diff options
Diffstat (limited to 'converter/pbm/pbmtoppa/pbm.c')
| -rw-r--r-- | converter/pbm/pbmtoppa/pbm.c | 273 |
1 files changed, 166 insertions, 107 deletions
diff --git a/converter/pbm/pbmtoppa/pbm.c b/converter/pbm/pbmtoppa/pbm.c index 2f8a42b1..ae36e0d2 100644 --- a/converter/pbm/pbmtoppa/pbm.c +++ b/converter/pbm/pbmtoppa/pbm.c @@ -11,126 +11,185 @@ #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <limits.h> +#include "pm.h" +#include "nstring.h" #include "ppapbm.h" -int make_pbm_stat(pbm_stat* pbm,FILE* fptr) -{ - char line[1024]; - - pbm->fptr=fptr; - pbm->version=none; - pbm->current_line=0; - pbm->unread = 0; +int +make_pbm_stat(pbm_stat * const pbmStatP, + FILE * const ifP) { + + char line[1024]; + char * rc; + int retval; + + pbmStatP->fptr = ifP; + pbmStatP->version = none; + pbmStatP->current_line = 0; + pbmStatP->unread = 0; + + rc = fgets(line, 1024, ifP); + if (rc == NULL) + retval = 0; + else { + line[strlen(line)-1] = 0; + + if (streq(line,"P1")) + pbmStatP->version=P1; + if (streq(line,"P4")) + pbmStatP->version=P4; + + if (pbmStatP->version == none) { + pm_message("unknown PBM magic '%s'", line); + retval = 0; + } else { + do { + char * rc; + rc = fgets(line, 1024, ifP); + if (rc == NULL) + return 0; + } while (line[0] == '#'); + { + int rc; + rc = sscanf(line, "%d %d", + &pbmStatP->width, &pbmStatP->height); + if (rc != 2) + retval = 0; + else { + if (pbmStatP->width < 0) { + pm_message("Image has negative width"); + retval = 0; + } else if (pbmStatP->width > INT_MAX/2) { + pm_message("Uncomputeably large width: %d", + pbmStatP->width); + retval = 0; + } else if (pbmStatP->height < 0) { + pm_message("Image has negative height"); + retval = 0; + } else if (pbmStatP->height > INT_MAX/2) { + pm_message("Uncomputeably large height: %d", + pbmStatP->height); + retval = 0; + } else + retval = 1; + } + } + } + } + return retval; +} - if (fgets (line, 1024, fptr) == NULL) - return 0; - line[strlen(line)-1] = 0; - if(!strcmp(line,"P1")) pbm->version=P1; - if(!strcmp(line,"P4")) pbm->version=P4; - if(pbm->version == none) - { - fprintf(stderr,"pbm_readheader(): unknown PBM magic '%s'\n",line); - return 0; - } - do - if (fgets (line, 1024, fptr) == NULL) - return 0; - while (line[0] == '#'); +static int +getbytes(FILE * const ifP, + unsigned int const width, + unsigned char * const data) { + + unsigned char mask; + unsigned char acc; + unsigned char * place; + unsigned int num; + int retval; + + if (width == 0) + retval = 0; + else { + for (mask = 0x80, acc = 0, num = 0, place = data; num < width; ) { + switch (getc(ifP)) { + case EOF: + return 0; + case '1': + acc |= mask; + /* fall through */ + case '0': + mask >>= 1; + ++num; + if (mask == 0x00) { /* if (num % 8 == 0) */ + *place++ = acc; + acc = 0; + mask = 0x80; + } + } + } + if (width % 8 != 0) + *place = acc; + + retval = 1; + } + return retval; +} - if (2 != sscanf (line, "%d %d", &pbm->width, &pbm->height)) - return 0; - return 1; -} -static int getbytes(FILE *fptr,int width,unsigned char* data) -{ - unsigned char mask,acc,*place; - int num; - - if(!width) return 0; - for(mask=0x80, acc=0, num=0, place=data; num<width; ) - { - switch(getc(fptr)) - { - case EOF: - return 0; - case '1': - acc|=mask; - /* fall through */ - case '0': - mask>>=1; - num++; - if(!mask) /* if(num%8 == 0) */ - { - *place++ = acc; - acc=0; - mask=0x80; - } +int +pbm_readline(pbm_stat * const pbmStatP, + unsigned char * const data) { +/*---------------------------------------------------------------------------- + Read a single line into data which must be at least (pbmStatP->width+7)/8 + bytes of storage. +-----------------------------------------------------------------------------*/ + int retval; + + if (pbmStatP->current_line >= pbmStatP->height) + retval = 0; + else { + if (pbmStatP->unread) { + memcpy(data, pbmStatP->revdata, (pbmStatP->width+7)/8); + ++pbmStatP->current_line; + pbmStatP->unread = 0; + free(pbmStatP->revdata); + pbmStatP->revdata = NULL; + retval = 1; + } else { + switch (pbmStatP->version) { + case P1: + if (getbytes(pbmStatP->fptr, pbmStatP->width, data)) { + pbmStatP->current_line++; + retval = 1; + } else + retval = 0; + break; + case P4: { + int tmp, tmp2; + tmp = (pbmStatP->width+7)/8; + tmp2 = fread(data,1,tmp,pbmStatP->fptr); + if (tmp2 == tmp) { + ++pbmStatP->current_line; + retval = 1; + } else { + pm_message("error reading line data (%d)", tmp2); + retval = 0; + } + } break; + + default: + pm_message("unknown PBM version"); + retval = 0; + } + } } - } - if(width%8) - *place=acc; - return 1; + return retval; } -/* Reads a single line into data which must be at least (pbm->width+7)/8 - bytes of storage */ -int pbm_readline(pbm_stat* pbm,unsigned char* data) -{ - int tmp,tmp2; - - if(pbm->current_line >= pbm->height) return 0; - - if (pbm->unread) - { - memcpy (data, pbm->revdata, (pbm->width+7)/8); - pbm->current_line++; - pbm->unread = 0; - free (pbm->revdata); - pbm->revdata = NULL; - return 1; - } - switch(pbm->version) - { - case P1: - if(getbytes(pbm->fptr,pbm->width,data)) - { - pbm->current_line++; - return 1; - } - return 0; - - case P4: - tmp=(pbm->width+7)/8; - tmp2=fread(data,1,tmp,pbm->fptr); - if(tmp2 == tmp) - { - pbm->current_line++; - return 1; - } - fprintf(stderr,"pbm_readline(): error reading line data (%d)\n",tmp2); - return 0; - default: - fprintf(stderr,"pbm_readline(): unknown PBM version\n"); - return 0; - } -} +void +pbm_unreadline(pbm_stat * const pbmStatP, + void * const data) { +/*---------------------------------------------------------------------------- + Push a line back into the buffer; we read too much! +-----------------------------------------------------------------------------*/ + /* can store only one line in the unread buffer */ -/* push a line back into the buffer; we read too much! */ -void pbm_unreadline (pbm_stat *pbm, void *data) -{ - /* can only store one line in the unread buffer */ - if (pbm->unread) - return; - - pbm->unread = 1; - pbm->revdata = malloc ((pbm->width+7)/8); - memcpy (pbm->revdata, data, (pbm->width+7)/8); - pbm->current_line--; + if (!pbmStatP->unread) { + pbmStatP->unread = 1; + pbmStatP->revdata = malloc ((pbmStatP->width+7)/8); + memcpy(pbmStatP->revdata, data, (pbmStatP->width+7)/8); + --pbmStatP->current_line; + } } + + |