Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/dec/bit_reader.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /* Copyright 2013 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 /* Bit reading helpers */
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9 #include "bit_reader.h"
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11 #include <brotli/types.h>
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13 #include "../common/platform.h"
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15 #if defined(__cplusplus) || defined(c_plusplus)
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16 extern "C" {
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17 #endif
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19 const brotli_reg_t kBrotliBitMask[33] = { 0x00000000,
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20 0x00000001, 0x00000003, 0x00000007, 0x0000000F,
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21 0x0000001F, 0x0000003F, 0x0000007F, 0x000000FF,
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22 0x000001FF, 0x000003FF, 0x000007FF, 0x00000FFF,
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23 0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF,
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24 0x0001FFFF, 0x0003FFFF, 0x0007FFFF, 0x000FFFFF,
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25 0x001FFFFF, 0x003FFFFF, 0x007FFFFF, 0x00FFFFFF,
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26 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF,
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27 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF
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28 };
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30 void BrotliInitBitReader(BrotliBitReader* const br) {
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31 br->val_ = 0;
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32 br->bit_pos_ = 0;
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33 }
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35 BROTLI_BOOL BrotliWarmupBitReader(BrotliBitReader* const br) {
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36 size_t aligned_read_mask = (sizeof(br->val_) >> 1) - 1;
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37 /* Fixing alignment after unaligned BrotliFillWindow would result accumulator
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38 overflow. If unalignment is caused by BrotliSafeReadBits, then there is
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39 enough space in accumulator to fix alignment. */
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40 if (BROTLI_UNALIGNED_READ_FAST) {
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41 aligned_read_mask = 0;
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42 }
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43 if (BrotliGetAvailableBits(br) == 0) {
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44 br->val_ = 0;
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45 if (!BrotliPullByte(br)) {
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46 return BROTLI_FALSE;
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47 }
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48 }
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50 while ((((size_t)br->next_in) & aligned_read_mask) != 0) {
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51 if (!BrotliPullByte(br)) {
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52 /* If we consumed all the input, we don't care about the alignment. */
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53 return BROTLI_TRUE;
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54 }
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55 }
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56 return BROTLI_TRUE;
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57 }
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59 BROTLI_BOOL BrotliSafeReadBits32Slow(BrotliBitReader* const br,
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60 brotli_reg_t n_bits, brotli_reg_t* val) {
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61 brotli_reg_t low_val;
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62 brotli_reg_t high_val;
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63 BrotliBitReaderState memento;
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64 BROTLI_DCHECK(n_bits <= 32);
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65 BROTLI_DCHECK(n_bits > 24);
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66 BrotliBitReaderSaveState(br, &memento);
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67 if (!BrotliSafeReadBits(br, 16, &low_val) ||
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68 !BrotliSafeReadBits(br, n_bits - 16, &high_val)) {
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69 BrotliBitReaderRestoreState(br, &memento);
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70 return BROTLI_FALSE;
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71 }
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72 *val = low_val | (high_val << 16);
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73 return BROTLI_TRUE;
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74 }
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75
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76 #if defined(__cplusplus) || defined(c_plusplus)
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77 } /* extern "C" */
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78 #endif