diff options
Diffstat (limited to 'src/StringUtils.cpp')
| -rw-r--r-- | src/StringUtils.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/StringUtils.cpp b/src/StringUtils.cpp index 656b511..57c30d4 100644 --- a/src/StringUtils.cpp +++ b/src/StringUtils.cpp @@ -1,5 +1,7 @@ #include "../include/StringUtils.hpp" #include <string.h> +#include <fcntl.h> +#include <unistd.h> namespace QuickMedia { template <typename T> @@ -333,4 +335,29 @@ namespace QuickMedia { return result; } + + bool generate_random_characters(char *buffer, int buffer_size, const char *alphabet, size_t alphabet_size) { + if(alphabet_size == 0) + return false; + + int fd = open("/dev/urandom", O_RDONLY); + if(fd == -1) { + perror("/dev/urandom"); + return false; + } + + if(read(fd, buffer, buffer_size) < buffer_size) { + fprintf(stderr, "Failed to read %d bytes from /dev/urandom\n", buffer_size); + close(fd); + return false; + } + + for(int i = 0; i < buffer_size; ++i) { + unsigned char c = *(unsigned char*)&buffer[i]; + buffer[i] = alphabet[c % alphabet_size]; + } + + close(fd); + return true; + } }
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