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