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	/* data.c
	* Copyright (C) 2000 Werner Koch (dd9jn)
	*
	* This file is part of GPGME.
	*
	* GPGME is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* GPGME is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
	*/

	#include <config.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <assert.h>
	#include <errno.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include "syshdr.h"

	#include "util.h"
	#include "context.h"
	#include "ops.h"

	#define ALLOC_CHUNK 1024
	#define my_isdigit(a) ( (a) >='0' && (a) <= '9' )
	#define my_isxdigit(a) ( my_isdigit((a)) \
	\|\| ((a) >= 'A' && (a) <= 'F') \
	\|\| ((a) >= 'f' && (a) <= 'f') )


	/**
	* gpgme_data_new:
	* @r_dh: returns the new data object
	*
	* Create a new data object without any content.
	*
	* Return value: An error value or 0 on success
	**/
	GpgmeError
	gpgme_data_new ( GpgmeData *r_dh )
	{
	GpgmeData dh;

	if (!r_dh)
	return mk_error (Invalid_Value);
	*r_dh = NULL;
	dh = xtrycalloc ( 1, sizeof *dh );
	if (!dh)
	return mk_error (Out_Of_Core);
	dh->mode = GPGME_DATA_MODE_INOUT;
	*r_dh = dh;
	return 0;
	}


	/**
	* gpgme_data_new_from_mem:
	* @r_dh: Returns a new data object.
	* @buffer: Initialize with this.
	* @size: Size of the buffer
	* @copy: Flag wether a copy of the buffer should be used.
	*
	* Create a new data object and initialize with data
	* from the memory. A @copy with value %TRUE creates a copy of the
	* memory, a value of %FALSE uses the original memory of @buffer and the
	* caller has to make sure that this buffer is valid until gpgme_release_data()
	* is called.
	*
	* Return value:
	**/
	GpgmeError
	gpgme_data_new_from_mem ( GpgmeData *r_dh,
	const char *buffer, size_t size, int copy )
	{
	GpgmeData dh;
	GpgmeError err;

	if (!r_dh \|\| !buffer)
	return mk_error (Invalid_Value);
	*r_dh = NULL;
	err = gpgme_data_new ( &dh );
	if (err)
	return err;
	dh->len = size;
	if (copy) {
	dh->private_buffer = xtrymalloc ( size );
	if ( !dh->private_buffer ) {
	gpgme_data_release (dh);
	return mk_error (Out_Of_Core);
	}
	dh->private_len = size;
	memcpy (dh->private_buffer, buffer, size );
	dh->data = dh->private_buffer;
	dh->writepos = size;
	}
	else {
	dh->data = buffer;
	}
	dh->type = GPGME_DATA_TYPE_MEM;

	*r_dh = dh;
	return 0;
	}


	GpgmeError
	gpgme_data_new_with_read_cb ( GpgmeData *r_dh,
	int (read_cb)(void,char ,size_t,size_t),
	void *read_cb_value )
	{
	GpgmeData dh;
	GpgmeError err;

	if (!r_dh \|\| !read_cb)
	return mk_error (Invalid_Value);
	*r_dh = NULL;
	err = gpgme_data_new ( &dh );
	if (err)
	return err;
	dh->type = GPGME_DATA_TYPE_CB;
	dh->mode = GPGME_DATA_MODE_OUT;
	dh->read_cb = read_cb;
	dh->read_cb_value = read_cb_value;

	*r_dh = dh;
	return 0;
	}

	/**
	* gpgme_data_new_from_file:
	* @r_dh: returns the new data object
	* @fname: filename
	* @copy: Flag, whether the file should be copied.
	*
	* Create a new data object and initialize it with the content of
	* the file @file. If @copy is %True the file is immediately read in
	* adn closed. @copy of %False is not yet supportted.
	*
	* Return value: An error code or 0 on success. If the error code is
	* %GPGME_File_Error, the OS error code is held in %errno.
	**/
	GpgmeError
	gpgme_data_new_from_file ( GpgmeData r_dh, const char fname, int copy )
	{
	GpgmeData dh;
	GpgmeError err;
	struct stat st;
	FILE *fp;

	if (!r_dh)
	return mk_error (Invalid_Value);
	*r_dh = NULL;
	/* We only support copy for now - in future we might want to honor the
	* copy flag and just store a file pointer */
	if (!copy)
	return mk_error (Not_Implemented);
	if (!fname)
	return mk_error (Invalid_Value);

	err = gpgme_data_new ( &dh );
	if (err)
	return err;

	fp = fopen (fname, "rb");
	if (!fp) {
	int save_errno = errno;
	gpgme_data_release (dh);
	errno = save_errno;
	return mk_error (File_Error);
	}

	if( fstat(fileno(fp), &st) ) {
	int save_errno = errno;
	fclose (fp);
	gpgme_data_release (dh);
	errno = save_errno;
	return mk_error (File_Error);
	}

	/* We should check the length of the file and don't allow for to
	* large files */
	dh->private_buffer = xtrymalloc ( st.st_size );
	if ( !dh->private_buffer ) {
	fclose (fp);
	gpgme_data_release (dh);
	return mk_error (Out_Of_Core);
	}
	dh->private_len = st.st_size;

	if ( fread ( dh->private_buffer, dh->private_len, 1, fp ) != 1 ) {
	int save_errno = errno;
	fclose (fp);
	gpgme_data_release (dh);
	errno = save_errno;
	return mk_error (File_Error);
	}

	fclose (fp);

	dh->len = dh->private_len;
	dh->data = dh->private_buffer;
	dh->writepos = dh->len;
	dh->type = GPGME_DATA_TYPE_MEM;

	*r_dh = dh;
	return 0;
	}


	GpgmeError
	gpgme_data_new_from_filepart ( GpgmeData r_dh, const char fname, FILE *fp,
	off_t offset, off_t length )
	{
	GpgmeData dh;
	GpgmeError err;

	if (!r_dh)
	return mk_error (Invalid_Value);
	*r_dh = NULL;
	if ( fname && fp ) /* these are mutual exclusive */
	return mk_error (Invalid_Value);
	if (!fname && !fp)
	return mk_error (Invalid_Value);
	if (!length)
	return mk_error (Invalid_Value);

	err = gpgme_data_new ( &dh );
	if (err)
	return err;

	if (!fp) {
	fp = fopen (fname, "rb");
	if (!fp) {
	int save_errno = errno;
	gpgme_data_release (dh);
	errno = save_errno;
	return mk_error (File_Error);
	}
	}

	if ( fseek ( fp, (long)offset, SEEK_SET) ) {
	int save_errno = errno;
	if (fname)
	fclose (fp);
	gpgme_data_release (dh);
	errno = save_errno;
	return mk_error (File_Error);
	}


	dh->private_buffer = xtrymalloc ( length );
	if ( !dh->private_buffer ) {
	if (fname)
	fclose (fp);
	gpgme_data_release (dh);
	return mk_error (Out_Of_Core);
	}
	dh->private_len = length;

	if ( fread ( dh->private_buffer, dh->private_len, 1, fp ) != 1 ) {
	int save_errno = errno;
	if (fname)
	fclose (fp);
	gpgme_data_release (dh);
	errno = save_errno;
	return mk_error (File_Error);
	}

	if (fname)
	fclose (fp);

	dh->len = dh->private_len;
	dh->data = dh->private_buffer;
	dh->writepos = dh->len;
	dh->type = GPGME_DATA_TYPE_MEM;

	*r_dh = dh;
	return 0;
	}


	/**
	* gpgme_data_release:
	* @dh: Data object
	*
	* Release the data object @dh. @dh may be NULL in which case nothing
	* happens.
	**/
	void
	gpgme_data_release ( GpgmeData dh )
	{
	if (dh) {
	xfree (dh->private_buffer);
	xfree (dh);
	}
	}

	char *
	_gpgme_data_release_and_return_string ( GpgmeData dh )
	{
	char *val = NULL;

	if (dh) {
	if ( _gpgme_data_append ( dh, "", 0 ) ) /* append EOS */
	xfree (dh->private_buffer );
	else {
	val = dh->private_buffer;
	if ( !val && dh->data ) {
	val = xtrymalloc ( dh->len );
	if ( val )
	memcpy ( val, dh->data, dh->len );
	}
	}
	xfree (dh);
	}
	return val;
	}

	/**
	* gpgme_data_release_and_get_mem:
	* @dh: the data object
	* @r_len: returns the length of the memory
	*
	* Release the data object @dh and return its content and the length of
	* that content. The caller has to free this data. @dh maybe NULL in
	* which case NULL is returned. I there is not enough memory for allocating
	* the return value, NULL is returned and the object is released.
	*
	* Return value: a pointer to an allocated buffer of length @r_len.
	**/
	char *
	gpgme_data_release_and_get_mem ( GpgmeData dh, size_t *r_len )
	{
	char *val = NULL;

	if (r_len)
	*r_len = 0;
	if (dh) {
	size_t len = dh->len;
	val = dh->private_buffer;
	if ( !val && dh->data ) {
	val = xtrymalloc ( len );
	if ( val )
	memcpy ( val, dh->data, len );
	}
	xfree (dh);
	if (val && r_len )
	*r_len = len;
	}
	return val;
	}


	/**
	* gpgme_data_get_type:
	* @dh: the data object
	*
	* Get the type of the data object.
	* Data types are prefixed with %GPGME_DATA_TYPE_
	*
	* Return value: the data type
	**/
	GpgmeDataType
	gpgme_data_get_type ( GpgmeData dh )
	{
	if ( !dh \|\| (!dh->data && !dh->read_cb))
	return GPGME_DATA_TYPE_NONE;

	return dh->type;
	}

	void
	_gpgme_data_set_mode ( GpgmeData dh, GpgmeDataMode mode )
	{
	assert (dh);
	dh->mode = mode;
	}


	GpgmeDataMode
	_gpgme_data_get_mode ( GpgmeData dh )
	{
	assert (dh);
	return dh->mode;
	}

	/**
	* gpgme_data_rewind:
	* @dh: the data object
	*
	* Prepare the data object in a way, that a gpgme_data_read() does start
	* at the beginning of the data. This has to be done for all types
	* of data objects.
	*
	* Return value: An error code or 0 on success
	**/
	GpgmeError
	gpgme_data_rewind ( GpgmeData dh )
	{
	if ( !dh )
	return mk_error (Invalid_Value);

	if ( dh->type == GPGME_DATA_TYPE_NONE
	\|\| dh->type == GPGME_DATA_TYPE_MEM ) {
	dh->readpos = 0;
	}
	else if (dh->type == GPGME_DATA_TYPE_CB) {
	dh->len = dh->readpos = 0;
	dh->read_cb_eof = 0;
	/* FIXME: do a special call to the read function to trigger a rewind
	there */
	}
	else
	return mk_error (General_Error);
	return 0;
	}

	/**
	* gpgme_data_read:
	* @dh: the data object
	* @buffer: A buffer
	* @length: The length of that bufer
	* @nread: Returns the number of bytes actually read.
	*
	* Copy data from the current read position (which may be set by
	* gpgme_data_rewind()) to the supplied @buffer, max. @length bytes
	* are copied and the actual number of bytes are returned in @nread.
	* If there are no more bytes available %GPGME_EOF is returned and @nread
	* is set to 0.
	*
	* Return value: An errorcode or 0 on success, EOF is indcated by the
	* error code GPGME_EOF.
	**/
	GpgmeError
	gpgme_data_read ( GpgmeData dh, char buffer, size_t length, size_t nread )
	{
	size_t nbytes;

	if ( !dh )
	return mk_error (Invalid_Value);
	if (dh->type == GPGME_DATA_TYPE_MEM ) {
	nbytes = dh->len - dh->readpos;
	if ( !nbytes ) {
	*nread = 0;
	return mk_error(EOF);
	}
	if (nbytes > length)
	nbytes = length;
	memcpy ( buffer, dh->data + dh->readpos, nbytes );
	*nread = nbytes;
	dh->readpos += nbytes;
	}
	else if (dh->type == GPGME_DATA_TYPE_CB) {
	nbytes = dh->len - dh->readpos;
	if ( nbytes ) {
	/* we have unread data - return this */
	if (nbytes > length)
	nbytes = length;
	memcpy ( buffer, dh->data + dh->readpos, nbytes );
	*nread = nbytes;
	dh->readpos += nbytes;
	}
	else { /* get the data from the callback */
	if (!dh->read_cb \|\| dh->read_cb_eof) {
	*nread = 0;
	return mk_error (EOF);
	}
	if (dh->read_cb (dh->read_cb_value, buffer, length, nread )) {
	*nread = 0;
	dh->read_cb_eof = 1;
	return mk_error (EOF);
	}
	}
	}
	else
	return mk_error (General_Error);
	return 0;
	}

	GpgmeError
	_gpgme_data_unread (GpgmeData dh, const char *buffer, size_t length )
	{
	if ( !dh )
	return mk_error (Invalid_Value);

	if (dh->type == GPGME_DATA_TYPE_MEM ) {
	/* check that we don't unread more than we have yet read */
	if ( dh->readpos < length )
	return mk_error (Invalid_Value);
	/* No need to use the buffer for this data type */
	dh->readpos -= length;
	}
	else {
	return mk_error (General_Error);
	}

	return 0;
	}


	/*
	* This function does make sense when we know that it contains no nil chars.
	*/
	char *
	_gpgme_data_get_as_string ( GpgmeData dh )
	{
	char *val = NULL;

	if (dh) {
	val = xtrymalloc ( dh->len+1 );
	if ( val ) {
	memcpy ( val, dh->data, dh->len );
	val[dh->len] = 0;
	}
	}
	return val;
	}


	/**
	* gpgme_data_write:
	* @dh: the context
	* @buffer: data to be written to the data object
	* @length: length o this data
	*
	* Write the content of @buffer to the data object @dh at the current write
	* position.
	*
	* Return value: 0 on succress or an errorcode
	**/
	GpgmeError
	gpgme_data_write ( GpgmeData dh, const char *buffer, size_t length )
	{
	if (!dh \|\| !buffer)
	return mk_error (Invalid_Value);

	return _gpgme_data_append (dh, buffer, length );
	}


	GpgmeError
	_gpgme_data_append ( GpgmeData dh, const char *buffer, size_t length )
	{
	assert (dh);

	if ( dh->type == GPGME_DATA_TYPE_NONE ) {
	/* convert it to a mem data type */
	assert (!dh->private_buffer);
	dh->type = GPGME_DATA_TYPE_MEM;
	dh->private_len = length < ALLOC_CHUNK? ALLOC_CHUNK : length;
	dh->private_buffer = xtrymalloc ( dh->private_len );
	if (!dh->private_buffer) {
	dh->private_len = 0;
	return mk_error (Out_Of_Core);
	}
	dh->writepos = 0;
	dh->data = dh->private_buffer;
	}
	else if ( dh->type != GPGME_DATA_TYPE_MEM )
	return mk_error (Invalid_Type);

	if ( dh->mode != GPGME_DATA_MODE_INOUT
	&& dh->mode != GPGME_DATA_MODE_IN )
	return mk_error (Invalid_Mode);

	if ( !dh->private_buffer ) {
	/* we have to copy it now */
	assert (dh->data);
	dh->private_len = dh->len+length;
	if (dh->private_len < ALLOC_CHUNK)
	dh->private_len = ALLOC_CHUNK;
	dh->private_buffer = xtrymalloc ( dh->private_len );
	if (!dh->private_buffer) {
	dh->private_len = 0;
	return mk_error (Out_Of_Core);
	}
	memcpy ( dh->private_buffer, dh->data, dh->len );
	dh->writepos = dh->len;
	dh->data = dh->private_buffer;
	}

	/* allocate more memory if needed */
	if ( dh->writepos + length > dh->private_len ) {
	char *p;
	size_t newlen = dh->private_len
	+ (dh->len < ALLOC_CHUNK? ALLOC_CHUNK : length);
	p = xtryrealloc ( dh->private_buffer, newlen );
	if ( !p )
	return mk_error (Out_Of_Core);
	dh->private_buffer = p;
	dh->private_len = newlen;
	dh->data = dh->private_buffer;
	assert ( !(dh->writepos + length > dh->private_len) );
	}

	memcpy ( dh->private_buffer + dh->writepos, buffer, length );
	dh->writepos += length;
	dh->len += length;

	return 0;
	}

	GpgmeError
	_gpgme_data_append_string ( GpgmeData dh, const char *s )
	{
	return _gpgme_data_append ( dh, s, s? strlen(s):0 );
	}


	GpgmeError
	_gpgme_data_append_for_xml ( GpgmeData dh,
	const char *buffer, size_t len )
	{
	const char text, s;
	size_t n;
	int rc = 0;

	if ( !dh \|\| !buffer )
	return mk_error (Invalid_Value);

	do {
	for (text=NULL, s=buffer, n=len; n && !text; s++, n-- ) {
	if ( *s == '<' )
	text = "<";
	else if ( *s == '>' )
	text = ">"; /* not sure whether this is really needed */
	else if ( *s == '&' )
	text = "&";
	else if ( !*s )
	text = "";
	}
	if (text) {
	s--; n++;
	}
	if (s != buffer)
	rc = _gpgme_data_append ( dh, buffer, s-buffer );
	if ( !rc && text) {
	rc = _gpgme_data_append_string ( dh, text );
	s++; n--;
	}
	buffer = s;
	len = n;
	} while ( !rc && len );
	return rc;
	}


	/*
	* Append a string to DATA and convert it so that the result will be
	* valid XML.
	*/
	GpgmeError
	_gpgme_data_append_string_for_xml ( GpgmeData dh, const char *string )
	{
	return _gpgme_data_append_for_xml ( dh, string, strlen (string) );
	}


	static int
	hextobyte( const byte *s )
	{
	int c;

	if( s >= '0' && s <= '9' )
	c = 16 * (*s - '0');
	else if( s >= 'A' && s <= 'F' )
	c = 16 * (10 + *s - 'A');
	else if( s >= 'a' && s <= 'f' )
	c = 16 * (10 + *s - 'a');
	else
	return -1;
	s++;
	if( s >= '0' && s <= '9' )
	c += *s - '0';
	else if( s >= 'A' && s <= 'F' )
	c += 10 + *s - 'A';
	else if( s >= 'a' && s <= 'f' )
	c += 10 + *s - 'a';
	else
	return -1;
	return c;
	}




	/*
	* Append a string with percent style (%XX) escape characters as XML
	*/
	GpgmeError
	_gpgme_data_append_percentstring_for_xml ( GpgmeData dh, const char *string )
	{
	const byte *s;
	byte buf, d;
	int val;
	GpgmeError err;

	d = buf = xtrymalloc ( strlen (string) );
	for (s=string; *s; s++ ) {
	if ( *s == '%' && (val=hextobyte (s+1)) != -1 ) {
	*d++ = val;
	s += 2;
	}
	else
	d++ = s;
	}

	err = _gpgme_data_append_for_xml ( dh, buf, d - buf );
	xfree (buf);
	return err;
	}

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