Method binExtract

lib/bulk.go:175–196

Data extraction routines

(ctx context.Context, what string, n int)

// Data extraction routines
func (tmplContext *BulkTemplateContext) binExtract(ctx context.Context, what string, n int) (value []byte, success bool) {
	// Catch bogus values of n
	if n < 0 || (tmplContext.BinOffset+n) < 0 {
		logWarn(ctx, "bulk underrun: invalid value of n %d at offset %d", n, tmplContext.BinOffset)
		tmplContext.BinUnderrun = true
	}

	if (tmplContext.BinOffset + n) > tmplContext.BinLen {
		logWarn(ctx, "bulk underrun: want %d at offset %d but record len is only %d", n, tmplContext.BinOffset, tmplContext.BinLen)
		tmplContext.BinUnderrun = true
	}
	if tmplContext.BinUnderrun {
		return
	}
	value = tmplContext.Bin[tmplContext.BinOffset : tmplContext.BinOffset+n]
	if debugJSONBin {
		logDebug(ctx, "binExtract(%s %d:%d): %X\n", what, tmplContext.BinOffset, n, value)
	}
	tmplContext.BinOffset += n
	success = true
	return
}

func (tmplContext *BulkTemplateContext) binExtractInt8(ctx context.Context, what string) (value int8) {
	bin, success := tmplContext.binExtract(ctx, what, 1)