95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
/**************************************************************************\
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*
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* Copyright (c) 1998 Microsoft Corporation
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*
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* Module Name:
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*
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* shared.cpp
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*
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* Abstract:
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*
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* Constructs shared between the decoder and the encoder. I put them
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* in a separate file so that if one wants to link in just the encoder
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* from jpeg.lib, they won't pull in the object files for the decoder
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* and exif.
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*
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* Revision History:
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*
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* 9/24/1999 Ori Gershony (OriG)
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* Created it.
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*
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\**************************************************************************/
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#include "precomp.hpp"
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#include "jpgcodec.hpp"
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VOID jpeg_error_exit(j_common_ptr cinfo)
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{
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RaiseException(0, 0, 0, NULL);
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}
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// Memory manager functions. Note that the JPEG MMX codes require 64-bit
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// aligned memory. On NT malloc always returns 64-bit aligned memory,
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// but on Win9x the memory is only 32-bit aligned. So our memory manager
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// guarantees 64-bit alignment on top of malloc calls.
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extern "C"
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{
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#include "jmemsys.h"
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#define ALIGN_SIZE sizeof(double) // must be a power of 2 and
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// bigger than a pointer
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GLOBAL(void FAR *)
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jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
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{
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INT_PTR p = (INT_PTR) GpMalloc(sizeofobject + ALIGN_SIZE);
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if ( p == NULL )
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{
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return NULL;
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}
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INT_PTR *alignedPtr = (INT_PTR *) ((p + ALIGN_SIZE) & ~(ALIGN_SIZE - 1));
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alignedPtr[-1] = p;
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return (void *) alignedPtr;
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}
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GLOBAL(void)
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jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
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{
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GpFree(((void **) object)[-1]);
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}
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GLOBAL(void *)
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jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
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{
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return jpeg_get_large(cinfo, sizeofobject);
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}
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GLOBAL(void)
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jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
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{
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jpeg_free_large(cinfo, object, sizeofobject);
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}
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GLOBAL(long)
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jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
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long max_bytes_needed, long already_allocated)
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{
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return max_bytes_needed;
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}
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GLOBAL(void)
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jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
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long total_bytes_needed)
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{
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jpeg_error_exit(cinfo);
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}
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GLOBAL(long) jpeg_mem_init (j_common_ptr cinfo) { return 0;}
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GLOBAL(void) jpeg_mem_term (j_common_ptr cinfo) {}
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}
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