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Diffstat (limited to 'TestAPI/testMemIO.cpp')
-rw-r--r-- | TestAPI/testMemIO.cpp | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/TestAPI/testMemIO.cpp b/TestAPI/testMemIO.cpp new file mode 100644 index 0000000..8250a57 --- /dev/null +++ b/TestAPI/testMemIO.cpp @@ -0,0 +1,146 @@ +// ========================================================== +// FreeImage 3 Test Script +// +// Design and implementation by +// - Hervé Drolon (drolon@infonie.fr) +// +// This file is part of FreeImage 3 +// +// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY +// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES +// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE +// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED +// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT +// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY +// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL +// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER +// THIS DISCLAIMER. +// +// Use at your own risk! +// ========================================================== + + +#include "TestSuite.h" + +void testSaveMemIO(const char *lpszPathName) { + FIMEMORY *hmem = NULL; + + // load a regular file + FREE_IMAGE_FORMAT fif = FreeImage_GetFileType(lpszPathName); + FIBITMAP *dib = FreeImage_Load(fif, lpszPathName, 0); + + // open a memory handle + hmem = FreeImage_OpenMemory(); + + // save the file to memory + FreeImage_SaveToMemory(fif, dib, hmem, 0); + + // at this point, hmem contains the entire PNG data in memory. + // the amount of space used by the memory is equal to file_size + long file_size = FreeImage_TellMemory(hmem); + printf("File size : %ld\n", file_size); + + + // its easy load an image from memory as well + + // seek to the start of the memory stream + FreeImage_SeekMemory(hmem, 0L, SEEK_SET); + + // get the file type + FREE_IMAGE_FORMAT mem_fif = FreeImage_GetFileTypeFromMemory(hmem, 0); + + // load an image from the memory handle + FIBITMAP *check = FreeImage_LoadFromMemory(mem_fif, hmem, 0); + + // save as a regular file + FreeImage_Save(FIF_PNG, check, "dump.png", PNG_DEFAULT); + + // make sure to free the data since FreeImage_SaveToMemory + // will cause it to be malloc'd + FreeImage_CloseMemory(hmem); + + FreeImage_Unload(check); + FreeImage_Unload(dib); +} + + //you could also have image data in memory via some other method, and just set + //fmh.data to point to it, and set both fmh.datalen and fmh.filelen to the + //size of that data, then FreeImage_LoadFromMemory could load the image from that memory + +void testLoadMemIO(const char *lpszPathName) { + struct stat buf; + int result; + + // get data associated with lpszPathName + result = stat(lpszPathName, &buf); + if(result == 0) { + // allocate a memory buffer and load temporary data + BYTE *mem_buffer = (BYTE*)malloc(buf.st_size * sizeof(BYTE)); + if(mem_buffer) { + FILE *stream = fopen(lpszPathName, "rb"); + if(stream) { + fread(mem_buffer, sizeof(BYTE), buf.st_size, stream); + fclose(stream); + + // attach the binary data to a memory stream + FIMEMORY *hmem = FreeImage_OpenMemory(mem_buffer, buf.st_size); + + // get the file type + FREE_IMAGE_FORMAT fif = FreeImage_GetFileTypeFromMemory(hmem, 0); + + // load an image from the memory stream + FIBITMAP *check = FreeImage_LoadFromMemory(fif, hmem, PNG_DEFAULT); + + // save as a regular file + FreeImage_Save(FIF_PNG, check, "blob.png", PNG_DEFAULT); + FreeImage_Unload(check); + + // close the stream + FreeImage_CloseMemory(hmem); + + } + } + // user is responsible for freeing the data + free(mem_buffer); + } +} + +void testAcquireMemIO(const char *lpszPathName) { + FIMEMORY *hmem = NULL; + + // load a regular file + FREE_IMAGE_FORMAT fif = FreeImage_GetFileType(lpszPathName); + FIBITMAP *dib = FreeImage_Load(fif, lpszPathName, 0); + + // open and allocate a memory stream + hmem = FreeImage_OpenMemory(); + + // save the file to memory + FreeImage_SaveToMemory(FIF_PNG, dib, hmem, PNG_DEFAULT); + + FreeImage_Unload(dib); + + // get the buffer from the memory stream + BYTE *mem_buffer = NULL; + DWORD size_in_bytes = 0; + + FreeImage_AcquireMemory(hmem, &mem_buffer, &size_in_bytes); + + // save the buffer in a file stream + FILE *stream = fopen("buffer.png", "wb"); + if(stream) { + fwrite(mem_buffer, sizeof(BYTE), size_in_bytes, stream); + fclose(stream); + } + + // close and free the memory stream + FreeImage_CloseMemory(hmem); + +} + +void testMemIO(const char *lpszPathName) { + testSaveMemIO(lpszPathName); + testLoadMemIO(lpszPathName); + testAcquireMemIO(lpszPathName); +} + |