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// ==========================================================
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// Classified FreeImageIO handler
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// Design and implementation by
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// - schickb (schickb@hotmail.com)
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// This file is part of FreeImage 3
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// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
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// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
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// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
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// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
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// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
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// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
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// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
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// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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// Use at your own risk!
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// ==========================================================
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class MemIO : public FreeImageIO {
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MemIO( BYTE *data ) : _start(data), _cp(data) {
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read_proc = _ReadProc;
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write_proc = _WriteProc;
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tell_proc = _TellProc;
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seek_proc = _SeekProc;
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static unsigned _ReadProc(void *buffer, unsigned size, unsigned count, fi_handle handle);
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static unsigned _WriteProc(void *buffer, unsigned size, unsigned count, fi_handle handle);
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static int _SeekProc(fi_handle handle, long offset, int origin);
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static long _TellProc(fi_handle handle);
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MemIO::_ReadProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
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MemIO *memIO = (MemIO*)handle;
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BYTE *tmp = (BYTE *)buffer;
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for (unsigned c = 0; c < count; c++) {
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memcpy(tmp, memIO->_cp, size);
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memIO->_cp = memIO->_cp + size;
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MemIO::_WriteProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
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MemIO::_SeekProc(fi_handle handle, long offset, int origin) {
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ASSERT(origin != SEEK_END);
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MemIO *memIO = (MemIO*)handle;
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if (origin == SEEK_SET)
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memIO->_cp = memIO->_start + offset;
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memIO->_cp = memIO->_cp + offset;
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MemIO::_TellProc(fi_handle handle) {
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MemIO *memIO = (MemIO*)handle;
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return memIO->_cp - memIO->_start;
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// ----------------------------------------------------------
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// PSEUDOCODE... HELPS TO UNDERSTAND HOW THE MEMIO CLASS WORKS
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// ----------------------------------------------------------
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main(int argc, char *argv[]) {
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BYTE *data = loadimagesomehow();
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FIBITMAP *fbmp = FreeImage_LoadFromHandle( fif, &memIO, (fi_handle)&memIO );
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