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-rw-r--r--modules/brotli/common/transform.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/modules/brotli/common/transform.h b/modules/brotli/common/transform.h
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+++ b/modules/brotli/common/transform.h
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+/* 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_ */