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author | Jay Berkenbilt <ejb@ql.org> | 2022-03-07 23:55:11 +0100 |
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committer | Jay Berkenbilt <ejb@ql.org> | 2022-03-08 00:01:27 +0100 |
commit | f0307891048688780525c1f43a4a04ccf788ffb3 (patch) | |
tree | 9b687cfb36bafd18e20ac468b27ea795aab93c79 /libqpdf/bits_include.cc | |
parent | 17c0e38c8efa7882f8e6a13c6030edf3e768257c (diff) | |
download | qpdf-f0307891048688780525c1f43a4a04ccf788ffb3.tar.zst |
Rename bits_include.cc to qpdf/bits_functions.hh
It's better to just make it a .hh file to reduce confusion.
Diffstat (limited to 'libqpdf/bits_include.cc')
-rw-r--r-- | libqpdf/bits_include.cc | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/libqpdf/bits_include.cc b/libqpdf/bits_include.cc deleted file mode 100644 index 0f52b4e7..00000000 --- a/libqpdf/bits_include.cc +++ /dev/null @@ -1,155 +0,0 @@ -// This file is #included in other source files. - -#ifndef __BITS_CC__ -#define __BITS_CC__ - -#include <algorithm> -#include <stdexcept> -#include <qpdf/QTC.hh> -#include <qpdf/Pipeline.hh> -#include <qpdf/QUtil.hh> - -// These functions may be run at places where the function call -// overhead from test coverage testing would be too high. Therefore, -// we make the test coverage cases conditional upon a preprocessor -// symbol. BitStream.cc includes this file without defining the -// symbol, and the specially designed test code that fully exercises -// this code includes with the symbol defined. - -#ifdef BITS_READ -static unsigned long long -read_bits(unsigned char const*& p, size_t& bit_offset, - size_t& bits_available, size_t bits_wanted) -{ - // View p as a stream of bits: - - // 76543210 76543210 .... - - // bit_offset is the bit number within the first byte that marks - // the first bit that we would read. - - if (bits_wanted > bits_available) - { - throw std::runtime_error( - "overflow reading bit stream: wanted = " + - QUtil::uint_to_string(bits_wanted) + "; available = " + - QUtil::uint_to_string(bits_available)); - } - if (bits_wanted > 32) - { - throw std::out_of_range("read_bits: too many bits requested"); - } - - unsigned long result = 0; -#ifdef BITS_TESTING - if (bits_wanted == 0) - { - QTC::TC("libtests", "bits zero bits wanted"); - } -#endif - while (bits_wanted > 0) - { - // Grab bits from the first byte clearing anything before - // bit_offset. - unsigned char byte = static_cast<unsigned char>( - *p & ((1U << (bit_offset + 1U)) - 1U)); - - // There are bit_offset + 1 bits available in the first byte. - size_t to_copy = std::min(bits_wanted, bit_offset + 1); - size_t leftover = (bit_offset + 1) - to_copy; - -#ifdef BITS_TESTING - QTC::TC("libtests", "bits bit_offset", - ((bit_offset == 0) ? 0 : - (bit_offset == 7) ? 1 : - 2)); - QTC::TC("libtests", "bits leftover", (leftover > 0) ? 1 : 0); -#endif - - // Right shift so that all the bits we want are right justified. - byte = static_cast<unsigned char>(byte >> leftover); - - // Copy the bits into result - result <<= to_copy; - result |= byte; - - // Update pointers - if (leftover) - { - bit_offset = leftover - 1; - } - else - { - bit_offset = 7; - ++p; - } - bits_wanted -= to_copy; - bits_available -= to_copy; - -#ifdef BITS_TESTING - QTC::TC("libtests", "bits iterations", - ((bits_wanted > 8) ? 0 : - (bits_wanted > 0) ? 1 : - 2)); -#endif - } - - return result; -} -#endif - -#ifdef BITS_WRITE -static void -write_bits(unsigned char& ch, size_t& bit_offset, - unsigned long long val, size_t bits, Pipeline* pipeline) -{ - if (bits > 32) - { - throw std::out_of_range("write_bits: too many bits requested"); - } - - // bit_offset + 1 is the number of bits left in ch -#ifdef BITS_TESTING - if (bits == 0) - { - QTC::TC("libtests", "bits write zero bits"); - } -#endif - while (bits > 0) - { - size_t bits_to_write = std::min(bits, bit_offset + 1); - unsigned char newval = static_cast<unsigned char>( - (val >> (bits - bits_to_write)) & ((1U << bits_to_write) - 1)); - size_t bits_left_in_ch = bit_offset + 1 - bits_to_write; - newval = static_cast<unsigned char>(newval << bits_left_in_ch); - ch |= newval; - if (bits_left_in_ch == 0) - { -#ifdef BITS_TESTING - QTC::TC("libtests", "bits write pipeline"); -#endif - pipeline->write(&ch, 1); - bit_offset = 7; - ch = 0; - } - else - { -#ifdef BITS_TESTING - QTC::TC("libtests", "bits write leftover"); -#endif - bit_offset -= bits_to_write; - } - bits -= bits_to_write; -#ifdef BITS_TESTING - QTC::TC("libtests", "bits write iterations", - ((bits > 8) ? 0 : - (bits > 0) ? 1 : - 2)); -#endif - } - -} -#endif - - -#endif // __BITS_CC__ |