diff options
| -rw-r--r-- | src/pj_gridinfo.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/src/pj_gridinfo.c b/src/pj_gridinfo.c index 9a8b3dd5..0f90d655 100644 --- a/src/pj_gridinfo.c +++ b/src/pj_gridinfo.c @@ -851,6 +851,7 @@ PJ_GRIDINFO *pj_gridinfo_init( projCtx ctx, const char *gridname ) PJ_GRIDINFO *gilist; PAFile fp; char header[160]; + size_t header_size = 0; errno = pj_errno = 0; ctx->last_errno = 0; @@ -897,10 +898,14 @@ PJ_GRIDINFO *pj_gridinfo_init( projCtx ctx, const char *gridname ) /* -------------------------------------------------------------------- */ /* Load a header, to determine the file type. */ /* -------------------------------------------------------------------- */ - if( pj_ctx_fread( ctx, header, sizeof(header), 1, fp ) != 1 ) + if( (header_size = pj_ctx_fread( ctx, header, 1, + sizeof(header), fp ) ) != sizeof(header) ) { /* some files may be smaller that sizeof(header), eg 160, so */ ctx->last_errno = 0; /* don't treat as a persistent error */ + pj_log( ctx, PJ_LOG_DEBUG_MAJOR, + "pj_gridinfo_init: short header read of %d bytes", + (int)header_size ); } pj_ctx_fseek( ctx, fp, SEEK_SET, 0 ); @@ -908,14 +913,16 @@ PJ_GRIDINFO *pj_gridinfo_init( projCtx ctx, const char *gridname ) /* -------------------------------------------------------------------- */ /* Determine file type. */ /* -------------------------------------------------------------------- */ - if( strncmp(header + 0, "HEADER", 6) == 0 + if( header_size >= 144 + 16 + && strncmp(header + 0, "HEADER", 6) == 0 && strncmp(header + 96, "W GRID", 6) == 0 && strncmp(header + 144, "TO NAD83 ", 16) == 0 ) { pj_gridinfo_init_ntv1( ctx, fp, gilist ); } - else if( strncmp(header + 0, "NUM_OREC", 8) == 0 + else if( header_size >= 48 + 7 + && strncmp(header + 0, "NUM_OREC", 8) == 0 && strncmp(header + 48, "GS_TYPE", 7) == 0 ) { pj_gridinfo_init_ntv2( ctx, fp, gilist ); @@ -928,7 +935,7 @@ PJ_GRIDINFO *pj_gridinfo_init( projCtx ctx, const char *gridname ) pj_gridinfo_init_gtx( ctx, fp, gilist ); } - else if( strncmp(header + 0,"CTABLE V2",9) == 0 ) + else if( header_size >= 9 && strncmp(header + 0,"CTABLE V2",9) == 0 ) { struct CTABLE *ct = nad_ctable2_init( ctx, fp ); |