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/**
* @file mime.c
*/
#include "spm.h"
#include <fnmatch.h>
/**
* Execute OS `file` command
* @param _filename path to file
* @return Process structure
*/
Process *file_command(const char *_filename) {
char *filename = strdup(_filename);
Process *proc_info = NULL;
char sh_cmd[PATH_MAX];
sh_cmd[0] = '\0';
#if OS_DARWIN
const char *fmt_cmd = "file -I \"%s\" 2>&1";
#else // GNU
const char *fmt_cmd = "file -i \"%s\" 2>&1";
#endif
const char *fail_pattern = ": cannot open";
strchrdel(filename, SHELL_INVALID);
sprintf(sh_cmd, fmt_cmd, filename);
shell(&proc_info, SHELL_OUTPUT, sh_cmd);
// POSIXly ridiculous. Return non-zero when a file can't be found, or isn't accessible
if (strstr(proc_info->output, fail_pattern) != NULL) {
proc_info->returncode = 1;
}
free(filename);
return proc_info;
}
/**
* Execute the `file` command, parse its output, and return the data in a `Mime` structure
* @param filename path to file
* @return Mime structure
*/
Mime *file_mimetype(const char *filename) {
char **output = NULL;
char **parts = NULL;
Mime *type = NULL;
Process *proc = file_command(filename);
if (proc->returncode != 0) {
fprintf(stderr, "%s\n", proc->output);
fprintf(stderr, "file command returned: %d\n", proc->returncode);
fprintf(SYSERROR);
shell_free(proc);
return NULL;
}
#if OS_DARWIN
if (proc->output) {
// Universal binaries spit out multiple lines, but we only require the first
char *terminate_multi_part = strchr(proc->output, '\n');
if (terminate_multi_part != NULL) {
*(terminate_multi_part + 1) = '\0';
}
}
#endif
output = split(proc->output, ":");
if (!output || output[1] == NULL) {
shell_free(proc);
return NULL;
}
char *origin = NULL;
char *what = NULL;
char *charset = NULL;
if (strchr(output[1], ';')) {
parts = split(output[1], ";");
if (!parts || !parts[0] || !parts[1]) {
shell_free(proc);
return NULL;
}
what = strdup(parts[0]);
what = lstrip(what);
charset = strdup(strchr(parts[1], '=') + 1);
charset = lstrip(charset);
charset[strlen(charset) - 1] = '\0';
} else {
// this branch is for Darwin; the 'charset=' string is not guaranteed to exist using argument `-I`
what = strdup(output[1]);
what = lstrip(what);
what = strip(what);
if (strstr(output[1], "binary") != NULL) {
charset = strdup("binary");
}
}
origin = realpath(filename, NULL);
type = (Mime *)calloc(1, sizeof(Mime));
type->origin = origin;
type->type = what;
type->charset = charset;
split_free(output);
if (parts != NULL) {
split_free(parts);
}
shell_free(proc);
return type;
}
/**
* Free a `Mime` structure
* @param m
*/
void mime_free(Mime *m) {
if (m != NULL) {
free(m->origin);
free(m->type);
free(m->charset);
free(m);
}
}
/**
* Determine if a file is a text file
* @param filename
* @return yes=1, no=0
*/
int file_is_text(const char *filename) {
int result = 0;
char *path = normpath(filename);
Mime *type = file_mimetype(path);
if (type == NULL) {
fprintf(stderr, "type detection failed: %s\n", filename);
return -1;
}
if (startswith(type->type, "text/")) {
result = 1;
}
free(path);
mime_free(type);
return result;
}
/**
* Determine if a file is a binary data file
* @param filename
* @return yes=1, no=0
*/
int file_is_binary(const char *filename) {
int result = 0;
char *path = normpath(filename);
Mime *type = file_mimetype(path);
if (type == NULL) {
fprintf(stderr, "type detection failed: %s\n", filename);
return -1;
}
if (startswith(type->type, "application/") && strcmp(type->charset, "binary") == 0) {
result = 1;
}
free(path);
mime_free(type);
return result;
}
int file_is_binexec(const char *filename) {
int result = 0;
char *path = normpath(filename);
Mime *type = file_mimetype(path);
if (type == NULL) {
fprintf(stderr, "type detection failed: %s\n", filename);
return -1;
}
// file-5.38: changed mime name associated with executables
// TODO: implement compatibility function to return the correct search pattern
if (fnmatch("application/x-[pic|pie|ex|sh]*", type->type, FNM_PATHNAME) != FNM_NOMATCH && strcmp(type->charset, "binary") == 0) {
result = 1;
}
free(path);
mime_free(type);
return result;
}
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