diff options
author | Richard Levitte <levitte@openssl.org> | 2020-10-05 14:23:55 +0200 |
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committer | Richard Levitte <levitte@openssl.org> | 2020-10-10 20:23:39 +0200 |
commit | 25cf949fc620ff7053e51acca3ec4d0fd094f8b0 (patch) | |
tree | dfbffa70ab45c5bad376f86ef518cd02eb38ca7a /crypto/encode_decode/encoder_lib.c | |
parent | 3094351625f0b222f92c22ce4943461df8c7e301 (diff) |
ENCODER / DECODER: Add functions to encode/decode to/from a buffer
This adds OSSL_ENCODER_to_data() and OSSL_DECODER_from_data(). These
functions allow fairly simple rewrites of type-specific i2d and d2i
calls.
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13094)
Diffstat (limited to 'crypto/encode_decode/encoder_lib.c')
-rw-r--r-- | crypto/encode_decode/encoder_lib.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/crypto/encode_decode/encoder_lib.c b/crypto/encode_decode/encoder_lib.c index 179c6d3dc3..6d3aa279d7 100644 --- a/crypto/encode_decode/encoder_lib.c +++ b/crypto/encode_decode/encoder_lib.c @@ -49,6 +49,54 @@ int OSSL_ENCODER_to_fp(OSSL_ENCODER_CTX *ctx, FILE *fp) } #endif +int OSSL_ENCODER_to_data(OSSL_ENCODER_CTX *ctx, unsigned char **pdata, + size_t *pdata_len) +{ + BIO *out = BIO_new(BIO_s_mem()); + BUF_MEM *buf = NULL; + int ret = 0; + + if (pdata_len == NULL) { + ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER); + return 0; + } + + if (OSSL_ENCODER_to_bio(ctx, out) + && BIO_get_mem_ptr(out, &buf) > 0) { + ret = 1; /* Hope for the best. A too small buffer will clear this */ + + if (pdata != NULL && *pdata != NULL) { + if (*pdata_len < buf->length) + /* + * It's tempting to do |*pdata_len = (size_t)buf->length| + * However, it's believed to be confusing more than helpful, + * so we don't. + */ + ret = 0; + else + *pdata_len -= buf->length; + } else { + /* The buffer with the right size is already allocated for us */ + *pdata_len = (size_t)buf->length; + } + + if (ret) { + if (pdata != NULL) { + if (*pdata != NULL) { + memcpy(*pdata, buf->data, buf->length); + *pdata += buf->length; + } else { + /* In this case, we steal the data from BIO_s_mem() */ + *pdata = (unsigned char *)buf->data; + buf->data = NULL; + } + } + } + } + BIO_free(out); + return ret; +} + int OSSL_ENCODER_CTX_set_output_type(OSSL_ENCODER_CTX *ctx, const char *output_type) { |