer + m_Position++);
+}
+//////////////////////////////////////////////////////////
+char * CxMemFile::GetS(char *string, int32_t n)
+{
+ n--;
+ int32_t c,i=0;
+ while (i<n){
+ c = GetC();
+ if (c == EOF) return 0;
+ string[i++] = (char)c;
+ if (c == '\n') break;
+ }
+ string[i] = 0;
+ return string;
+}
+//////////////////////////////////////////////////////////
+int32_t CxMemFile::Scanf(const char *format, void* output)
+{
+ return 0;
+}
+//////////////////////////////////////////////////////////
+bool CxMemFile::Alloc(uint32_t dwNewLen)
+{
+ if (dwNewLen > (uint32_t)m_Edge)
+ {
+ // find new buffer size
+ uint32_t dwNewBufferSize = (uint32_t)(((dwNewLen>>16)+1)<<16);
+
+ // allocate new buffer
+ if (m_pBuffer == NULL) m_pBuffer = (uint8_t*)malloc(dwNewBufferSize);
+ else m_pBuffer = (uint8_t*)realloc(m_pBuffer, dwNewBufferSize);
+ // I own this buffer now (caller knows nothing about it)
+ m_bFreeOnClose = true;
+
+ m_Edge = dwNewBufferSize;
+ }
+ return (m_pBuffer!=0);
+}
+//////////////////////////////////////////////////////////
+void CxMemFile::Free()
+{
+ Close();
+}
+//////////////////////////////////////////////////////////
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