245 lines
7.2 KiB
C++
245 lines
7.2 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 (see README.md for details)
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#include <assert.h>
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#include <string.h>
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#include "str_util.h"
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std::string base64_encode(const std::string &in)
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{
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std::string out;
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unsigned val = 0;
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int valb = -6;
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for (unsigned char c: in)
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{
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val = (val << 8) + c;
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valb += 8;
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while (valb >= 0)
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{
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out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[(val>>valb) & 0x3F]);
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valb -= 6;
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}
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}
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if (valb > -6)
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out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[((val<<8)>>(valb+8)) & 0x3F]);
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while (out.size() % 4)
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out.push_back('=');
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return out;
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}
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static char T[256] = { 0 };
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std::string base64_decode(const std::string &in)
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{
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std::string out;
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if (T[0] == 0)
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{
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for (int i = 0; i < 256; i++)
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T[i] = -1;
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for (int i = 0; i < 64; i++)
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T[(unsigned char)("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i])] = i;
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}
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unsigned val = 0;
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int valb = -8;
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for (unsigned char c: in)
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{
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if (T[c] == -1)
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break;
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val = (val<<6) + T[c];
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valb += 6;
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if (valb >= 0)
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{
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out.push_back(char((val >> valb) & 0xFF));
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valb -= 8;
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}
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}
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return out;
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}
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std::string strtolower(const std::string & in)
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{
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std::string s = in;
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for (int i = 0; i < s.length(); i++)
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{
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s[i] = tolower(s[i]);
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}
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return s;
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}
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std::string trim(const std::string & in, const char *rm_chars)
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{
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int begin = in.find_first_not_of(rm_chars);
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if (begin == -1)
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return "";
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int end = in.find_last_not_of(rm_chars);
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return in.substr(begin, end+1-begin);
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}
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std::string str_replace(const std::string & in, const std::string & needle, const std::string & replacement)
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{
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std::string res;
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int pos = 0, p2;
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while ((p2 = in.find(needle, pos)) >= 0)
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{
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res += in.substr(pos, p2-pos);
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res += replacement;
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pos = p2 + replacement.size();
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}
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if (!pos)
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{
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return in;
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}
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return res + in.substr(pos);
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}
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uint64_t stoull_full(const std::string & str, int base)
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{
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if (isspace(str[0]))
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{
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return 0;
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}
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char *end = NULL;
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uint64_t r = strtoull(str.c_str(), &end, base);
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if (end != str.c_str()+str.length())
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{
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return 0;
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}
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return r;
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}
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uint64_t parse_size(std::string size_str, bool *ok)
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{
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if (!size_str.length())
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{
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if (ok)
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*ok = false;
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return 0;
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}
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uint64_t mul = 1;
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char type_char = tolower(size_str[size_str.length()-1]);
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if (type_char == 'k' || type_char == 'm' || type_char == 'g' || type_char == 't')
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{
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if (type_char == 'k')
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mul = (uint64_t)1<<10;
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else if (type_char == 'm')
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mul = (uint64_t)1<<20;
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else if (type_char == 'g')
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mul = (uint64_t)1<<30;
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else /*if (type_char == 't')*/
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mul = (uint64_t)1<<40;
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size_str = size_str.substr(0, size_str.length()-1);
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}
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uint64_t size = stoull_full(size_str, 0) * mul;
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if (size == 0 && size_str != "0" && (size_str != "" || mul != 1))
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{
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if (ok)
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*ok = false;
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}
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return size;
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}
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static uint64_t size_thresh[] = { (uint64_t)1024*1024*1024*1024, (uint64_t)1024*1024*1024, (uint64_t)1024*1024, 1024, 0 };
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static uint64_t size_thresh_d[] = { (uint64_t)1000000000000, (uint64_t)1000000000, (uint64_t)1000000, (uint64_t)1000, 0 };
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static const int size_thresh_n = sizeof(size_thresh)/sizeof(size_thresh[0]);
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static const char *size_unit = "TGMKB";
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std::string format_size(uint64_t size, bool nobytes)
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{
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uint64_t *thr = nobytes ? size_thresh_d : size_thresh;
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char buf[256];
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for (int i = 0; i < size_thresh_n; i++)
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{
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if (size >= thr[i] || i >= size_thresh_n-1)
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{
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double value = thr[i] ? (double)size/thr[i] : size;
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int l = snprintf(buf, sizeof(buf), "%.1f", value);
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assert(l < sizeof(buf)-2);
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if (buf[l-1] == '0')
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l -= 2;
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buf[l] = i == size_thresh_n-1 && nobytes ? 0 : ' ';
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buf[l+1] = i == size_thresh_n-1 && nobytes ? 0 : size_unit[i];
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buf[l+2] = 0;
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break;
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}
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}
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return std::string(buf);
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}
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void print_help(const char *help_text, std::string exe_name, std::string cmd, bool all)
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{
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if (cmd == "" && all)
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{
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fwrite(help_text, strlen(help_text), 1, stdout);
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exit(0);
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}
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std::string filtered_text = "";
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const char *head_end = strstr(help_text, "COMMANDS:\n");
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if (head_end)
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{
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filtered_text += std::string(help_text, head_end-help_text);
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head_end += strlen("COMMANDS:\n");
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}
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const char *next_line = head_end ? head_end : help_text;
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if (cmd != "")
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{
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const char *cmd_start = NULL;
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bool matched = false, started = true, found = false;
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while ((next_line = strchr(next_line, '\n')))
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{
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next_line++;
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if (*next_line && !strncmp(next_line, exe_name.c_str(), exe_name.size()))
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{
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if (started)
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{
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if (cmd_start && matched)
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filtered_text += std::string(cmd_start, next_line-cmd_start);
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cmd_start = next_line;
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matched = started = false;
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}
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const char *var_start = next_line+exe_name.size()+1;
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const char *var_end = var_start;
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while (*var_end && !isspace(*var_end))
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var_end++;
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if ((std::string(var_start, var_end-var_start)+"|").find(cmd+"|") != std::string::npos)
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found = matched = true;
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}
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else if (*next_line && isspace(*next_line))
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started = true;
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else if (cmd_start && matched)
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filtered_text += std::string(cmd_start, next_line-cmd_start);
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}
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while (filtered_text.size() > 1 &&
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filtered_text[filtered_text.size()-1] == '\n' &&
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filtered_text[filtered_text.size()-2] == '\n')
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{
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filtered_text.resize(filtered_text.size()-1);
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}
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if (!found)
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{
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filtered_text = "Unknown command: "+cmd+". Use "+exe_name+" --help for usage\n";
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}
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}
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else
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{
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filtered_text += "COMMANDS:\n\n";
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while ((next_line = strchr(next_line, '\n')))
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{
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next_line++;
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if (*next_line && !strncmp(next_line, exe_name.c_str(), exe_name.size()))
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{
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const char *line_end = strchr(next_line, '\n');
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line_end = line_end ? line_end : next_line+strlen(next_line);
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filtered_text += " "+(line_end ? std::string(next_line, line_end-next_line) : std::string(next_line));
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filtered_text += "\n";
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}
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else if (*next_line && !isspace(next_line[0]))
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{
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filtered_text += "\n"+std::string(next_line);
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break;
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}
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}
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}
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fwrite(filtered_text.data(), filtered_text.size(), 1, stdout);
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exit(0);
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}
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