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Added parameter 'columns' to base64_encode() to add optional line breaks 

2005-04-18  Raphael Quinet  <raphael@gimp.org>

	* plug-ins/metadata/base64.[ch]: Added parameter 'columns' to
	base64_encode() to add optional line breaks in the output.
	Improved documentation.
This commit is contained in:
Raphael Quinet 2005-04-18 05:06:48 +00:00 committed by Raphaël Quinet
parent 5c1b759a42
commit c9979abf5f
3 changed files with 76 additions and 15 deletions
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8
ChangeLog
View File

@ -1,3 +1,9 @@
2005-04-18 Raphaël Quinet <raphael@gimp.org>
* plug-ins/metadata/base64.[ch]: Added parameter 'columns' to
base64_encode() to add optional line breaks in the output.
Improved documentation.
2005-04-17 Sven Neumann <sven@gimp.org>
* plug-ins/helpbrowser/dialog.c: workaround a GTK+ bug to make the
@ -420,7 +426,7 @@
* plug-ins/metadata/base64.h
* plug-ins/metadata/base64.c: Added implementation of
base64_decode(), use gsize or gssize for sizes.
base64_encode(), use gsize or gssize for sizes.
2005-04-11 Raphaël Quinet <raphael@gimp.org>

80
plug-ins/metadata/base64.c
View File

@ -18,12 +18,13 @@
* Boston, MA 02111-1307, USA.
*/
/* Yet another implementation of base64 decoding. I ended up writing this
* because most of the implementations that I found required a null-terminated
* buffer, some of the others did not ignore whitespace (especially those
* written for HTTP usage) and the rest were not compatible with the LGPL. Or
* at least I haven't been able to find LGPL implementations. Writing this
* according to RFC 1521 did not take long anyway.
/* Yet another implementation of base64 encoding and decoding. I
* ended up writing this because most of the implementations that I
* found required a null-terminated buffer, some of the others did not
* ignore whitespace (especially those written for HTTP usage) and the
* rest were not compatible with the LGPL (some were GPL, not LGPL).
* Or at least I haven't been able to find LGPL implementations.
* Writing this according to RFC 1521 did not take long anyway.
*/
#ifndef WITHOUT_GIMP
@ -67,10 +68,27 @@ static const gint base64_6bits[256] =
-3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3
}; /* -1: skip whitespace, -2: end of input, -3: error */
/*
* FIXME: update this comment...
* - dest_size should be at least 3/4 of strlen (src) minus all CRLF
* - returns the number of bytes stored in dest
/**
* base64_decode:
* @src_b64: input buffer containing base64-encoded data
* @src_size: input buffer size (in bytes) or -1 if @src_b64 is nul-terminated
* @dest: buffer in which the decoded data should be stored
* @dest_size: size of the destination buffer
*
* Read base64-encoded data from the input buffer @src_b64 and write
* the decoded data into @dest.
*
* The base64 encoding uses 4 bytes for every 3 bytes of input, so
* @dest_size should be at least 3/4 of @src_size (or less if the
* input contains whitespace characters). The base64 encoding has no
* reliable EOF marker, so this can cause additional data following
* the base64-encoded block to be misinterpreted if @src_size is not
* specified correctly. The decoder will stop at the first nul byte
* or at the first '=' (padding byte) so you should ensure that one of
* these is present if you supply -1 for @src_size. For more details
* about the base64 encoding, see RFC 1521.
*
* Returns: the number of bytes stored in @dest, or -1 if invalid data was found.
*/
gssize
base64_decode (const gchar *src_b64,
@ -88,7 +106,7 @@ base64_decode (const gchar *src_b64,
decoded = 0;
n = 0;
bits = 0;
for (i = 0; (src_size > 0) && (i + 3 <= dest_size); src_b64++, src_size--)
for (i = 0; (src_size != 0) && (i + 3 <= dest_size); src_b64++, src_size--)
{
bits = base64_6bits[(int) *src_b64 & 0xff];
if (bits < 0)
@ -128,22 +146,47 @@ base64_decode (const gchar *src_b64,
return i;
}
/**
* base64_encode:
* @src: input buffer
* @src_size: input buffer size (in bytes) or -1 if @src is nul-terminated
* @dest_b64: buffer in which the base64 encoded data should be stored
* @dest_size: size of the destination buffer
* @columns: if > 0, add line breaks in the output after this many columns
*
* Read binary data from the input buffer @src and write
* base64-encoded data into @dest_b64.
*
* Since the base64 encoding uses 4 bytes for every 3 bytes of input,
* @dest_size should be at least 4/3 of @src_size, plus optional line
* breaks if @columns > 0 and up to two padding bytes at the end. For
* more details about the base64 encoding, see RFC 1521.
*
* Returns: the number of bytes stored in @dest.
*/
/*
* FIXME: docs!
* if columns <= 0, no line breaks
*/
gssize
base64_encode (const gchar *src,
gsize src_size,
gchar *dest_b64,
gsize dest_size)
gsize dest_size,
gint columns)
{
gint32 bits;
gssize i;
gint n;
gint c;
g_return_val_if_fail (src != NULL, -1);
g_return_val_if_fail (dest_b64 != NULL, -1);
n = 0;
bits = 0;
for (i = 0; (src_size > 0) && (i + 4 <= dest_size); src++, src_size--)
c = 0;
for (i = 0; (src_size != 0) && (i + 4 <= dest_size); src++, src_size--)
{
bits += *src;
if (++n == 3)
@ -154,6 +197,15 @@ base64_encode (const gchar *src,
dest_b64[i++] = base64_code[bits & 0x3f];
bits = 0;
n = 0;
if (columns > 0)
{
c += 4;
if ((c >= columns) && (i < dest_size))
{
dest_b64[i++] = '\n';
c = 0;
}
}
}
else
{
@ -177,6 +229,8 @@ base64_encode (const gchar *src,
dest_b64[i++] = '=';
}
}
if ((columns > 0) && ((c != 0) || (n != 0)) && (i + 1 < dest_size))
dest_b64[i++] = '\n';
if (i < dest_size)
dest_b64[i] = 0;
return i;

3
plug-ins/metadata/base64.h
View File

@ -33,7 +33,8 @@ gssize base64_decode (const gchar *src_b64,
gssize base64_encode (const gchar *src,
gsize src_size,
gchar *dest_b64,
gsize dest_size);
gsize dest_size,
gint columns);
G_END_DECLS