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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "JBig2_HuffmanTable.h"
#include <string.h>
#include "../../../include/fxcrt/fx_memory.h"
#include "JBig2_BitStream.h"
CJBig2_HuffmanTable::CJBig2_HuffmanTable(const JBig2TableLine* pTable,
int nLines,
FX_BOOL bHTOOB) {
init();
m_bOK = parseFromStandardTable(pTable, nLines, bHTOOB);
}
CJBig2_HuffmanTable::CJBig2_HuffmanTable(CJBig2_BitStream* pStream) {
init();
m_bOK = parseFromCodedBuffer(pStream);
}
CJBig2_HuffmanTable::~CJBig2_HuffmanTable() {
FX_Free(CODES);
FX_Free(PREFLEN);
FX_Free(RANGELEN);
FX_Free(RANGELOW);
}
void CJBig2_HuffmanTable::init() {
HTOOB = FALSE;
NTEMP = 0;
CODES = NULL;
PREFLEN = NULL;
RANGELEN = NULL;
RANGELOW = NULL;
}
int CJBig2_HuffmanTable::parseFromStandardTable(const JBig2TableLine* pTable,
int nLines,
FX_BOOL bHTOOB) {
int CURLEN, LENMAX, CURCODE, CURTEMP, i;
int* LENCOUNT;
int* FIRSTCODE;
HTOOB = bHTOOB;
NTEMP = nLines;
CODES = (int*)FX_AllocOrDie(sizeof(int), NTEMP);
PREFLEN = (int*)FX_AllocOrDie(sizeof(int), NTEMP);
RANGELEN = (int*)FX_AllocOrDie(sizeof(int), NTEMP);
RANGELOW = (int*)FX_AllocOrDie(sizeof(int), NTEMP);
LENMAX = 0;
for (i = 0; i < NTEMP; i++) {
PREFLEN[i] = pTable[i].PREFLEN;
RANGELEN[i] = pTable[i].RANDELEN;
RANGELOW[i] = pTable[i].RANGELOW;
if (PREFLEN[i] > LENMAX) {
LENMAX = PREFLEN[i];
}
}
LENCOUNT = (int*)FX_AllocOrDie(sizeof(int), (LENMAX + 1));
JBIG2_memset(LENCOUNT, 0, sizeof(int) * (LENMAX + 1));
FIRSTCODE = (int*)FX_AllocOrDie(sizeof(int), (LENMAX + 1));
for (i = 0; i < NTEMP; i++) {
LENCOUNT[PREFLEN[i]]++;
}
CURLEN = 1;
FIRSTCODE[0] = 0;
LENCOUNT[0] = 0;
while (CURLEN <= LENMAX) {
FIRSTCODE[CURLEN] = (FIRSTCODE[CURLEN - 1] + LENCOUNT[CURLEN - 1]) << 1;
CURCODE = FIRSTCODE[CURLEN];
CURTEMP = 0;
while (CURTEMP < NTEMP) {
if (PREFLEN[CURTEMP] == CURLEN) {
CODES[CURTEMP] = CURCODE;
CURCODE = CURCODE + 1;
}
CURTEMP = CURTEMP + 1;
}
CURLEN = CURLEN + 1;
}
FX_Free(LENCOUNT);
FX_Free(FIRSTCODE);
return 1;
}
#define HT_CHECK_MEMORY_ADJUST \
if (NTEMP >= nSize) { \
nSize += 16; \
PREFLEN = (int*)FX_Realloc(uint8_t, PREFLEN, sizeof(int) * nSize); \
RANGELEN = (int*)FX_Realloc(uint8_t, RANGELEN, sizeof(int) * nSize); \
RANGELOW = (int*)FX_Realloc(uint8_t, RANGELOW, sizeof(int) * nSize); \
}
int CJBig2_HuffmanTable::parseFromCodedBuffer(CJBig2_BitStream* pStream) {
unsigned char HTPS, HTRS;
FX_DWORD HTLOW, HTHIGH;
FX_DWORD CURRANGELOW;
FX_DWORD nSize = 16;
int CURLEN, LENMAX, CURCODE, CURTEMP;
int* LENCOUNT;
int* FIRSTCODE;
unsigned char cTemp;
if (pStream->read1Byte(&cTemp) == -1) {
goto failed;
}
HTOOB = cTemp & 0x01;
HTPS = ((cTemp >> 1) & 0x07) + 1;
HTRS = ((cTemp >> 4) & 0x07) + 1;
if (pStream->readInteger(&HTLOW) == -1 ||
pStream->readInteger(&HTHIGH) == -1 || HTLOW > HTHIGH) {
goto failed;
}
PREFLEN = (int*)FX_AllocOrDie(sizeof(int), nSize);
RANGELEN = (int*)FX_AllocOrDie(sizeof(int), nSize);
RANGELOW = (int*)FX_AllocOrDie(sizeof(int), nSize);
CURRANGELOW = HTLOW;
NTEMP = 0;
do {
HT_CHECK_MEMORY_ADJUST
if ((pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) ||
(pStream->readNBits(HTRS, &RANGELEN[NTEMP]) == -1)) {
goto failed;
}
RANGELOW[NTEMP] = CURRANGELOW;
CURRANGELOW = CURRANGELOW + (1 << RANGELEN[NTEMP]);
NTEMP = NTEMP + 1;
} while (CURRANGELOW < HTHIGH);
HT_CHECK_MEMORY_ADJUST
if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) {
goto failed;
}
RANGELEN[NTEMP] = 32;
RANGELOW[NTEMP] = HTLOW - 1;
NTEMP = NTEMP + 1;
HT_CHECK_MEMORY_ADJUST
if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) {
goto failed;
}
RANGELEN[NTEMP] = 32;
RANGELOW[NTEMP] = HTHIGH;
NTEMP = NTEMP + 1;
if (HTOOB) {
HT_CHECK_MEMORY_ADJUST
if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) {
goto failed;
}
NTEMP = NTEMP + 1;
}
CODES = (int*)FX_AllocOrDie(sizeof(int), NTEMP);
LENMAX = 0;
for (int i = 0; i < NTEMP; i++) {
if (PREFLEN[i] > LENMAX) {
LENMAX = PREFLEN[i];
}
}
LENCOUNT = (int*)FX_AllocOrDie(sizeof(int), (LENMAX + 1));
JBIG2_memset(LENCOUNT, 0, sizeof(int) * (LENMAX + 1));
FIRSTCODE = (int*)FX_AllocOrDie(sizeof(int), (LENMAX + 1));
for (int i = 0; i < NTEMP; i++) {
LENCOUNT[PREFLEN[i]]++;
}
CURLEN = 1;
FIRSTCODE[0] = 0;
LENCOUNT[0] = 0;
while (CURLEN <= LENMAX) {
FIRSTCODE[CURLEN] = (FIRSTCODE[CURLEN - 1] + LENCOUNT[CURLEN - 1]) << 1;
CURCODE = FIRSTCODE[CURLEN];
CURTEMP = 0;
while (CURTEMP < NTEMP) {
if (PREFLEN[CURTEMP] == CURLEN) {
CODES[CURTEMP] = CURCODE;
CURCODE = CURCODE + 1;
}
CURTEMP = CURTEMP + 1;
}
CURLEN = CURLEN + 1;
}
FX_Free(LENCOUNT);
FX_Free(FIRSTCODE);
return TRUE;
failed:
return FALSE;
}
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