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libbacktrace: support multiple zstd frames

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Based on patch by GitHub user ofats.

	* elf.c (elf_zstd_decompress_frame): New static function,
	broken out of elf_zstd_decompress.
	(elf_zstd_decompress): Call elf_zstd_decompress_frame in a loop.
	* zstdtest.c (test_large): Compress the file in chunks.
This commit is contained in:
Ian Lance Taylor
2026-05-03 17:58:32 -07:00
parent ab3c042b80
commit 96664e69b1
2 changed files with 80 additions and 24 deletions
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45
zstdtest.c
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@@ -297,8 +297,8 @@ test_large (struct backtrace_state *state ATTRIBUTE_UNUSED)
size_t orig_bufsize;
size_t i;
char *compressed_buf;
size_t compressed_bufsize;
size_t compressed_size;
size_t chunk_size;
unsigned char *uncompressed_buf;
size_t r;
clockid_t cid;
@@ -370,22 +370,39 @@ test_large (struct backtrace_state *state ATTRIBUTE_UNUSED)
return;
}
compressed_bufsize = ZSTD_compressBound (orig_bufsize);
compressed_buf = malloc (compressed_bufsize);
if (compressed_buf == NULL)
{
perror ("malloc");
goto fail;
}
/* Split the input into 100K chunks. This is to approximate the fact that lld
splits the input into 1M shards. */
r = ZSTD_compress (compressed_buf, compressed_bufsize,
orig_buf, orig_bufsize, 3);
if (ZSTD_isError (r))
compressed_size = 0;
compressed_buf = NULL;
chunk_size = 100 << 10;
for (i = 0; i < orig_bufsize; i += chunk_size)
{
fprintf (stderr, "zstd compress failed: %s\n", ZSTD_getErrorName (r));
goto fail;
size_t chunk_input_size;
size_t chunk_compressed_size;
chunk_input_size = orig_bufsize - i;
if (chunk_input_size > chunk_size)
chunk_input_size = chunk_size;
chunk_compressed_size = ZSTD_compressBound (chunk_input_size);
compressed_buf = realloc (compressed_buf, compressed_size + chunk_compressed_size);
if (compressed_buf == NULL)
{
perror ("realloc");
goto fail;
}
r = ZSTD_compress (compressed_buf + compressed_size,
chunk_compressed_size,
orig_buf + i, chunk_input_size, 3);
if (ZSTD_isError (r))
{
fprintf (stderr, "zstd compress failed: %s\n", ZSTD_getErrorName (r));
goto fail;
}
compressed_size += r;
}
compressed_size = r;
uncompressed_buf = malloc (orig_bufsize);
if (uncompressed_buf == NULL)