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157 lines
2.7 KiB
157 lines
2.7 KiB
15 years ago
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//========================================================================
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//
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4 years ago
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// FoFiBase.cpp
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15 years ago
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//
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// Copyright 1999-2003 Glyph & Cog, LLC
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//
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//========================================================================
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#include <aconf.h>
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#ifdef USE_GCC_PRAGMAS
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#pragma implementation
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#endif
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#include <stdio.h>
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#include "gmem.h"
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#include "FoFiBase.h"
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//------------------------------------------------------------------------
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// FoFiBase
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//------------------------------------------------------------------------
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FoFiBase::FoFiBase(char *fileA, int lenA, GBool freeFileDataA) {
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fileData = file = (Guchar *)fileA;
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len = lenA;
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freeFileData = freeFileDataA;
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}
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FoFiBase::~FoFiBase() {
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if (freeFileData) {
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gfree(fileData);
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}
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}
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char *FoFiBase::readFile(char *fileName, int *fileLen) {
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FILE *f;
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char *buf;
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int n;
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if (!(f = fopen(fileName, "rb"))) {
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return NULL;
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}
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fseek(f, 0, SEEK_END);
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n = (int)ftell(f);
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fseek(f, 0, SEEK_SET);
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buf = (char *)gmalloc(n);
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if ((int)fread(buf, 1, n, f) != n) {
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gfree(buf);
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fclose(f);
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return NULL;
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}
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fclose(f);
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*fileLen = n;
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return buf;
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}
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int FoFiBase::getS8(int pos, GBool *ok) {
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int x;
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if (pos < 0 || pos >= len) {
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*ok = gFalse;
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return 0;
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}
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x = file[pos];
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if (x & 0x80) {
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x |= ~0xff;
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}
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return x;
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}
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int FoFiBase::getU8(int pos, GBool *ok) {
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if (pos < 0 || pos >= len) {
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*ok = gFalse;
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return 0;
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}
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return file[pos];
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}
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int FoFiBase::getS16BE(int pos, GBool *ok) {
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int x;
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if (pos < 0 || pos+1 >= len) {
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*ok = gFalse;
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return 0;
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}
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x = file[pos];
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x = (x << 8) + file[pos+1];
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if (x & 0x8000) {
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x |= ~0xffff;
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}
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return x;
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}
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int FoFiBase::getU16BE(int pos, GBool *ok) {
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int x;
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if (pos < 0 || pos+1 >= len) {
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*ok = gFalse;
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return 0;
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}
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x = file[pos];
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x = (x << 8) + file[pos+1];
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return x;
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}
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int FoFiBase::getS32BE(int pos, GBool *ok) {
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int x;
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if (pos < 0 || pos+3 >= len) {
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*ok = gFalse;
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return 0;
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}
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x = file[pos];
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x = (x << 8) + file[pos+1];
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x = (x << 8) + file[pos+2];
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x = (x << 8) + file[pos+3];
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if (x & 0x80000000) {
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x |= ~0xffffffff;
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}
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return x;
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}
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Guint FoFiBase::getU32BE(int pos, GBool *ok) {
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Guint x;
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if (pos < 0 || pos+3 >= len) {
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*ok = gFalse;
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return 0;
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}
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x = file[pos];
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x = (x << 8) + file[pos+1];
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x = (x << 8) + file[pos+2];
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x = (x << 8) + file[pos+3];
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return x;
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}
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Guint FoFiBase::getUVarBE(int pos, int size, GBool *ok) {
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Guint x;
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int i;
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if (pos < 0 || pos + size > len) {
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*ok = gFalse;
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return 0;
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}
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x = 0;
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for (i = 0; i < size; ++i) {
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x = (x << 8) + file[pos + i];
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}
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return x;
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}
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GBool FoFiBase::checkRegion(int pos, int size) {
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return pos >= 0 &&
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pos + size >= pos &&
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pos + size <= len;
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}
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