101 lines
3.0 KiB
Diff
101 lines
3.0 KiB
Diff
From 3dd0e308cbd2c24fde2fc9e9b707181252a2de95 Mon Sep 17 00:00:00 2001
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From: "Christoph M. Becker" <cmbecker69@gmx.de>
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Date: Tue, 5 May 2020 12:02:45 +0200
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Subject: [PATCH] Fix #615: gdImageStringFT() fails for empty strings as of
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libgd 2.3.0 (#633)
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We change the return type of `textLayout()` to `ssize_t`, and signal
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failure by returning `-1`, so that laying out an empty string is no
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longer handled as failure. We make sure that no overflow occurs,
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assuming that all `int` values can be fully represented as `ssize_t`.
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---
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src/gdft.c | 18 +++++++++---------
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tests/gdimagestringft/.gitignore | 1 +
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tests/gdimagestringft/CMakeLists.txt | 1 +
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tests/gdimagestringft/Makemodule.am | 1 +
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tests/gdimagestringft/bug00615.c | 25 +++++++++++++++++++++++++
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5 files changed, 37 insertions(+), 9 deletions(-)
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create mode 100644 tests/gdimagestringft/bug00615.c
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diff --git a/src/gdft.c b/src/gdft.c
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index b483b383..186eefff 100644
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--- a/src/gdft.c
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+++ b/src/gdft.c
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@@ -441,7 +441,7 @@ typedef struct {
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uint32_t cluster;
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} glyphInfo;
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-static size_t
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+static ssize_t
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textLayout(uint32_t *text, int len,
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FT_Face face, gdFTStringExtraPtr strex,
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glyphInfo **glyph_info)
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@@ -459,19 +459,19 @@ textLayout(uint32_t *text, int len,
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!raqm_set_par_direction (rq, RAQM_DIRECTION_DEFAULT) ||
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!raqm_layout (rq)) {
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raqm_destroy (rq);
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- return 0;
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+ return -1;
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}
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glyphs = raqm_get_glyphs (rq, &count);
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if (!glyphs) {
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raqm_destroy (rq);
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- return 0;
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+ return -1;
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}
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info = (glyphInfo*) gdMalloc (sizeof (glyphInfo) * count);
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if (!info) {
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raqm_destroy (rq);
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- return 0;
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+ return -1;
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}
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for (i = 0; i < count; i++) {
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@@ -489,7 +489,7 @@ textLayout(uint32_t *text, int len,
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FT_Error err;
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info = (glyphInfo*) gdMalloc (sizeof (glyphInfo) * len);
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if (!info) {
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- return 0;
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+ return -1;
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}
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for (count = 0; count < len; count++) {
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/* Convert character code to glyph index */
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@@ -508,7 +508,7 @@ textLayout(uint32_t *text, int len,
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err = FT_Load_Glyph (face, glyph_index, FT_LOAD_DEFAULT);
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if (err) {
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gdFree (info);
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- return 0;
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+ return -1;
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}
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info[count].index = glyph_index;
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info[count].x_offset = 0;
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@@ -527,7 +527,7 @@ textLayout(uint32_t *text, int len,
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#endif
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*glyph_info = info;
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- return count;
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+ return count <= SSIZE_MAX ? count : -1;
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}
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/********************************************************************/
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@@ -1108,7 +1108,7 @@ BGD_DECLARE(char *) gdImageStringFTEx (gdImage * im, int *brect, int fg, const c
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char *tmpstr = 0;
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uint32_t *text;
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glyphInfo *info = NULL;
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- size_t count;
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+ ssize_t count;
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int render = (im && (im->trueColor || (fg <= 255 && fg >= -255)));
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FT_BitmapGlyph bm;
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/* 2.0.13: Bob Ostermann: don't force autohint, that's just for testing
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@@ -1409,7 +1409,7 @@ BGD_DECLARE(char *) gdImageStringFTEx (gdImage * im, int *brect, int fg, const c
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count = textLayout (text , i, face, strex, &info);
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- if (!count) {
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+ if (count < 0) {
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gdFree (text);
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gdFree (tmpstr);
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gdCacheDelete (tc_cache);
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