forked from acouzens/open5gs
66 lines
3.5 KiB
Plaintext
66 lines
3.5 KiB
Plaintext
#include <stdlib.h>
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#include <string.h>
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#include "../include/binary.h"
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#ifdef OPENSSL
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#include "openssl/pem.h"
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#endif
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OpenAPI_binary_t *OpenAPI_instantiate_binary_t(char *data, int len)
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{
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binary_t* ret = malloc(sizeof(struct binary_t));
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ret->len=len;
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ret->data = malloc(len);
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memcpy(ret->data, data, len);
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return ret;
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}
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char *OpenAPI_base64encode(const void *b64_encode_this,
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int encode_this_many_bytes)
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{
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#ifdef OPENSSL
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BIO *b64_bio, *mem_bio; //Declares two OpenSSL BIOs: a base64 filter and a memory BIO.
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BUF_MEM *mem_bio_mem_ptr; //Pointer to a "memory BIO" structure holding our base64 data.
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b64_bio = BIO_new(BIO_f_base64()); //Initialize our base64 filter BIO.
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mem_bio = BIO_new(BIO_s_mem()); //Initialize our memory sink BIO.
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BIO_push(b64_bio, mem_bio); //Link the BIOs by creating a filter-sink BIO chain.
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BIO_set_flags(b64_bio, BIO_FLAGS_BASE64_NO_NL); //No newlines every 64 characters or less.
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BIO_write(b64_bio, b64_encode_this, encode_this_many_bytes); //Records base64 encoded data.
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BIO_flush(b64_bio); //Flush data. Necessary for b64 encoding, because of pad characters.
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BIO_get_mem_ptr(mem_bio, &mem_bio_mem_ptr); //Store address of mem_bio's memory structure.
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BIO_set_close(mem_bio, BIO_NOCLOSE); //Permit access to mem_ptr after BIOs are destroyed.
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BIO_free_all(b64_bio); //Destroys all BIOs in chain, starting with b64 (i.e. the 1st one).
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BUF_MEM_grow(mem_bio_mem_ptr, (*mem_bio_mem_ptr).length + 1); //Makes space for end null.
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(*mem_bio_mem_ptr).data[(*mem_bio_mem_ptr).length] = '\0'; //Adds null-terminator to tail.
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return (*mem_bio_mem_ptr).data; //Returns base-64 encoded data. (See: "buf_mem_st" struct).
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#else // OPENSSL
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#warning Data will not be encoded. If you want to use function "base64encode", please define "-DOPENSSL" when building the library.
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return NULL;
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#endif // OPENSSL
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}
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char *OpenAPI_base64decode(const void *b64_decode_this,
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int decode_this_many_bytes, int *decoded_bytes)
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{
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#ifdef OPENSSL
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BIO *b64_bio, *mem_bio; //Declares two OpenSSL BIOs: a base64 filter and a memory BIO.
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char *base64_decoded = calloc( (decode_this_many_bytes*3)/4+1, sizeof(char) ); //+1 = null.
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b64_bio = BIO_new(BIO_f_base64()); //Initialize our base64 filter BIO.
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mem_bio = BIO_new(BIO_s_mem()); //Initialize our memory source BIO.
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BIO_write(mem_bio, b64_decode_this, decode_this_many_bytes); //Base64 data saved in source.
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BIO_push(b64_bio, mem_bio); //Link the BIOs by creating a filter-source BIO chain.
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BIO_set_flags(b64_bio, BIO_FLAGS_BASE64_NO_NL); //Don't require trailing newlines.
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int decoded_byte_index = 0; //Index where the next base64_decoded byte should be written.
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while ( 0 < BIO_read(b64_bio, base64_decoded+decoded_byte_index, 1) ){ //Read byte-by-byte.
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decoded_byte_index++; //Increment the index until read of BIO decoded data is complete.
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} //Once we're done reading decoded data, BIO_read returns -1 even though there's no error.
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BIO_free_all(b64_bio); //Destroys all BIOs in chain, starting with b64 (i.e. the 1st one).
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*decoded_bytes = decoded_byte_index;
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return base64_decoded; //Returns base-64 decoded data with trailing null terminator.
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#else // OPENSSL
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#warning Data will not be decoded. If you want to use function "base64decode", please define "-DOPENSSL" when building the library.
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return NULL;
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#endif // OPENSSL
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}
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