kc3-lang/brotli/c/common/transform.h

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• Hash : 7f740f13
  Author :
  Date : 2020-05-15T11:06:21
  

  Update (#807)
  
   - fix formatting
   - fix type conversion
   - fix no-op arithmetic with null-pointer
   - improve performance of hash_longest_match64
   - go: detect read after close
   - java decoder: support compound dictionary
   - remove executable flag on non-scripts

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• c/common/transform.h

• /* transforms is a part of ABI, but not API.
  
     It means that there are some functions that are supposed to be in "common"
     library, but header itself is not placed into include/brotli. This way,
     aforementioned functions will be available only to brotli internals.
   */
  
  #ifndef BROTLI_COMMON_TRANSFORM_H_
  #define BROTLI_COMMON_TRANSFORM_H_
  
  #include <brotli/port.h>
  #include <brotli/types.h>
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  enum BrotliWordTransformType {
    BROTLI_TRANSFORM_IDENTITY = 0,
    BROTLI_TRANSFORM_OMIT_LAST_1 = 1,
    BROTLI_TRANSFORM_OMIT_LAST_2 = 2,
    BROTLI_TRANSFORM_OMIT_LAST_3 = 3,
    BROTLI_TRANSFORM_OMIT_LAST_4 = 4,
    BROTLI_TRANSFORM_OMIT_LAST_5 = 5,
    BROTLI_TRANSFORM_OMIT_LAST_6 = 6,
    BROTLI_TRANSFORM_OMIT_LAST_7 = 7,
    BROTLI_TRANSFORM_OMIT_LAST_8 = 8,
    BROTLI_TRANSFORM_OMIT_LAST_9 = 9,
    BROTLI_TRANSFORM_UPPERCASE_FIRST = 10,
    BROTLI_TRANSFORM_UPPERCASE_ALL = 11,
    BROTLI_TRANSFORM_OMIT_FIRST_1 = 12,
    BROTLI_TRANSFORM_OMIT_FIRST_2 = 13,
    BROTLI_TRANSFORM_OMIT_FIRST_3 = 14,
    BROTLI_TRANSFORM_OMIT_FIRST_4 = 15,
    BROTLI_TRANSFORM_OMIT_FIRST_5 = 16,
    BROTLI_TRANSFORM_OMIT_FIRST_6 = 17,
    BROTLI_TRANSFORM_OMIT_FIRST_7 = 18,
    BROTLI_TRANSFORM_OMIT_FIRST_8 = 19,
    BROTLI_TRANSFORM_OMIT_FIRST_9 = 20,
    BROTLI_TRANSFORM_SHIFT_FIRST = 21,
    BROTLI_TRANSFORM_SHIFT_ALL = 22,
    BROTLI_NUM_TRANSFORM_TYPES  /* Counts transforms, not a transform itself. */
  };
  
  #define BROTLI_TRANSFORMS_MAX_CUT_OFF BROTLI_TRANSFORM_OMIT_LAST_9
  
  typedef struct BrotliTransforms {
    uint16_t prefix_suffix_size;
    /* Last character must be null, so prefix_suffix_size must be at least 1. */
    const uint8_t* prefix_suffix;
    const uint16_t* prefix_suffix_map;
    uint32_t num_transforms;
    /* Each entry is a [prefix_id, transform, suffix_id] triplet. */
    const uint8_t* transforms;
    /* Shift for BROTLI_TRANSFORM_SHIFT_FIRST and BROTLI_TRANSFORM_SHIFT_ALL,
       must be NULL if and only if no such transforms are present. */
    const uint8_t* params;
    /* Indices of transforms like ["", BROTLI_TRANSFORM_OMIT_LAST_#, ""].
       0-th element corresponds to ["", BROTLI_TRANSFORM_IDENTITY, ""].
       -1, if cut-off transform does not exist. */
    int16_t cutOffTransforms[BROTLI_TRANSFORMS_MAX_CUT_OFF + 1];
  } BrotliTransforms;
  
  /* T is BrotliTransforms*; result is uint8_t. */
  #define BROTLI_TRANSFORM_PREFIX_ID(T, I) ((T)->transforms[((I) * 3) + 0])
  #define BROTLI_TRANSFORM_TYPE(T, I)      ((T)->transforms[((I) * 3) + 1])
  #define BROTLI_TRANSFORM_SUFFIX_ID(T, I) ((T)->transforms[((I) * 3) + 2])
  
  /* T is BrotliTransforms*; result is const uint8_t*. */
  #define BROTLI_TRANSFORM_PREFIX(T, I) (&(T)->prefix_suffix[ \
      (T)->prefix_suffix_map[BROTLI_TRANSFORM_PREFIX_ID(T, I)]])
  #define BROTLI_TRANSFORM_SUFFIX(T, I) (&(T)->prefix_suffix[ \
      (T)->prefix_suffix_map[BROTLI_TRANSFORM_SUFFIX_ID(T, I)]])
  
  BROTLI_COMMON_API const BrotliTransforms* BrotliGetTransforms(void);
  
  BROTLI_COMMON_API int BrotliTransformDictionaryWord(
      uint8_t* dst, const uint8_t* word, int len,
      const BrotliTransforms* transforms, int transform_idx);
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }  /* extern "C" */
  #endif
  
  #endif  /* BROTLI_COMMON_TRANSFORM_H_ */
  

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