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frodo |
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/* |
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parse_simple.c - Part of psiconv, a PSION 5 file formats converter |
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Copyright (c) 1999 Frodo Looijaard <frodol@dds.nl> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include "config.h" |
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#include <stdlib.h> |
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#include "parse_routines.h" |
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psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off) |
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{ |
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psiconv_u8 *ptr; |
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ptr = psiconv_list_get(buf,off); |
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if (!ptr) |
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psiconv_fatal(lev,off,"Trying byte read past the end of the file"); |
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return *ptr; |
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} |
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psiconv_u16 psiconv_read_u16(const psiconv_buffer buf,int lev,psiconv_u32 off) |
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{ |
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psiconv_u8 *ptr0,*ptr1; |
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ptr0 = psiconv_list_get(buf,off); |
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ptr1 = psiconv_list_get(buf,off+1); |
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if (!ptr0 || !ptr1) |
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psiconv_fatal(lev,off,"Trying word read past the end of the file"); |
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return *ptr0 + (*ptr1 << 8); |
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} |
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psiconv_u32 psiconv_read_u32(const psiconv_buffer buf,int lev,psiconv_u32 off) |
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{ |
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psiconv_u8 *ptr0,*ptr1,*ptr2,*ptr3; |
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ptr0 = psiconv_list_get(buf,off); |
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ptr1 = psiconv_list_get(buf,off+1); |
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ptr2 = psiconv_list_get(buf,off+2); |
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ptr3 = psiconv_list_get(buf,off+3); |
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if (!ptr0 || !ptr1 || !ptr2 || !ptr3) |
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psiconv_fatal(lev,off,"Trying long read past the end of the file"); |
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return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24); |
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} |
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psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off, |
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int *length) |
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{ |
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psiconv_u8 temp; |
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psiconv_S_t res; |
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int len; |
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psiconv_progress(lev+1,off,"Going to read a S length indicator"); |
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temp = psiconv_read_u8(buf,lev+2,off); |
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if ((temp & 0x03) == 0x02) { |
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res = psiconv_read_u8(buf,lev+2,off) >> 2; |
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len = 1; |
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psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res); |
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} else if ((temp & 0x07) == 0x03) { |
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res = psiconv_read_u16(buf,lev+2,off) >> 3; |
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len = 2; |
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psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res); |
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} else { |
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psiconv_warn(lev+2,off,"S indicator: unknown encoding!"); |
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psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp); |
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res = 0; |
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len = 1; |
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} |
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if (length) |
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*length = len; |
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psiconv_progress(lev+1,off+len-1, |
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"End of S length indicator (total length: %08x)", len); |
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return res; |
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} |
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psiconv_X_t psiconv_read_X(const psiconv_buffer buf, int lev, psiconv_u32 off, |
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int *length) |
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{ |
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psiconv_u8 temp; |
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psiconv_X_t res; |
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int len; |
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psiconv_progress(lev+1,off,"Going to read a X length indicator"); |
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temp = psiconv_read_u8(buf,lev+2,off); |
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if ((temp & 0x01) == 0x00) { |
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res = psiconv_read_u8(buf,lev+2,off) >> 1; |
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len = 1; |
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psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res); |
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} else if ((temp & 0x03) == 0x01) { |
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res = psiconv_read_u16(buf,lev+2,off) >> 2; |
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len = 2; |
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psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res); |
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} else if ((temp & 0x07) == 0x03) { |
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res = psiconv_read_u16(buf,lev+2,off) >> 3; |
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len = 4; |
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psiconv_debug(lev+2,off,"Indicator (4 bytes): %08x",res); |
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} else { |
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psiconv_warn(lev+2,off,"X indicator: unknown encoding!"); |
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psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp); |
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res = 0; |
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len = 1; |
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} |
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if (length) |
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*length = len; |
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psiconv_progress(lev+1,off+len-1, |
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"End of X length indicator (total length: %08x)", len); |
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return res; |
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} |
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psiconv_length_t psiconv_read_length(const psiconv_buffer buf, int lev, |
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psiconv_u32 off, int *length) |
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{ |
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psiconv_length_t res; |
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res = (2.54/1440.0) * ((psiconv_s32) psiconv_read_u32(buf,lev,off)); |
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psiconv_debug(lev+1,off,"Length: %f",res); |
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if (length) |
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*length = 4; |
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return res; |
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} |
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psiconv_size_t psiconv_read_size(const psiconv_buffer buf, int lev, |
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psiconv_u32 off, int *length) |
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{ |
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psiconv_size_t res; |
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res = ((psiconv_s32) psiconv_read_u32(buf,lev,off)) / 20.0; |
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psiconv_debug(lev+1,off,"Size: %f",res); |
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if (length) |
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*length = 4; |
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return res; |
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} |
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int psiconv_parse_bool(const psiconv_buffer buf, int lev, psiconv_u32 off, |
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int *length, psiconv_bool_t *result) |
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{ |
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psiconv_u8 temp; |
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temp = psiconv_read_u8(buf,lev,off); |
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if (length) |
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*length = 1; |
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if (temp == 0) { |
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*result = psiconv_bool_false; |
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return 0; |
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} else if (temp == 1) { |
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*result = psiconv_bool_true; |
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return 0; |
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} |
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psiconv_warn(lev+1,off,"Unknown value for boolean"); |
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psiconv_debug(lev+1,off,"Boolean value: %02x",temp); |
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*result = psiconv_bool_true; |
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return -1; |
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} |
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psiconv_string_t psiconv_read_string(const psiconv_buffer buf,int lev, |
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psiconv_u32 off,int *length) |
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{ |
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int stringlen,i,leng,len; |
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psiconv_string_t result; |
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char *res_copy; |
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psiconv_progress(lev+1,off,"Going to read a string"); |
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stringlen = psiconv_read_S(buf,lev+2,off,&leng); |
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psiconv_debug(lev+2,off,"Length: %i",stringlen); |
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len = leng; |
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result = malloc(stringlen + 1); |
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for (i = 0; i < stringlen; i++) |
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result[i] = psiconv_read_u8(buf,lev,off+i+len); |
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result[stringlen] = 0; |
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len += stringlen; |
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res_copy = psiconv_make_printable(result); |
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psiconv_debug(lev+2,off,"Contents: `%s'",res_copy); |
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free(res_copy); |
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if (length) |
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*length = len; |
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psiconv_progress(lev+1,off+len-1,"End of string (total length: %08x)",len); |
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return result; |
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} |