1 /* 2 * Copyright (C) 2004-2021 Exiv2 authors 3 * This program is part of the Exiv2 distribution. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * as published by the Free Software Foundation; either version 2 8 * of the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA. 18 */ 19 20 #include "image_int.hpp" 21 22 #include <cstdarg> 23 #include <cstddef> 24 #include <cstring> 25 #include <vector> 26 #include <cstdio> 27 28 namespace Exiv2 29 { 30 namespace Internal 31 { stringFormat(const char * format,...)32 std::string stringFormat(const char* format, ...) 33 { 34 std::string result; 35 std::vector<char> buffer; 36 size_t need = std::strlen(format)*8; // initial guess 37 int rc = -1; 38 39 // vsnprintf writes at most size (2nd parameter) bytes (including \0) 40 // returns the number of bytes required for the formatted string excluding \0 41 // the following loop goes through: 42 // one iteration (if 'need' was large enough for the for formatted string) 43 // or two iterations (after the first call to vsnprintf we know the required length) 44 do { 45 buffer.resize(need + 1); 46 va_list args; // variable arg list 47 va_start(args, format); // args start after format 48 rc = vsnprintf(&buffer[0], buffer.size(), format, args); 49 va_end(args); // free the args 50 assert(rc >= 0); // rc < 0 => we have made an error in the format string 51 if (rc > 0) 52 need = static_cast<size_t>(rc); 53 } while (buffer.size() <= need); 54 55 if (rc > 0) 56 result = std::string(&buffer[0], need); 57 return result; 58 } 59 binaryToHex(const byte * data,size_t size)60 std::string binaryToHex(const byte* data, size_t size) 61 { 62 std::stringstream hexOutput; 63 64 unsigned long tl = (unsigned long)((size / 16) * 16); 65 unsigned long tl_offset = (unsigned long)(size - tl); 66 67 for (unsigned long loop = 0; loop < (unsigned long)size; loop++) { 68 if (data[loop] < 16) { 69 hexOutput << "0"; 70 } 71 hexOutput << std::hex << (int)data[loop]; 72 if ((loop % 8) == 7) { 73 hexOutput << " "; 74 } 75 if ((loop % 16) == 15 || loop == (tl + tl_offset - 1)) { 76 int max = 15; 77 if (loop >= tl) { 78 max = tl_offset - 1; 79 for (int offset = 0; offset < (int)(16 - tl_offset); offset++) { 80 if ((offset % 8) == 7) { 81 hexOutput << " "; 82 } 83 hexOutput << " "; 84 } 85 } 86 hexOutput << " "; 87 for (int offset = max; offset >= 0; offset--) { 88 if (offset == (max - 8)) { 89 hexOutput << " "; 90 } 91 byte c = '.'; 92 if (data[loop - offset] >= 0x20 && data[loop - offset] <= 0x7E) { 93 c = data[loop - offset]; 94 } 95 hexOutput << (char)c; 96 } 97 hexOutput << std::endl; 98 } 99 } 100 101 hexOutput << std::endl << std::endl << std::endl; 102 103 return hexOutput.str(); 104 } 105 indent(int32_t d)106 std::string indent(int32_t d) 107 { 108 std::string result; 109 if (d > 0) 110 while (d--) 111 result += " "; 112 return result; 113 } 114 115 } // namespace Internal 116 117 } // namespace Exiv2 118