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content_encoding: #error on too old zlib

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The previous runtime check using strcmp() risks failing when zlib
reaches 1.10. While this instead changes the logic to a cruder
build-time instead of runtime, it avoids the 1.10 risk.

I verified that ZLIB_VERNUM has been provided since at least the 1.2.0.3
release.

1.2.0.4 was released on 10 August 2003.

Reported-by: Fay Stegerman
Closes #16202
This commit is contained in:
Daniel Stenberg 2025-02-06 09:28:42 +01:00
parent 553248f501
commit 34acdf9986
No known key found for this signature in database
GPG Key ID: 5CC908FDB71E12C2
1 changed files with 7 additions and 12 deletions
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19
lib/content_encoding.c
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@ -69,6 +69,10 @@
#ifdef HAVE_LIBZ
#if !defined(ZLIB_VERNUM) || (ZLIB_VERNUM < 0x1204)
#error "requires zlib 1.2.0.4 or newer"
#endif
typedef enum {
ZLIB_UNINIT, /* uninitialized */
ZLIB_INIT, /* initialized */
@ -309,24 +313,15 @@ static CURLcode gzip_do_init(struct Curl_easy *data,
{
struct zlib_writer *zp = (struct zlib_writer *) writer;
z_stream *z = &zp->z; /* zlib state structure */
const char *v = zlibVersion();
/* Initialize zlib */
z->zalloc = (alloc_func) zalloc_cb;
z->zfree = (free_func) zfree_cb;
if(strcmp(v, "1.2.0.4") >= 0) {
/* zlib version >= 1.2.0.4 supports transparent gzip decompressing */
if(inflateInit2(z, MAX_WBITS + 32) != Z_OK) {
return process_zlib_error(data, z);
}
zp->zlib_init = ZLIB_INIT_GZIP; /* Transparent gzip decompress state */
}
else {
failf(data, "too old zlib version: %s", v);
return CURLE_FAILED_INIT;
}
if(inflateInit2(z, MAX_WBITS + 32) != Z_OK)
return process_zlib_error(data, z);
zp->zlib_init = ZLIB_INIT_GZIP; /* Transparent gzip decompress state */
return CURLE_OK;
}