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PDF: Allow word_wrap_stream to split hex strings

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This commit is contained in:
Adrian Johnson 2008-02-16 20:37:16 +10:30
parent 204a27aadb
commit 357f2334f0
1 changed files with 44 additions and 6 deletions
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50
src/cairo-pdf-operators.c
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@ -107,6 +107,7 @@ typedef struct _word_wrap_stream {
int max_column;
int column;
cairo_bool_t last_write_was_space;
cairo_bool_t in_hexstring;
} word_wrap_stream_t;
static int
@ -115,7 +116,28 @@ _count_word_up_to (const unsigned char *s, int length)
int word = 0;
while (length--) {
if (! isspace (*s++))
if (! (isspace (*s) || *s == '<')) {
s++;
word++;
} else {
return word;
}
}
return word;
}
/* Count up to either the end of the ASCII hexstring or the number
* of columns remaining.
*/
static int
_count_hexstring_up_to (const unsigned char *s, int length, int columns)
{
int word = 0;
while (length-- && columns--) {
if (*s++ != '>')
word++;
else
return word;
@ -134,7 +156,17 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
int word;
while (length) {
if (isspace (*data)) {
if (*data == '<') {
stream->in_hexstring = TRUE;
data++;
length--;
_cairo_output_stream_printf (stream->output, "<");
} else if (*data == '>') {
stream->in_hexstring = FALSE;
data++;
length--;
_cairo_output_stream_printf (stream->output, ">");
} else if (isspace (*data)) {
newline = (*data == '\n' || *data == '\r');
if (! newline && stream->column >= stream->max_column) {
_cairo_output_stream_printf (stream->output, "\n");
@ -149,11 +181,16 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
stream->column++;
stream->last_write_was_space = TRUE;
} else {
word = _count_word_up_to (data, length);
/* Don't wrap if this word is a continuation of a word
* from a previous call to write. */
if (stream->in_hexstring) {
word = _count_hexstring_up_to (data, length,
MAX (stream->max_column - stream->column, 0));
} else {
word = _count_word_up_to (data, length);
}
/* Don't wrap if this word is a continuation of a non hex
* string word from a previous call to write. */
if (stream->column + word >= stream->max_column &&
stream->last_write_was_space)
(stream->last_write_was_space || stream->in_hexstring))
{
_cairo_output_stream_printf (stream->output, "\n");
stream->column = 0;
@ -198,6 +235,7 @@ _word_wrap_stream_create (cairo_output_stream_t *output, int max_column)
stream->max_column = max_column;
stream->column = 0;
stream->last_write_was_space = FALSE;
stream->in_hexstring = FALSE;
return &stream->base;
}