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fs_utils.h

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+/*
+ * Misc FS utilities
+ * 
+ * Copyright (c) 2016-2017 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#define HEAD_FILENAME "head"
+#define ROOT_FILENAME "files"
+
+#define FILEID_SIZE_MAX 32
+
+#define FS_KEY_LEN 16
+
+/* default block size to determine the total filesytem size */
+#define FS_BLOCK_SIZE_LOG2 12
+#define FS_BLOCK_SIZE (1 << FS_BLOCK_SIZE_LOG2)
+
+typedef enum {
+    FS_ERR_OK = 0,
+    FS_ERR_GENERIC = -1,
+    FS_ERR_SYNTAX = -2,
+    FS_ERR_REVISION = -3,
+    FS_ERR_FILE_ID = -4,
+    FS_ERR_IO = -5,
+    FS_ERR_NOENT = -6,
+    FS_ERR_COUNTERS = -7,
+    FS_ERR_QUOTA = -8,
+    FS_ERR_PROTOCOL_VERSION = -9,
+    FS_ERR_HEAD = -10,
+} FSCommitErrorCode;
+
+typedef uint64_t FSFileID;
+
+static inline BOOL isspace_nolf(int c)
+{
+    return (c == ' ' || c == '\t');
+}
+
+static inline int from_hex(int c)
+{
+    if (c >= '0' && c <= '9')
+        return c - '0';
+    else if (c >= 'A' && c <= 'F')
+        return c - 'A' + 10;
+    else if (c >= 'a' && c <= 'f')
+        return c - 'a' + 10;
+    else
+        return -1;
+}
+
+static inline uint64_t block_align(uint64_t val, uint64_t align)
+{
+    return (val + align - 1) & ~(align - 1);
+}
+
+void pstrcpy(char *buf, int buf_size, const char *str);
+char *pstrcat(char *buf, int buf_size, const char *s);
+char *compose_path(const char *path, const char *name);
+char *compose_url(const char *base_url, const char *name);
+void skip_line(const char **pp);
+char *quoted_str(const char *str);
+int parse_fname(char *buf, int buf_size, const char **pp);
+int parse_uint32_base(uint32_t *pval, const char **pp, int base);
+int parse_uint64_base(uint64_t *pval, const char **pp, int base);
+int parse_uint64(uint64_t *pval, const char **pp);
+int parse_uint32(uint32_t *pval, const char **pp);
+int parse_time(uint32_t *psec, uint32_t *pnsec, const char **pp);
+int parse_file_id(FSFileID *pval, const char **pp);
+char *file_id_to_filename(char *buf, FSFileID file_id);
+void encode_hex(char *str, const uint8_t *buf, int len);
+int decode_hex(uint8_t *buf, const char *str, int len);
+BOOL is_url(const char *path);
+
+const char *skip_header(const char *p);
+int parse_tag(char *buf, int buf_size, const char *str, const char *tag);
+int parse_tag_uint64(uint64_t *pval, const char *str, const char *tag);
+int parse_tag_file_id(FSFileID *pval, const char *str, const char *tag);
+int parse_tag_version(const char *str);