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sixel: clamp max width/height in 'CSI ? 2 ; 3 ; W ; H S'

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This ensures the user cannot raise the maximum sixel size, where
width*height cannot be represented as an integer.

Note, we should consider moving all sixel width/height variables from
int to size_t. But, since it doesn't make any sense with overly large
sixel images, clamping the max width/height is enough. Add a
static_assert() that checks SIXEL_MAX_WIDTH * SIXEL_MAX_HEIGHT doesn't
overflow.

Closes #2343
This commit is contained in:
Daniel Eklöf 2026-05-22 11:18:15 +02:00
parent 4bf60d0fbc
commit 92187d2e4e
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3 changed files with 14 additions and 5 deletions
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8
sixel.h
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@ -2,10 +2,14 @@
#include "terminal.h"
#define SIXEL_MAX_COLORS 1024u
#define SIXEL_MAX_WIDTH 10000u
#define SIXEL_MAX_COLORS 1024u
#define SIXEL_MAX_WIDTH 10000u
#define SIXEL_MAX_HEIGHT 10000u
static_assert(SIXEL_MAX_WIDTH * SIXEL_MAX_HEIGHT ==
(size_t)SIXEL_MAX_WIDTH * SIXEL_MAX_HEIGHT,
"sixel max size triggers integer overflow");
typedef void (*sixel_put)(struct terminal *term, uint8_t c);
void sixel_fini(struct terminal *term);