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/* pngwio.c - functions for data output
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* Last changed in libpng 1.4.0 [January 3, 2010]
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* Copyright (c) 1998-2010 Glenn Randers-Pehrson
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* Last changed in libpng 1.6.15 [November 20, 2014]
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* Copyright (c) 1998-2014 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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* them at run time with png_set_write_fn(...).
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#define PNG_NO_PEDANTIC_WARNINGS
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#ifdef PNG_WRITE_SUPPORTED
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/* Write the data to whatever output you are using. The default routine
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* writes to a file pointer. Note that this routine sometimes gets called
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png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
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png_write_data(png_structrp png_ptr, png_const_bytep data, png_size_t length)
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/* NOTE: write_data_fn must not change the buffer! */
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if (png_ptr->write_data_fn != NULL )
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(*(png_ptr->write_data_fn))(png_ptr, data, length);
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(*(png_ptr->write_data_fn))(png_ptr, png_constcast(png_bytep,data),
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png_error(png_ptr, "Call to NULL write function");
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* write_data function and use it at run time with png_set_write_fn(), rather
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* than changing the library.
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#ifndef USE_FAR_KEYWORD
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png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
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if (png_ptr == NULL)
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check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
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png_error(png_ptr, "Write Error");
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/* This is the model-independent version. Since the standard I/O library
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* can't handle far buffers in the medium and small models, we have to copy
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#define NEAR_BUF_SIZE 1024
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#define MIN(a,b) (a <= b ? a : b)
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png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
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png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
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/* Check if data really is near. If so, use usual code. */
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near_data = (png_byte *)CVT_PTR_NOCHECK(data);
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io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
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if ((png_bytep)near_data == data)
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check = fwrite(near_data, 1, length, io_ptr);
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png_byte buf[NEAR_BUF_SIZE];
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png_size_t written, remaining, err;
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written = MIN(NEAR_BUF_SIZE, remaining);
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png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
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err = fwrite(buf, 1, written, io_ptr);
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remaining -= written;
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while (remaining != 0);
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png_error(png_ptr, "Write Error");
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png_error(png_ptr, "Write Error");
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/* This function is called to output any data pending writing (normally
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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void /* PRIVATE */
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png_flush(png_structp png_ptr)
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png_flush(png_structrp png_ptr)
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if (png_ptr->output_flush_fn != NULL)
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(*(png_ptr->output_flush_fn))(png_ptr);
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#ifdef PNG_STDIO_SUPPORTED
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# ifdef PNG_STDIO_SUPPORTED
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png_default_flush(png_structp png_ptr)
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png_FILE_p io_ptr;
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if (png_ptr == NULL)
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io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
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io_ptr = png_voidcast(png_FILE_p, (png_ptr->io_ptr));
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/* This function allows the application to supply new output functions for
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* *FILE structure.
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png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
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png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
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png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr,
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png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
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if (png_ptr == NULL)
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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#ifdef PNG_STDIO_SUPPORTED
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# ifdef PNG_STDIO_SUPPORTED
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if (output_flush_fn != NULL)
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png_ptr->output_flush_fn = output_flush_fn;
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png_ptr->output_flush_fn = png_default_flush;
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png_ptr->output_flush_fn = output_flush_fn;
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#endif /* PNG_WRITE_FLUSH_SUPPORTED */
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PNG_UNUSED(output_flush_fn)
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#endif /* WRITE_FLUSH */
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#ifdef PNG_READ_SUPPORTED
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/* It is an error to read while writing a png file */
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if (png_ptr->read_data_fn != NULL)
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png_ptr->read_data_fn = NULL;
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"Attempted to set both read_data_fn and write_data_fn in");
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"the same structure. Resetting read_data_fn to NULL");
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"Can't set both read_data_fn and write_data_fn in the"
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#ifdef USE_FAR_KEYWORD
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void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
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FP_OFF(near_ptr) = FP_OFF(ptr);
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far_ptr = (void FAR *)near_ptr;
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if (FP_SEG(ptr) != FP_SEG(far_ptr))
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png_error(png_ptr, "segment lost in conversion");
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void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
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near_ptr = (void FAR *)ptr;
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far_ptr = (void FAR *)near_ptr;
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png_error(png_ptr, "segment lost in conversion");
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#endif /* PNG_WRITE_SUPPORTED */