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Problem reported by Bruno Haible in:
https://lists.gnu.org/r/bug-gnulib/2021-08/msg00170.html
* lib/base32.c, lib/base64.c: Do not include verify.h,
and omit all uses of ‘assume’.
* modules/base32, modules/base64 (Depends-on): Remove verify.
* tests/test-base32.c, tests/test-base64.c:
Don’t pass out-of-range values to allocator,
as converting them to idx_t relies on implementation-defined
behavior that could trap.
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* lib/base32.c, lib/base64.c: Include ialloc.h instad of stdlib.h.
Include intprops.h, verify.h.
* lib/base32.c (base32_encode, base32_encode_alloc, get_8, decode_8)
(base32_decode_ctx, base32_decode_alloc_ctx):
* lib/base32.h (struct base32_decode_context):
* lib/base64.c (base64_encode_fast, base64_encode)
(base64_encode_alloc, get_4, decode_4, base64_decode_ctx)
(base64_decode_alloc_ctx):
* lib/base64.h (struct base64_decode_context):
* tests/test-base32.c (main):
* tests/test-base64.c (main):
Prefer signed to unsigned integers.
* lib/base32.c (base32_encode_alloc):
* lib/base64.c (base64_encode_alloc):
Use simpler and more-direct check for overflow, removing a TODO.
* lib/base32.h, lib/base64.h: Include idx.h instead of stddef.h.
* modules/base32, modules/base64 (Depends-on): Add ialloc, verify.
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