scbstream.c File Reference

#include <memory.h>
#include "scbstream.h"
#include "scblog.h"

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Defines
#define	_GNU_SOURCE
Functions
ScbStreamPtr	erscribble_create_stream (const int size)
void	erscribble_free_stream (ScbStreamPtr stream, gboolean is_free_buffer)
gboolean	erscribble_read_stream (ScbStreamPtr stream, void *data, const int length)
gboolean	erscribble_write_stream (ScbStreamPtr stream, const void *data, const int length)
void	erscribble_reset_offset (ScbStreamPtr stream)

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Define Documentation

#define _GNU_SOURCE

Copyright (C) 2008 iRex Technologies B.V. All rights reserved.

Definition at line 28 of file scbstream.c.

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Function Documentation

ScbStreamPtr erscribble_create_stream

(

const int

size

)

Definition at line 68 of file scbstream.c.

References ERRORPRINTF.

Referenced by erscribble_doc_save_page(), and load_page_data().

{
    ScbStreamPtr ptr = g_new0(ScbStream, 1);

    if (ptr == NULL)
    {
        ERRORPRINTF("Could not allocate memory stream!");
        return NULL;
    }

    ptr->buffer = g_malloc0(size);
    if (ptr->buffer == NULL)
    {
        ERRORPRINTF("Could not allocate memory stream!");
        g_free(ptr);
        return NULL;
    }
    ptr->size = size;

    return ptr;
}

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void erscribble_free_stream	(	ScbStreamPtr	stream,
		gboolean	is_free_buffer
	)

Definition at line 91 of file scbstream.c.

Referenced by erscribble_doc_save_page(), and load_page_data().

{
    if (stream)
    {
        // release the memory
        if (stream->buffer && is_free_buffer)
        {
            g_free(stream->buffer);
            stream->buffer = NULL;
        }

        g_free(stream);
    }
}

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gboolean erscribble_read_stream	(	ScbStreamPtr	stream,
		void *	data,
		const int	length
	)

Definition at line 107 of file scbstream.c.

Referenced by erscribble_page_load(), erscribble_point_load(), and erscribble_stroke_load().

{
    if (stream->offset + length > stream->size)
    {
        return FALSE;
    }

    unsigned char * src = (unsigned char*)stream->buffer + stream->offset;

    memcpy(data, src, length);

    stream->offset += length;

    return TRUE;
}

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void erscribble_reset_offset

(

ScbStreamPtr

stream

)

Definition at line 158 of file scbstream.c.

Referenced by load_page_data().

{
    stream->offset = 0;
}

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gboolean erscribble_write_stream	(	ScbStreamPtr	stream,
		const void *	data,
		const int	length
	)

Definition at line 124 of file scbstream.c.

Referenced by erscribble_page_write_stream(), erscribble_stroke_write_stream(), and load_page_data().

{
    if (stream->offset + length > stream->size)
    {
        // reallocate memory
        void * new_mem = g_malloc0(stream->size + length);

        if (new_mem == NULL)
        {
            return FALSE;
        }

        // copy the content from previous buffer to new buffer
        memcpy(new_mem, stream->buffer, stream->offset);

        // free the previous buffer
        g_free(stream->buffer);

        stream->buffer = new_mem;

        stream->size += length;
    }

    unsigned char * dst = (unsigned char *)stream->buffer + stream->offset;

    // copy the memory to the buffer
    memcpy(dst, data, length);

    stream->offset += length;
    
    return TRUE;
}

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