convert.h

   1 /*
   2  * Copyright (c) 2011, Google Inc.
   3  */
   4 #ifndef CONVERT_H
   5 #define CONVERT_H
   6
   7 #include "hash.h"
   8 #include "string-list.h"
   9
  10 struct index_state;
  11 struct strbuf;
  12
  13 #define CONV_EOL_RNDTRP_DIE   (1<<0) /* Die if CRLF to LF to CRLF is different */
  14 #define CONV_EOL_RNDTRP_WARN  (1<<1) /* Warn if CRLF to LF to CRLF is different */
  15 #define CONV_EOL_RENORMALIZE  (1<<2) /* Convert CRLF to LF */
  16 #define CONV_EOL_KEEP_CRLF    (1<<3) /* Keep CRLF line endings as is */
  17 #define CONV_WRITE_OBJECT     (1<<4) /* Content is written to the index */
  18
  19 extern int global_conv_flags_eol;
  20
  21 enum auto_crlf {
  22         AUTO_CRLF_FALSE = 0,
  23         AUTO_CRLF_TRUE = 1,
  24         AUTO_CRLF_INPUT = -1
  25 };
  26
  27 extern enum auto_crlf auto_crlf;
  28
  29 enum eol {
  30         EOL_UNSET,
  31         EOL_CRLF,
  32         EOL_LF,
  33 #ifdef NATIVE_CRLF
  34         EOL_NATIVE = EOL_CRLF
  35 #else
  36         EOL_NATIVE = EOL_LF
  37 #endif
  38 };
  39
  40 enum ce_delay_state {
  41         CE_NO_DELAY = 0,
  42         CE_CAN_DELAY = 1,
  43         CE_RETRY = 2
  44 };
  45
  46 struct delayed_checkout {
  47         /*
  48          * State of the currently processed cache entry. If the state is
  49          * CE_CAN_DELAY, then the filter can delay the current cache entry.
  50          * If the state is CE_RETRY, then this signals the filter that the
  51          * cache entry was requested before.
  52          */
  53         enum ce_delay_state state;
  54         /* List of filter drivers that signaled delayed blobs. */
  55         struct string_list filters;
  56         /* List of delayed blobs identified by their path. */
  57         struct string_list paths;
  58 };
  59
  60 struct checkout_metadata {
  61         const char *refname;
  62         struct object_id treeish;
  63         struct object_id blob;
  64 };
  65
  66 enum convert_crlf_action {
  67         CRLF_UNDEFINED,
  68         CRLF_BINARY,
  69         CRLF_TEXT,
  70         CRLF_TEXT_INPUT,
  71         CRLF_TEXT_CRLF,
  72         CRLF_AUTO,
  73         CRLF_AUTO_INPUT,
  74         CRLF_AUTO_CRLF
  75 };
  76
  77 struct convert_driver;
  78
  79 struct conv_attrs {
  80         struct convert_driver *drv;
  81         enum convert_crlf_action attr_action; /* What attr says */
  82         enum convert_crlf_action crlf_action; /* When no attr is set, use core.autocrlf */
  83         int ident;
  84         const char *working_tree_encoding; /* Supported encoding or default encoding if NULL */
  85 };
  86
  87 void convert_attrs(const struct index_state *istate,
  88                    struct conv_attrs *ca, const char *path);
  89
  90 extern enum eol core_eol;
  91 extern char *check_roundtrip_encoding;
  92 const char *get_cached_convert_stats_ascii(const struct index_state *istate,
  93                                            const char *path);
  94 const char *get_wt_convert_stats_ascii(const char *path);
  95 const char *get_convert_attr_ascii(const struct index_state *istate,
  96                                    const char *path);
  97
  98 /* returns 1 if *dst was used */
  99 int convert_to_git(const struct index_state *istate,
 100                    const char *path, const char *src, size_t len,
 101                    struct strbuf *dst, int conv_flags);
 102 int convert_to_working_tree_ca(const struct conv_attrs *ca,
 103                                const char *path, const char *src,
 104                                size_t len, struct strbuf *dst,
 105                                const struct checkout_metadata *meta);
 106 int async_convert_to_working_tree_ca(const struct conv_attrs *ca,
 107                                      const char *path, const char *src,
 108                                      size_t len, struct strbuf *dst,
 109                                      const struct checkout_metadata *meta,
 110                                      void *dco);
 111 static inline int convert_to_working_tree(const struct index_state *istate,
 112                                           const char *path, const char *src,
 113                                           size_t len, struct strbuf *dst,
 114                                           const struct checkout_metadata *meta)
 115 {
 116         struct conv_attrs ca;
 117         convert_attrs(istate, &ca, path);
 118         return convert_to_working_tree_ca(&ca, path, src, len, dst, meta);
 119 }
 120 static inline int async_convert_to_working_tree(const struct index_state *istate,
 121                                                 const char *path, const char *src,
 122                                                 size_t len, struct strbuf *dst,
 123                                                 const struct checkout_metadata *meta,
 124                                                 void *dco)
 125 {
 126         struct conv_attrs ca;
 127         convert_attrs(istate, &ca, path);
 128         return async_convert_to_working_tree_ca(&ca, path, src, len, dst, meta, dco);
 129 }
 130 int async_query_available_blobs(const char *cmd,
 131                                 struct string_list *available_paths);
 132 int renormalize_buffer(const struct index_state *istate,
 133                        const char *path, const char *src, size_t len,
 134                        struct strbuf *dst);
 135 static inline int would_convert_to_git(const struct index_state *istate,
 136                                        const char *path)
 137 {
 138         return convert_to_git(istate, path, NULL, 0, NULL, 0);
 139 }
 140 /* Precondition: would_convert_to_git_filter_fd(path) == true */
 141 void convert_to_git_filter_fd(const struct index_state *istate,
 142                               const char *path, int fd,
 143                               struct strbuf *dst,
 144                               int conv_flags);
 145 int would_convert_to_git_filter_fd(const struct index_state *istate,
 146                                    const char *path);
 147
 148 /*
 149  * Initialize the checkout metadata with the given values.  Any argument may be
 150  * NULL if it is not applicable.  The treeish should be a commit if that is
 151  * available, and a tree otherwise.
 152  *
 153  * The refname is not copied and must be valid for the lifetime of the struct.
 154  * THe object IDs are copied.
 155  */
 156 void init_checkout_metadata(struct checkout_metadata *meta, const char *refname,
 157                             const struct object_id *treeish,
 158                             const struct object_id *blob);
 159
 160 /* Copy the metadata from src to dst, updating the blob. */
 161 void clone_checkout_metadata(struct checkout_metadata *dst,
 162                              const struct checkout_metadata *src,
 163                              const struct object_id *blob);
 164
 165 /*
 166  * Reset the internal list of attributes used by convert_to_git and
 167  * convert_to_working_tree.
 168  */
 169 void reset_parsed_attributes(void);
 170
 171 /*****************************************************************
 172  *
 173  * Streaming conversion support
 174  *
 175  *****************************************************************/
 176
 177 struct stream_filter; /* opaque */
 178
 179 struct stream_filter *get_stream_filter(const struct index_state *istate,
 180                                         const char *path,
 181                                         const struct object_id *);
 182 struct stream_filter *get_stream_filter_ca(const struct conv_attrs *ca,
 183                                            const struct object_id *oid);
 184 void free_stream_filter(struct stream_filter *);
 185 int is_null_stream_filter(struct stream_filter *);
 186
 187 /*
 188  * Use as much input up to *isize_p and fill output up to *osize_p;
 189  * update isize_p and osize_p to indicate how much buffer space was
 190  * consumed and filled. Return 0 on success, non-zero on error.
 191  *
 192  * Some filters may need to buffer the input and look-ahead inside it
 193  * to decide what to output, and they may consume more than zero bytes
 194  * of input and still not produce any output. After feeding all the
 195  * input, pass NULL as input and keep calling this function, to let
 196  * such filters know there is no more input coming and it is time for
 197  * them to produce the remaining output based on the buffered input.
 198  */
 199 int stream_filter(struct stream_filter *,
 200                   const char *input, size_t *isize_p,
 201                   char *output, size_t *osize_p);
 202
 203 enum conv_attrs_classification {
 204         /*
 205          * The blob must be loaded into a buffer before it can be
 206          * smudged. All smudging is done in-proc.
 207          */
 208         CA_CLASS_INCORE,
 209
 210         /*
 211          * The blob must be loaded into a buffer, but uses a
 212          * single-file driver filter, such as rot13.
 213          */
 214         CA_CLASS_INCORE_FILTER,
 215
 216         /*
 217          * The blob must be loaded into a buffer, but uses a
 218          * long-running driver process, such as LFS. This might or
 219          * might not use delayed operations. (The important thing is
 220          * that there is a single subordinate long-running process
 221          * handling all associated blobs and in case of delayed
 222          * operations, may hold per-blob state.)
 223          */
 224         CA_CLASS_INCORE_PROCESS,
 225
 226         /*
 227          * The blob can be streamed and smudged without needing to
 228          * completely read it into a buffer.
 229          */
 230         CA_CLASS_STREAMABLE,
 231 };
 232
 233 enum conv_attrs_classification classify_conv_attrs(
 234         const struct conv_attrs *ca);
 235
 236 #endif /* CONVERT_H */