ref: b3610440c27ad0b930290179daf1f18d5a675686
dir: /filter.c/
#include <u.h> #include <libc.h> #include "pdf.h" /* 7.4 Filters */ extern Filter filterASCII85; extern Filter filterASCIIHex; extern Filter filterCCITTFax; extern Filter filterCrypt; extern Filter filterDCT; extern Filter filterFlate; extern Filter filterJBIG2; extern Filter filterJPX; extern Filter filterLZW; extern Filter filterRunLength; static Filter *filters[] = { &filterASCII85, &filterASCIIHex, &filterCCITTFax, &filterCrypt, &filterDCT, &filterFlate, &filterJBIG2, &filterJPX, &filterLZW, &filterRunLength, }; Filter * filteropen(char *name, Object *o) { int i; Filter *f; for(i = 0; i < nelem(filters) && strcmp(filters[i]->name, name) != 0; i++); if(i >= nelem(filters)){ werrstr("no such filter %q", name); return nil; } if(filters[i]->readall == nil){ werrstr("filter %q not implemented", name); return nil; } if((f = malloc(sizeof(*f))) == nil) return nil; memmove(f, filters[i], sizeof(*f)); if(f->open != nil && f->open(f, o) != 0){ free(f); return nil; } return f; } int filterrun(Filter *f, Buffer *bi, Buffer *bo) { if(f->readall(f->aux, bi, bo) != 0){ werrstr("filter[%s]: %r", f->name); return -1; } return 0; } void filterclose(Filter *f) { if(f->close != nil) f->close(f); free(f); }