From 15deac4e8c10b4d4dec4186b07f02729b8bfb05f Mon Sep 17 00:00:00 2001
From: davide <davide@davide-Aspire-5920>
Date: Sat, 28 Jul 2018 22:54:26 +0200
Subject: [PATCH 1/3] Added SPIFFS_truncate function

---
 src/spiffs.h          |  8 ++++++++
 src/spiffs_hydrogen.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/src/spiffs.h b/src/spiffs.h
index 534c3df..4c9e101 100644
--- a/src/spiffs.h
+++ b/src/spiffs.h
@@ -496,6 +496,14 @@ s32_t SPIFFS_remove(spiffs *fs, const char *path);
  */
 s32_t SPIFFS_fremove(spiffs *fs, spiffs_file fh);
 
+/**
+ * Removes a file by path
+ * @param fs            the file system struct
+ * @param path          the path of the file to remove
+ * @param length		the new length of truncated file
+ */
+s32_t SPIFFS_truncate(spiffs *fs, const char *path, off_t length);
+
 /**
  * Gets file status by path
  * @param fs            the file system struct
diff --git a/src/spiffs_hydrogen.c b/src/spiffs_hydrogen.c
index 235aaaa..54ad2e5 100644
--- a/src/spiffs_hydrogen.c
+++ b/src/spiffs_hydrogen.c
@@ -724,6 +724,49 @@ s32_t SPIFFS_fremove(spiffs *fs, spiffs_file fh) {
 #endif // SPIFFS_READ_ONLY
 }
 
+s32_t SPIFFS_truncate(spiffs *fs, const char *path, off_t length) {
+  SPIFFS_API_DBG("%s '%s'\n", __func__, path);
+#if SPIFFS_READ_ONLY
+  (void)fs; (void)path;
+  return SPIFFS_ERR_RO_NOT_IMPL;
+#else
+  SPIFFS_API_CHECK_CFG(fs);
+  SPIFFS_API_CHECK_MOUNT(fs);
+  if (strlen(path) > SPIFFS_OBJ_NAME_LEN - 1) {
+    SPIFFS_API_CHECK_RES(fs, SPIFFS_ERR_NAME_TOO_LONG);
+  }
+  SPIFFS_LOCK(fs);
+
+  spiffs_fd *fd;
+  spiffs_page_ix pix;
+  s32_t res;
+
+  res = spiffs_fd_find_new(fs, &fd, 0);
+  SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
+
+  res = spiffs_object_find_object_index_header_by_name(fs, (const u8_t*)path, &pix);
+  if (res != SPIFFS_OK) {
+    spiffs_fd_return(fs, fd->file_nbr);
+  }
+  SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
+
+  res = spiffs_object_open_by_page(fs, pix, fd, 0,0);
+  if (res != SPIFFS_OK) {
+    spiffs_fd_return(fs, fd->file_nbr);
+  }
+  SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
+
+  res = spiffs_object_truncate(fd, length, 0);
+  if (res != SPIFFS_OK) {
+    spiffs_fd_return(fs, fd->file_nbr);
+  }
+  SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
+
+  SPIFFS_UNLOCK(fs);
+  return 0;
+#endif // SPIFFS_READ_ONLY
+}
+
 static s32_t spiffs_stat_pix(spiffs *fs, spiffs_page_ix pix, spiffs_file fh, spiffs_stat *s) {
   (void)fh;
   spiffs_page_object_ix_header objix_hdr;

From 28c366272cf4be9674eb4de02e7816a4b72de0af Mon Sep 17 00:00:00 2001
From: davctv <davide.tasca@contrive.it>
Date: Mon, 30 Jul 2018 11:04:24 +0200
Subject: [PATCH 2/3] Modified type for length to u32_t

---
 src/spiffs.h          | 2 +-
 src/spiffs_hydrogen.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/spiffs.h b/src/spiffs.h
index 4c9e101..991e903 100644
--- a/src/spiffs.h
+++ b/src/spiffs.h
@@ -502,7 +502,7 @@ s32_t SPIFFS_fremove(spiffs *fs, spiffs_file fh);
  * @param path          the path of the file to remove
  * @param length		the new length of truncated file
  */
-s32_t SPIFFS_truncate(spiffs *fs, const char *path, off_t length);
+s32_t SPIFFS_truncate(spiffs *fs, const char *path, u32_t length);
 
 /**
  * Gets file status by path
diff --git a/src/spiffs_hydrogen.c b/src/spiffs_hydrogen.c
index 54ad2e5..40e1f7f 100644
--- a/src/spiffs_hydrogen.c
+++ b/src/spiffs_hydrogen.c
@@ -724,7 +724,7 @@ s32_t SPIFFS_fremove(spiffs *fs, spiffs_file fh) {
 #endif // SPIFFS_READ_ONLY
 }
 
-s32_t SPIFFS_truncate(spiffs *fs, const char *path, off_t length) {
+s32_t SPIFFS_truncate(spiffs *fs, const char *path, u32_t length) {
   SPIFFS_API_DBG("%s '%s'\n", __func__, path);
 #if SPIFFS_READ_ONLY
   (void)fs; (void)path;

From 9006bcc405dcf0ef09f4bde81fb0ec1059b54eeb Mon Sep 17 00:00:00 2001
From: davctv <davide.tasca@contrive.it>
Date: Mon, 30 Jul 2018 11:54:55 +0200
Subject: [PATCH 3/3] Added length also for SPIFFS_READ_ONLY defined section

---
 src/spiffs_hydrogen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/spiffs_hydrogen.c b/src/spiffs_hydrogen.c
index 40e1f7f..f879e32 100644
--- a/src/spiffs_hydrogen.c
+++ b/src/spiffs_hydrogen.c
@@ -727,7 +727,7 @@ s32_t SPIFFS_fremove(spiffs *fs, spiffs_file fh) {
 s32_t SPIFFS_truncate(spiffs *fs, const char *path, u32_t length) {
   SPIFFS_API_DBG("%s '%s'\n", __func__, path);
 #if SPIFFS_READ_ONLY
-  (void)fs; (void)path;
+  (void)fs; (void)path; (void)length;
   return SPIFFS_ERR_RO_NOT_IMPL;
 #else
   SPIFFS_API_CHECK_CFG(fs);