{"id":16593,"date":"2022-10-20T15:07:41","date_gmt":"2022-10-20T09:37:41","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-save-pbm-ascii-to-pbm-binary-c\/"},"modified":"2022-10-20T15:07:41","modified_gmt":"2022-10-20T09:37:41","slug":"solved-save-pbm-ascii-to-pbm-binary-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-save-pbm-ascii-to-pbm-binary-c\/","title":{"rendered":"[Solved] Save pbm ascii to pbm binary c++"},"content":{"rendered":"

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This seems to work for the files I was able to find to test it with.<\/p>\n

#include <iostream>\n#include <fstream>\n#include <string>\n#include <vector>\n\nstruct PBM\n{\n    unsigned int width;\n    unsigned int height;\n    std::string comment;\n    std::vector<std::vector<char>> data;\n\n    bool ReadAscii(std::ifstream& f)\n    {\n        std::string id;\n        if(!std::getline(f, id) || id != \"P1\")\n        {\n            return false;\n        }\n        if(f.peek() == '#' && !std::getline(f, comment))\n        {\n            return false;\n        }\n        if(!(f >> width >> height))\n        {\n            return false;\n        }\n        data.resize(height);\n        int temp;\n        for(size_t y = 0; y < data.size(); ++y)\n        {\n            data[y].resize(width);\n            for(size_t x = 0; x < width; ++x)\n            {\n                if(!(f >> temp))\n                {\n                    return false;\n                }\n                data[y][x] = static_cast<char>(temp);\n            }\n        }\n        return true;\n    }\n\n    bool WriteBinary(std::ofstream& f)\n    {\n        if(!(f << \"P4\\n\"))\n        {\n            return false;\n        }\n        if(!comment.empty() && !(f << comment << \"\\n\"))\n        {\n            return false;\n        }\n        if(!(f << width << \" \" << height << \"\\n\"))\n        {\n            return false;\n        }\n        std::vector<char> linebits((width + (CHAR_BIT - 1)) \/ CHAR_BIT);\n        for(size_t y = 0; y < data.size(); ++y)\n        {\n            std::fill(linebits.begin(), linebits.end(), 0);\n            for(size_t x = 0; x < width; ++x)\n            {\n                const int byte_pos = x \/ CHAR_BIT;\n                const int bit_pos = (CHAR_BIT - 1) - (x % CHAR_BIT);\n                linebits[byte_pos] |= (data[y][x] << bit_pos);\n            }\n            if(!f.write(&linebits[0], linebits.size()))\n            {\n                return false;\n            }\n        }\n        return true;\n    }\n};\n\nint main(int argc, char * argv[])\n{\n    if(argc != 3)\n    {\n        std::cerr << \"Usage: convertpbm <ascii filename> <binary filename>\\n\";\n        return 0;\n    }\n\n    PBM pbm;\n\n    std::ifstream inFile(argv[1]);\n    if(!inFile)\n    {\n        std::cerr << \"Could not open '\" << argv[1] << \"' for input!\\n\";\n        return 0;\n    }\n    if(!pbm.ReadAscii(inFile))\n    {\n        std::cerr << \"Error reading input file!\\n\";\n    }\n\n    std::ofstream outFile(argv[2], std::ios::binary);\n    if(!outFile)\n    {\n        std::cerr << \"Could not open '\" << argv[1] << \"' for output!\\n\";\n        return 0;\n    }\n    if(!pbm.WriteBinary(outFile))\n    {\n        std::cerr << \"Error writing output file!\\n\";\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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            3<\/span> <\/p><\/div>\n<\/div>\n
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solved Save pbm ascii to pbm binary c++ <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] This seems to work for the files I was able to find to test it with. #include <iostream> #include <fstream> #include <string> #include <vector> struct PBM { unsigned int width; unsigned int height; std::string comment; std::vector<std::vector<char>> data; bool ReadAscii(std::ifstream& f) { std::string id; if(!std::getline(f, id) || id != “P1”) { return false; } if(f.peek() … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,881],"class_list":["post-16593","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-image-processing"],"yoast_head":"\n[Solved] Save pbm ascii to pbm binary c++ - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-save-pbm-ascii-to-pbm-binary-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Save pbm ascii to pbm binary c++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This seems to work for the files I was able to find to test it with. #include <iostream> #include <fstream> #include <string> #include <vector> struct PBM { unsigned int width; unsigned int height; std::string comment; std::vector<std::vector<char>> data; bool ReadAscii(std::ifstream& f) { std::string id; if(!std::getline(f, id) || id != "P1") { return false; } if(f.peek() ... 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