Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/write_bits.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /* Copyright 2010 Google Inc. All Rights Reserved.
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3 Distributed under MIT license.
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4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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5 */
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7 /* Write bits into a byte array. */
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9 #ifndef BROTLI_ENC_WRITE_BITS_H_
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10 #define BROTLI_ENC_WRITE_BITS_H_
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12 #include <brotli/types.h>
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14 #include "../common/platform.h"
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16 #if defined(__cplusplus) || defined(c_plusplus)
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17 extern "C" {
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18 #endif
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20 /* This function writes bits into bytes in increasing addresses, and within
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21 a byte least-significant-bit first.
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23 The function can write up to 56 bits in one go with WriteBits
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24 Example: let's assume that 3 bits (Rs below) have been written already:
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26 BYTE-0 BYTE+1 BYTE+2
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28 0000 0RRR 0000 0000 0000 0000
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30 Now, we could write 5 or less bits in MSB by just shifting by 3
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31 and OR'ing to BYTE-0.
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33 For n bits, we take the last 5 bits, OR that with high bits in BYTE-0,
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34 and locate the rest in BYTE+1, BYTE+2, etc. */
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35 static BROTLI_INLINE void BrotliWriteBits(size_t n_bits,
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36 uint64_t bits,
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37 size_t* BROTLI_RESTRICT pos,
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38 uint8_t* BROTLI_RESTRICT array) {
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39 BROTLI_LOG(("WriteBits %2d 0x%08x%08x %10d\n", (int)n_bits,
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40 (uint32_t)(bits >> 32), (uint32_t)(bits & 0xFFFFFFFF),
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41 (int)*pos));
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42 BROTLI_DCHECK((bits >> n_bits) == 0);
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43 BROTLI_DCHECK(n_bits <= 56);
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44 #if defined(BROTLI_LITTLE_ENDIAN)
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45 /* This branch of the code can write up to 56 bits at a time,
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46 7 bits are lost by being perhaps already in *p and at least
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47 1 bit is needed to initialize the bit-stream ahead (i.e. if 7
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48 bits are in *p and we write 57 bits, then the next write will
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49 access a byte that was never initialized). */
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50 {
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51 uint8_t* p = &array[*pos >> 3];
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52 uint64_t v = (uint64_t)(*p); /* Zero-extend 8 to 64 bits. */
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53 v |= bits << (*pos & 7);
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54 BROTLI_UNALIGNED_STORE64LE(p, v); /* Set some bits. */
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55 *pos += n_bits;
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56 }
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57 #else
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58 /* implicit & 0xFF is assumed for uint8_t arithmetics */
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59 {
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60 uint8_t* array_pos = &array[*pos >> 3];
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61 const size_t bits_reserved_in_first_byte = (*pos & 7);
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62 size_t bits_left_to_write;
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63 bits <<= bits_reserved_in_first_byte;
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64 *array_pos++ |= (uint8_t)bits;
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65 for (bits_left_to_write = n_bits + bits_reserved_in_first_byte;
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66 bits_left_to_write >= 9;
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67 bits_left_to_write -= 8) {
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68 bits >>= 8;
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69 *array_pos++ = (uint8_t)bits;
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70 }
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71 *array_pos = 0;
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72 *pos += n_bits;
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73 }
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74 #endif
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75 }
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76
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77 static BROTLI_INLINE void BrotliWriteBitsPrepareStorage(
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78 size_t pos, uint8_t* array) {
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79 BROTLI_LOG(("WriteBitsPrepareStorage %10d\n", (int)pos));
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80 BROTLI_DCHECK((pos & 7) == 0);
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81 array[pos >> 3] = 0;
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82 }
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83
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84 #if defined(__cplusplus) || defined(c_plusplus)
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85 } /* extern "C" */
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86 #endif
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87
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88 #endif /* BROTLI_ENC_WRITE_BITS_H_ */