MdeModulePkg/BrotliCustomDecompressLib: Make brotli a submodule

[mirror_edk2.git] / BaseTools / Source / C / BrotliCompress / enc / command.h

/* Copyright 2013 Google Inc. All Rights Reserved.\r
\r
   Distributed under MIT license.\r
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT\r
*/\r
\r
/* This class models a sequence of literals and a backward reference copy. */\r
\r
#ifndef BROTLI_ENC_COMMAND_H_\r
#define BROTLI_ENC_COMMAND_H_\r
\r
#include "../common/constants.h"\r
#include "../common/platform.h"\r
#include <brotli/types.h>\r
#include "./fast_log.h"\r
#include "./params.h"\r
#include "./prefix.h"\r
\r
#if defined(__cplusplus) || defined(c_plusplus)\r
extern "C" {\r
#endif\r
\r
static uint32_t kInsBase[] =   { 0, 1, 2, 3, 4, 5, 6, 8, 10, 14, 18, 26, 34, 50,\r
    66, 98, 130, 194, 322, 578, 1090, 2114, 6210, 22594 };\r
static uint32_t kInsExtra[] =  { 0, 0, 0, 0, 0, 0, 1, 1,  2,  2,  3,  3,  4,  4,\r
    5,   5,   6,   7,   8,   9,   10,   12,   14,    24 };\r
static uint32_t kCopyBase[] =  { 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 18, 22, 30,\r
    38, 54,  70, 102, 134, 198, 326,   582, 1094,  2118 };\r
static uint32_t kCopyExtra[] = { 0, 0, 0, 0, 0, 0, 0, 0,  1,  1,  2,  2,  3,  3,\r
     4,  4,   5,   5,   6,   7,   8,     9,   10,    24 };\r
\r
static BROTLI_INLINE uint16_t GetInsertLengthCode(size_t insertlen) {\r
  if (insertlen < 6) {\r
    return (uint16_t)insertlen;\r
  } else if (insertlen < 130) {\r
    uint32_t nbits = Log2FloorNonZero(insertlen - 2) - 1u;\r
    return (uint16_t)((nbits << 1) + ((insertlen - 2) >> nbits) + 2);\r
  } else if (insertlen < 2114) {\r
    return (uint16_t)(Log2FloorNonZero(insertlen - 66) + 10);\r
  } else if (insertlen < 6210) {\r
    return 21u;\r
  } else if (insertlen < 22594) {\r
    return 22u;\r
  } else {\r
    return 23u;\r
  }\r
}\r
\r
static BROTLI_INLINE uint16_t GetCopyLengthCode(size_t copylen) {\r
  if (copylen < 10) {\r
    return (uint16_t)(copylen - 2);\r
  } else if (copylen < 134) {\r
    uint32_t nbits = Log2FloorNonZero(copylen - 6) - 1u;\r
    return (uint16_t)((nbits << 1) + ((copylen - 6) >> nbits) + 4);\r
  } else if (copylen < 2118) {\r
    return (uint16_t)(Log2FloorNonZero(copylen - 70) + 12);\r
  } else {\r
    return 23u;\r
  }\r
}\r
\r
static BROTLI_INLINE uint16_t CombineLengthCodes(\r
    uint16_t inscode, uint16_t copycode, BROTLI_BOOL use_last_distance) {\r
  uint16_t bits64 =\r
      (uint16_t)((copycode & 0x7u) | ((inscode & 0x7u) << 3u));\r
  if (use_last_distance && inscode < 8u && copycode < 16u) {\r
    return (copycode < 8u) ? bits64 : (bits64 | 64u);\r
  } else {\r
    /* Specification: 5 Encoding of ... (last table) */\r
    /* offset = 2 * index, where index is in range [0..8] */\r
    uint32_t offset = 2u * ((copycode >> 3u) + 3u * (inscode >> 3u));\r
    /* All values in specification are K * 64,\r
       where   K = [2, 3, 6, 4, 5, 8, 7, 9, 10],\r
           i + 1 = [1, 2, 3, 4, 5, 6, 7, 8,  9],\r
       K - i - 1 = [1, 1, 3, 0, 0, 2, 0, 1,  2] = D.\r
       All values in D require only 2 bits to encode.\r
       Magic constant is shifted 6 bits left, to avoid final multiplication. */\r
    offset = (offset << 5u) + 0x40u + ((0x520D40u >> offset) & 0xC0u);\r
    return (uint16_t)(offset | bits64);\r
  }\r
}\r
\r
static BROTLI_INLINE void GetLengthCode(size_t insertlen, size_t copylen,\r
                                        BROTLI_BOOL use_last_distance,\r
                                        uint16_t* code) {\r
  uint16_t inscode = GetInsertLengthCode(insertlen);\r
  uint16_t copycode = GetCopyLengthCode(copylen);\r
  *code = CombineLengthCodes(inscode, copycode, use_last_distance);\r
}\r
\r
static BROTLI_INLINE uint32_t GetInsertBase(uint16_t inscode) {\r
  return kInsBase[inscode];\r
}\r
\r
static BROTLI_INLINE uint32_t GetInsertExtra(uint16_t inscode) {\r
  return kInsExtra[inscode];\r
}\r
\r
static BROTLI_INLINE uint32_t GetCopyBase(uint16_t copycode) {\r
  return kCopyBase[copycode];\r
}\r
\r
static BROTLI_INLINE uint32_t GetCopyExtra(uint16_t copycode) {\r
  return kCopyExtra[copycode];\r
}\r
\r
typedef struct Command {\r
  uint32_t insert_len_;\r
  /* Stores copy_len in low 25 bits and copy_code - copy_len in high 7 bit. */\r
  uint32_t copy_len_;\r
  /* Stores distance extra bits. */\r
  uint32_t dist_extra_;\r
  uint16_t cmd_prefix_;\r
  /* Stores distance code in low 10 bits\r
     and number of extra bits in high 6 bits. */\r
  uint16_t dist_prefix_;\r
} Command;\r
\r
/* distance_code is e.g. 0 for same-as-last short code, or 16 for offset 1. */\r
static BROTLI_INLINE void InitCommand(Command* self,\r
    const BrotliDistanceParams* dist, size_t insertlen,\r
    size_t copylen, int copylen_code_delta, size_t distance_code) {\r
  /* Don't rely on signed int representation, use honest casts. */\r
  uint32_t delta = (uint8_t)((int8_t)copylen_code_delta);\r
  self->insert_len_ = (uint32_t)insertlen;\r
  self->copy_len_ = (uint32_t)(copylen | (delta << 25));\r
  /* The distance prefix and extra bits are stored in this Command as if\r
     npostfix and ndirect were 0, they are only recomputed later after the\r
     clustering if needed. */\r
  PrefixEncodeCopyDistance(\r
      distance_code, dist->num_direct_distance_codes,\r
      dist->distance_postfix_bits, &self->dist_prefix_, &self->dist_extra_);\r
  GetLengthCode(\r
      insertlen, (size_t)((int)copylen + copylen_code_delta),\r
      TO_BROTLI_BOOL((self->dist_prefix_ & 0x3FF) == 0), &self->cmd_prefix_);\r
}\r
\r
static BROTLI_INLINE void InitInsertCommand(Command* self, size_t insertlen) {\r
  self->insert_len_ = (uint32_t)insertlen;\r
  self->copy_len_ = 4 << 25;\r
  self->dist_extra_ = 0;\r
  self->dist_prefix_ = BROTLI_NUM_DISTANCE_SHORT_CODES;\r
  GetLengthCode(insertlen, 4, BROTLI_FALSE, &self->cmd_prefix_);\r
}\r
\r
static BROTLI_INLINE uint32_t CommandRestoreDistanceCode(\r
    const Command* self, const BrotliDistanceParams* dist) {\r
  if ((self->dist_prefix_ & 0x3FFu) <\r
      BROTLI_NUM_DISTANCE_SHORT_CODES + dist->num_direct_distance_codes) {\r
    return self->dist_prefix_ & 0x3FFu;\r
  } else {\r
    uint32_t dcode = self->dist_prefix_ & 0x3FFu;\r
    uint32_t nbits = self->dist_prefix_ >> 10;\r
    uint32_t extra = self->dist_extra_;\r
    uint32_t postfix_mask = (1U << dist->distance_postfix_bits) - 1U;\r
    uint32_t hcode = (dcode - dist->num_direct_distance_codes -\r
        BROTLI_NUM_DISTANCE_SHORT_CODES) >>\r
        dist->distance_postfix_bits;\r
    uint32_t lcode = (dcode - dist->num_direct_distance_codes -\r
        BROTLI_NUM_DISTANCE_SHORT_CODES) & postfix_mask;\r
    uint32_t offset = ((2U + (hcode & 1U)) << nbits) - 4U;\r
    return ((offset + extra) << dist->distance_postfix_bits) + lcode +\r
        dist->num_direct_distance_codes + BROTLI_NUM_DISTANCE_SHORT_CODES;\r
  }\r
}\r
\r
static BROTLI_INLINE uint32_t CommandDistanceContext(const Command* self) {\r
  uint32_t r = self->cmd_prefix_ >> 6;\r
  uint32_t c = self->cmd_prefix_ & 7;\r
  if ((r == 0 || r == 2 || r == 4 || r == 7) && (c <= 2)) {\r
    return c;\r
  }\r
  return 3;\r
}\r
\r
static BROTLI_INLINE uint32_t CommandCopyLen(const Command* self) {\r
  return self->copy_len_ & 0x1FFFFFF;\r
}\r
\r
static BROTLI_INLINE uint32_t CommandCopyLenCode(const Command* self) {\r
  uint32_t modifier = self->copy_len_ >> 25;\r
  int32_t delta = (int8_t)((uint8_t)(modifier | ((modifier & 0x40) << 1)));\r
  return (uint32_t)((int32_t)(self->copy_len_ & 0x1FFFFFF) + delta);\r
}\r
\r
#if defined(__cplusplus) || defined(c_plusplus)\r
}  /* extern "C" */\r
#endif\r
\r
#endif  /* BROTLI_ENC_COMMAND_H_ */\r