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- #include "fs.h"
- #include "printf.h"
- #include "str.h"
- struct packed_file {
- const char *data;
- size_t size;
- size_t pos;
- };
- #if MG_ENABLE_PACKED_FS
- #else
- const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {
- *size = 0, *mtime = 0;
- (void) path;
- return NULL;
- }
- const char *mg_unlist(size_t no) {
- (void) no;
- return NULL;
- }
- #endif
- struct mg_str mg_unpacked(const char *path) {
- size_t len = 0;
- const char *buf = mg_unpack(path, &len, NULL);
- return mg_str_n(buf, len);
- }
- static int is_dir_prefix(const char *prefix, size_t n, const char *path) {
- // MG_INFO(("[%.*s] [%s] %c", (int) n, prefix, path, path[n]));
- return n < strlen(path) && strncmp(prefix, path, n) == 0 &&
- (n == 0 || path[n] == '/' || path[n - 1] == '/');
- }
- static int packed_stat(const char *path, size_t *size, time_t *mtime) {
- const char *p;
- size_t i, n = strlen(path);
- if (mg_unpack(path, size, mtime)) return MG_FS_READ; // Regular file
- // Scan all files. If `path` is a dir prefix for any of them, it's a dir
- for (i = 0; (p = mg_unlist(i)) != NULL; i++) {
- if (is_dir_prefix(path, n, p)) return MG_FS_DIR;
- }
- return 0;
- }
- static void packed_list(const char *dir, void (*fn)(const char *, void *),
- void *userdata) {
- char buf[MG_PATH_MAX], tmp[sizeof(buf)];
- const char *path, *begin, *end;
- size_t i, n = strlen(dir);
- tmp[0] = '\0'; // Previously listed entry
- for (i = 0; (path = mg_unlist(i)) != NULL; i++) {
- if (!is_dir_prefix(dir, n, path)) continue;
- begin = &path[n + 1];
- end = strchr(begin, '/');
- if (end == NULL) end = begin + strlen(begin);
- mg_snprintf(buf, sizeof(buf), "%.*s", (int) (end - begin), begin);
- buf[sizeof(buf) - 1] = '\0';
- // If this entry has been already listed, skip
- // NOTE: we're assuming that file list is sorted alphabetically
- if (strcmp(buf, tmp) == 0) continue;
- fn(buf, userdata); // Not yet listed, call user function
- strcpy(tmp, buf); // And save this entry as listed
- }
- }
- static void *packed_open(const char *path, int flags) {
- size_t size = 0;
- const char *data = mg_unpack(path, &size, NULL);
- struct packed_file *fp = NULL;
- if (data == NULL) return NULL;
- if (flags & MG_FS_WRITE) return NULL;
- if ((fp = (struct packed_file *) calloc(1, sizeof(*fp))) != NULL) {
- fp->size = size;
- fp->data = data;
- }
- return (void *) fp;
- }
- static void packed_close(void *fp) {
- if (fp != NULL) free(fp);
- }
- static size_t packed_read(void *fd, void *buf, size_t len) {
- struct packed_file *fp = (struct packed_file *) fd;
- if (fp->pos + len > fp->size) len = fp->size - fp->pos;
- memcpy(buf, &fp->data[fp->pos], len);
- fp->pos += len;
- return len;
- }
- static size_t packed_write(void *fd, const void *buf, size_t len) {
- (void) fd, (void) buf, (void) len;
- return 0;
- }
- static size_t packed_seek(void *fd, size_t offset) {
- struct packed_file *fp = (struct packed_file *) fd;
- fp->pos = offset;
- if (fp->pos > fp->size) fp->pos = fp->size;
- return fp->pos;
- }
- static bool packed_rename(const char *from, const char *to) {
- (void) from, (void) to;
- return false;
- }
- static bool packed_remove(const char *path) {
- (void) path;
- return false;
- }
- static bool packed_mkdir(const char *path) {
- (void) path;
- return false;
- }
- struct mg_fs mg_fs_packed = {
- packed_stat, packed_list, packed_open, packed_close, packed_read,
- packed_write, packed_seek, packed_rename, packed_remove, packed_mkdir};
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