/* This file is part of REWise. * * REWise is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * REWise is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include "reader.h" REWError readBytesInto(FILE * fp, unsigned char * dest, uint32_t size) { int ch; uint32_t chNo = 0; do { ch = fgetc(fp); dest[chNo] = (unsigned char)ch; chNo++; } while (ch != EOF && size != chNo); if (ch == EOF) { return REWERR_EOF; } return REWERR_OK; } REWError readInt32(FILE * fp, int * dest) { unsigned char buff[4]; REWError status; // read 4 bytes into the buffer status = readBytesInto(fp, buff, 4); // failed to read 4 bytes into the buffer if (status != REWERR_OK) { return status; } *dest = *(int*)buff; return REWERR_OK; } REWError readUInt32(FILE * fp, unsigned int * dest) { unsigned char buff[4]; REWError status; // read 4 bytes into the buffer status = readBytesInto(fp, buff, 4); // failed to read 4 bytes into the buffer if (status != REWERR_OK) { return status; } *dest = *(unsigned int*)buff; return REWERR_OK; } REWError readUInt16(FILE * fp, uint16_t * dest) { REWError status; unsigned char buff[2]; // read 2 bytes into the buffer status = readBytesInto(fp, buff, 2); // failed to read 2 bytes into the buffer if (status != REWERR_OK) { return status; } *dest = buff[0] + (buff[1] << 8); return REWERR_OK; } // This will allocate a new string which need to be freed REWERR_OK is returned REWError readString(FILE * fp, char ** dest) { char * string = NULL; uint32_t stringLength = 0; int ch; uint32_t chNo; long startOffset = ftell(fp); // determine string length do { ch = fgetc(fp); if (ch == EOF) { return REWERR_EOF; } stringLength++; } while (ch != 0x00); if (ch == EOF) { return REWERR_EOF; } // empty string if (stringLength <= 1) { return REWERR_OK; } // allocate string string = malloc(sizeof(char) * stringLength + 1); if (string == NULL) { return REWERR_ERRNO; // failed to allocate mem } string[stringLength] = 0x00; // read the string to the new allocated space fseek(fp, startOffset, SEEK_SET); chNo = 0; do { ch = fgetc(fp); string[chNo] = (char)ch; chNo++; } while (ch != 0x00); *dest = string; return REWERR_OK; }