diff options
Diffstat (limited to 'src/core/transport/metadata.c')
| -rw-r--r-- | src/core/transport/metadata.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/src/core/transport/metadata.c b/src/core/transport/metadata.c index f92e87e9dd..3fd21a2f5d 100644 --- a/src/core/transport/metadata.c +++ b/src/core/transport/metadata.c @@ -681,16 +681,34 @@ void grpc_mdctx_locked_mdelem_unref(grpc_mdctx *ctx, void grpc_mdctx_unlock(grpc_mdctx *ctx) { unlock(ctx); } -int grpc_mdstr_is_legal_header(grpc_mdstr *s) { - /* TODO(ctiller): consider caching this, or computing it on construction */ +static int conforms_to(grpc_mdstr *s, const gpr_uint8 *legal_bits) { const gpr_uint8 *p = GPR_SLICE_START_PTR(s->slice); const gpr_uint8 *e = GPR_SLICE_END_PTR(s->slice); for (; p != e; p++) { - if (*p < 32 || *p > 126) return 0; + int idx = *p; + int byte = idx / 8; + int bit = idx % 8; + if ((legal_bits[byte] & (1 << bit)) == 0) return 0; } return 1; } +int grpc_mdstr_is_legal_header(grpc_mdstr *s) { + static const gpr_uint8 legal_header_bits[256 / 8] = { + 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0xff, 0x03, 0x00, 0x00, 0x00, + 0x80, 0xfe, 0xff, 0xff, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; + return conforms_to(s, legal_header_bits); +} + +int grpc_mdstr_is_legal_nonbin_header(grpc_mdstr *s) { + static const gpr_uint8 legal_header_bits[256 / 8] = { + 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; + return conforms_to(s, legal_header_bits); +} + int grpc_mdstr_is_bin_suffixed(grpc_mdstr *s) { /* TODO(ctiller): consider caching this */ return grpc_is_binary_header((const char *)GPR_SLICE_START_PTR(s->slice), |