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Moonchild
bfc67972ed
This includes a minor patch to encode.c to work around the "static init" check that actually doesn't do anything in its default state, but, due to compiler subtleties in handling duplicate object names, would not be able to link brotli.exe because it would refuse to expose all symbols for duplicate objects (a later one would just be ignored). Unsure how clang does this but it's not portable across compilers. (we need the brotli.exe tool for resource package compression)
85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/* transforms is a part of ABI, but not API.
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It means that there are some functions that are supposed to be in "common"
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library, but header itself is not placed into include/brotli. This way,
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aforementioned functions will be available only to brotli internals.
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*/
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#ifndef BROTLI_COMMON_TRANSFORM_H_
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#define BROTLI_COMMON_TRANSFORM_H_
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#include "platform.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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enum BrotliWordTransformType {
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BROTLI_TRANSFORM_IDENTITY = 0,
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BROTLI_TRANSFORM_OMIT_LAST_1 = 1,
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BROTLI_TRANSFORM_OMIT_LAST_2 = 2,
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BROTLI_TRANSFORM_OMIT_LAST_3 = 3,
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BROTLI_TRANSFORM_OMIT_LAST_4 = 4,
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BROTLI_TRANSFORM_OMIT_LAST_5 = 5,
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BROTLI_TRANSFORM_OMIT_LAST_6 = 6,
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BROTLI_TRANSFORM_OMIT_LAST_7 = 7,
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BROTLI_TRANSFORM_OMIT_LAST_8 = 8,
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BROTLI_TRANSFORM_OMIT_LAST_9 = 9,
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BROTLI_TRANSFORM_UPPERCASE_FIRST = 10,
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BROTLI_TRANSFORM_UPPERCASE_ALL = 11,
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BROTLI_TRANSFORM_OMIT_FIRST_1 = 12,
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BROTLI_TRANSFORM_OMIT_FIRST_2 = 13,
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BROTLI_TRANSFORM_OMIT_FIRST_3 = 14,
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BROTLI_TRANSFORM_OMIT_FIRST_4 = 15,
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BROTLI_TRANSFORM_OMIT_FIRST_5 = 16,
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BROTLI_TRANSFORM_OMIT_FIRST_6 = 17,
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BROTLI_TRANSFORM_OMIT_FIRST_7 = 18,
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BROTLI_TRANSFORM_OMIT_FIRST_8 = 19,
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BROTLI_TRANSFORM_OMIT_FIRST_9 = 20,
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BROTLI_TRANSFORM_SHIFT_FIRST = 21,
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BROTLI_TRANSFORM_SHIFT_ALL = 22,
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BROTLI_NUM_TRANSFORM_TYPES /* Counts transforms, not a transform itself. */
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};
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#define BROTLI_TRANSFORMS_MAX_CUT_OFF BROTLI_TRANSFORM_OMIT_LAST_9
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typedef struct BrotliTransforms {
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uint16_t prefix_suffix_size;
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/* Last character must be null, so prefix_suffix_size must be at least 1. */
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const uint8_t* prefix_suffix;
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const uint16_t* prefix_suffix_map;
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uint32_t num_transforms;
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/* Each entry is a [prefix_id, transform, suffix_id] triplet. */
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const uint8_t* transforms;
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/* Shift for BROTLI_TRANSFORM_SHIFT_FIRST and BROTLI_TRANSFORM_SHIFT_ALL,
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must be NULL if and only if no such transforms are present. */
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const uint8_t* params;
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/* Indices of transforms like ["", BROTLI_TRANSFORM_OMIT_LAST_#, ""].
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0-th element corresponds to ["", BROTLI_TRANSFORM_IDENTITY, ""].
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-1, if cut-off transform does not exist. */
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int16_t cutOffTransforms[BROTLI_TRANSFORMS_MAX_CUT_OFF + 1];
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} BrotliTransforms;
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/* T is BrotliTransforms*; result is uint8_t. */
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#define BROTLI_TRANSFORM_PREFIX_ID(T, I) ((T)->transforms[((I) * 3) + 0])
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#define BROTLI_TRANSFORM_TYPE(T, I) ((T)->transforms[((I) * 3) + 1])
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#define BROTLI_TRANSFORM_SUFFIX_ID(T, I) ((T)->transforms[((I) * 3) + 2])
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/* T is BrotliTransforms*; result is const uint8_t*. */
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#define BROTLI_TRANSFORM_PREFIX(T, I) (&(T)->prefix_suffix[ \
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(T)->prefix_suffix_map[BROTLI_TRANSFORM_PREFIX_ID(T, I)]])
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#define BROTLI_TRANSFORM_SUFFIX(T, I) (&(T)->prefix_suffix[ \
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(T)->prefix_suffix_map[BROTLI_TRANSFORM_SUFFIX_ID(T, I)]])
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BROTLI_COMMON_API const BrotliTransforms* BrotliGetTransforms(void);
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BROTLI_COMMON_API int BrotliTransformDictionaryWord(
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uint8_t* dst, const uint8_t* word, int len,
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const BrotliTransforms* transforms, int transform_idx);
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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#endif /* BROTLI_COMMON_TRANSFORM_H_ */
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