/** 

 * XML Security Library (http://www.aleksey.com/xmlsec).

 *

 * Memory buffer.

 *

 * This is free software; see Copyright file in the source

 * distribution for preciese wording.

 * 

 * Copyright (C) 2002-2003 Aleksey Sanin <aleksey@aleksey.com>

 * Portion Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 

 */

#include "xmlsec_globals.h"

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#include <errno.h>

#include <libxml2_tree.h>

#include <libxml2_globals.h>

#include "xmlsec_xmlsec.h"

#include "xmlsec_xmltree.h"

#include "xmlsec_base64.h"

#include "xmlsec_buffer.h"

#include "xmlsec_errors.h"

#include "xmlsec_error_flag.h"

//added for symbian port

#include "xmlsec_io.h"

/*****************************************************************************

 *

 * xmlSecBuffer

 *

 ****************************************************************************/

static xmlSecAllocMode gAllocMode = xmlSecAllocModeDouble;

static xmlSecSize gInitialSize = 1024;

/**

 * xmlSecBufferSetDefaultAllocMode:

 * @defAllocMode:	the new default buffer allocation mode.

 * @defInitialSize:	the new default buffer minimal intial size.

 * 

 * Sets new global default allocation mode and minimal intial size.

 */

EXPORT_C

void 

xmlSecBufferSetDefaultAllocMode(xmlSecAllocMode defAllocMode, xmlSecSize defInitialSize) {

    xmlSecAssert(defInitialSize > 0);

    gAllocMode = defAllocMode;

    gInitialSize = defInitialSize;

}

/**

 * xmlSecBufferCreate:

 * @size: 		the intial size.

 *

 * Allocates and initalizes new memory buffer with given size.

 * Caller is responsible for calling #xmlSecBufferDestroy function

 * to free the buffer.

 *

 * Returns pointer to newly allocated buffer or NULL if an error occurs.

 */

EXPORT_C

xmlSecBufferPtr 

xmlSecBufferCreate(xmlSecSize size) {

    xmlSecBufferPtr buf;

    int ret;

    buf = (xmlSecBufferPtr)xmlMalloc(sizeof(xmlSecBuffer));

    if(buf == NULL) {

	xmlSecError(XMLSEC_ERRORS_HERE,

		    NULL,

		    NULL,

		    XMLSEC_ERRORS_R_MALLOC_FAILED,

		    "sizeof(xmlSecBuffer)=%d", sizeof(xmlSecBuffer));

	return(NULL);

    }

    ret = xmlSecBufferInitialize(buf, size);

    if(ret < 0) {

	xmlSecError(XMLSEC_ERRORS_HERE,

		    NULL,

		    "xmlSecBufferInitialize",

		    XMLSEC_ERRORS_R_XMLSEC_FAILED,

		    "size=%d", size);

	xmlSecBufferDestroy(buf);

	return(NULL);

    }

    return(buf);

}

/**

 * xmlSecBufferDestroy:

 * @buf:		the pointer to buffer object.

 *

 * Desrtoys buffer object created with #xmlSecBufferCreate function.

 */

EXPORT_C

void 

xmlSecBufferDestroy(xmlSecBufferPtr buf) {

    xmlSecAssert(buf != NULL);

    xmlSecBufferFinalize(buf);

    xmlFree(buf);

}

/**

 * xmlSecBufferInitialize:

 * @buf:		the pointer to buffer object.

 * @size:		the initial buffer size.

 *

 * Initializes buffer object @buf. Caller is responsible for calling

 * #xmlSecBufferFinalize function to free allocated resources.

 * 

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferInitialize(xmlSecBufferPtr buf, xmlSecSize size) {

    xmlSecAssert2(buf != NULL, -1);

    buf->data = NULL;

    buf->size = buf->maxSize = 0;

    buf->allocMode = gAllocMode;

    return(xmlSecBufferSetMaxSize(buf, size));

}

/**

 * xmlSecBufferFinalize:

 * @buf:		the pointer to buffer object.

 *

 * Frees allocated resource for a buffer intialized with #xmlSecBufferInitialize

 * function.

 */

EXPORT_C

void 

xmlSecBufferFinalize(xmlSecBufferPtr buf) {

    xmlSecAssert(buf != NULL);

    xmlSecBufferEmpty(buf);    

    if(buf->data != 0) {

	xmlFree(buf->data);

    }

    buf->data = NULL;

    buf->size = buf->maxSize = 0;

}

/**

 * xmlSecBufferEmpty:

 * @buf:		the pointer to buffer object.

 *

 * Empties the buffer.

 */

EXPORT_C

void

xmlSecBufferEmpty(xmlSecBufferPtr buf) {

    xmlSecAssert(buf != NULL);

    if(buf->data != 0) {

	xmlSecAssert(buf->maxSize > 0);

	memset(buf->data, 0, buf->maxSize);

    }

    buf->size = 0;

}

/**

 * xmlSecBufferGetData:

 * @buf:		the pointer to buffer object.

 *

 * Gets pointer to buffer's data.

 *

 * Returns pointer to buffer's data.

 */

EXPORT_C

xmlSecByte* 

xmlSecBufferGetData(xmlSecBufferPtr buf) {

    xmlSecAssert2(buf != NULL, NULL);

    return(buf->data);

}

/**

 * xmlSecBufferSetData:

 * @buf:		the pointer to buffer object.

 * @data:		the data.

 * @size:		the data size.

 *

 * Sets the value of the buffer to @data.

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferSetData(xmlSecBufferPtr buf, const xmlSecByte* data, xmlSecSize size) {

    int ret;

    xmlSecAssert2(buf != NULL, -1);

    xmlSecBufferEmpty(buf);

    if(size > 0) {

	xmlSecAssert2(data != NULL, -1);

	ret = xmlSecBufferSetMaxSize(buf, size);

	if(ret < 0) {

	    xmlSecError(XMLSEC_ERRORS_HERE,

			NULL,

			"xmlSecBufferSetMaxSize",

			XMLSEC_ERRORS_R_XMLSEC_FAILED,

			"size=%d", size);

	    return(-1);

        }

	memcpy(buf->data, data, size);

    }

    buf->size = size;    

    return(0);

}

/**

 * xmlSecBufferGetSize:

 * @buf:		the pointer to buffer object.

 *

 * Gets the current buffer data size.

 *

 * Returns the current data size.

 */

EXPORT_C

xmlSecSize 

xmlSecBufferGetSize(xmlSecBufferPtr buf) {

    xmlSecAssert2(buf != NULL, 0);

    return(buf->size);

}

/**

 * xmlSecBufferSetSize:

 * @buf:		the pointer to buffer object.

 * @size:		the new data size.

 *

 * Sets new buffer data size. If necessary, buffer grows to 

 * have at least @size bytes. 

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferSetSize(xmlSecBufferPtr buf, xmlSecSize size) {

    int ret;

    xmlSecAssert2(buf != NULL, -1);

    ret = xmlSecBufferSetMaxSize(buf, size);

    if(ret < 0) {

	xmlSecError(XMLSEC_ERRORS_HERE,

		    NULL,

		    "xmlSecBufferSetMaxSize",

		    XMLSEC_ERRORS_R_XMLSEC_FAILED,

		    "size=%d", size);

	return(-1);

    }

    buf->size = size;

    return(0);

}

/**

 * xmlSecBufferGetMaxSize:

 * @buf:		the pointer to buffer object.

 *

 * Gets the maximum (allocated) buffer size.

 *

 * Returns the maximum (allocated) buffer size.

 */

EXPORT_C

xmlSecSize 

xmlSecBufferGetMaxSize(xmlSecBufferPtr buf) {

    xmlSecAssert2(buf != NULL, 0);

    return(buf->maxSize);

}

/**

 * xmlSecBufferSetMaxSize:

 * @buf:		the pointer to buffer object.

 * @size:		the new maximum size.

 *

 * Sets new buffer maximum size. If necessary, buffer grows to 

 * have at least @size bytes. 

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferSetMaxSize(xmlSecBufferPtr buf, xmlSecSize size) {

    xmlSecByte* newData;

    xmlSecSize newSize = 0;

    xmlSecAssert2(buf != NULL, -1);

    if(size <= buf->maxSize) {

	return(0);

    }

    switch(buf->allocMode) {

	case xmlSecAllocModeExact:

	    newSize = size + 8;

	    break;

	case xmlSecAllocModeDouble:

	    newSize = 2 * size + 32;

	    break;

    }

    if(newSize < gInitialSize) {

	newSize = gInitialSize;

    }

    if(buf->data != NULL) {

    	newData = (xmlSecByte*)xmlRealloc(buf->data, newSize);

    } else {

    	newData = (xmlSecByte*)xmlMalloc(newSize);

    }

    if(newData == NULL) {

	xmlSecError(XMLSEC_ERRORS_HERE,

		    NULL,

		    NULL,

		    XMLSEC_ERRORS_R_MALLOC_FAILED,

		    "size=%d", newSize);

	return(-1);

    }

    buf->data = newData;

    buf->maxSize = newSize;

    if(buf->size < buf->maxSize) {

	xmlSecAssert2(buf->data != NULL, -1);

	memset(buf->data + buf->size, 0, buf->maxSize - buf->size);

    }

    return(0);

}

/**

 * xmlSecBufferAppend:

 * @buf:		the pointer to buffer object.

 * @data:		the data.

 * @size:		the data size.

 *

 * Appends the @data after the current data stored in the buffer.

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferAppend(xmlSecBufferPtr buf, const xmlSecByte* data, xmlSecSize size) {

    int ret;

    xmlSecAssert2(buf != NULL, -1);

    if(size > 0) {

	xmlSecAssert2(data != NULL, -1);

        ret = xmlSecBufferSetMaxSize(buf, buf->size + size);

	if(ret < 0) {

	    xmlSecError(XMLSEC_ERRORS_HERE,

			NULL,

			"xmlSecBufferSetMaxSize",

			XMLSEC_ERRORS_R_XMLSEC_FAILED,

			"size=%d", buf->size + size);

	    return(-1);

	}

	memcpy(buf->data + buf->size, data, size);

	buf->size += size;    

    }

    return(0);

}

/**

 * xmlSecBufferPrepend:

 * @buf:		the pointer to buffer object.

 * @data:		the data.

 * @size:		the data size.

 *

 * Prepends the @data before the current data stored in the buffer.

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int

xmlSecBufferPrepend(xmlSecBufferPtr buf, const xmlSecByte* data, xmlSecSize size) {

    int ret;

    xmlSecAssert2(buf != NULL, -1);

    if(size > 0) {

	xmlSecAssert2(data != NULL, -1);

	ret = xmlSecBufferSetMaxSize(buf, buf->size + size);

	if(ret < 0) {

	    xmlSecError(XMLSEC_ERRORS_HERE,

			NULL,

			"xmlSecBufferSetMaxSize",

			XMLSEC_ERRORS_R_XMLSEC_FAILED,

			"size=%d", buf->size + size);

	    return(-1);

	}

	memmove(buf->data + size, buf->data, buf->size);	

	memcpy(buf->data, data, size);

	buf->size += size;    

    }

    return(0);

}

/**

 * xmlSecBufferRemoveHead:

 * @buf:		the pointer to buffer object.

 * @size:		the number of bytes to be removed.

 *

 * Removes @size bytes from the beginning of the current buffer.

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferRemoveHead(xmlSecBufferPtr buf, xmlSecSize size) {

    xmlSecAssert2(buf != NULL, -1);

    if(size < buf->size) {

	xmlSecAssert2(buf->data != NULL, -1);

	buf->size -= size;

	memmove(buf->data, buf->data + size, buf->size);

    } else {

	buf->size = 0;

    }

    if(buf->size < buf->maxSize) {

	xmlSecAssert2(buf->data != NULL, -1);

	memset(buf->data + buf->size, 0, buf->maxSize - buf->size);

    }

    return(0);

}

/**

 * xmlSecBufferRemoveTail:

 * @buf:		the pointer to buffer object.

 * @size:		the number of bytes to be removed.

 *

 * Removes @size bytes from the end of current buffer.

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferRemoveTail(xmlSecBufferPtr buf, xmlSecSize size) {

    xmlSecAssert2(buf != NULL, -1);

    if(size < buf->size) {

	buf->size -= size;

    } else {

	buf->size = 0;

    }

    if(buf->size < buf->maxSize) {

	xmlSecAssert2(buf->data != NULL, -1);

	memset(buf->data + buf->size, 0, buf->maxSize - buf->size);

    }

    return(0);

}

/**

 * xmlSecBufferReadFile:

 * @buf:		the pointer to buffer object.

 * @filename:		the filename.

 *

 * Reads the content of the file @filename in the buffer.

 *

 * Returns 0 on success or a negative value if an error occurs.

 */

EXPORT_C

int 

xmlSecBufferReadFile(xmlSecBufferPtr buf, const char* filename) {

    xmlSecByte buffer[1024];

    FILE* f;

    int ret, len;

    xmlSecAssert2(buf != NULL, -1);

    xmlSecAssert2(filename != NULL, -1);

    f = fopen(filename, "rb");

    if(f == NULL) {

	xmlSecError(XMLSEC_ERRORS_HERE,

		    NULL,

		    "fopen",

		    XMLSEC_ERRORS_R_IO_FAILED,

		    "filename=%s;errno=%d", 

		    xmlSecErrorsSafeString(filename),

		    errno);

    if ( errno == ENOMEM )

        {

        xmlSecSetErrorFlag( -4 ); //KErrNoMemory

        }

	return(-1);

    }

    while(1) {

        len = fread(buffer, 1, sizeof(buffer), f);

	if(len == 0 && !errno) {

            break;

        }else if( errno ) {

            xmlSecError(XMLSEC_ERRORS_HERE,

                        NULL,

                        "fread",

                        XMLSEC_ERRORS_R_IO_FAILED,

                        "filename=%s;errno=%d", 

                        xmlSecErrorsSafeString(filename),

			errno);

			if ( errno == ENOMEM )

                {