[vte] Revert "emulation: Implement DECRQCRA"

[Christian Persch <chpe src gnome org>]

commit 340233e40b96b69fb17ead2dea6d55e4a875993d
Author: Christian Persch <chpe src gnome org>
Date:   Tue Mar 27 19:40:12 2018 +0200

    Revert "emulation: Implement DECRQCRA"
    
    To avoid merge conflicts, this reverts
    commit cac7b40b507c8ef705c0d7a3c2fee8a4bc3ee6ef
    which will be re-implemented later on.

 src/caps-list.hh   |    2 -
 src/vte.cc         |   29 -----------------
 src/vteinternal.hh |    5 ---
 src/vteseq-list.hh |    1 -
 src/vteseq.cc      |   89 ----------------------------------------------------
 5 files changed, 0 insertions(+), 126 deletions(-)
---
diff --git a/src/caps-list.hh b/src/caps-list.hh
index cc7075c..8557bc2 100644
--- a/src/caps-list.hh
+++ b/src/caps-list.hh
@@ -300,8 +300,6 @@ static const vte_matcher_entry_t entries[] = {
         ENTRY(OSC "2L;%s" BEL, set_text_property_2L),
         ENTRY(OSC "21;%s" ST, set_text_property_21),
         ENTRY(OSC "2L;%s" ST, set_text_property_2L),
-
-        ENTRY(CSI "%m*y", checksum_rectangular_area),
 };
 
 #undef ENTRY
diff --git a/src/vte.cc b/src/vte.cc
index 9730ac8..30ade8f 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -6091,35 +6091,6 @@ VteTerminalPrivate::get_selected_text(GArray *attributes)
                         attributes);
 }
 
-#ifdef VTE_DEBUG
-unsigned int
-VteTerminalPrivate::checksum_area(vte::grid::row_t start_row,
-                                  vte::grid::column_t start_col,
-                                  vte::grid::row_t end_row,
-                                  vte::grid::column_t end_col)
-{
-        unsigned int checksum = 0;
-
-        auto text = get_text(start_row, start_col, end_row, end_col,
-                             true /* block */, false /* wrap */,
-                             true /* trailing whitespace */,
-                             nullptr /* not interested in attributes */);
-        if (text == nullptr)
-                return checksum;
-
-        char const* end = (char const*)text->str + text->len;
-        for (char const *p = text->str; p < end; p = g_utf8_next_char(p)) {
-                auto const c = g_utf8_get_char(p);
-                if (c == '\n')
-                        continue;
-                checksum += c;
-        }
-        g_string_free(text, true);
-
-        return checksum & 0xffff;
-}
-#endif /* VTE_DEBUG */
-
 /*
  * Compares the visual attributes of a VteCellAttr for equality, but ignores
  * attributes that tend to change from character to character or are otherwise
diff --git a/src/vteinternal.hh b/src/vteinternal.hh
index f813913..132e5c4 100644
--- a/src/vteinternal.hh
+++ b/src/vteinternal.hh
@@ -1346,11 +1346,6 @@ public:
                                          const char *osc,
                                          char const *terminator);
 
-        unsigned int checksum_area(vte::grid::row_t start_row,
-                                   vte::grid::column_t start_col,
-                                   vte::grid::row_t end_row,
-                                   vte::grid::column_t end_col);
-
         void subscribe_accessible_events();
         void select_text(vte::grid::column_t start_col,
                          vte::grid::row_t start_row,
diff --git a/src/vteseq-list.hh b/src/vteseq-list.hh
index daba388..a03d2bb 100644
--- a/src/vteseq-list.hh
+++ b/src/vteseq-list.hh
@@ -1,4 +1,3 @@
-SEQUENCE_HANDLER(checksum_rectangular_area)
 SEQUENCE_HANDLER(ansi_conformance_level_1)
 SEQUENCE_HANDLER(ansi_conformance_level_2)
 SEQUENCE_HANDLER(ansi_conformance_level_3)
diff --git a/src/vteseq.cc b/src/vteseq.cc
index 99b8bb3..7d3c5f9 100644
--- a/src/vteseq.cc
+++ b/src/vteseq.cc
@@ -189,95 +189,6 @@ VteTerminalPrivate::emit_resize_window(guint columns,
 
 /* Some common functions */
 
-void
-VteTerminalPrivate::seq_checksum_rectangular_area(vte::parser::Params const& params)
-{
-        /*
-         * DECRQCRA - request checksum of rectangular area
-         * Computes a simple checksum of the characters in the rectangular
-         * area. args[0] is an identifier, which the response must use.
-         * args[1] is the page number; if it's 0 or default then the
-         * checksum is computed over all pages; if it's greater than the
-         * number of pages, then the checksum is computed only over the
-         * last page. args[2]..args[5] describe the area to compute the
-         * checksum from, denoting the top, left, bottom, right, resp
-         * (1-based). It's required that top ≤ bottom, and left ≤ right.
-         * These coordinates are interpreted according to origin mode.
-         *
-         * NOTE: Since this effectively allows to read the screen
-         * (by using a 1x1 rectangle on each cell), we normally only
-         * send a dummy reply, and only reply with the actual checksum
-         * when in test mode.
-         *
-         * Defaults:
-         *   args[0]: no default
-         *   args[1]: 0
-         *   args[2]: 1
-         *   args[3]: no default (?)
-         *   args[4]: height of current page
-         *   args[5]: width of current page
-         *
-         * Reply: DECCKSR
-         *   @args[0]: the identifier from the request
-         *   DATA: the checksum as a 4-digit hex number
-         *
-         * References: VT525
-         *             XTERM
-         */
-
-        char buf[32];
-        gsize len;
-
-        int id = params.number_or_default_at(0, 0);
-
-#ifndef VTE_DEBUG
-        /* Send a dummy reply */
-        len = g_snprintf(buf, sizeof(buf), "\eP%d!~%04X\e\\", id, 0);
-        feed_child(buf, len);
-#else
-
-        /* Not in test mode? Send a dummy reply */
-        if (!g_test_mode) {
-                len = g_snprintf(buf, sizeof(buf), "\eP%d!~%04X\e\\", id, 0);
-                feed_child(buf, len);
-                return;
-        }
-
-        /* We only support 1 'page', so ignore args[1] */
-
-        int top = params.number_or_default_at(2, 1);
-        int left = params.number_or_default_at(3, 1); /* use 1 as default here */
-        int bottom = params.number_or_default_at(4, m_row_count);
-        int right = params.number_or_default_at(5, m_column_count);
-
-        top = CLAMP(top, 1, m_row_count);
-        left = CLAMP(left, 1, m_column_count);
-        bottom = CLAMP(bottom, 1, m_row_count);
-        right = CLAMP (right, 1, m_column_count);
-
-        if (m_origin_mode &&
-            m_scrolling_restricted) {
-                top += m_scrolling_region.start;
-
-                bottom += m_scrolling_region.start;
-                bottom = MIN(bottom, m_scrolling_region.end);
-
-        }
-
-        unsigned int checksum;
-        if (bottom < top || right < left)
-                checksum = 0; /* empty area */
-        else
-                checksum = checksum_area(top -1 + m_screen->insert_delta,
-                                         left - 1,
-                                         bottom - 1 + m_screen->insert_delta,
-                                         right - 1);
-
-        len = g_snprintf(buf, sizeof(buf), "\eP%d!~%04X\e\\", id, checksum);
-        feed_child(buf, len);
-#endif /* VTE_DEBUG */
-}
-
 /* In Xterm, upon printing a character in the last column the cursor doesn't
  * advance.  It's special cased that printing the following letter will first
  * wrap to the next row.