1// 2// der_string.c 3// utilities 4// 5// Created by Mitch Adler on 6/18/12. 6// Copyright (c) 2012 Apple Inc. All rights reserved. 7// 8 9#include <stdio.h> 10 11#include "utilities/SecCFRelease.h" 12#include "utilities/der_plist.h" 13#include "utilities/der_plist_internal.h" 14 15#include <corecrypto/ccder.h> 16#include <CoreFoundation/CoreFoundation.h> 17 18 19const uint8_t* der_decode_string(CFAllocatorRef allocator, CFOptionFlags mutability, 20 CFStringRef* string, CFErrorRef *error, 21 const uint8_t* der, const uint8_t *der_end) 22{ 23 if (NULL == der) 24 return NULL; 25 26 size_t payload_size = 0; 27 const uint8_t *payload = ccder_decode_tl(CCDER_UTF8_STRING, &payload_size, der, der_end); 28 29 if (NULL == payload || (der_end - payload) < payload_size){ 30 SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown string encoding"), NULL, error); 31 return NULL; 32 } 33 34 *string = CFStringCreateWithBytes(allocator, payload, payload_size, kCFStringEncodingUTF8, false); 35 36 if (NULL == *string) { 37 SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("String allocation failed"), NULL, error); 38 return NULL; 39 } 40 41 return payload + payload_size; 42} 43 44 45size_t der_sizeof_string(CFStringRef str, CFErrorRef *error) 46{ 47 const CFIndex str_length = CFStringGetLength(str); 48 const CFIndex maximum = CFStringGetMaximumSizeForEncoding(str_length, kCFStringEncodingUTF8); 49 50 CFIndex encodedLen = 0; 51 CFIndex converted = CFStringGetBytes(str, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, NULL, maximum, &encodedLen); 52 53 return ccder_sizeof(CCDER_UTF8_STRING, (converted == str_length) ? encodedLen : 0); 54} 55 56 57uint8_t* der_encode_string(CFStringRef string, CFErrorRef *error, 58 const uint8_t *der, uint8_t *der_end) 59{ 60 // Obey the NULL allowed rules. 61 if (!der_end) 62 return NULL; 63 64 const CFIndex str_length = CFStringGetLength(string); 65 66 ptrdiff_t der_space = der_end - der; 67 CFIndex bytes_used = 0; 68 uint8_t *buffer = der_end - der_space; 69 CFIndex converted = CFStringGetBytes(string, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, buffer, der_space, &bytes_used); 70 if (converted != str_length){ 71 SecCFDERCreateError(kSecDERErrorUnderlyingError, CFSTR("String extraction failed"), NULL, error); 72 return NULL; 73 } 74 75 return ccder_encode_tl(CCDER_UTF8_STRING, bytes_used, der, 76 ccder_encode_body(bytes_used, buffer, der, der_end)); 77 78} 79