diff options
Diffstat (limited to 'libqpdf/Pl_LZWDecoder.cc')
| -rw-r--r-- | libqpdf/Pl_LZWDecoder.cc | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/libqpdf/Pl_LZWDecoder.cc b/libqpdf/Pl_LZWDecoder.cc index 2cc2077b..6cc87048 100644 --- a/libqpdf/Pl_LZWDecoder.cc +++ b/libqpdf/Pl_LZWDecoder.cc @@ -2,6 +2,7 @@ #include <qpdf/QTC.hh> #include <qpdf/QUtil.hh> +#include <qpdf/QIntC.hh> #include <stdexcept> #include <string.h> #include <assert.h> @@ -52,22 +53,22 @@ Pl_LZWDecoder::finish() void Pl_LZWDecoder::sendNextCode() { - int high = this->byte_pos; - int med = (this->byte_pos + 1) % 3; - int low = (this->byte_pos + 2) % 3; + unsigned int high = this->byte_pos; + unsigned int med = (this->byte_pos + 1) % 3; + unsigned int low = (this->byte_pos + 2) % 3; - int bits_from_high = 8 - this->bit_pos; - int bits_from_med = this->code_size - bits_from_high; - int bits_from_low = 0; + unsigned int bits_from_high = 8 - this->bit_pos; + unsigned int bits_from_med = this->code_size - bits_from_high; + unsigned int bits_from_low = 0; if (bits_from_med > 8) { bits_from_low = bits_from_med - 8; bits_from_med = 8; } - int high_mask = (1 << bits_from_high) - 1; - int med_mask = 0xff - ((1 << (8 - bits_from_med)) - 1); - int low_mask = 0xff - ((1 << (8 - bits_from_low)) - 1); - int code = 0; + unsigned int high_mask = (1U << bits_from_high) - 1U; + unsigned int med_mask = 0xff - ((1U << (8 - bits_from_med)) - 1U); + unsigned int low_mask = 0xff - ((1U << (8 - bits_from_low)) - 1U); + unsigned int code = 0; code += (this->buf[high] & high_mask) << bits_from_med; code += ((this->buf[med] & med_mask) >> (8 - bits_from_med)); if (bits_from_low) @@ -94,7 +95,7 @@ Pl_LZWDecoder::sendNextCode() } unsigned char -Pl_LZWDecoder::getFirstChar(int code) +Pl_LZWDecoder::getFirstChar(unsigned int code) { unsigned char result = '\0'; if (code < 256) @@ -130,7 +131,7 @@ Pl_LZWDecoder::addToTable(unsigned char next) if (this->last_code < 256) { - tmp[0] = this->last_code; + tmp[0] = static_cast<unsigned char>(this->last_code); last_data = tmp; last_size = 1; } @@ -144,7 +145,7 @@ Pl_LZWDecoder::addToTable(unsigned char next) } Buffer& b = table.at(idx); last_data = b.getBuffer(); - last_size = b.getSize(); + last_size = QIntC::to_uint(b.getSize()); } else { @@ -161,7 +162,7 @@ Pl_LZWDecoder::addToTable(unsigned char next) } void -Pl_LZWDecoder::handleCode(int code) +Pl_LZWDecoder::handleCode(unsigned int code) { if (this->eod) { @@ -189,11 +190,11 @@ Pl_LZWDecoder::handleCode(int code) // be what we read last plus the first character of what // we're reading now. unsigned char next = '\0'; - unsigned int table_size = table.size(); + unsigned int table_size = QIntC::to_uint(table.size()); if (code < 256) { // just read < 256; last time's next was code - next = code; + next = static_cast<unsigned char>(code); } else if (code > 257) { |