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+/****************************************************************************
+ *
+ * ftsystem.c
+ *
+ * ANSI-specific FreeType low-level system interface (body).
+ *
+ * Copyright (C) 1996-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * This file is part of the FreeType project, and may only be used,
+ * modified, and distributed under the terms of the FreeType project
+ * license, LICENSE.TXT. By continuing to use, modify, or distribute
+ * this file you indicate that you have read the license and
+ * understand and accept it fully.
+ *
+ */
+
+ /**************************************************************************
+ *
+ * This file contains the default interface used by FreeType to access
+ * low-level, i.e. memory management, i/o access as well as thread
+ * synchronisation. It can be replaced by user-specific routines if
+ * necessary.
+ *
+ */
+
+
+#include <ft2build.h>
+#include FT_CONFIG_CONFIG_H
+#include <freetype/internal/ftdebug.h>
+#include <freetype/internal/ftstream.h>
+#include <freetype/ftsystem.h>
+#include <freetype/fterrors.h>
+#include <freetype/fttypes.h>
+
+
+ /**************************************************************************
+ *
+ * MEMORY MANAGEMENT INTERFACE
+ *
+ */
+
+ /**************************************************************************
+ *
+ * It is not necessary to do any error checking for the
+ * allocation-related functions. This will be done by the higher level
+ * routines like ft_mem_alloc() or ft_mem_realloc().
+ *
+ */
+
+
+ /**************************************************************************
+ *
+ * @Function:
+ * ft_alloc
+ *
+ * @Description:
+ * The memory allocation function.
+ *
+ * @Input:
+ * memory ::
+ * A pointer to the memory object.
+ *
+ * size ::
+ * The requested size in bytes.
+ *
+ * @Return:
+ * The address of newly allocated block.
+ */
+ FT_CALLBACK_DEF( void* )
+ ft_alloc( FT_Memory memory,
+ long size )
+ {
+ FT_UNUSED( memory );
+
+ return ft_smalloc( (size_t)size );
+ }
+
+
+ /**************************************************************************
+ *
+ * @Function:
+ * ft_realloc
+ *
+ * @Description:
+ * The memory reallocation function.
+ *
+ * @Input:
+ * memory ::
+ * A pointer to the memory object.
+ *
+ * cur_size ::
+ * The current size of the allocated memory block.
+ *
+ * new_size ::
+ * The newly requested size in bytes.
+ *
+ * block ::
+ * The current address of the block in memory.
+ *
+ * @Return:
+ * The address of the reallocated memory block.
+ */
+ FT_CALLBACK_DEF( void* )
+ ft_realloc( FT_Memory memory,
+ long cur_size,
+ long new_size,
+ void* block )
+ {
+ FT_UNUSED( memory );
+ FT_UNUSED( cur_size );
+
+ return ft_srealloc( block, (size_t)new_size );
+ }
+
+
+ /**************************************************************************
+ *
+ * @Function:
+ * ft_free
+ *
+ * @Description:
+ * The memory release function.
+ *
+ * @Input:
+ * memory ::
+ * A pointer to the memory object.
+ *
+ * block ::
+ * The address of block in memory to be freed.
+ */
+ FT_CALLBACK_DEF( void )
+ ft_free( FT_Memory memory,
+ void* block )
+ {
+ FT_UNUSED( memory );
+
+ ft_sfree( block );
+ }
+
+
+ /**************************************************************************
+ *
+ * RESOURCE MANAGEMENT INTERFACE
+ *
+ */
+
+#ifndef FT_CONFIG_OPTION_DISABLE_STREAM_SUPPORT
+
+ /**************************************************************************
+ *
+ * The macro FT_COMPONENT is used in trace mode. It is an implicit
+ * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
+ * messages during execution.
+ */
+#undef FT_COMPONENT
+#define FT_COMPONENT io
+
+ /* We use the macro STREAM_FILE for convenience to extract the */
+ /* system-specific stream handle from a given FreeType stream object */
+#define STREAM_FILE( stream ) ( (FT_FILE*)stream->descriptor.pointer )
+
+
+ /**************************************************************************
+ *
+ * @Function:
+ * ft_ansi_stream_close
+ *
+ * @Description:
+ * The function to close a stream.
+ *
+ * @Input:
+ * stream ::
+ * A pointer to the stream object.
+ */
+ FT_CALLBACK_DEF( void )
+ ft_ansi_stream_close( FT_Stream stream )
+ {
+ ft_fclose( STREAM_FILE( stream ) );
+
+ stream->descriptor.pointer = NULL;
+ stream->size = 0;
+ stream->base = NULL;
+ }
+
+
+ /**************************************************************************
+ *
+ * @Function:
+ * ft_ansi_stream_io
+ *
+ * @Description:
+ * The function to open a stream.
+ *
+ * @Input:
+ * stream ::
+ * A pointer to the stream object.
+ *
+ * offset ::
+ * The position in the data stream to start reading.
+ *
+ * buffer ::
+ * The address of buffer to store the read data.
+ *
+ * count ::
+ * The number of bytes to read from the stream.
+ *
+ * @Return:
+ * The number of bytes actually read. If `count' is zero (this is,
+ * the function is used for seeking), a non-zero return value
+ * indicates an error.
+ */
+ FT_CALLBACK_DEF( unsigned long )
+ ft_ansi_stream_io( FT_Stream stream,
+ unsigned long offset,
+ unsigned char* buffer,
+ unsigned long count )
+ {
+ FT_FILE* file;
+
+
+ if ( !count && offset > stream->size )
+ return 1;
+
+ file = STREAM_FILE( stream );
+
+ if ( stream->pos != offset )
+ ft_fseek( file, (long)offset, SEEK_SET );
+
+ return (unsigned long)ft_fread( buffer, 1, count, file );
+ }
+
+
+ /* documentation is in ftstream.h */
+
+ FT_BASE_DEF( FT_Error )
+ FT_Stream_Open( FT_Stream stream,
+ const char* filepathname )
+ {
+ FT_FILE* file;
+
+
+ if ( !stream )
+ return FT_THROW( Invalid_Stream_Handle );
+
+ stream->descriptor.pointer = NULL;
+ stream->pathname.pointer = (char*)filepathname;
+ stream->base = NULL;
+ stream->pos = 0;
+ stream->read = NULL;
+ stream->close = NULL;
+
+ file = ft_fopen( filepathname, "rb" );
+ if ( !file )
+ {
+ FT_ERROR(( "FT_Stream_Open:"
+ " could not open `%s'\n", filepathname ));
+
+ return FT_THROW( Cannot_Open_Resource );
+ }
+
+ ft_fseek( file, 0, SEEK_END );
+ stream->size = (unsigned long)ft_ftell( file );
+ if ( !stream->size )
+ {
+ FT_ERROR(( "FT_Stream_Open:" ));
+ FT_ERROR(( " opened `%s' but zero-sized\n", filepathname ));
+ ft_fclose( file );
+ return FT_THROW( Cannot_Open_Stream );
+ }
+ ft_fseek( file, 0, SEEK_SET );
+
+ stream->descriptor.pointer = file;
+ stream->read = ft_ansi_stream_io;
+ stream->close = ft_ansi_stream_close;
+
+ FT_TRACE1(( "FT_Stream_Open:" ));
+ FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n",
+ filepathname, stream->size ));
+
+ return FT_Err_Ok;
+ }
+
+#endif /* !FT_CONFIG_OPTION_DISABLE_STREAM_SUPPORT */
+
+#ifdef FT_DEBUG_MEMORY
+
+ extern FT_Int
+ ft_mem_debug_init( FT_Memory memory );
+
+ extern void
+ ft_mem_debug_done( FT_Memory memory );
+
+#endif
+
+
+ /* documentation is in ftobjs.h */
+
+ FT_BASE_DEF( FT_Memory )
+ FT_New_Memory( void )
+ {
+ FT_Memory memory;
+
+
+ memory = (FT_Memory)ft_smalloc( sizeof ( *memory ) );
+ if ( memory )
+ {
+ memory->user = NULL;
+ memory->alloc = ft_alloc;
+ memory->realloc = ft_realloc;
+ memory->free = ft_free;
+#ifdef FT_DEBUG_MEMORY
+ ft_mem_debug_init( memory );
+#endif
+ }
+
+ return memory;
+ }
+
+
+ /* documentation is in ftobjs.h */
+
+ FT_BASE_DEF( void )
+ FT_Done_Memory( FT_Memory memory )
+ {
+#ifdef FT_DEBUG_MEMORY
+ ft_mem_debug_done( memory );
+#endif
+ ft_sfree( memory );
+ }
+
+
+/* END */
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