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improve PRS disassembly output

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This commit is contained in:
Martin Michelsen
2024-04-17 00:37:30 -07:00
parent 1870273f89
commit f01882db39
1 changed files with 25 additions and 18 deletions
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src/Compression.cc
+25 -18
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@@ -1015,41 +1015,48 @@ void prs_disassemble(FILE* stream, const void* data, size_t size) {
ControlStreamReader cr(r);
while (!r.eof()) {
uint8_t buffered_bits = cr.buffered_bits();
if (cr.read()) {
fprintf(stream, "[%zX] literal %02hhX\n", output_bytes, r.get_u8());
uint8_t literal_value = r.get_u8();
fprintf(stream, "[%zX] %hhu> 1 %02hhX literal %02hhX\n",
output_bytes, buffered_bits, literal_value, literal_value);
output_bytes++;
} else {
ssize_t offset;
size_t count;
const char* copy_type;
size_t count, read_offset;
if (cr.read()) {
uint16_t a = r.get_u8();
a |= (r.get_u8() << 8);
offset = (a >> 3) | (~0x1FFF);
uint8_t a_low = r.get_u8();
uint8_t a_high = r.get_u8();
uint16_t a = (a_high << 8) | a_low;
ssize_t offset = (a >> 3) | (~0x1FFF);
if (offset == ~0x1FFF) {
fprintf(stream, "[%zX] end\n", output_bytes);
break;
}
if (a & 7) {
copy_type = "long";
count = (a & 7) + 2;
read_offset = output_bytes + offset;
fprintf(stream, "[%zX] %hhu> 01 %02hhX %02hhX long copy from %zd (offset=%zX) size=%zX\n",
output_bytes, buffered_bits, a_low, a_high, offset, read_offset, count);
} else {
copy_type = "extended";
count = r.get_u8() + 1;
uint8_t count_u8 = r.get_u8();
count = count_u8 + 1;
read_offset = output_bytes + offset;
fprintf(stream, "[%zX] %hhu> 01 %02hhX %02hhX %02hhX extended copy from %zd (offset=%zX) size=%zX\n",
output_bytes, buffered_bits, a_low, a_high, count_u8, offset, read_offset, count);
}
} else {
copy_type = "short";
count = cr.read() << 1;
count = (count | cr.read()) + 2;
offset = r.get_u8() | (~0xFF);
bool first_bit = cr.read();
bool second_bit = cr.read();
uint8_t offset_u8 = r.get_u8();
count = ((first_bit ? 2 : 0) | (second_bit ? 1 : 0)) + 2;
ssize_t offset = offset_u8 | (~0xFF);
read_offset = output_bytes + offset;
fprintf(stream, "[%zX] %hhu> 00%c%c %02hhX short copy from %zd (offset=%zX) size=%zX\n",
output_bytes, buffered_bits, first_bit ? '1' : '0', second_bit ? '1' : '0', offset_u8, offset, read_offset, count);
}
size_t read_offset = output_bytes + offset;
fprintf(stream, "[%zX] %s copy %zX\n", output_bytes, copy_type, count);
if (read_offset >= output_bytes) {
throw runtime_error("backreference offset beyond beginning of output");
}