diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/compressed_data_extractor.py | 95 |
1 files changed, 86 insertions, 9 deletions
diff --git a/tools/compressed_data_extractor.py b/tools/compressed_data_extractor.py index 9756c02..422e887 100644 --- a/tools/compressed_data_extractor.py +++ b/tools/compressed_data_extractor.py @@ -7,6 +7,8 @@ parser.add_argument('offsets', metavar='offsets', type=str, nargs='+', help='start offset(s) of the compressed data')
parser.add_argument('-s', metavar='suffix', dest='suffix', type=str, nargs=1, default=[],
help='suffix for output file names')
+parser.add_argument('-d', dest='decompress', action='store_true',
+ help='whether the output file should be decompressed')
args = parser.parse_args()
@@ -18,10 +20,6 @@ def getByteString(offset, len): def getByte(offset):
return getByteString(offset, 1)[0]
-def convertOffset(ptrBytes, offset):
- bank = floor(offset / 0x4000)
- return (ptrBytes[0] + (ptrBytes[1] << 8)) + bank * 0x4000 - 0x4000
-
def getFormattedOffset(offset):
return '{:0x}'.format(offset)
@@ -43,9 +41,10 @@ def getCompressedData(offset): cmdByte = getByte(pos)
pos += 1
data.append(cmdByte)
+ print('{:0x}'.format(cmdByte))
- for b in range(8):
- if (cmdByte & (1 << (7 - b)) != 0):
+ for bit in range(8):
+ if (cmdByte & (1 << (7 - bit)) != 0):
# copy one byte literally
data.append(getByte(pos))
pos += 1
@@ -71,13 +70,91 @@ def getCompressedData(offset): # the decompression might finish while still
# reading command bits, so break early when this happens
if (size == 0):
+ if not repeatToggle:
+ # extra bytes to match source
+ data.append(getByte(pos))
+ data.append(getByte(pos + 1))
+
break
return bytes(data)
-def outputData(offset, filename):
+def decompressData(source):
+ buffer = [0x00 for i in range(0x100)]
+ sourcePos = 0
+ bufferPos = 0xef
+ lenByte = 0x00
+ repeatToggle = False
+
+ decompData = [] # final decompressed data that will be output
+
+ while True:
+ if sourcePos >= len(source):
+ # got to the end of the data
+ break
+
+ cmdByte = source[sourcePos]
+ sourcePos += 1
+
+ for cmdBit in range(8):
+ if sourcePos >= len(source):
+ # got to the end of the data
+ break
+
+ if (cmdByte & (1 << (7 - cmdBit)) != 0):
+ # copy one byte literally
+ byteToCopy = source[sourcePos]
+
+ decompData.append(byteToCopy)
+ buffer[bufferPos] = byteToCopy
+ sourcePos += 1
+ bufferPos = (bufferPos + 1) % 0x100
+ else:
+ # copy previous sequence
+ repeatToggle = not repeatToggle
+
+ if (repeatToggle):
+ # sequence length
+ offsetToCopy = source[sourcePos]
+ lenByte = source[sourcePos + 1]
+ bytesToCopy = []
+
+ curLen = (lenByte >> 4) + 2
+ for i in range(curLen):
+ buffer[bufferPos] = buffer[offsetToCopy]
+ bytesToCopy.append(buffer[offsetToCopy])
+ offsetToCopy = (offsetToCopy + 1) % 0x100
+ bufferPos = (bufferPos + 1) % 0x100
+
+ decompData.extend(bytesToCopy)
+ sourcePos += 2
+ else:
+ # no sequence length byte if toggle is off
+ offsetToCopy = source[sourcePos]
+ bytesToCopy = []
+
+ curLen = (lenByte & 0x0f) + 2
+ for i in range(curLen):
+ buffer[bufferPos] = buffer[offsetToCopy]
+ bytesToCopy.append(buffer[offsetToCopy])
+ offsetToCopy = (offsetToCopy + 1) % 0x100
+ bufferPos = (bufferPos + 1) % 0x100
+
+ decompData.extend(bytesToCopy)
+ sourcePos += 1
+
+ return bytes(decompData)
+
+def outputData(offset, filename, decompress):
+ comprData = getCompressedData(offset)
+ data = []
+ if decompress:
+ data = decompressData(comprData)
+ else:
+ data = comprData
+
with open(filename + '.bin', 'wb') as outFile:
- outFile.write(getCompressedData(offset))
+ outFile.write(data)
n = 1
for offsetStr in args.offsets:
@@ -87,5 +164,5 @@ for offsetStr in args.offsets: filename = args.suffix[0]
if (len(args.offsets) > 1):
filename = filename + str(n)
- outputData(offset, filename)
+ outputData(offset, filename, args.decompress)
n += 1
|